Document 5bQ4K7qKGm7GnGz5MXykzR6MR

>OLVAY VINYL CHLORIDE MONOMER J Reagents: ANALYTICAL METHOD - ACETYLENE / if Px P P Pj 3- Solution A : Weigh 20 grams anhydrous cupric sulfate, to this^M cautiously addi 100 ml. NH4OH with constant stirring. Make to 1 liter with disstilled water. 3.T' ,, Solution B: Weigh 70 grains of hydroxylamine hydrochloride. Dissolve in distilled water, make to 1 liter. Note: Presence of iron in cuprous Bulfate solution interfers with acetylene precipitation, filter to remove. Hydrochloric Acid (Concentrated) 1:50 Ammonium Hydroxide 3056 Hydrogen Peroxide Acetic Acid Potassium Iodide 0.10N Sodium hyposulfate solution Starch indicator Apparatus: 250 ml. gas scrubbing bottle with fritted glass thimble and 25 ml. weighing bottle. Gooch crucible 250 m3. beaker 50 ml. burette Balance Procedure: Mix 60 ml. Solution A to 60 ml. of Solution B and add solution to gas scrubbing bottle. Allow all vinyl to evaporate. Filter off precipitate onto a Gooch crucible packed with HC1 washed asbestos slurry. Rinse scrubbing bottle with 1:50 NH4OH, filter through s jue crucible. Now wash acetylene precipitate free of all copper reagent with the aaunonical water solution. Remove the precipitate from the Gooch to a 250 ml. beaker and dissolve in 75-100 ml. of concentrated hydrochloric acid. Boil to dissolve the precipitate. Coci and care fully add 5 ml. 30# H202. Boil until excess H2O2 is removed and evaporate solution down to 25 ml. Neutralize with NH4OH, and make acid with acetic acid adding an excess of 3 ml. Cool and add 2 grams KI. Titrate solution with 0.10N Na2S203 using starch as an indicator. Net ml. of 0.10N Na2S203 x 0.0013 Jt 100 Weight of Sample # triple bond as acetylene CBY 1022843 RSV0030193