Homogeneous phase ionic liquid catalyzed high-purity diethyl carbonate synthesizing technology

A technology of diethyl carbonate and ionic liquid is applied in the field of homogeneous ionic liquid catalyzed high-purity diethyl carbonate synthesis process, which can solve the problems of difficult separation of product and catalyst, high production cost, complicated process, etc., and achieve broad market application. Prospects, efficient production, the effect of simple process flow

Inactive Publication Date: 2019-03-12
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0034] Comprehensive above synthetic diethyl carbonate relevant method, can find out that transesterification method is more suitable for green industry, and transesterification method adopts homogeneous catalyst in industrial synthetic DEC reaction, and the product that finally obtains and catalyst separation difficulty, complex process, simultaneously The price of dimethyl carbonate is higher, which leads to the high production cost of DEC, but the conditions of transesterification reaction are mild, non-corrosive to equipment, and non-toxic. In summary, it is necessary to find a green, pollution-free and high-yield catalyst and craft

Method used

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  • Homogeneous phase ionic liquid catalyzed high-purity diethyl carbonate synthesizing technology
  • Homogeneous phase ionic liquid catalyzed high-purity diethyl carbonate synthesizing technology
  • Homogeneous phase ionic liquid catalyzed high-purity diethyl carbonate synthesizing technology

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Experimental program
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Embodiment 1

[0076] The first reactive distillation column T1: column diameter 1000mm; column height 19000mm; the number of plates in the public rectification section, initial distillation section, side line section, and public stripping section are 10, 20, 30, 15 respectively; the internal pressure of the column is 0.5 MPa; tower top temperature 130°C; tower bottom temperature of common stripping section 190°C; tower bottom temperature of side line section 170°C.

[0077] Atmospheric distillation column T2: column diameter 4000mm; column height 50000mm; the number of plates in the public rectification section, initial distillation section, and public stripping section are 10, 20, and 15 respectively; the pressure inside the column is 0.1MPa, and the temperature at the top of the column is 65 °C, the bottom temperature of the common stripping section is 120 °C.

[0078] The molar ratio of raw material ethylene carbonate to ethanol is 10:1, the amount of ionic liquid acetate catalyst is 0.3...

Embodiment 2

[0081] Vacuum distillation tower T3: tower diameter 3000mm; tower height 40000mm; the number of plates in the public rectification section, initial distillation section, side line section, and public stripping section are 10, 20, 30, 15 respectively; the pressure inside the tower is 0.1 MPa The temperature at the top of the tower is 90°C, and the temperature at the bottom of the common stripping section is 160°C; the temperature at the bottom of the side line section is 120°C.

[0082] Vacuum distillation tower T4: tower diameter 3000mm; tower height 40000mm; the number of plates in the public rectification section, initial distillation section, side line section and public stripping section are 10, 20, 30, 15 respectively; the pressure inside the tower is 0.1 MPa ; The temperature at the top of the tower is 165°C, and the temperature at the bottom of the common stripping section is 180°C; the temperature at the bottom of the side line section is 150°C.

[0083] In the first r...

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Abstract

The invention discloses a homogeneous phase ionic liquid catalyzed high-purity diethyl carbonate synthesizing technology, and relates to a catalyzed synthesizing technology. The technology is a catalytic distillation technology for preparing high-purity diethyl carbonate ionic liquid for a lithium battery through ethylene carbonate and alcohol ester exchange by repeatedly using a homogeneous phasecatalyst. In a reaction, a crude product of the initial reaction is a small amount of ethylene carbonate, ethyl alcohol, ethylene glycol, diethyl carbonate and ionic liquid, and a large amount of theethyl alcohol, the ethylene carbonate and the ionic liquid can be recovered and recycled for reproducing diethyl carbonate after the reaction is completed, finally the high-purity diethyl carbonate is obtained; in a reaction process, ethylene glycol is further generated, and the ethylene glycol is bulk chemicals, and can be used as a product for directly separating. In addition, the used catalystcan be repeatedly used, green, pollution-free, and high in catalytic activity. The production technology for diethyl carbonate one-step synthesis is short in synthetic route, simple in technologicalprocess, high in product selectivity and yield, and capable of more effectively producing the diethyl carbonate relative to an existing technology.

Description

technical field [0001] The invention relates to a catalytic synthesis process, in particular to a homogeneous ionic liquid catalyzed high-purity diethyl carbonate synthesis process. Background technique [0002] Diethyl carbonate (CAS: 105-58-8, English name: Diethyl carbonate) is the dicarbonate of ethanol, and it is a colorless and clear liquid at room temperature. The melting point is -43°C, the boiling point is 126-128°C (lit.), the density is 0.975 g / mL at 25°C (lit.), the flash point is 31.1°C, and the vapor pressure is 10 mm Hg (23.8°C). It is mainly used as a solvent for nitrocellulose, resins and some drugs (such as erythromycin), and an intermediate in organic synthesis (such as phenobarbital, pyrethrins). It can also be used in the electrolyte of lithium batteries. [0003] As an important chemical product, DEC has universal application value in the chemical industry. With the rapid development of technology, the demand for DEC in industrial production has also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C68/00C07C69/96C07C68/08
CPCC07C68/00C07C68/08C07C69/96Y02P20/10
Inventor 石磊刘菊许光文王天巍马鸿亿杜博文
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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