Preparation method of energy-saving electronic-grade carbonic ester

An electronic grade carbonate technology, which is applied in the preparation of electronic grade carbonate, electronic grade ethyl methyl carbonate and diethyl carbonate, can solve the problems of high energy consumption and low purity, and achieve high yield , high degree of continuity and low energy consumption

Active Publication Date: 2022-04-22
天津众望创业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Carbonate is widely used in various fields of chemical industry, especially diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) etc. are chemical raw materials or synthetic intermediates commonly used, yet, the preparation method of prior art, obtains The purity of diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) is low, and the preparation energy consumption is high, and the preparation method of a kind of energy-saving electronic grade ethyl methyl carbonate and diethyl carbonate urgently needs further research and development

Method used

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  • Preparation method of energy-saving electronic-grade carbonic ester
  • Preparation method of energy-saving electronic-grade carbonic ester
  • Preparation method of energy-saving electronic-grade carbonic ester

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Effect test

Embodiment 1

[0085] Such as figure 1 Shown, a kind of energy-saving preparation method of electronic grade carbonate comprises reaction procedure, dimethyl carbonate recovery procedure, coarse fractionation procedure, ethyl methyl carbonate refining procedure, diethyl carbonate refining procedure and dimethyl carbonate and methyl alcohol Refining process;

[0086] Industrial-grade dimethyl carbonate and absolute ethanol enter the described reaction process after being preheated by a preheater, and esterification takes place under the action of a catalyst to obtain a compound containing dimethyl carbonate, ethyl methyl carbonate and diethyl carbonate. Esters, and dimethyl carbonate and methanol azeotrope;

[0087] The mixture containing dimethyl carbonate, ethyl methyl carbonate and diethyl carbonate enters the described dimethyl carbonate recovery process to reclaim unreacted dimethyl carbonate;

[0088] The mixture of ethyl methyl carbonate and diethyl carbonate enters the described coa...

Embodiment 2

[0093] Such as figure 2 As shown, on the basis of Embodiment 1, this embodiment further describes the equipment in each process in detail.

[0094] Described reaction procedure comprises prereactor 1 and EMC reactive rectification column 2;

[0095] Described dimethyl carbonate recovery operation comprises DMC recovery tower 3;

[0096] Described rough fractionation operation comprises rough fractionation column 5;

[0097]Described ethyl methyl carbonate refining process comprises EMC delightening tower 6 and EMC deweighting tower 7;

[0098] Described diethyl carbonate refining process comprises DEC delightening tower 8 and DEC deweighting tower 9;

[0099] Dimethyl carbonate and methanol refining process comprise pressurized tower 10, atmospheric tower 11, methanol refining tower 12 and DMC refining tower 13;

[0100] Industrial-grade dimethyl carbonate and absolute ethanol enter the described prereactor 1 to react after being preheated by the preheater, and the reacti...

Embodiment 3

[0111] An energy-saving electronic grade carbonate preparation system, such as image 3 As shown, it includes a pre-reactor 1, an EMC reactive distillation tower 2, a DMC recovery tower 3, an anti-disproportionation reactor 4, a crude fractionation tower 5, an EMC de-light tower 6, an EMC de-weight tower 7, a DEC de-light tower 8, DEC weight removal tower 9, pressurization tower 10, atmospheric tower 11, methanol refining tower 12 and DMC refining tower 13;

[0112] The prereactor 1 is connected with an industrial-grade dimethyl carbonate feed line 14 and an ethanol feed line 15, and the bottom outlet of the prereactor 1 is connected with the EMC reaction rectification tower 2 of the pipeline through the The middle and lower part feed ports are connected, and the catalytic packing containing solid catalyst is arranged in the described EMC reactive rectification tower 2;

[0113] The tower kettle outlet of described EMC reactive distillation tower 2 is connected with the middl...

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Abstract

The invention discloses an energy-saving preparation method of electronic-grade carbonate, which comprises the following steps: preheating industrial-grade dimethyl carbonate and absolute ethyl alcohol by a preheater, then entering a reaction process, and carrying out esterification reaction under the action of a catalyst to obtain a mixture containing dimethyl carbonate, ethyl methyl carbonate and diethyl carbonate; and an azeotrope of dimethyl carbonate and methanol; the mixture enters a dimethyl carbonate recovery process to recover unreacted dimethyl carbonate; the mixture of the ethyl methyl carbonate and the diethyl carbonate enters a coarse separation process to obtain an ethyl methyl carbonate crude product and a diethyl carbonate crude product; the ethyl methyl carbonate crude product is subjected to an ethyl methyl carbonate refining process to obtain electronic-grade ethyl methyl carbonate, and the diethyl carbonate crude product is subjected to a diethyl carbonate refining process to obtain electronic-grade diethyl carbonate. The product prepared by the method is high in quality and high in yield.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for preparing an energy-saving electronic grade carbonate, in particular to a method for preparing energy-saving electronic grade ethyl methyl carbonate and diethyl carbonate. Background technique [0002] Carbonate is widely used in various fields of chemical industry, especially diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) etc. are chemical raw materials or synthetic intermediates commonly used, yet, the preparation method of prior art, obtains The purity of diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) is low, and the preparation energy consumption is high. An energy-saving preparation method of electronic grade ethyl methyl carbonate and diethyl carbonate needs further research and development. [0003] CN111704547A discloses "device and method for coupling production of dimethyl carbonate by heat pump rectification melting crystalliz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C68/06C07C68/08C07C69/96
CPCC07C68/06C07C68/08C07C69/96Y02P20/10
Inventor 王红星李海勇郑广强李飞
Owner 天津众望创业科技有限公司
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