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Regeneration and recovery device and method of methanol alkali metal salt catalyst in dimethyl carbonate synthesis process by ester exchange method

A technology of alkali metal methanol salt and dimethyl carbonate, applied in the field of chemical industry, can solve the problems of inability to reuse, consume and the like, and achieve the effects of easy operation, reduced production cost and high yield

Active Publication Date: 2020-05-05
山西中科惠安化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the shortcoming that methanol alkali metal salt is consumed once by carbonization reaction in the current production process and cannot be reused, the present invention aims to provide a feasible catalyst for methanol alkali metal salt in the process of synthesizing dimethyl carbonate by transesterification Recycling device and method for

Method used

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  • Regeneration and recovery device and method of methanol alkali metal salt catalyst in dimethyl carbonate synthesis process by ester exchange method

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Experimental program
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Effect test

Embodiment 1

[0030] A kind of recovery method of methanol alkali metal salt catalyst in the synthesizing dimethyl carbonate process of transesterification method, comprises the following steps:

[0031] (1) Evaporation: First, the liquid L1 (including methanol, propylene carbonate, 1,2-propylene glycol, catalyst) after transesterification to dimethyl carbonate reaction is introduced into the evaporator 1 for distillation, the condition is: 0.1MPa, the tower kettle temperature is 70 o C, the temperature at the top of the tower is 64 o C, most of the methanol L2 is separated, and enters the storage tank 4 after being condensed by the condenser 3;

[0032] (2) Reactive distillation: valve f1, valve f7, and valve f8 are closed, valve f2 is opened, and the remaining liquid L3 in evaporator 1 (including propylene carbonate, 1,2-propylene glycol, methanol, and catalyst) enters the first distillation column 5A , then the f3 valve is opened, the f2 valve, f7 valve, and f8 valve are closed, at 0.0...

Embodiment 2

[0035] Process is identical with embodiment 1, and the operation condition of distillation tower 1 is 0.05MPa, and tower still temperature is 50 o C, the temperature at the top of the tower is 47 o C; The distillation conditions of the first distillation tower 5A and the second distillation tower 5B are: 0.1MPa, 250 o C; the reaction conditions are: the ratio of methanol:distilled material is 20:1 (wt), 0.05MPa, 100 o C, the reaction time is 35 hours; the operating conditions of the alcohol-water separation tower 6 are: 0.02MPa, the temperature of the tower kettle is 40 o C, tower top temperature 38 o c.

Embodiment 3

[0037] Process is identical with embodiment 1, and the operation condition of distillation tower 1 is 0.01MPa, and tower still temperature is 40 o C, the temperature at the top of the tower is 35 o C; The distillation conditions of the first distillation tower 5A and the second distillation tower 5B are: 0.05MPa, the temperature of the tower bottom is 50 o C, tower top temperature 45 o C; the reaction conditions are: the ratio of methanol:distilled material is 0.6:1 (wt), 0.02MPa, 80 o C, the reaction time is 50 hours; the operating conditions of the alcohol-water separation tower 6 are: 0.05MPa, the temperature of the tower kettle is 50 o C, tower top temperature 47 o c.

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Abstract

The invention discloses a regeneration and recovery device and method of a methanol alkali metal salt catalyst in a dimethyl carbonate synthesis process by an ester exchange method. The device comprises an evaporator, an evaporator reboiler, an evaporator overhead condenser, a methanol storage tank, a reaction distillation tower, an alcohol-water separation tower, an alcohol-water separation towerkettle reboiler, an alcohol-water separation tower overhead condenser and a methanol storage tank. Through the steps of evaporation, reactive distillation and alcohol-water separation, the catalyst liquid containing methanol alkali metal salt, which can be used for synthesizing dimethyl carbonate by the ester exchange method, is obtained. The process provided by the invention has the characteristics of mild conditions, simple process, easy operation and high yield, and can effectively save the use amount of the catalyst sodium methoxide or potassium methoxide in the dimethyl carbonate synthesis process by the ester exchange method, thereby lowering the dimethyl carbonate synthesis cost by the ester exchange method.

Description

technical field [0001] The invention relates to a device and method for regenerating and recovering a methanol alkali metal salt catalyst in the process of synthesizing dimethyl carbonate by transesterification, and belongs to the technical field of chemical industry. Background technique [0002] Dimethyl carbonate (dimethyl carbonate, DMC) is an important organic compound, which was listed as a non-toxic chemical by Europe in 1992. Dimethyl carbonate has a wide range of uses. Because its molecule contains carbonyl, methyl, methoxy and carbonylmethoxy, it can be used as an intermediate in organic synthesis to replace highly toxic phosgene and methyl chloroformate. Esters, dimethyl sulfate, etc. DMC also has high oxygen content and high octane number, which can effectively increase the oxygen content of oil products, so it can also be used as a gasoline and diesel additive with excellent performance. In addition, DMC is also an excellent green solvent, which has broad appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/96C07C68/06B01J38/02B01J38/06
CPCC07C68/06B01J38/02B01J38/06C07C69/96Y02P20/584Y02P20/10
Inventor 肖福魁赵宁刘聪李绍果栗进涛李磊刘磊庞小飞高未敏张建鑫
Owner 山西中科惠安化工有限公司
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