Heat pump distillation apparatus and process for diethyl carbonate

Abstract

The present invention relates to a heat pump distillation device for diethyl carbonate and a technology thereof. The device comprises a reaction distillation column, a heavy component distillation column, a light component distillation column, a dimethyl carbonate separation column and a diethyl carbonate rectification column; after steam materials at the tops of the five columns are led into a compressor and pressurized, and the condensing temperature is raised, the steam materials are then added into a reboiler on the column bottom to heat liquid materials coming from the column bottom; wherein, heat is exchanged among products at the top of the diethyl carbonate rectification column, dimethyl carbonate fed from the bottom of the reaction distillation column and ethyl alcohol fed from the middle part of the reaction distillation column, so as to meet the requirements for the temperature of materials fed into the reaction distillation column; the diethyl carbonate after the heat exchange and methanol steam at the top of the dimethyl carbonate separation column are both cooled by cooling water, or cooled by material solution in other technological methods; the whole material handling system is operated under the completely sealed condition; except a small amount of energy required for maintaining the operation of the compressor, the self-balance of heat can be realized in the present invention, the energy consumption required for producing unit diethyl carbonate is greatly reduced, no boiler is required for heat supply, simultaneously the consumption of cooling water is reduced, and the present invention achieves multiple benefits of energy conservation, water saving and environmental protection.

Description

technical field [0001] The invention relates to a diethyl carbonate reactive distillation and separation device and process, in particular to a diethyl carbonate synthesis and rectification device and process using heat pump technology, and belongs to the technical field of chemical separation process and energy saving. Background technique [0002] Diethyl Carbonate (DEC for short) is an environmentally friendly green chemical product that has attracted widespread attention at home and abroad in recent years. The molecular structure of diethyl carbonate contains ethyl, ethoxy, carbonyl and carbonyl ethoxy, which can carry out ethylation reaction, ethoxylation reaction, carbonylation reaction and carbonyl ethoxylation reaction, and can also be combined with many Condensation reaction, condensation cyclization reaction, etc. of organic compounds. Diethyl carbonate and water will undergo hydrolysis reaction, but the hydrolysis reaction speed is slow, and the hydrolysis speed ...

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Problems solved by technology

[0013] The purpose of the present invention is to solve the shortcomings of high energy consumption and large amount of cooling engineering in the process of traditional transesterification to produce diethyl carbonate, and organically integrate heat pump technology into the traditional process, thereby providing an energy-saving, water-saving and environmentally friendly carbonic acid Diethyl ester reactive distillation device and process

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