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Device and process for preparing dimethyl carbonate

A technology of dimethyl carbonate and propylene carbonate, applied in the purification/separation of carbonate/haloformate, preparation of carbonate/haloformate, preparation of organic carbonate, etc. Problems such as industrial production, to achieve the effect of reducing equipment investment and production energy consumption, reducing process requirements, and good extraction effect

Inactive Publication Date: 2016-11-23
CHINA CONSTR IND & ENERGY ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] The above-mentioned patent proposes to use a heterogeneous catalyst instead of a homogeneous catalyst for the synthesis of dimethyl carbonate, which solves the problem of catalyst separation, but does not provide a technical solution for industrial production

Method used

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  • Device and process for preparing dimethyl carbonate
  • Device and process for preparing dimethyl carbonate
  • Device and process for preparing dimethyl carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0047] A device for preparing dimethyl carbonate by using a new type of structured packing, comprising a reactive distillation tower 1, an extractive distillation tower 2 and an extraction agent recovery tower 3.

[0048] The side of the reactive distillation tower is equipped with a reactive distillation tower methanol inlet and a reactive distillation tower propylene carbonate inlet, the top of the tower is equipped with a reactive distillation tower top outlet, and the bottom of the tower is equipped with a reactive distillation tower Outlet at the bottom of the tower.

[0049] The rectification section and the reaction section of the reactive distillation tower adopt window-opening flow-guiding structured packing, and the packing sheets of the window-opening flow-guiding structured packing are corrugated packing sheets, see Figure 5As shown, it includes crests 6, troughs 7, and flow guide windows 8 formed on the crests and troughs by cutting. Each packing layer contains ...

Embodiment 2

[0070] The device that utilizes novel structured packing to prepare dimethyl carbonate that adopts in the present embodiment is identical with that in embodiment 1.

[0071] In the present embodiment, adopt above-mentioned device to carry out reactive distillation and produce the processing step of dimethyl carbonate as:

[0072] 1.1. Add propylene carbonate to the reactive distillation column through the propylene carbonate feed port of the reactive distillation column, and add fresh methanol and separated and recovered methanol into the reactive distillation column through the methanol feed port of the reactive distillation column , propylene carbonate and methanol react under the action of a catalyst to generate dimethyl carbonate and propylene glycol. After rectification, the light components containing methanol and dimethyl carbonate azeotrope are extracted from the top outlet of the reactive distillation tower, and the heavy components containing propylene glycol and par...

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Abstract

The invention discloses a device and a process for preparing dimethyl carbonate. The device comprises a reactive distillation column and an extractive distillation column. A methyl alcohol inlet and a propylene carbonate inlet of the reactive distillation column are arranged on the side of the reactive distillation column. A column top outlet of the reactive distillation column is arranged at the top of the reactive distillation column, and a column bottom outlet of the reactive distillation column is arranged at the bottom of the reactive distillation column. A raw material inlet and an extraction agent inlet of the extractive distillation column are arranged on the side of the extractive distillation column. A column top outlet of the extractive distillation column is arranged at the top of the extractive distillation column, and a column bottom outlet of the extractive distillation column is arranged at the bottom of the extractive distillation column. The column top outlet of the reactive distillation column is connected with the raw material inlet of the extractive distillation column. The column top outlet of the extractive distillation column is connected with the methyl alcohol inlet of the reactive distillation column. The device and the process have the advantages that the process is simple and good in effect, operability is high, industrial production is easy to expand, and market prospect is wide.

Description

technical field [0001] The invention relates to a device and a process for preparing dimethyl carbonate by using a novel structured packing, which belongs to the technical field of chemical industry. Background technique [0002] Dimethyl carbonate is non-toxic and environmentally friendly, and can be used as a raw material for the production of polycarbonate, polyurethane, and medicine, and can replace toxic dimethyl sulfate, methyl chloride, phosgene, etc. as methylation and carbonylation reagents. It can be used as a gasoline additive, and it is also a clean and safe green solvent, so it is also known as "the new cornerstone of organic synthesis in the 21st century" and "green chemical products". [0003] In recent years, with the surge in polycarbonate production capacity, the market demand for raw material dimethyl carbonate has become increasingly urgent. [0004] The methods for preparing dimethyl carbonate mainly include: phosgene method, methanol oxidative carbonyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C68/06C07C68/08C07C69/96
CPCC07C68/065C07C68/08C07C69/96Y02P20/10
Inventor 周俊超孙玉玉黄益平黄晶晶刘春江李凭力徐义明
Owner CHINA CONSTR IND & ENERGY ENG GRP CO LTD
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