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A kind of method and integrated device for refining dimethyl carbonate

A dimethyl carbonate and integrated device technology, which is applied in the field of industrialized production of dimethyl carbonate, can solve problems such as high energy consumption, unstable device operation, and difficult operation, so as to reduce energy consumption, save production costs, reduce Effect of methanol and water content

Active Publication Date: 2022-07-08
JIANGSU OXIRANCHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] CN101143803A discloses a method for separating dimethyl carbonate and methanol, which mainly solves the problem of unstable operation of the device in the continuous production process when using ionic liquid as the extraction agent
[0013] Adsorptive distillation disclosed in previous patents and literatures uses adsorbent as the packing of the rectification tower, which can achieve a certain purpose of dehydration and adsorption of methanol, but all of them have the disadvantages of high energy consumption and difficult operation

Method used

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  • A kind of method and integrated device for refining dimethyl carbonate
  • A kind of method and integrated device for refining dimethyl carbonate
  • A kind of method and integrated device for refining dimethyl carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The dimethyl carbonate material with a concentration of 99.7% is successively fed into figure 1 The integrated device shown, wherein the proportions of the composite adsorbents in each adsorption tower are as follows;

[0064] (1) Continuous rectification feed position adsorption tower (1# adsorption tower), the amount of cationic resin in the composite adsorbent is 60%, and the amount of porous molecular sieve is 40%;

[0065] (2) The adsorption tower at the top of the low-pressure rectification tower (2# adsorption tower), the amount of cationic resin in the composite adsorbent is 10%, and the amount of porous molecular sieve is 90%;

[0066] (3) The adsorption tower (3# adsorption tower) in the product extraction position, the composite adsorbent porous molecular sieve dosage is 50%, and the aluminum oxide dosage is 50%.

[0067] Table 1 shows the DMC purity and methanol and water content data of the materials treated by the 1# adsorption tower, the 2# adsorption to...

Embodiment 2

[0071] The dimethyl carbonate material with a concentration of 99.7% is successively fed into figure 1 The integrated device shown, wherein the proportions of the composite adsorbents in each adsorption tower are as follows;

[0072] (1) Continuous rectification feed position adsorption tower (1# adsorption tower), the amount of cationic resin in the composite adsorbent is 80%, and the amount of porous molecular sieve is 20%;

[0073] (2) The adsorption tower at the top of the low-pressure rectification tower (2# adsorption tower), the amount of cationic resin in the composite adsorbent is 10%, and the amount of porous molecular sieve is 90%;

[0074] (3) The adsorption tower (3# adsorption tower) in the product extraction position, the composite adsorbent porous molecular sieve dosage is 50%, and the aluminum oxide dosage is 50%.

[0075] Table 2 shows the DMC purity and methanol and water content data after the materials are processed by 1# adsorption tower, 2# adsorption t...

Embodiment 3

[0079] The dimethyl carbonate material with a concentration of 99.7% is successively fed into figure 1 The integrated device shown, wherein the proportions of the composite adsorbents in each adsorption tower are as follows;

[0080] (1) Continuous rectification feed position adsorption tower (1# adsorption tower), the amount of cationic resin in the composite adsorbent is 50%, and the amount of porous molecular sieve is 50%;

[0081] (2) The adsorption tower at the top of the low-pressure rectification tower (2# adsorption tower), the amount of cationic resin in the composite adsorbent is 10%, and the amount of porous molecular sieve is 90%;

[0082] (3) The adsorption tower (3# adsorption tower) in the product extraction position, the composite adsorbent porous molecular sieve dosage is 50%, and the aluminum oxide dosage is 50%.

[0083] Table 3 shows the DMC purity and methanol and water content data after the materials are processed by the 1# adsorption tower, the 2# adso...

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Abstract

The invention provides a method and an integrated device for purifying dimethyl carbonate. The method includes: adsorbing materials through a first adsorption tower, and then feeding them into a first rectifying tower, a second rectifying tower and a third rectifying tower in sequence tower, obtains the initial product from the top of the third rectifying tower; After reflux treatment, another part of the primary product is passed into the third adsorption tower for adsorption to obtain purified dimethyl carbonate. The method and the integrated device of the invention can effectively reduce the content of methanol and water in the dimethyl carbonate by arranging a multi-stage adsorption tower in the continuous distillation process unit, so as to ensure that the battery-level product index requirements are met, and at the same time, the production process greatly reduces the content of methanol and water. The continuous distillation unit consumes energy and saves production costs.

Description

technical field [0001] The invention relates to the technical field of industrialized production of dimethyl carbonate, in particular to a method for refining dimethyl carbonate. Background technique [0002] Dimethyl carbonate (DMC) has low toxicity, excellent environmental protection properties, and is widely used. It has a melting point of 0.5 °C, a boiling point of 90.2 °C, a relative density of 1.073 (20 °C) and a lightning speed of 18 °C. It is an important intermediate in organic synthesis. . Since dimethyl carbonate contains methoxy, methyl, carbonyl and carbonylmethoxy, it has good reactivity and can replace highly toxic phosgene as carbonylation reagent and dimethyl sulfate as methylation reagent , it can directly synthesize food additives, antioxidants, plant protection agents, advanced resins, fuel and pharmaceutical intermediates, surfactants, etc.; at the same time, the oxygen content of dimethyl carbonate is as high as 53.3%, which can be used as an environme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C68/08C07C69/96
CPCC07C68/08C07C69/96Y02P20/10
Inventor 朱建民刘兆滨董振鹏王刚顾晓华俞欢
Owner JIANGSU OXIRANCHEM CO LTD
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