Ion liquid catalyst for producing alkylated oil and its preparation method

Abstract

The present invention is one kind of ionic liquid catalyst for produce alkylated oil and its preparation process. The catalyst is ionic liquid modified with sulfur or oxygen containing organic compound, benzene or alkyl derivative of benzene, and is used in preparing alkylated oil. It possesses alkylation selectivity, and the alkylated oil product has high octane number, C8 component accounting for 70-90 %, and the outstanding advantage of trimethylpentane proportion in the C8 component over 90 %. In addition, the catalyst can result in product yield up to 170-180 vol% of olefin feed.

Description

Technical field: [0001] The invention relates to an ionic liquid catalyst for producing alkylated oil and a preparation method thereof. Background technique: [0002] With the rapid development of the automobile industry and the increasing emphasis on environmental protection, the demand for unleaded high-octane gasoline is increasing all over the world, and the content of aromatics and olefins in gasoline will also be limited. In this case, adding alkylate to gasoline is an effective way to maintain high octane number and low vapor pressure of gasoline. [0003] As we all know, the catalysts currently used in the alkylation of alkanes and olefins in industry are mainly liquid strong acids such as concentrated sulfuric acid or hydrofluoric acid. However, these liquid strong acids have problems such as strong corrosiveness, difficult production operations, troublesome post-processing of products, and serious environmental pollution. In today's world, which attaches great im...

AI Technical Summary

Problems solved by technology

French patent FR2626572 uses imidazole-type or tetra-substituted amine-type ionic liquids as catalysts for the alkylation of isoparaffins and olefins, but the reaction products of this patent are mainly isomeric C6 and C7, and the content of C8 alkane in the product is very low. It does not have practical application value; and the ionic liquid in which imidazole is a cation is difficult to be popularized and utilized due to the difficulty of its synthesis and the price problem

[0006] In its patent (CN1432627A), researchers from the University of Petroleum (Beijing) disclosed that an ionic liquid containing a single metal element was used to catalyze the alkylation reaction of isobutane and butene, and achieved good results. The C8 content can be It was increased to about 70%. After that, they produced composite anion ILs (CN1500764A) containing two or more metals, and the yield of alkylated oil prepared by using it as a catalyst can reach 170-180% of the olefin feed volume. %, the proportion of C8 in the alkylate oil can reach 60-80%, the proportion of trimethylpentane in the C8 component can reach more than 70%, and the RON (research octane number) can reach 93-98, but Due to the poor miscibility of the two metal salts in the preparation, it is not easy to prepare ionic liquids, and the preparation process is relatively cumbersome