Process for preventing polymer buildup in a polymerization reactor

• US 4,255,470 A
• Filed: 07/15/1977
• Issued: 03/10/1981
• Est. Priority Date: 07/15/1977
• Status: Expired due to Term

• Current Assignee: The Geon Co. (Avient Corp.)
• Original Assignee: Goodrich Corporation (Rtx Corporation)
• Inventors: Cohen, Louis, Witenhafer, Donald E., Haehn, James B.
• Primary Examiner(s): Silverberg, Sam
• Application Number:
  US05/815,977
• Time in Patent Office: 1,334 Days
• Field of Search: 526/62, 427/230, 23/252 A
• US Class Current: 427/230
• CPC Class Codes: C08F 2/004 by a prior coating on the reactor walls

Abstract

This invention relates to a process of coating the internal surface of a polymerization reactor in order to substantially eliminate the buildup of polymer on said surfaces during the polymerization process. There is applied to the surfaces a coating composition containing a straight chain or branched polyaromatic amine dissolved in an aqueous acid solution and thereafter the coated surfaces are flushed or rinsed with water without drying the same.

Claims

1. A process for substantially eliminating the buildup of polymers on the internal surfaces of a polymerization reaction vessel which comprises applying to said surfaces a coating solution comprised of a polyaromatic amine having a molecular weight in the range of about 250 to about 1000 dissolved in an aqueous acid solution, said polyaromatic amine having the structure ##STR2## wherein R is H or NH₂, x and y are 1 or 2, and n is from 0 to 5.

2. A process as defined in claim 1 wherein the coating solution has a pH in the range of about 1.0 to about 5.0.

3. A process as defined in claim 1 wherein the acid solution is aqueous hydrochloric acid.

4. A process as defined in claim 2 wherein the polyaromatic amine has a molecular weight in the range of 300 to 600.

5. A process as defined in claim 1 wherein the polyaromatic amine is self-condensed m-phenylene diamine.

6. A process as defined in claim 1 wherein the concentration of acid in the aqueous solution is in the range of about 0.01% to about 20.0% by weight.

7. A process as defined in claim 1 wherein the concentration of polyaromatic amine in the coating solution is in the range of about 0.1% to about 20.0% by weight.

8. A process as defined in claim 1 wherein the acid solution is aqueous phosphoric acid.

9. A process as defined in claim 1 wherein said surfaces after being coated are rinsed with water.

10. A process as defined in claim 5 wherein the self-condensed m-phenylene diamine is dissolved in aqueous hydrochloric acid at a concentration of 1.5% by weight and a pH of 2.7.