US 9,809,665 B2
Polyisobutylene production process with improved efficiencies and/or for forming products having improved characteristics and polyisobutylene products produced thereby
Klaus R. Menschig, Downers Grove, IL (US); Sohel Shaikh, Sugar Land, TX (US); Sathy R. Ponnuswamy, Pearland, TX (US); and Rex Lawson, Pearland, TX (US)
Assigned to TPC GROUP LLC, Houston, TX (US)
Filed by Klaus R. Menschig, Downers Grove, IL (US); Sohel Shaikh, Sugar Land, TX (US); Sathy R. Ponnuswamy, Pearland, TX (US); and Rex Lawson, Pearland, TX (US)
Filed on Mar. 8, 2011, as Appl. No. 12/932,837.
Application 12/932,837 is a division of application No. 12/468,195, filed on May 19, 2009, abandoned.
Prior Publication US 2011/0251359 A1, Oct. 13, 2011
Int. Cl. C08F 10/10 (2006.01); C08F 110/10 (2006.01)
CPC C08F 110/10 (2013.01) [C08F 10/10 (2013.01); C08F 2400/02 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A process for production of polyisobutylene comprising:
subjecting a reaction admixture comprising isobutylene, a diluent for said isobutylene and a catalyst composition to reaction conditions in a reaction zone suitable for causing at least a portion of said isobutylene to undergo polymerization to form a polyisobutylene product including polyisobutylene molecules, at least a fraction of said polyisobutylene molecules having alpha position double bonds, said polyisobutylene product having a number average molecular weight and a polydispersity index;
choosing a diluent concentration corresponding to a pre-selected value of at least one parameter selected from the size of the fraction or the molecular weight;
maintaining the admixture at said chosen diluent concentration to thereby hold said parameter at said pre-selected value;
treating said product to remove diluent and unreacted isobutylene therefrom; and
recycling at least one of the diluent and the unreacted isobutylene back to said zone, wherein said diluent consists essentially of isobutane and a C3-C16 1-alkene.