System using supported ionic liquid catalyst for continuous preparation of polyoxymethylene dimethyl ether

Abstract

The invention discloses a reaction system and process using methanol and concentrated formaldehyde as initial reaction raw materials and a supported ionic liquid for catalyzed acetalation for preparation of polyoxymethylene dimethyl ether. The reaction system mainly comprises a reaction zone and a refining zone, the reaction zone includes a raw material pre mixing tank, a tank reactor, a reactor circulating pump, a circulating heat exchanger and the like, and the refining zone includes a reaction liquid distillation system, an extraction system, a catalyst concentration circulation system, an alkali washing system, a rectification separation system and the like. The reaction system uses the methanol and concentrated formaldehyde as the initial reaction raw materials for continuous acetalation for preparation of the polyoxymethylene dimethyl ether. The process is simple, the energy consumption is low, an extractive distillation separation mode is used, the ionic liquid catalyst is in no need of separation, and is supported on a carrier, the catalyst loss is reduced, the energy consumption is reduced, the product purity is high, the new tank reactor is used, and the reaction system and the process are suitable for large-scale industrialized production.

Description

technical field [0001] The invention relates to a reaction system and process for synthesizing polyoxymethylene dimethyl ether by using a loaded ionic liquid to catalyze methanol and concentrated formaldehyde or paraformaldehyde. Background technique [0002] In recent decades, with the increasingly serious energy crisis and increasing oil consumption, environmental protection regulations have become more and more stringent. The use of ultra-clean diesel oil is required, and the development of many new alternative diesel oils that can reduce pollutant emissions has emerged. Among them, the use of diesel blending components without adding additional devices or changing the engine structure is considered to be a convenient and effective measure. . [0003] In recent years, researchers have added oxygenated fuels such as methanol and methylal to diesel, which effectively reduced the emission of soot and exhaust gas. However, these compounds have low vapor pressure and cetane n...

AI Technical Summary

Problems solved by technology

But until now, due to various shortcomings of the catalysts used, such as inorganic acids corroding equipment and polluting the environment, conventional resin catalysts are used at low temperatures and affect reaction efficiency, the mature industrialization of products has not been realized.

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