Document xjRg78akdMBgRO5wo2aQ6R64g

INTERNAL CORRESrONPrNCE------- cnnr 'll' \15 AMD n.ASTICS insmi i Dr. T. T. Szabo r ih/i ,i<n Mr. J. B. Hollingsworth w Mirv,, * .-ny n> Dr. S. Gates Mr, R. W. Lasher SOUTH CHARLESTON PLANT P. O.UOX WO I, SOUTH CHARLESTON, W.VA. 25303 <j"" January 16, 1976 r>|u, \ ttmu r'"rt ` .'SV f \ Ml'l 1 'V'1} > ,, Vinyl Chloride, DENKA Visit to Discuss Control On January 14, 1976 Messrs. S. Gates, R. W. Lasher and R. N. Wheeler, Jr. met with a group from Denki Kagaku Kogyo K. K, (DENKA) to discuss control of vinyl chloride safety. (See attached list of representatives from DENKA. ) Per agreement there was no discussion of solvent vinyl resins. Miscellaneous items of interest resulting from that discussion are as follows: 1. DENKA feels they are achieving 2 ppm VCM concentration in their plants. This, however, is based on monitoring two days each month. 2. They operate a "closed" reactor technology on suspension resins, but they open reactors and hydraulicly clean them when needed. 3. Their reactors are glass lined ranging in size from 5,500-gallon old reactors to 13, 200-gallon new reactors. The current largest reactor (glass ?) is about 20, 000 gallons. These reactors are equipped with reflux condensers. They are investigating external recirculating slurry coolers. 4. Reactor short Btop is MMHQ or "bis amide". (? ) 5. New glass-lined reactors have a surface treatment in which the hydrogen ion in the glass surface is replaced by silver ion. The treatment is commercially available from the Japanese subsidiary of Pfaudler. This technology has been practiced about three years and started in the ABS resin and latex industries first. The function of the treatment is to reduce fouling. DENKA was satisfied that the initial results were good but they did not know how long it would be effective, particularly as the surface became rough. The treatment can only be done when reactors are reglassed. ucc 031601 6. DENKA has computer control of polymerization plants. The hardware was purchased from Foxboro. Software was generated internally. They say they were the second plant to go to computer control in the world (Huls first). 7. DENKA favors fluid bed dryers for PVC manufacture. 8. Vinyl chloride monomer remaining in the homopolymer was comparable to Union Carbide Corporation's results. They do not make copolymers, i. e. high V. A. resins. 9. A sample of SS-70 containing 2 parts tin stabilizer showed yellowing at 110 minutes (190"C) and blackening at approximately 200 minutes. A press molded plaque of this resin 0. 25 inches thick was very clear, only a very faint haze. 10. DENKA expressed an interest in the mini-computer system on Union Carbide Corporation's automatic analyzers. 11. There was no discussion of dispersion resin technology. This is being handled by another group. An informal agreement was reached to exchange data on governmental regulations and safety or health items. Attached is a copy of the Japanese VCM regulation and a list of the items dis cussed. R. N. Wheeler, Jr, RNWJr. /pm Attachments ucc 031602 Naw York Office Pan American Bldg. 200 Park Ave. New York, N. Y. 10017, 0. S. A. DEWKfl (WMMHMOeiOIMMMHKMMW Telephone : (Area Code 212I-TN-7-1381 Cable Address : OENKASHA NEW YORK Telex: 224717 Answer Back Code: DENKA December 26, 1975 Mr. R, N. Wheeler, Jr. Union Carbide Corporation 437 MacCorkle Avenue, South West, South Charleston, W.Va. 25303 Dear Mr. Wheeler: DEC 30 1975 R N WHEELER. JR. ,. It Is our pleasure to have an opportunity to write to yoy. We are one of leading chemical company In Japan and In our line of products we also have polyvinylchloride and Its mono mer. In Japan we are also facing severe restrictions of VCM emission and working to reduce VCM emission and residual monomer content in polymer. As I called you the other day, three of our technical people in PVC plant are planning to come to this country and want to visit you to talk over VCM stripping from PVC especially solution or dispersion type polymers. If possible we would like to visit you on Jan, 15 or Jan. 14. We will appreciate your Informing us your convenience. Thanking you for your attention to this matter. ' /***' Very truly yours. Denki Kagaku Kogyo K.K. cc: Mr.S. Gates Licensing Mgr,UCC T. Sugimori New York Office "7 ' J Haad Offlca : Sanshin Bldg., 10. Yuraku-cho 1-choma, Chiyoda-ku, Tokyo, 100 Japan UCC 031603 Dankl Kagaku Kogyo Kabuahlkl Kalaha Paga No. Questionaires 1. Method to meet VCM regulation Installation and operation to keep VCM level low; Working area General circumstance ( The atomosphere, drainage) Remainning Monomer 2. Clean reactor technology Solvent cleaning Coating Hydraulic cleaning 3. Automation of VCM, PVC process Computor control 4. Continuous Polymerization 5. Large size reactor of PVC polymerization 6. Increased STY by means of a) reflux condenser b) slurry recirculating cooler 7. Safety control for emergency stop of PVC reactor (agitator, cooling water) 8. Corrosion of reactor Jacket by water 9. Type of PVC drier heat efficiency and steam cost 10. Method to remove static electricity in PVC drying section 11. Area monitoring system ucc 031604 D*nkl Kagaku Kogyo Kabuahlkl Kalaha 12. Quality of general purpose resin Heat stability Plasticizer absorbability Gelation speed 13. Special purpose resin High impact resin Graft resin Heat resistant resin Paga No. 2 UCC 031605