A kind of aluminum trichloride catalyst system and its method for producing low molecular weight polyisobutylene

Abstract

The invention discloses an aluminum trichloride catalyst system and a method for producing low-molecular-weight polyisobutene with the same and relates to a catalyst system and a method for producing polyisobutene with the same. The aluminum trichloride catalyst system is prepared from raw materials in parts by weight as follows: 5-50 parts of anhydrous aluminium trichloride powder and 50-95 parts of an isobutylene oligomer. The aluminum trichloride catalyst system is free of foreign organic matters and environmental pollution; the aluminum trichloride catalyst system has high adaptability to the raw materials and is used for polymerization production of the low-molecular-weight polyisobutene from an isobutylene-containing mixed C4 raw material, the required low-molecular-weight polyisobutene can be obtained, the low-molecular-weight polyisobutene product is high in purity and free of other organic matter residues, and an isobutylene oligomer byproduct can also be obtained.

Description

technical field [0001] The invention relates to a catalyst system and a method for producing polyisobutene, in particular to an aluminum trichloride catalyst system and a method for producing low molecular weight polyisobutene. Background technique [0002] Polyisobutene is a polymer with a wide range of uses. According to the molecular weight, it can be divided into low molecular weight polyisobutene, medium molecular weight polyisobutene and high molecular weight polyisobutene. Among them, low molecular weight polyisobutene is usually polyisobutene with index average molecular weight of 500-5000. Widely used in lubricating oil additives, insecticides, electrical cable insulation oil, sealing putty, adhesives, plasticizers, etc. Most of the current production technology of polyisobutylene is based on Lewis acid catalyst system, the proton donor is the co-catalyst, and the two form a complex to release H + Or carbocations initiate the polymerization of isobutene. Among the...

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Problems solved by technology

[0003] CN101033275A adopts AlCl 3 The catalyst is composed of nitrogen-containing, phosphorus-containing or oxygen-containing organic compound complexing agent, and the CN101293935A catalyst adopts AlCl 3 or TiCl 4 The main catalyst forms complex ion pairs with halogenated alkanes and organic solvents. The organic solvents are aromatic hydrocarbons or acetone. CN87103538 uses a catalyst prepared from aluminum trichloride and the second component of aromatic hydrocarbons, the third component of halogenated alkanes or halogens or water Solution, what CN1353123A adopted is the complex catalyst system prepared by aluminum trichloride and the second component aromatic hydrocarbon, the third component acid or acid anhydride, all added other organic compounds in the catalyst system in the above-mentioned technology, the preparation process is complicated, It has certain pollution to the environment and is not conducive to environmental protection. It is used in the production of polyisobutene, which will have a certain impact on the quality indicators and performance of the product polyisobutene and its by-product isobutylene oligomers.