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The method of synthesizing dimethyl carbonate

A technology of dimethyl carbonate and ethylene carbonate, which is applied in the field of synthesizing dimethyl carbonate, can solve the problems of poor catalyst activity and easy loss of active components, and achieve the effects of stable properties, easy loss and difficult loss

Active Publication Date: 2021-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the prior art has the problems of poor catalyst activity and easy loss of active components, and a new method for synthesizing dimethyl carbonate is provided

Method used

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  • The method of synthesizing dimethyl carbonate
  • The method of synthesizing dimethyl carbonate

Examples

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Embodiment 1

[0016] Preparation of aluminum phosphate aluminum oxide APO: Dissolve 58.8g aluminum nitrate and 22.3g diammonium hydrogen phosphate in 500ml deionized water at room temperature, stir for 1 hour, add 10ml concentrated nitric acid for acidification, continue to drop concentrated ammonia water to adjust the pH value to 8 , filter the formed precipitate, wash with deionized water for 3 times, dry at 120°C overnight, and then dry and roast at 500°C to obtain phosphorus aluminum oxide APO-1, determined by ICP-AES, the content of Al in APO-1 Take Al 2 o 3 Calculated as 40%, the content of P is P 2 o 5 Count as 60%.

Embodiment 2

[0018] The preparation steps of aluminophosphate APO are the same as in [Example 1], except that the amounts of aluminum nitrate and diammonium hydrogen phosphate used are respectively 14.7g and 33.5g to obtain aluminophosphate APO-2, which is determined by ICP-AES. The content of Al in -2 is expressed as Al 2 o 3 Calculated as 10%, the content of P is P 2 o 5 Count as 90%.

Embodiment 3

[0020] The preparation steps of aluminophosphate APO are the same as in [Example 1], except that the amounts of aluminum nitrate and diammonium hydrogen phosphate used are respectively 36.8g and 27.9g to obtain aluminophosphate APO-3, which is determined by ICP-AES. The content of Al in -3 is expressed as Al 2 o 3 Calculated as 25%, the content of P is P 2 o 5 Count as 75%.

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Abstract

The invention relates to a method for synthesizing dimethyl carbonate, which mainly solves the problems of poor catalyst activity and easy loss of active components in the prior art. The present invention adopts the step of contacting ethylene carbonate and methanol with the catalyst under the transesterification reaction conditions; the catalyst includes: 5-40% by weight of alkaline earth metal calculated as MO, and 60-95% by weight of phosphorus-aluminum-oxygen carrier The technical scheme of APO solves this problem well, and can be used in the industrial production of dimethyl carbonate prepared by transesterification of ethylene carbonate and methanol.

Description

technical field [0001] The invention relates to a method for synthesizing dimethyl carbonate, in particular to a method for transesterifying ethylene carbonate and methanol to synthesize dimethyl carbonate. Background technique [0002] Dimethyl carbonate (DMC) has lively chemical properties, excellent physical properties, and is non-toxic and easy to biodegrade. Electrolyte and carbonylation, methylation and carbonyl methoxylation reagents are widely used in chemical industry. At present, all countries are actively studying the green chemical process based on DMC, an environmentally friendly chemical raw material. Among them, the transesterification method has become a method with great industrial prospects because of mild reaction conditions, high yield and co-production of ethylene glycol or propylene glycol. [0003] Generally speaking, alkali metal hydroxides, alkali metal carbonates, and alkali metal alcohols (F.Risse et al., US2011040117; C.P.Allais et al., WO201006...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C27/00C07C29/128C07C31/20C07C68/065C07C69/96B01J29/83
CPCB01J29/83B01J2229/186C07C29/1285C07C68/065C07C69/96C07C31/202
Inventor 陈梁锋何文军王嘉华
Owner CHINA PETROLEUM & CHEM CORP
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