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Synthesis method of methyl ethyl carbonate

A technology of ethyl methyl carbonate and synthesis method, which is applied in the direction of organic carbonate preparation, organic chemistry, etc., to achieve the effects of stable catalyst properties, high yield, and simplified production process

Inactive Publication Date: 2010-05-12
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The technical problem to be solved in the present invention is to make up for the defects of the background technology, seek a high-efficiency catalyst with high catalytic activity and stable properties, and realize high ethyl methyl carbonate yield and short reaction time in the two synthetic methods of ethyl methyl carbonate , low energy consumption, no pollution effect

Method used

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  • Synthesis method of methyl ethyl carbonate
  • Synthesis method of methyl ethyl carbonate
  • Synthesis method of methyl ethyl carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1 Impregnation method prepares supported solid base catalyst (active component MgO)

[0028] Take 0.14g of magnesium nitrate, dissolve it in 10ml of deionized water, add 1g of the carrier after dissolving, repeat the stirring and stand still, put the suspension in a 90°C water bath for drying after 6 hours, then transfer it to an oven for drying, and then put it in an inert Calcined at 500°C for 8h under gas atmosphere. The mass content of the obtained MgO is 2% solid base catalyst. The support can be activated carbon, carbon molecular sieve or mesoporous carbon.

Embodiment 2

[0029] Embodiment 2 Impregnation method prepares supported solid base catalyst (active component K 2 O)

[0030] Take 0.09g of potassium nitrate, dissolve it in 10ml of deionized water, add 1g of carrier after dissolving, repeat the stirring and stand still, after 6h, dry the suspension in a water bath at 80°C, then transfer it to an oven for drying, and then dry it in an inert gas Calcined at 800°C for 10h under atmosphere. got K 2 The mass content of O is 8% solid base catalyst. The support can be activated carbon, carbon molecular sieve or mesoporous carbon.

Embodiment 3

[0031] Example 3 Preparation of supported solid base catalyst (active component BaO) by impregnation method

[0032] Take 0.41g of barium nitrate, dissolve it in 10ml of deionized water, add 1g of carrier after dissolving, repeat the stirring and stand still, put the suspension in a 90°C water bath to dry after 6 hours, then transfer it to an oven for drying, and then dry it in an inert gas Calcined at 700°C for 6h under atmosphere. The obtained BaO mass content is 20% solid base catalyst. The support can be activated carbon, carbon molecular sieve or mesoporous carbon.

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Abstract

The synthesis method of methyl ethyl carbonate belongs to the technical field of organic compounds synthesized by ester exchange. Dimethyl carbonate and diethyl carbonate, or dimethyl carbonate and ethanol are used as raw materials to perform ester exchange in the presence of catalyst. The reaction mode comprises two kinds of fixed bed continuous reaction and kettle-type reaction. The catalyst issolid alkali catalyst in which the carrier is active carbon, carbon molecular sieve or mesoporous carbon and the active component is Na2O, K2O, MgO, CaO, SrO or BaO. In the process of fixed bed continuous synthesis, the catalyst is stable without inactivation after long-term use, thereby retaining the high yield of the methyl ethyl carbonate, simplifying the production process, and achieving environmental friendliness and energy conservation. In the kettle-type reaction, the catalytic efficiency is high, the catalyst can be recovered by simple filtering and re-sintering, and the target product can be obtained in short time with high yield.

Description

technical field [0001] The invention belongs to the technical field of synthesizing organic compounds by transesterification, in particular to a method for synthesizing ethyl methyl carbonate with dimethyl carbonate and diethyl carbonate as raw materials, or with dimethyl carbonate and ethanol as raw materials. Background technique [0002] Ethyl methyl carbonate is a widely used asymmetric carbonate compound, which is mainly used as a solvent and an intermediate in organic synthesis, especially as a solvent for non-water-soluble electrolytes in lithium batteries. Compared with symmetrical carbonates, it is also It has methyl and ethyl groups, so it has the advantages of both dimethyl carbonate and diethyl carbonate. When used as an electrolyte solvent for lithium-ion batteries, ethyl methyl carbonate has low viscosity, high dielectric constant, and strong solubility to lithium salts, which can improve the energy density and discharge capacity of the battery, improve safety ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/96C07C68/06
Inventor 贾明君石景慧刘钢赵国明张文祥
Owner JILIN UNIV
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