Method for alkylation of isoparaffin and olefin catalyzed by ion liquid

Abstract

The invention discloses a method for the reaction of isoparaffin and olefin alkyl, which are catalyzed by acidic ionic liquid. The method adopts the isoparaffin and the C4 olefin as the reactant; the cation of the catalyst of the acidic ionic liquid is selected from imidazole cation or naphthyridine cation; the anion is selected from trifluoromethyl acid radical, methyl benzene acid radical or bicarbonate; the reaction solvent is water; the reaction temperature is 40 to 85 DEG C; the reaction pressure is 0 to 4.0 Mpa and the reaction time is 0.25 to 1 hours. The invention has the advantages of mild reaction condition, high activity, high selectivity, easy separation of oil and catalyst, circulating catalyst and low corrosive property.

Description

technical field [0001] The invention relates to a method for catalyzing the alkylation reaction of isoparaffins and olefins by an acidic ionic liquid. 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 alkylating oil to gasoline is an effective method to maintain high octane number and low vapor pressure of gasoline. In 1930, H.Pines and V.N.Ipatieff of the United States Global Oil Company found that in strong acids, such as concentrated sulfuric acid, HF, BF 3 In the presence of / HF, etc., the alkylation reaction between isoparaffins and olefins can occur (J.Am.Chem.Soc.1935). Since then, the alkylation process has flourished. [0003] At present, the catalysts used in the industrial alkylation of isoparaffins ...

AI Technical Summary

Problems solved by technology

In 2005, "Journal of Catalysis" reported that 1-butyl-3 methylchloroimidazole ([Bmim]Cl) and AlCl 3 (mol fraction x=0.60) the prepared ionic liquid catalyzes the alkylation reaction of isobutane and butene, the alkene ratio is 12-13, and reacts at 0°C / 1.0Mpa for 3h, and the selectivity of octane is 68.0%. , but the catalytic activity decreased significantly during recycling

[0006] At present, the catalysts that have been industrialized have high construction cost, large acid consumption, strong corrosion, and difficult disposal of waste acid. In particular, they are easy to cause environmental pollution. Hydrofluoric acid is highly toxic and expensive to operate.

Solid acid catalysts have problems such as low activity and easy deactivation

AlCl 3 Type ionic liquids have defects such as strict requirements on water content, instability, and difficulty in separating oil and catalyst, which greatly restricts the industrial application of isoparaffins and olefins alkylation.

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