Document B814L6qebV8a1jmwpwoMe6e4J

Ootobp 8, 1968 Mr* F. K* Cinun Manufacturing Chemists' Assn., Inc. 1825 Connecticut Avenue, I.W. VtahiaftoA, D.C* 20009 Dear Mr* Camas Tour lottor of September 10 la regard to the study being conducted among PVC rosin producers has eons to no for answering* Tou coked aoae speciflo questions on the operational procedures involved in the opening and cleaning of our polymerisation reactors* The specific answers using your nuabering aysten aret 1. The tine before opening is noreally about one--half hour but en occasions nay be longer* 2* The reactor is not evacuated before starting the purge systee which is described in more detail below* 5* before e nan enters the reactor the refrigerated water ia turned onto the jacket end the wall tenperature drops in a few ainutes to about 55F In general our preparation procedure for the cleaning step is se follows* At the end of e batoh where it la decided neeeasary to dean a reactor, the presaura ia reduced to about ataospberio in the polymerisation kettle and the kettle is vented to the outside through e nsnnal valve* The nan-hole is then opened end the wells ere thoroughly washed down with a hose * In the esae of one type of vinyl aeetate oopolymer, the reactor is then partially filled with water containing a small aaount of sodium carbonate end the jacket is heated for one to three hour period* This solution is then dumped end rinsed out* Zs ell cases the AP00002210 Nr* Catnun 2 October 8, 1968 reactor la then pursed of repore by a high-speed ventilation blower with the hose reaching well into the reactor for a period of fifteen to thirty sinutea. The exiting gases are then cheeked and if it la safe* the aan proceed to enter and clean the reactor. We hope that the above contains sufficient details for you to use in your further evaluation of this utter. The institute should have reoeived all of the X-rays which have been requested ef us by this tine and if there is anything further which we can do to help you, please feel free to call on us. Very tiuly yours, AXRCO CHEMICALS & ELASTICS J. X. Barr Technical Manager JTBtpg AP00002211