Pre-etherification reaction method in light petrol etherification technology

Abstract

The invention provides a pre-etherification reaction method in a light petrol etherification technology, which comprises the steps that light petrol, methanol and a catalyst are added into an external membrane reactor comprising a reaction kettle and a ceramic membrane filter at a weight ratio of 1:(0.01-0.1):(1-20); the catalyst is a fine-grained styrene cation exchange resin catalyst; the light petrol and methanol perform continuous catalytic etherification reaction in the reaction kettle; a reaction mixture is pumped to the ceramic membrane filter from the bottom of the reaction kettle for catalyst and reaction product separation; a separated product penetrates from a membrane tube as clear liquid; the flow of the membrane penetrating liquid is controlled to be the same as the total amount of a reactant entering the reaction kettle; the reaction product performs further etherification reaction; concentrated liquid containing the catalyst returns to the reaction kettle. Since the method employs the external membrane reactor and the fine-grained resin catalyst, a catalytic effect is significantly improved.

Description

technical field [0001] The invention relates to a method for removing olefins in light gasoline, in particular to a method for pre-etherification reaction in the etherification process of light gasoline. Background technique [0002] Light gasoline etherification technology utilizes tert-amylene and tertiary-hexene in catalytic cracking gasoline to react with methanol to form ether compounds such as TAME and THXME, which can increase gasoline octane number and reduce olefin content and vapor pressure. The etherification of light gasoline is mainly the etherification reaction of etherifiable olefins in gasoline with methanol under acidic catalyst conditions, and mainly C 5 、C 6 The etherification reaction of etherizable olefins generates corresponding ether products, wherein 2-methylbutene-1 and 2-methylbutene-2 ​​react as follows: [0003] [0004] BP Petroleum Company's etherification technology uses a three-functional catalyst that combines hydrogenation, isomerizatio...

AI Technical Summary

Problems solved by technology

[0012] Before entering the catalytic distillation tower, using light gasoline and methanol as raw materials, a continuous catalytic pre-etherification reaction is carried out in an external membrane reactor. The catalyst uses a fine-grained styrene-based cation exchange resin catalyst to constitute a reaction and separation coupling system. It effectively solves the problem of catalyst recycling, shortens the process flow, and realizes the continuous production process

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