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Process for preparing annular carbonate

A technology of cyclic carbonates and epoxy compounds, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, organic chemistry, etc., can solve the problem of low single-component catalytic activity and difficulty in large-scale production , harsh reaction conditions, etc.

Active Publication Date: 2007-07-11
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the methods used are anhydrous conditions or use cyclic carbonates as solvents (such as US2773070), because these catalytic systems still have more or less problems such as low single-component catalytic activity, low selectivity, and poor water stability. , harsh reaction conditions, high energy consumption, expensive catalysts and other disadvantages, it is difficult to be used in large-scale industrial production of EC

Method used

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  • Process for preparing annular carbonate
  • Process for preparing annular carbonate
  • Process for preparing annular carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023]

[0024] Implementation method: In a 100ml stainless steel autoclave, sequentially add 1.0mmol of tetrabutylammonium bromide, 0.66mol of water, and finally add 0.2mol of propylene oxide (1a), seal the reaction vessel, and charge carbon dioxide with an appropriate amount of pressure. The instrument controls the temperature to rise slowly to 125°C, then controls the carbon dioxide pressure to be 2.0MPa, reacts for 1.0 hour, cools to room temperature, unloads the kettle, absorbs excess carbon dioxide with saturated sodium carbonate solution, and distills the resulting liquid under reduced pressure to obtain the product (2a) And (3a), gas chromatography analysis, (1a) conversion rate 94.5%, product (2a) selectivity 95.4%, yield is 90.2%.

Embodiment 2

[0026] Same as Example 1, the catalyst used is 1.0 mmol of tetrabutylammonium iodide, and the others remain unchanged, the conversion rate of (1a) is 99.5%, the selectivity of product (2a) is 95.5%, and the yield is 95.0%.

Embodiment 3

[0028] Same as in Example 2, the catalyst used is 1.5 mmol of tetraethylammonium iodide, and the others remain unchanged, the conversion rate of (1a) is 100.0%, the selectivity of product (2a) is 95.0%, and the yield is 95.0%.

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Abstract

The invention discloses a making method of annular carbonate, which comprises the following steps: adopting epoxy compound and carbon dioxide as raw material; setting the weight rate of water and epoxy compound at 0.01-3 in the reacting course; selecting catalyst from one of quaternary ammonium salt, alkyl halide pyridine or halide 1, 3-imidazole dialkyl under 0.1-10.0Mpa at 313. 15-483. 15K for 0.5-6h.

Description

Technical field: [0001] The invention relates to the technical field of clean catalysis, in particular to a method for synthesizing carbonate from carbon dioxide and epoxy compounds through cycloaddition reaction in an aqueous system. Background technique: [0002] Carbon dioxide is a greenhouse gas and an inexhaustible C1 resource. Its effective fixation has become one of the most challenging issues in this century, and the synthesis of cyclic carbonates is one of the best ways to fix it. Cyclic carbonate is a very good polar solvent, and it has been widely used in the synthesis of pharmaceutical and fine chemical intermediates. In particular, the economic value and industrial demand for the preparation of dimethyl carbonate and the synthesis of ethylene glycol from ethylene carbonate as raw materials are increasing day by day. In recent years, research in this area has received more and more attention. [0003] The catalysts of the reported production of cyclic carbonate...

Claims

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Application Information

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IPC IPC(8): C07D317/38C07D317/36B01J31/02
Inventor 张锁江孙剑成卫国孟震英李谦王蕾
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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