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Process for production of alkylene carbonates and/or alkylene glycols

A technology of alkylene carbonate and alkylene glycol, which is applied in the fields of organic chemistry methods, chemical instruments and methods, and the preparation of hydroxyl compounds, and can solve the problems of reduced catalyst activity and unrevealed catalyst activity reduction, etc.

Active Publication Date: 2014-09-24
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the reduction in the activity of the catalyst in the hydrolysis step and a method for preventing the reduction in the activity of the catalyst have not been disclosed so far.

Method used

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  • Process for production of alkylene carbonates and/or alkylene glycols
  • Process for production of alkylene carbonates and/or alkylene glycols
  • Process for production of alkylene carbonates and/or alkylene glycols

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] (1) Carbonation process

[0089] By supplying 5 parts by weight / Hr of tributylmethylphosphonium iodide, 0.8 parts by weight / Hr of potassium carbonate, and 78 parts by weight / Hr of raw material ethylene oxide aqueous solution (60% by weight) to the carbonation reaction part, a mixture containing The carbonation process reaction solution of ethylene carbonate and ethylene glycol (EG), the carbonation reaction part includes a carbonation reactor pressurized with carbon dioxide at 2.0 MPa, a residence time of 1 hour, and 100°C.

[0090] (2) Hydrolysis process

[0091] The reaction liquid obtained from the carbonation process is transferred to the hydrolysis reaction part of a hydrolysis reactor including a residence time of 2 hours, a pressure of 0.5 MPa, and a temperature of 150° C., and the contained ethylene carbonate is hydrolyzed to obtain a catalyst and ethylene glycol. The reaction liquid in the hydrolysis step of alcohol was 87.5 parts by weight / Hr.

[0092] (3) P...

Embodiment 2

[0100] (1) Carbonation process

[0101] By supplying 5 parts by weight / Hr of tributylmethylphosphonium iodide, 0.8 parts by weight / Hr of potassium carbonate, and 78 parts by weight / Hr of raw material ethylene oxide aqueous solution (60% by weight) to the carbonation reaction part, a mixture containing The carbonation process reaction solution of ethylene carbonate and ethylene glycol (EG), the carbonation reaction part includes a carbonation reactor pressurized with carbon dioxide at 2.0 MPa, a residence time of 1 hour, and 100°C.

[0102] (2) Hydrolysis process

[0103] With the reaction solution obtained from the carbonation process, first, the hydrolysis reaction of ethylene carbonate is carried out in the first hydrolysis reactor with a pressure of 1.8 MPa and a temperature of 150° C. 2. The hydrolysis reactor hydrolyzes the residual ethylene carbonate to obtain 87.5 parts by weight / Hr of a hydrolysis step reaction solution containing a catalyst and ethylene glycol. The ...

Embodiment 3

[0112] Carry out the distillation of the condensate extracted in the above-mentioned embodiment 2 and the hydrolysis reaction liquid in the distillation column that has 8 theoretical stages, make chloroethanol and chloromethyl dioxolane distill from the tower top together with moisture, from the distillation tower The bottom of the tower recovers ethylene glycol that does not contain organic chlorine compounds.

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Abstract

The object of the present invention is to provide a method for producing alkylene carbonate and / or alkylene glycol, the method comprising: reacting alkylene oxide, water and carbon dioxide in the presence of a catalyst and an alkali metal carbonate And generate the reaction step of alkylene carbonate and / or alkylene glycol, reclaim alkylene carbonate and / or alkylene glycol from the reaction liquid that obtains in this reaction step, make the catalyst that contains catalyst The catalyst circulation process of liquid circulation to the reaction process, this method can maintain the hydrolysis rate and operate stably for a long time without accumulating precipitates in the reaction system. The method of the present invention further includes the step of removing the alkali metal chloride derived from the alkali metal carbonate or the chloride ions derived from the alkali metal chloride in the reaction solution.

Description

technical field [0001] The present invention relates to a kind of manufacture method of producing alkylene carbonate and / or alkylene glycol, it is by making alkylene oxide, carbon dioxide react generation alkylene carbonate in the presence of catalyzer and alkali metal carbonate, And the alkylene carbonate in this reaction liquid is further hydrolyzed to produce an alkylene glycol. Background technique [0002] Ethylene glycol is produced on a large scale by directly reacting ethylene oxide with water and hydrolyzing it. However, during hydrolysis in this method, in order to control the formation of by-products such as diethylene glycol or triethylene glycol, it is necessary to use A large excess of water over the stoichiometric calculated in terms of ethylene glycol. Therefore, it is necessary to distill the produced ethylene glycol aqueous solution to dehydrate a large excess of water, and there arises a problem that a large amount of energy is required to obtain purified...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/10C07C29/80C07C31/20C07B61/00
CPCC07C29/106C07C31/202C07B61/00C07C29/12C07C29/80C07C31/20
Inventor 山岸昌彦小野贵良
Owner MITSUBISHI RAYON CO LTD