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Method for synthesizing dimethyl carbonate and co-producing ethylene glycol by coupling CO2

A technology of dimethyl carbonate and ethylene glycol, which is applied in the field of coupling CO2 to synthesize dimethyl carbonate and co-produce ethylene glycol, which can solve the problems of high water consumption, low carbon utilization efficiency, and large carbon dioxide emissions, so as to avoid environmental pollution. Pollution, carbon emission reduction, and productivity improvement effects

Pending Publication Date: 2021-09-28
HEFEI UNIV OF TECH
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Problems solved by technology

[0006] The traditional coal-to-ethylene glycol technology has problems such as low carbon utilization efficiency, high water consumption and large carbon dioxide emissions. In order to effectively solve these series of problems, the present invention provides a coupling CO 2 Method for synthesizing dimethyl carbonate with co-production of ethylene glycol, aiming to improve process carbon utilization efficiency, energy efficiency and economic benefit

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  • Method for synthesizing dimethyl carbonate and co-producing ethylene glycol by coupling CO2

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Embodiment 1

[0038] Such as figure 1 As shown, this embodiment couples the CO 2 The method for synthesizing dimethyl carbonate co-production ethylene glycol may further comprise the steps:

[0039] S1: Raw coal gasification to produce crude synthesis gas

[0040] After the dried raw coal is pulverized and sieved, the gasification reaction is carried out (high temperature 1300-1500°C, pressure 2.7-6.5MPa, oxygen as gasification agent), and H 2 , CO and CO 2 The main crude synthesis gas (the H in the crude synthesis gas 2 The molar ratio to CO is between 0.3 and 0.8).

[0041] S2: Water-gas shift of crude synthesis gas

[0042] A part of the crude synthesis gas prepared in step S1 is subjected to water-gas shift to make CO and H 2 O reacts to form H 2 and CO 2; The crude synthesis gas after the water-gas shift is merged with the remaining crude synthesis gas that has not been subjected to the water-gas shift to obtain the crude synthesis gas after the hydrogen-carbon ratio is regulat...

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Abstract

The invention discloses a method for synthesizing dimethyl carbonate and co-producing ethylene glycol by coupling CO2, which comprises the following steps: carrying out coal gasification on feed coal to obtain crude synthesis gas, and then carrying out water-gas shift, acid gas removal, methanol synthesis, dimethyl carbonate synthesis, ethylene glycol synthesis, dimethyl carbonate refining and ethylene glycol refining. Co-production of dimethyl carbonate and ethylene glycol is realized. Compared with a traditional coal-to-ethylene glycol process, the method provided by the invention has the advantages that CO2 is recycled, the emission of CO2 is obviously reduced, and the carbon utilization efficiency, the energy efficiency and the economic benefit of the system are improved.

Description

technical field [0001] The invention belongs to the field of energy and chemical technology, in particular to a coupling CO 2 A method for synthesizing dimethyl carbonate and coproducing ethylene glycol. Background technique [0002] Ethylene glycol (EG) is considered as a strategic chemical basic raw material and chemical intermediate. The downstream market is huge. Industrially, it mainly supplies raw materials for the polyester industry. In addition, as a bulk commodity, it is widely used in surfactants, antifreeze, Plasticizers and many other fields. As of 2019, the total production capacity of ethylene glycol in the world has reached 39.69 million tons per year, and the annual output of ethylene glycol has exceeded 25 million tons. The demand for ethylene glycol is expected to grow at a rate of 5% per year. The rapid development of industry has also given birth to a broad ethylene glycol consumption market. In 2015, China's ethylene glycol consumption capacity reached...

Claims

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Application Information

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IPC IPC(8): C07C68/04C07C69/96C07C29/128C07C31/20C07C68/08
CPCC07C29/1285C07C68/04C07C68/08C07C31/202C07C69/96Y02P20/141
Inventor 杨庆春张金亮张大伟储根云
Owner HEFEI UNIV OF TECH
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