Reaction system of synthesizing polyoxymethylene dimethyl ether

Abstract

The invention discloses a reaction system of synthesizing polyoxymethylene dimethyl ether. The system comprises a raw material mixer and a reactor; the reactor is a tubular floating bed reactor, a discharging port of the raw material mixer is connected with the bottom of the reactor through a supply pipe, and a feeding pump is arranged in the supply pipe; a circulation return pipe and a separationpipe are connected to the branches of the top of the reactor, the raw material mixer is connected to the other end of the circulation return pipe, and the other end of the separation pipe is connected to a downstream separation system. According to the reaction system, it can be guaranteed that a raw material mixture is sufficiently and evenly mixed, the reaction duration time is prolonged, the mixture can be quickly matched with reaction heat, and the temperature of a catalyst bed layer is effectively controlled; the pressure drop of the tubular floating bed reactor is small, blocking is noteasily caused, the raw materials are in sufficient contact with a catalyst, the catalyst is effectively separated from a coarse reaction solution at the same time, the problem of catalyst separationand recycle is solved, and the tubular reactor is easy to amplify and suitable for the reaction system for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of environment-friendly fuel blending component technology and green solvents, and in particular relates to a reaction system for synthesizing polyoxymethylene dimethyl ether. Background technique [0002] Polymethoxy dimethyl ether (DMM 3~6 ) as a new type of environmentally friendly fuel blending component with great application prospects, it has high cetane number, high oxygen content, good low temperature fluidity, can significantly improve the combustion performance of diesel, improve thermal efficiency, and reduce vehicle exhaust emissions Other advantages; polymethoxy dimethyl ether (DMM 3-4 component) is an excellent low-toxic green solvent. [0003] At present, the key to synthesizing polyoxymethylene dimethyl ether mainly lies in its catalyst and reactor. In an ionic liquid acid-catalyzed method, a kettle reactor is used to prepare polyoxymethylene dimethyl ether with methylal, concentrated formaldehyde, ...

AI Technical Summary

Problems solved by technology

[0004] In order to ensure that the raw material mixture is fully mixed and uniform, shorten the reaction residence time, quickly match the reaction heat, effectively control the temperature of the catalyst bed, the bed resistance is small, and at the same time effectively separate the catalyst from the crude reaction liquid, which solves the problem of catalyst separation and recovery. , the present invention provides a reaction system for synthesizing polyoxymethylene dimethyl ether based on the tubular reactor

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