Production method of polyisobutene

Abstract

The invention provides a production method of polyisobutene, which comprises the following steps of: contacting a reaction mixture obtained by polymerization with steam and water, inactivating a catalyst participating in a polymerization reaction, vaporizing unreacted isobutene and a solvent at the same time, carrying out oil-water phase separation on a liquid phase, and taking the separated oil phase as a polyisobutene crude product. According to the invention, steam (especially water steam) is introduced into the reaction mixture obtained by polymerization, and through a synergistic effect with water, rapid inactivation treatment of catalytic activity is realized. Meanwhile, in the step, unreacted isobutene and solvent are directly separated from the liquid phase through the vaporizationprocess, the energy utilization rate is high, meanwhile, water vapor can be obtained through heating of other processes, the technological process is greatly simplified, and industrialization is quite facilitated.

Description

technical field [0001] The invention belongs to the technical field of chemical technology, in particular to a production method of polyisobutylene. Background technique [0002] Polyisobutene is a product produced by the cationic polymerization of isobutene. Depending on the reaction conditions, polyisobutenes with different molecular weights can be prepared. Among them, low-molecular-weight products with a terminal α-double bond content greater than 60% and a molecular weight range of 500 to 5,000 have very high reactivity, and are called highly reactive polyisobutene (HRPIB), which is very different from traditional polyisobutene. . The α-double bond content and molecular weight distribution are the most important quality indicators of HRPIB, because the reactivity of α-double bonds is the highest, and the reactivity of double bonds toward the interior of macromolecules is very low in general functionalization reactions. Therefore, the higher the α-double bond content,...

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Problems solved by technology

[0005] Chinese patent document CN101223197B discloses a kind of dynamic mixer that is used for catalyst deactivation, and in dynamic mixer, reaction mixture mixes with terminator (comprising water, such as river water, tap water or deionized water etc.), and the addition of terminator can cause Catalyst deactivation, but this kind of mixer has a complex structure and is prone to clogging

Although the method can realize the deactivation of the catalyst, the method separates the termination of the reaction and the separation of unreacted isobutylene and solvent, and the operation is more complicated.

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