Apparatus for mass polymerization of vinyl chloride resin and method for mass polymerization of vinyl chloride resin

Patent metadata

Field	Value
Publication number	US-9403144-B2
Application number	US-201414773678-A
Country	US
Kind code	B2
Filing date	Sep 30, 2014
Priority date	Sep 30, 2013
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

Disclosed are an apparatus for mass polymerization of a vinyl chloride resin which may suppress generation of abnormal products (fine-particle products, oversize-particle products, lumpy products due to coagulation, etc.) and a vinyl chloride resin, which causes formation of a poor sphere, and may enhance quality and processability of a vinyl chloride resin, by addressing the problem that an average distance between resin particles is decreased as polymerization proceeds, and thus, microparticles are generated due to excessive coagulation or friction between particles, and a method of mass-polymerizing the vinyl chloride resin. The method comprises additionally inputting a monomer to a reactor in which a monomer and an initiator are contained when a ratio of the monomer converted to a polymer is 30% to 70%.

First claim

What is claimed is:

1. An apparatus for mass polymerization of a vinyl chloride resin comprising a reactor for mass polymerization, the apparatus further comprising an additional supply pipe for additionally supplying a monomer into the reactor during polymerization of the monomer in the reactor in which the monomer and an initiator are contained, and
wherein the additional supply pipe is connected to a lower portion of the reactor.

2. The apparatus according to claim 1 , wherein the reactor further comprises at least one raw material supply pipe and condenser.

3. The apparatus according to claim 1 , wherein the reactor further comprises an exhaust pipe.

4. The apparatus according to claim 3 , wherein the exhaust pipe further comprises a pressure control valve.

5. The apparatus according to claim 1 , wherein the apparatus further comprises a prepolymerization reactor and a raw material supply pipe connecting the reactor and the prepolymerization reactor such that a seed polymer generated in the prepolymerization reactor is flowed in the reactor and another raw material supply pipe for supplying a monomer and a postpolymerization initiator to the reactor.

6. A method of mass-polymerizing a vinyl chloride resin, the method comprising an additional monomer supply step in which a monomer is additionally supplied into a reactor comprising the monomer and an initiator when a ratio of the monomer converted to a polymer is 30% to 70%, and
wherein the additionally supplied monomer is supplied to a lower portion of the reactor.

7. The method according to claim 6 , wherein, in the additional monomer supply step, the monomer is continuously supplied into the reactor.

8. The method according to claim 6 , wherein, in the additional monomer supply step, an amount of the monomer supplied is 0.1 to 10 times within a range within which an amount of the monomer converted to the polymer is 30% to 70%.

9. The method according to claim 6 , wherein a monomer discharge step is further performed during or after the additional monomer supply step.

10. The method according to claim 9 , wherein, in the monomer discharge step, an amount of discharged monomer is 0.1 to 10 times an amount of supplied monomer in the additional monomer supply step.

11. The method according to claim 9 , wherein, in the monomer discharge step, the monomer discharge is performed through a condenser, an exhaust pipe, or a combination thereof.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Dong Kwon

Classifications

• C08F114/06

  Vinyl chloride · CPC title

• B01J19/1862

  placed in series · CPC title

• B01J2219/00162

  controlling the pressure · CPC title

• B01J19/00

  Chemical, physical or physico-chemical processes in general; Their relevant apparatus · CPC title

• B01J19/24 Primary

  Stationary reactors without moving elements inside (B01J19/08, B01J19/26 take precedence; with stationary particles B01J8/02) · CPC title