System for improving molecular weight distribution of middle-molecular polyisobutene

Abstract

The invention relates to the technical field of production and application of polyisobutene, and in particular, relates to a system for improving molecular weight distribution of middle-molecular polyisobutene. The system comprises a raw material deep freezer, a catalyst tank and a polymerization reaction kettle; the raw material deep freezer is communicated with the polymerization reaction kettle through a raw material pipe, the catalyst tank is communicated with the polymerization reaction kettle through a catalyst pipe, and a homogenizing pump is further communicated between the raw material deep freezer and the catalyst tank. By addition with a homogeneous pump, the combination of raw materials and catalysts is effectively improved; the catalytic effect is effectively improved by arranging a traditional one-way catalyst into a two-way catalyst; the reaction temperature of the polymerization reaction kettle is effectively reduced by arranging an external circulation heat exchanger, the problems of short polymer molecular chains, more small-molecular-weight products and failing to meet the requirement of the required polymerization degree caused by the fact that heat cannot be removed are solved, and the molecular weight distribution of a polyisobutene product is effectively controlled to be 3.5 or below.

Description

Technical field [0001] The present invention relates to the technical field of polyisobutylene production applications, and in particular, a molecular weight distribution improvement system for molecular polyisobutylene. Background technique [0002] Polyisobutylene (referred to as PIB) is a colorless, tasteless, non-toxic viscous or semi-solid material having good heat resistance, oxygen, ozone, chemical resistant, resistant to ultraviolet, acid, and alkali resistance. The volume resistivity is high, small expansion coefficient, no electrical harmful substance, excellent electrical insulation, no residual charcoal, etc. In addition to widely used in lubricating oil additives, petroleum additives, putty glue adhesives, chewing gum additives and electrical insulation In addition, it is also used in the fields of high polymers such as rubber, and the development and utilization prospects are very broad. [0003] In general, polyisobutylene is divided into low molecule polyisobutyle...

AI Technical Summary

Problems solved by technology

Molecular weight distribution is the main quality indicator reflecting medium molecular weight polyisobutylene products, the narrower the distribution the better, currently, the world leader in polyisobutylene production is BASF in Germany, and the molecular weight distribution of its polyisobutene products is below 3.5, while the molecular weight distribution of domestic polyisobutene If it is greater than 3.5, the product cannot enter the international high-end application market, which restricts the further development of the domestic polyisobutylene industry

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