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Dimethyl carbonate and ethylene glycol production process

A technology of dimethyl carbonate and ethylene glycol, which is applied in the field of new process flow for catalyzed production of dimethyl carbonate and ethylene glycol with ionic liquid composite catalyst, can solve the problem of low single-pass conversion rate of ethylene carbonate, cumbersome process flow and poor equipment Large investment and other issues, to achieve the effect of improving the conversion rate of one pass, simple process flow, and small investment in equipment

Active Publication Date: 2015-07-08
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the defects of large equipment investment, cumbersome process flow, low single-pass conversion rate of ethylene carbonate, high energy consumption, and high production cost in the above-mentioned documents. The present invention is suitable for catalytic production of ionic liquid composite catalysts. The new technological process of dimethyl carbonate and ethylene glycol, effect and benefit of the present invention are: (a) the catalyzer used in the present invention is a kind of ionic liquid composite catalyst, and this catalyzer need not be separated with ethylene carbonate, has reduced Catalyst separation equipment and operating cost, also simplified technological process simultaneously; (b) the ionic liquid composite catalyst used in the present invention can be recycled, has reduced waste discharge; (c) unreacted ethylene carbonate and water in ion A hydrolysis reaction occurs under the action of a liquid composite catalyst, and the hydrolysis product is carbon dioxide raw material and ethylene glycol product, and the unreacted ethylene carbonate does not need to be separated from ethylene glycol, which reduces the separation and circulation equipment of ethylene carbonate; (d) process flow optimization Integrated with energy, it improves the single-pass conversion rate of ethylene carbonate and reduces energy consumption

Method used

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  • Dimethyl carbonate and ethylene glycol production process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Referring to the figure, it is 0.5kg / h to produce dimethyl carbonate and ethylene glycol with the ethylene oxide feed flow as an example.

[0037] Raw material feed flow rate: ethylene oxide = 0.5 kg / h, carbon dioxide = 0.5 kg / h, methanol = 0.687 kg / h, water = 0.054 kg / h.

[0038] (1) Carbonylation step

[0039] Carbon dioxide and ethylene oxide react in the ethylene carbonate synthesis reactor 1 under the catalysis of the ionic liquid composite catalyst to generate ethylene carbonate. Theoretically, to generate 1kg of ethylene carbonate, it needs to consume 0.5kg of carbon dioxide and 0.5kg of ethylene oxide. In order to improve the conversion rate of ethylene oxide, it is necessary to increase the proportion of carbon dioxide. Excess carbon dioxide is recycled to the Ethylene carbonate synthesis reactor 1 inlet.

[0040] The operating pressure of ethylene carbonate synthesis reactor 1 is 1MPa, and the operating temperature is 190°C; the flow rates of carbon dioxide,...

Embodiment 2

[0058] Referring to the figure, the device for producing dimethyl carbonate and ethylene glycol at 0.5kg / h with ethylene oxide feed flow is an example.

[0059] Raw material feed flow rate: ethylene oxide = 0.5 kg / h, carbon dioxide = 0.5 kg / h, methanol = 0.721 kg / h, water = 0.003 kg / h.

[0060] (1) Carbonylation step

[0061] Carbon dioxide and ethylene oxide react in the ethylene carbonate synthesis reactor 1 under the catalysis of the ionic liquid composite catalyst to generate ethylene carbonate. Theoretically, 0.5 kg of carbon dioxide and 0.5 kg of ethylene oxide are required to generate 1 kg of ethylene carbonate. In order to increase the conversion rate of ethylene oxide, the proportion of carbon dioxide needs to be increased. Excess carbon dioxide is recycled to carbonic acid by flash tank and carbon dioxide compressor. Vinyl ester synthesis reactor 1 inlet.

[0062] The operating pressure of ethylene carbonate synthesis reactor 1 is 5MPa, and the operating temperatur...

Embodiment 3

[0080] Referring to the figure, the device for producing dimethyl carbonate and ethylene glycol with oxyethane feed flow as 0.5kg / h is an example.

[0081] Raw material feed flow rate: ethylene oxide = 0.5 kg / h, carbon dioxide = 0.5 kg / h, methanol = 0.714 kg / h, water = 0.018 kg / h.

[0082] (1) Carbonylation step

[0083] Carbon dioxide and ethylene oxide react in the ethylene carbonate synthesis reactor 1 under the catalysis of the ionic liquid composite catalyst to generate ethylene carbonate. Theoretically, 0.5 kg of carbon dioxide and 0.5 kg of ethylene oxide are required to generate 1 kg of ethylene carbonate. In order to increase the conversion rate of ethylene oxide, the proportion of carbon dioxide needs to be increased. Excess carbon dioxide is recycled to carbonic acid by flash tank and carbon dioxide compressor. Vinyl ester synthesis reactor 1 inlet.

[0084] Ethylene carbonate synthesis reactor 1 operating pressure is 5MPa, operating temperature is 180 ℃; Ethylene...

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Abstract

The invention relates to a dimethyl carbonate and ethylene glycol production process which is characterized in that the process comprises the following five steps: (a) the carbonylation step for production of ethylene carbonate by catalysis of reaction of ethylene oxide and carbon dioxide by use of an ionic liquid composite catalyst; (b) the step of alcoholysis for ester exchange reaction of the ionic liquid composite catalyst-containing ethylene carbonate solution of the step (a) and methanol in a reaction distillation tower and product separation; (c) the step of purification and refining of dimethyl carbonate from tower top condensate in the reaction distillation tower of the step (b); (d) the step of separation, transformation and refining of ethylene glycol from tower bottom liquid in the reaction distillation tower of the step (b); and (e) the step of circulation cycle of from the ionic liquid composite catalyst in the step (d) to the catalyst in the step (a). The process has the characteristics of high ethylene carbonate one-way conversion rate, simple process flow, small equipment investment, less waste emissions, low energy consumption and the like, and can make companies stronger in competitiveness.

Description

technical field [0001] The invention relates to a process for producing dimethyl carbonate and ethylene glycol, which is suitable for a new process flow for catalyzing the production of dimethyl carbonate and ethylene glycol with an ionic liquid composite catalyst. Background technique [0002] Dimethyl carbonate is an important organic chemical intermediate with a variety of reaction properties. It can replace highly toxic dimethyl sulfate, methyl chloride, methyl chloroformate and phosgene in many chemical reaction occasions as methylation, Methoxylation and carbonylation reagents are widely used in polycarbonate, coatings, medicine and other fields. As early as 1992, it was listed as a non-toxic product in Europe. It is an environmentally friendly product that meets the requirements of modern "clean technology". It is known as a "new cornerstone" and "green chemical product" of organic synthesis in the 21st century. [0003] Ethylene glycol is an important organic chemic...

Claims

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Application Information

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IPC IPC(8): C07C27/00C07C29/128C07C31/20C07C68/06C07C69/96
CPCY02P20/10Y02P20/52Y02P20/584
Inventor 成卫国张梅香张军平董坤张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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