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Preparation method and preparation system of alkyl carbonate

An alkyl carbonate and preparation system technology, applied in the chemical industry, can solve the problems of high cost, complex synthesis process and the like, and achieve the effects of fast speed, simple reaction device and easy preparation

Pending Publication Date: 2020-12-04
SHANDONG HUALU HENGSHENG CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the problem of complex synthesis process and high cost of the synthesis method of alkyl carbonate in the prior art, the present invention provides a kind of preparation method of alkyl carbonate on the one hand, comprising steps:

Method used

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  • Preparation method and preparation system of alkyl carbonate
  • Preparation method and preparation system of alkyl carbonate
  • Preparation method and preparation system of alkyl carbonate

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Embodiment 1

[0067] The present embodiment provides a kind of preparation method of alkyl carbonate, such as figure 1 shown, including:

[0068] S100 Decarbonylation reaction step: decarbonylation the molten alkyl oxalate or the solution of the alkyl oxalate and the catalyst at a temperature between 50°C and 160°C and a pressure between 0.5bar and 5bar Reaction obtains reaction gas and the reaction liquid containing alkyl carbonate;

[0069] S200 Rectification treatment step: performing rectification on the reaction liquid to obtain the product alkyl carbonate.

[0070] In some embodiments, the molecular formula of the alkyl oxalate is R-O-COCO-O-R', wherein both R and R' have carbon atoms between 1 and 8.

[0071] In some embodiments, the catalysts include rhodium carbonyl catalysts, which are liquid at normal temperature and pressure.

[0072] In some embodiments, a heating and melting step is also included: heating and melting the alkyl oxalate to obtain molten alkyl oxalate.

[0073]...

Embodiment 2

[0080] The present embodiment provides a kind of preparation system of alkyl carbonate, such as figure 2 Shown, comprise: reactor 1, rectification unit 2 and solid-liquid separation unit 3, wherein:

[0081] Reactor 1 is used for decarbonylation reaction of alkyl oxalate and catalyst to obtain reaction liquid and reaction gas 120, including: reaction raw material inlet 11, used for feeding reaction raw material 100 into the reactor, including molten oxalic acid alkane The solution of base ester or alkyl oxalate; Catalyst inlet 12, is used to pass into catalyst 110 in the reactor; Reaction gas outlet 13, is used for exporting reaction gas; Reaction liquid outlet 14, and the liquid inlet 21 of rectifying device 2 connected, so that the reaction liquid enters the rectification device 2 for rectification; the catalyst outlet 15 is connected with the fluid inlet 31 of the solid-liquid separation device 3, so that the fluid containing solid impurities enters the solid-liquid separa...

Embodiment 3

[0090] This embodiment takes the preparation of product dimethyl carbonate as an example to illustrate the preparation method and preparation system of the alkyl carbonate of the present invention. In this embodiment, the reaction raw material alkyl oxalate is dimethyl oxalate (molecular formula R-O-COCO-O -R', R and R' are all alkyl groups with 1 carbon atom), the reactor 1 in the preparation system of this embodiment is a stirred tank reactor, the rectification device 2 is a packed rectification tower, and solid-liquid separation Device 3 is a plate-and-frame filter press, and cooling separation device 4 is a shell-and-tube heat exchanger. The connections between these devices are as follows: image 3 shown. The preparation method comprises steps:

[0091] Decarbonylation reaction: heat dimethyl oxalate to 50°C~60°C, the solid dimethyl oxalate melts into a liquid state, enters reactor 1 through the reaction raw material inlet 11, and the dimethyl carbonate solution containi...

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Abstract

The invention discloses a preparation method and a preparation system of alkyl carbonate. The preparation method comprises the following steps: a decarbonylation reaction step: carrying out a decarbonylation reaction on molten alkyl oxalate or a solution of alkyl oxalate and a catalyst under the conditions that the temperature is 50-160 DEG C and the pressure is 0.5-5 bar; carrying out the decarbonylation reaction to obtain reaction gas and reaction liquid containing alkyl carbonate; and a rectification treatment step: rectifying the reaction liquid to obtain the product alkyl carbonate. The preparation method disclosed by the invention is short in process flow, simple in required reaction device, high in reaction process speed, high in product yield and capable of realizing continuous production, the reaction raw material alkyl oxalate is easy to prepare and low in price, and the alkyl carbonate can be economically and efficiently prepared by virtue of the preparation method and the preparation system for the alkyl carbonate disclosed by the invention; the method is suitable for industrial large-scale production, and has huge industrial practical and economic values.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method and system for preparing alkyl carbonate. Background technique [0002] Alkyl carbonate (molecular formula R-O-CO-O-R') is an important class of organic chemical intermediates, which can participate in methylation, carbonylation, carbonyl methylation, and methoxy reactions, and can be condensed into a wide range of The polycarbonate plastics used can also be used as gasoline additives, solvents and phosgene substitutes, and are one of the most promising green chemicals. [0003] There are also many production processes for alkyl carbonate, mainly including phosgene method, alcohol oxidative carbonylation method, transesterification method, urea alcoholysis method and direct synthesis method of carbon dioxide and alcohol. [0004] The phosgene method is the earliest production process method proposed, and it is also the most mature process route currently used, and it ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C68/00C07C69/96
CPCC07C68/00C07C69/96Y02P20/10
Inventor 常怀春于富红崔丽凤孙一倩崔海涛谢洪燕
Owner SHANDONG HUALU HENGSHENG CHEM IND
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