Document QX4wnqMRyMmn6O9z5qdvVrBvE

r' UNION CARBIDE VINYL CHLORIDE MONOMER -f^^OZ^O CHEMICALS COMPANY .^)T,E C H N I C A LV4 NFORMATION .9 .1 * c is C i Ic i l VINYL CHLORIDE MONOMER .iT i\AL-^ Ot' CH-= CHCI 10 70\'3 GENERAL DESCRIPTION Vinyl chloride in colorlesn gan at ntandard temperature and pr< __________ lightly nweet odor. The monomer in readily polymerized in the preeeace of peroxide type catalyatn to form uaeful bomopolyinera and copolymem. In the abnance of active catalynta the material in quite ntable and in ordinarily chipped without an inhibitor. If an inhibitor in deaired, 50 to 150 ppm. of phenol in generally uaed. O R ID E M O N O M E R Si I Ji Vi 1o i lS i fl il PHYSICAL PROPERTIES Molecular Weight................................................... 62.50 Apparent Specific Gravity at 20/20C.................... 0.9121 Asp. gr. /At-...... ............. ................... -......... 0.00186 per C. Boiling Point at 760 mm. Hg.................................. -13.4C. 50 mm. Hg.................................. -63C. 10 mm. Hg... -...................-....... -84C. Ab.p./Ap..................... 0.026C./mm. Hg Vapor Pressure at 20C......................................... 2520 mm. Hg Coefficient of Expansion at 20C. ........................ 0.00203 Freezing Point................................................. . -153.8C. Solubility in Water at 20C. ................................. 0.68% by weight Solubility of Water in at 20C................................. 0.09% by weight Refractive Index, nD at 20C. ......... .................... 1.37 An0/At.......................................... .................... 0.00080 Specific Heat at 20C. ....... ........-....................... 0.211 cal./g./C. Heat of Vaporization at 1 atm....................... ......... 153 b.Lu./lb. Heat of Polymerization......................................... 272 cal/g. (490 b.Lu./lb.) Flash Point (open cup).......................-................ <0F. Explosive Limits in Air......................................... 4 to 22% by volume SHIPPING DATA Pounds per Gal. 20C. ..................... ....... .................... ......... 60F.................................. ............................. Net Container Contents Cylinder Z________ ____________ ...... -..................... T (above 1198)... ............. ...... ...... ............. Labels Required............ -................. ................... Cylinder Color Scheme Top.... .............................. ............................. Bottom................ ............... 7.59 7.66 151b. 150 1b. Red Gas green ucc 049420 January, 1962 F-40540 VINYL. CHLORIDE MONOMER SUSPENSION POLYMERIZATION OF VINYL CHORIDE General Conditions Reaction Temperature .............. ..................................... ....... Pressure.................................................... ......................... Agitator Speed......................................... ........................... Monomer Conversion........................ ........ .................... ....... 40 to 60C. 75 to 125 psii 75 to 150 r.p.m. 80 to 95 per cent General Recipes Monomer to Water Ratio............ ........ .........._........ . Suspending Agent (either (a) or (b) or both) (a) Colloid (CELLOSIZE WP-09, "Methoceir/1) or polyvinyl alcohol)...................................... (b) Surfactant (TERGITOL 4 or 08, sodium lauryl sulfate, or '`Aerosol" MA(J) .................................... )ZIICatalyst (Benzoyl peroxide or diacetyl peroxide, etc. Water.......................................... ....................... . 30/70 to 50/50 .05 to .15% of monomer .05 to .15% of monomer 0.1 to 0.3% of monomer Deionized and Deaerated (J) ten Cbtmicel Gan&my (2) American Cymtrmd Company Comments 1. The same general conditions and recipiea . apply to copolymers with vinyl acetate and other monomers. The amount of comonomer that will react depends on the reactivity rela tive to vinyl chloride. About 25 per cent vinyl acetate is a practical limit. 2. The type and quality of resin produced is markedly affected by Ganges in conditions and formula ingredients. This can be minimixed by adhering strictly to the same con ditions in each reactant hatch. Temperature, agitation, monomer conversion, and ingredi ents must be csrefnlly cootrolled. 3. Resins for different end-uses require varied properties. These changes in properties can be attained by changes in the reaction conditions and formula ingredients. Bow to make these changes can only be developed through experience with a given production unit. 4. In preparing a suspension resin, add enough suspending agent to prevent coagula tion of the resin during reaction and to control particle size within the desired range, but not enough to stabilize so that recovery of the resin is impeded. This is accomplished by balancing the agitation speed and concentra tions of suspending agent and surfactant. References "Vinyl Resins" - Smith (Reinhold Publishing) "Vinyl and Related Polymers" -- Schiliknecht U.S.P.2,492,087 to Monsanto Chemical Company, 1949 ll.S.P.2,492,089 to Monsanto Chemical Company, 1949 U.S.P.2,245,743 to B.F. Goodrich, 1941 Page 2 ucc 049421 VINYL CHLORIDE MONOMER Reactivity of Monomers Relative to Vinyl Chloride Vinyl Chloride Methyl Methacrylate Styrene Methacrylonitrile Methyl Vinyl Sulfone Vinylidene Chloride Acrylonitrile 1.0 20 IS 15 15 9 5 Methalkyl Chloride Methyl Acrylate Allyl Acetate Allyl Chloride Vinyl Acetate Isopropenyl Acetate Vinyl Ethyl Ether 2.3 2 0.5 0.4 0.3 0.3 0.1 STORAGE AND HANDLING Inhibited vinyl diloride monomer may be atored at normal atmospheric temperatures in ateel pressure veaaela. Uninhibited monomer may be atored either under refrigeration or at normal atmospheric tempersturea in the ab sence of air, sunlight or other catalysts for relatively abort periods of time. All tanks, piping, instrument leads, relief valves and equipment in contact with the monomer should be of steel and designed to have a working pressure of at least 138 pai. No copper or copper bearing alloys afaonld be used in the storage facilities in contact with the monomer or its vapors. Cast iron is not recommended for use in flanges or fittings. All liquid inlet lines should enter the bot tom of the tanks or extend to the bottom of the tanks to prevent the accumulation of static charges on filling. In addition all tanks and filling equipment should be pounded. The tanka should be equipped with a com bination of a 138 pai frangible disk and pres sure relief valve. In case excess pressure ruptures the safety disk, the pressure relief valve will prevent the loss of the entire con tents of the tank after the excess pressure has been relieved. These tanka are designed for sldn temperatures up to approximately 130F. In localities where surface tempera tures may go above this value, the tanks may be cooled with a water spray system. The tanks should not be filled to more than 90% of volume capacity. A blanket of inert gas or vinyl chloride vapor must be maintained in the tank at all times. No air should be allowed to enter the tanka at any time. Relief valve sixes may be determined by using A.S.M.E. Boiler Construction Code VA230 when the valve is designed to relieve all vapor formed without increasing the total pressure by more than 10%. Tanks may be gauged with nitrogen bubbler gauges. Adequate diking and drainage should be provided under the tanks to confine and dis pose of the liquid in case of vessel rupture. A water spray system ta recommended as a method of keeping the metal tank cool in case of fire. All outlet lines from storage tanks should contain check valves to prevent contamination of tank contents. Before a tank is put into vinyl chloride monomer service, it should be purged with an inert gas until free of air. Tanka of less than 30,000 gallons capacity are most economically constructed in the form of horizontal cylinders. For detailed information on the storage and handling of vinyl chloride consult Manufac turing Chemists* Chemical Data Sheet SD-56. Tikis bulletin mentions the following points as being necessary for safe handling. 1. Keep away from heat, sparks and open flame. 2. Provide adequate ventilation. Page 3 ucc 049422 VINYL CHLORIDE MONOMER 3. Ground equipment and containers before discharging. to reduce danger of ignition from static sparks. 4. In discharging do not heat containers above 50C. (122F.). No heat should be applied to tank cars. 5. All equipment should be of steel and have a designed working pressure of at least 100-150 pai. 6. In the event of accidental leaks, spills, or whenever excessive vapor concentrations may be encountered, only personnel equip ped with approved respiratory protection should be permitted in tbe contaminated area. 7. Chemical safety goggles should be worn when discharging containers or tank cars or whenever there is a danger of the liquid or saturated vapor coming in contact with the eyes. 8. Waste disposal should be away from any source of ignition. Dilute phenolic residues before discharging to sewer. In case of fire use carbon dioxide or dry chemical extinguishing equipment. In the event of contact with tbe liquid remove con taminated clothing immediately. For eyes flush immediately with large quantities of water for at least 15 minutes while medical attention is being sought. TOXICOLOGICAL PROPERTIES Practical observations indicate that breath ing vinyl chloride vapors presents the greatest hazard. Because of the high vapor pressure of vinyl chloride, high vapor concentrations develop rapidly. These vapors have a typical aneathetic effect, first causing dizzineus, weakness, mental confusion, and finally loss of consciousness. Removal from exposure brings shoot rapid recovery with only brief complaints of nausea and headache. High volatility makes prolonged skin con tact with the material improbable. However, contact with saturated clothing may cause skin irritation. There is some suggestion that skin penetration occurs and that the response given is an anesthetic one. Injury to the eye would be similar to that caused by contact with liquid band soaps. Eye protection is advisable, and in case of accidental contact wash the eye with clean water for fifteen minutes. SPECIFICATION LIMITS 1. Acidity as Hydrochloric Acid............--..... 5 ppm., aax. 2. Acetylene----------- --------- -------.............. 2 ppm., max. 3. Aldehydes as Acetaldehyda......................... 4 ppm., mu, 4. Iron as Fe ~TM-------- -------------------------- 0.4 ppm., max. 5. Phenol (Customer's Preference) Inhibited monomer-------------------------- -- 50 to 150 ppm. Uninhibited monomer--------------------------- 2 ppm., mu. 6. Ethylene-------------------------------------------- 10 ppm., mu. 7. Methyl Chloride------------------------------------ 10 ppm., mu. 8. Water------------------------------------------- --- 0.03* by wt.f mu. 9. Nonvolatile matter------------------------------ -- 0.01* by wt., max. 10. Color, Pt-Co__________________________ 20, mu. 11. Appearance-------------------------------------- -- Clear, free of suspended matter. Page 4 ucc 049423 VINYL CHLORIDE MONOMER TEST METHODS 1. ACIDITY ) Solvent mixture Transfer 25 ml. of an hydrous methanol to glass-stoppered 500-ml. volumetric flask containing approximately 250 ml. of ethylene dichloride and 15 ml. of a 0.1 per cent solution of thymol blue indicator in methanol. Dilute to the marie with ad ditional ethylene dichloride,. stopper, and mix thoroughly. b) Procedure Introduce 100 ml. of the sol vent mixture into each of two 500-ml. glaas-atoppered Erlenmeyer flasks by means of a suitable transfer graduate. c) Chill the solutions to approximately --10C. in a suitable cold bath. d) Neutralise each solution with standard 0.005 N alcoholic potassium hydroxide to an orange end point. e) Reserve one of the flasks as a blank. f) Into the other flask introduce 100 ml. of the chilled sample by means of a suit able ekilled transfer graduate. Insert a small piece of paper between the stop per and flask to prevent build-up of pressure and swirl the contents of the flask gently. g) Remove the stopper and, using a 10-raI. buret, titrate with the standard 0.005 N potassium hydroxide to the same color as that of the blank, paragraph e. h) Caluclation A x 1.82 acidity, ppm, an hydrochloric acid A * ml. of 0.005 normal KOH required for the titration 2. ACETYLENE a) Erlenmeyer flask, 250-ml., specially prep wed Fit with a one-hole rubber stopper. Insert a 3-ineh length of glass tubing into the hole and through the stopper so that approximately one-half of it extends above the top of the stopper. Attach 1.5 ft. of rubber tnbing to the glass outlet tube. b) Gas scrubbing bottle Fit a widemouth pint bottle with a two-hole rubber stop per. Into one hole fit a fritted cylinder gas dispersion tube so that it extends to within 1/4 inch of the bottom of the bottle; into the second hole insert a short piece of glass tubing. c) Itsovay's eolation -- stock solutions Solution "A": Prepare by mixing the following: 200 ml. of 10% cupric nitrate, CuNOs 3HjO; 80 ml. of 20% ammonium hydroxide, NH4OH (710 ml, of c.p, re agent grade NH4OH to 1000 ml.); 200 ml. of refined isopropanol, 91%; and 580 ml.of distilled water. Solution "B": 15 per cent by weight hydroxylamine hydrochloride Solution "C": 1.0 per cent by weight gelatin (Eastman Calfskin) d) Procedure CAUTION! Conduct the reaction part of the procedure under a suitable fume hood. Transfer 110 ml. of Solution "A", 40 ml. of Solution "B", and 10 ml. of Solution **C" to each of the following containers: the gas scrubbing bottle and a 250-ml. glass-stoppered Erleameyer flask. e) Reserve the solution in the flask as a blank, f) Chill the specially prepared 250-ml. Erlenmeyer flask, paragraph a, and in troduce 100 ml. of the chilled sample by means of a chilled 100-ml transfer graduate. Hake this transfer as quickly as possible. g) Stopper the flask with the stopper that is connected to the inlet tube of the gas scrubbing bottle by mease of the rub ber tubing. b) Allow all of the sample to evaporate through the gas scrubbing bottle. Page 5 ucc 049424 VINYL CHLORIDE MONOMER i) Transfer a portion of the aaraple and blank solutions to tbe respective 20-nun. cells of a Beckman Model B spectrophotometer and determine tbe absorbance of tbe sample solution at a wavelength of 540 millimicrons based on a reading of 0 for tbe blank. For a complete description of tbe instrument and its operation refer to Beckman Bulletin 206-B. j; From tbe previously prepared calibration curve, paragraph m, read the ppm. of acetylene corresponding to tbe absorb ance of tbe sample at 540 millimicrons. Duplicate determinations must agree within 1 ppm. k) Calibration curve Prepare a aeries of acetylene standards from 1 to 6 ppm., inclusive, by adding known amounts of acetylene to acetylene-free vinyl chloride. l) Determine the absorbance for each of tbe synthetics by following tbe pro cedure given in paragraphs d to i, inclusive. m) Plot a calibration curve of absorbance versus ppm. acetylene using tbe values obtained in paragraph 1, 3. ALDEHYDES a) Fuchsia reagent Weigh 0.500 g. of Fuchsia reagent (rosanilia - hydro chloride) in a small weighing dish and transfer to a 1000-ml. volumetric flask containing 490 ml. of distilled water. Add 11 ml. of a saturated (at 25 C.) solution of snlfur dioxide in distilled water. Stopper the flask, mix well, and allow to stand overnight. At tbe and of this period dilute tbe contents of tbe flask to As mark with distilled water. Add approximately ana g. of powdered activated carbon and mix until the solution is decolorised. Filter As solution by gravity to remove As activated carbon. The reagent should be clear and have no mors than a trace amount of pink color. Page 6 b) Standard aldehyde solution Accurately weigh 1.386 g. at acetaldehyde-ammo nia (Eastman Catalogue No. 560-T) in a small weighing dish and transfer to a 100-mi. volumetric flaak containing 50 ml. of distilled water. By means of a buret add 22.7 ml. of standard 1.0 N or 45.4 ml. of 0.5 N sulfuric acid, dilute to the mark with distilled water, and mix thoroughly. Allow the solution to stand overnight. Before use, verify Ae presence of acetaldehyde odor in Ae solution. This solution should be prepared fresh each time a new cali bration curve is prepared, e) Purity of primary standard Tbe purity of Ae primary standard should be determined each time a new standard aldehyde solution ia prepared. Using a weighing diah, introduce 0.6 to 0.8 g. of the Eastman acetaldehyde-ammonia weighed to Ae nearest 0.1 mg. into each of two 500-ml. glass-stoppered Erlenmeyer flasks contsining 50 ml. of distilled water and swirl to effect solution. Add 50 ml. of distilled water to a Aird flask and reserve as a blank. Pipet two ml. of 0.04 per cent solution of bromophenol blue indicator in metha nol into each sample and blank flask and carefully neutralise Ae contents to Ae indicator wiA standard 0.5 N aqueous hydrochloric acid. Add ex actly 5.0 ml. of Ae 0.5 N acid in ex cess. Pipet 50 ml. of 0.5 N aqueous hydroxylamine hydrochloride reagent into each flask and allow Ae flasks to stand at room temperature for 60 min utes. Titrate Ae contents of each flask to a grayish-blue end point with stand ard 0.5 N aqueous sodium hydroxide. Calculation: (A-B)Nx 6.108 _ g. acetaldehyde-ammonia " acetaldehyde-ammonia, % by weight A m ml. at N normal NaOH required for Ae asmple. ucc 049425 VINYL CHLORIDE MONOMER B ml. of N normal NnOH required for the blank. d) Procedure Aaeemble the appnratoa na bown in Figure 1. NOTE: All equip ment ueed in tbe performance of thin teat muat be cleaned with dichromate cleaning solution, rinsed with water, then methanol, and air-dried. Tbe teat must be performed under a flame-free fume bood and in an aldehyde-free room. e) Transfer 12 ml. of distilled water to each of sir impingers. Insert tbe impinger tubes and place in beakers of wet ice an abown in Figure 1, Connect tbe rubber tabiag between tbe impingers in such a manner an to have two series of three impingera. f) Using a graduate that ban been previoualy chilled with solid carbon dioxide, introduce 100 ml. (100 g.) of the sample into each of two previously chilled 125-ml. flanks. g) Connect the sample flanks to respective series of three impinger tubes. Place a small piece of cork or wood under each flask and allow the anmple to evaporate to dryness. h) When tbe samples have evaporated com pletely, disconnect the rubber tubing, and remove tbe impinger tubes. Allow tbe tubes to drain by touching the tips against tbe insides of the respective impingers. i) Prepare n blank for the reagent by add ing 20 ml. of distilled water to a 25-mi. glass-stoppered graduate. j) Pipet 5 ml. of the Fnchain reagent into the blank. Stopper the container, mix thoroughly, and place in a water bath maintained at 25 0.5C. for 35 t 2 minutes. k) Repeat step j with each sample im pinger, diluting it to 25 ml. with dis tilled water after the addition of Fuch sia reagent. Stopper, mix, and place each container in the water bath, noting its starting time, before adding reagent to the next one. Hus auto matically spaces the starting times approximately 2 minutes sport. l) Remove each container from the bath after 35 1 2 minutes, and transfer a portion of the solution to one of two matched one-cm. cells. Determine the DETERMINATION A - 125-ml. flask B - Cork ring C - Glass tubing D - Rubber stopper G - Midget dust impinger, (Fisher 59, Catalog No. 9-258A) E - Rubber tubing H - Dust impinger tube, (Fisher 59, Catalog No. 9-253B) F - Beakers for wet ice and large enough to hold two impingers. A minimum of duplicate sets of apparatus are required. Pngs 7 ucc 049426 VINYL CHLORIDE MONOMER absorbance of aacb solution at 560 millimimons using a Beckman Model B spectrophotomcr and distilled water aa the reference eolation. Deduct the ab sorbance due to the blank from each of the sample solutions. m) Calculation A x VHS m acetaldehyde, ppm. g. sample A total mg. of acetaldehyde. Deter mine from the calibration curve, paragraph q, the mg. of acetalde hyde corresponding to the net ab sorbance due to the solution in each impingcr. Athe sum of these values. n) Calibration curve Pipet one ml. of the primary standard, paragraph b, into a 100-ml. volumetric flask containing 50 ml. of distilled water. Dilute to the mark with distilled water, stopper, and mix thoroughly. o) Prepare a series of standards by pipet ting 0, 0.5, 1.0, 1.5, 2.0, 3.0, 4.0, and 5.0 ml. of the diluted primary standard into respective 25-ml. glass-stoppered graduates. These standards contain 0, 0.05, 0.10, 0.15, 0.20, 0.30, 0.40, snd 0.50 mg. acetaldehyde, respectively, depending on the purity of the original acetaldehyde-ammonia. p) Dilute the contenta of each graduate to the 20-ml. mark with distilled water and determine the absorbance of each standard as described in paragraphs j through 1. Deduct die absorbance of the zero standard from the absorbance of each of the standards to find the net absorbance of the standards. 4. IRON a) Standard iron solution Dissolve 0.2809 g. of fenoua ammonium sulfate, Fe(NHs)2(SO*)2 6H2O, in 50ml. of dis tilled water contained in a 1000-ml. glass-stoppered volumetric flask. Slow ly and with constant swirling add 10 ml. of concentrated c.p. nitric acid and heat to boiling. Cool and dilute to tbs Page 8 mark with distilled water. A 1.0-ml. aliquot of this dilution is equivalent to 0.4 ppm, iron, as Fe, when using a 100-ml. sample. b) Sodium acetate, 2 molar Dissolve 164 t 0.01 g. of c.p. sodium acetate in 1000 ml. of distilled water. c) Alcohol-water solution Measure 25 ml. of S.D.2-B alcohol into a 100-ml. glassstoppered graduate containing 30 ml. of distilled water. Stopper and mix thoroughly. d) Procedure Transfer 25 ml. of the alco hol-water* solution to a 250-ml. glass- stoppered Erlenmeyer flask. e) Into the flask introduce 100 ml. of the chilled sample by means of a suitable chilled transfer graduate. f) Gently swirl the contents of the flask, remove the stopper, and allow the vinyl chloride to evaporate under a fume hood. Swirl the flask to remove the last trace of vinyl chloride. g) Filter the remaining alcoholic solution through a Gooch crucible fitted to a 250-ml. filtering flask and connected to a suitable vacuum system. h) Quantitatively transfer the filtrate to one of two, 100-ml. glass-stoppered volumetric flasks, rinsing the filtering flask with five 5-ml. portions of dis tilled water. i) To the second volumetric flask add 25 ml. of the alcohol-water solution and introduce 1.0 ml. of the etandard iron solution by means of a suitable meas uring pipet. Reserve as a blank. j) To each flask add 2 drops of concen trated c.p. hydrochloric acid and 2 drops of 0.1 per cent bromo-phenol blue indicator in ethanol. k) Add the 2 molar sodium acetate solution dropwise to each flask until each solu tion turns a faint bine. l) To eaeh flask add 4.0 ml. of 10 per cent hydroxylamine hydrochloride solution in water and 10.0 ml. of 0.12 per cent solution of o-phenanthroline in water. ucc 049427 VINYL CHLORIDE MONOMER m) Dilute each eolution to the mark with distilled water, stopper the flasks, and mix each thoroughly. u) Allow the solutions to stand at room temperature far at least 20 minutes. o) Transfer the sample and blank solutions to respective 100-ml. matched tail-form Nesaler tubes. p) Compare the colors of the sample and blank solutions visually in transmitted light. If the color of the sample is more reddish-orange than that of the blank, the iron content of the sample is in excess of 0.4 ppm., as Fe. 5. PHENOL a) Weigh 25 g. of the sample, chilled in a solid carbon dioxide-acetone mixture, to the nearest 0.1 g., into a chilled 100-ml. glass-stoppered volumetric flask. b) Place the flask in room temperature water and allow the vinyl chloride to evapo rate under a fume hood. Do not agitate until nearly dry and then do so to drive off any remaning vinyl chloride. c) Allow the flask to warm to room tempera ture and dilute to the mark with metha nol, specification 1-6A1-1.1 or equiv alent. Stopper the flask and mix thoroughly. d) Introduce 20 ml. of this dilution into a second 100-ml. glass-stoppered volu metric flask by means of a suitable transfer pipet and dilute to the mark with additional methanol. Stopper and mix thoroughly. e) Determine the ultraviolet absorbance on a portion of this dilution using a Beck man Model DU spectrophotometer, a wavelength near 271 millimicrons, and 1.00-cm. silica cells. f) Prepare a series of synthetic samples containing from 5 to 30 ppm. phenol in anhydrous methanol and determine the absoibance of each as described in paragraph e using methanol as a blank. g) Plot the absorbance of the synthetic samples against their respective con centrations. h) Using the absorbance value obtained, parag-aph e, determine the phenol con tent of the sample by reading from the calibration curve, paragraph g, and cal culating aa.folIows: i) Calculation C x 20 phenol, ppm., in original sample C ppm. phenol obtained from curve, paragraph g j) Note: Nonvolatile aromatics, i.e., hydroquinone and diphenylamine, will inter fere with this determination. 6. ETHYLENE AND METHYL CHLORIDE a) Sample handling and special precautions All samples must be taken from a liquid sampling point into evacuated cylinders to prevent fractionation and loss of the more volatile components. Fill the cylinder to approximately 90 per cent of capacity, and drain off 10 per cent from the liquid phase to pre vent possible rapture of the cylinder. Equip the gas handling system of the gas chromatograph with a conven tional vacuum system as described in 58C-9C1-V6.3. b) Instrument parameters Instrument -- Beckman GC 2A Gas Chromatograph or equivalent Recorder -- Brown, 0-1 mv., with inte grator from Disc Instruments, Inc. Column -- 25-ft, 1/4-inch O.D. tubing packed with 25 per cent hexadecane on 60 to 80 mesh Chromosorb W Column temperature -- room tempera ture (25 C.) Eluting gas -- helium Pressure -- 35 psig Flow (measured at outlet at room tem perature)-- 100 c.c. per minute. Filament current -- 300 ma Sample volume -- 10 c.c. (gas) Total elution time -- 20 minutes Page 9 ucc 049428 VINYL CHLORIDE MONOMER VAPOR PRESSURE OF VINYL CHLORIDE AT VARIOUS TEMPERATURES V A P O R PRESSURE, Ibs./sq. In. A B S O LU T E o m (ft 0) C 3 m | I (O Printed in U.SJL TEMPERATURE, C UNION CARBIDE CHEMICALS COMPANY DIVISION OF UNION CARBIDC CONPOMTION 270 P~fc Avwhm, Nr# York 17, N. Y. ucc 049429 F-40540