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A method for catalytically synthesizing ethyl methyl carbonate with calcined hydrocalumite

A technology of methyl ethyl carbonate and hydrocalumite is applied in chemical instruments and methods, organic carbonate preparation, physical/chemical process catalysts, etc., and can solve the problems of high price, difficult large-scale application, complicated preparation process, etc., Achieve low cost, easy separation and good selectivity

Active Publication Date: 2019-05-14
SHAOYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the MgO / NC-2 and magnesium aluminate spinel used in the prior art can promote the reaction to reach an equilibrium state in a short period of time, their preparation process is complicated, expensive, and difficult to achieve large-scale application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Catalyst preparation: Prepare 300 mL of aqueous solution A with 0.3 mol of calcium chloride and 0.15 mol of aluminum chloride; prepare 300 mL of aqueous solution B with 0.75 mol of sodium hydroxide and 0.23 mol of sodium carbonate; Under the condition of stirring, add solution A and solution B into 100 mL water at the same speed, keep the pH of the mixed solution at 10-12, react for 0.5 hours, and crystallize at 90°C for 15 hours; after filtering, washing, drying and crushing , to get hydrocalumite Ca 2+ 2 / 3 Al 3+ 1 / 3 (OH) 2 (CO 3 2- ) 1 / 6 4H 2 O: The obtained hydrocalumite was roasted at 400°C for 6 hours to obtain the roasted hydrocalumite.

Embodiment 2

[0022] Catalyst preparation: Prepare 800 mL of aqueous solution A with 0.4 mol of calcium nitrate and 0.1 mol of aluminum nitrate; prepare 800 mL of aqueous solution B with 0.9 mol of sodium hydroxide and 0.12 mol of sodium carbonate; Under the same conditions, add solution A and solution B to 100 mL water at the same speed, keep the pH of the mixed solution at 10-12, react for 2 hours, and crystallize at 120°C for 8 hours; after filtering, washing, drying and crushing, you can get Hydrocalumite Ca 2+ 0.8 Al 3+ 0.2 (OH) 2 (CO 3 2- ) 0.1 ·8H 2 O: The obtained hydrocalumite was roasted at 500°C for 4 hours to obtain the roasted hydrocalumite.

Embodiment 3

[0024] Catalyst preparation: Prepare 200 mL of aqueous solution A with 0.2 mol of calcium sulfate and 0.2 mol of aluminum sulfate; prepare 200 mL of aqueous solution B with 0.56 mol of sodium hydroxide and 0.18 mol of sodium carbonate; Under the same conditions, add solution A and solution B to 100 mL water at the same speed, keep the pH of the mixed solution at 10-12, react for 4 hours, and crystallize at 150°C for 4 hours; after filtering, washing, drying and crushing, you can get Hydrocalumite Ca 2+ 0.5 Al 3+ 0.5 (OH) 2 (CO 3 2- ) 0.25 2H 2 O: The obtained hydrocalumite was roasted at 600°C for 2 hours to obtain the roasted hydrocalumite.

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Abstract

The invention discloses a method for synthesizing methyl ethyl carbonate under catalysis of roasted-state hydrocalumite. The methyl ethyl carbonate is synthesized from dimethyl carbonate and diethyl carbonate which serve as raw materials under the catalytic action of the roasted-state hydrocalumite. The general structural formula of the hydrocalumite is as follows: Ca<2+>1-xAl<3+>x(OH)2(CO3<2->)x / 2.mH2O, wherein x is greater than or equal to 0.2 and less than or equal to 0.5, and m is the number of crystal water and is greater than or equal to 1 and less than or equal to 8. The roasted-state hydrocalumite is a product obtained by roasting hydrocalumite at the temperature of 400 to 600 DEG C for 2 to 8 hours. The method provided by the invention has the following advantages: the catalyst preparation process is simple, the cost is low, and the yield of a product is high; and the catalyst is easy to separate and high in reusability.

Description

technical field [0001] The invention relates to a method for catalytically synthesizing ethyl methyl carbonate, in particular to a method for catalytically synthesizing ethyl methyl carbonate with roasted hydrocalumite. Background technique [0002] Ethyl methyl carbonate is an environmentally friendly asymmetric organic carbonate, which is mainly used as an organic synthesis intermediate and solvent, especially as a solvent for electrolytes in lithium-ion batteries. Compared with traditional lithium-ion battery electrolyte solvents, the advantages of ethyl methyl carbonate are that it can increase the energy density and discharge capacity of the battery, improve safety performance, prolong service life, and have good low-temperature performance. [0003] According to the different raw materials used, the synthetic route of EMC mainly contains the following three: (1), methyl chloroformate and ethanol transesterification method; (2), dimethyl carbonate and ethanol transester...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C68/06C07C69/96B01J23/02
CPCB01J23/007B01J23/02C07C68/06C07C69/96
Inventor 周喜张超
Owner SHAOYANG UNIV
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