Preparation method of ethylene carbonate (propylene carbonate)

A technology of alkenyl ester and carbonic acid, applied in the direction of organic chemistry, can solve the problems of difficult wide application, environmental pollution, restrictions, etc., and achieve the effect of improving catalytic activity, high catalytic activity, and easy synthesis

Active Publication Date: 2017-02-08
KUNMING UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Due to the existence of a large number of by-products in the reaction and the limitation of the source of raw materials, the transesterification method is difficult to be widely used in industry
Phosgene is toxic and corrosive, so it is not conducive to safe production and pollutes the environment

Method used

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  • Preparation method of ethylene carbonate (propylene carbonate)
  • Preparation method of ethylene carbonate (propylene carbonate)

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preparation example Construction

[0023] (1) Preparation of carbamate: under normal temperature and pressure, configure the mixed solution of alkylpolyamine / organic solvent in a 250ml three-necked flask, CO 2 The gas mass flow controller was used to control the flow into the three-necked flask, and reacted for 2 h; the obtained liquid-solid mixture was separated under reduced pressure to obtain a solid, which was placed in a vacuum drying oven at 40 ° C for 1 h, and stored for later use; the absorbent alkyl The polyamine is one of ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and piperazine, and the organic solvent is ethanol, diethylene glycol dimethyl ether, N-methylpyrrolidone, and propylene carbonate One of the esters.

[0024] (2) Preparation of ethylene (propylene) carbonate without a catalyst: add a certain amount of the above five carbamates, EO, and PO into a 50ml hydrothermal reaction crystallization kettle, and use collector type constant temperature heating and ...

Embodiment 1

[0027] It is 6:1 to mix and join in the 50ml hydrothermal reaction crystallization kettle by the mol ratio of EO and ethylenediamine-carbamate, add catalyst ZnO 0.1%mol (promptly account for the mol percentage of total system), adopt heat-collecting type The treatment temperature was controlled by a constant temperature heating magnetic stirrer at 100 °C, the reaction time was 0.5 h, and naturally cooled to room temperature after the reaction; the yield of EC was 92.6%, and the yield of ethylenediamine was 95.2%.

Embodiment 2

[0029] According to the molar ratio of PO and ethylenediamine-carbamate is 6:1 mixed into the 50ml hydrothermal reaction crystallization kettle, add catalyst KF 0.5% mol (that is, account for the mole percentage of the total system), adopt the heat collection method The treatment temperature was controlled by a constant temperature heating magnetic stirrer at 100 °C, the reaction time was 0.5 h, and naturally cooled to room temperature after the reaction; the yield of PC was 90.2%, and the yield of ethylenediamine was 96.3%.

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Abstract

The invention discloses a preparation method of ethylene carbonate (propylene carbonate), and belongs to a novel method for synthesizing cyclic allyl carbonate. According to the method, alkyl polyamine-carbamate prepared in a lab and ethylene oxide (propylene oxide) carry out reactions in the presence of a catalyst to prepare an organic chemical product namely ethylene carbonate (propylene carbonate) with a high additional valve. Moreover, an absorption solvent (alkyl polyamine) can be obtained. The catalyst has a high activity and selectivity, so the yield of ethylene oxide (propylene oxide) is high and can reach more than 90%. The yield of byproduct (alkyl polyamine) can reach more than 95%. The byproduct (alkyl polyamine) can be recovered to cyclically absorb CO2. The fixed C1 resources are converted into an importation chemical product by the preparation method, the greenhouse effect is effectively relieved; at the same time, the problem of large energy consumption for desorption of CO2 in an organic amine solution is solved, and the recovered byproduct can be used to absorb CO2 circularly.

Description

technical field [0001] The invention discloses a method for preparing ethylene (propylene) carbonate, which belongs to a new method for synthesizing cyclic ethylene carbonate. Background technique [0002] CO 2 It is an abundant natural resource of C, which is non-toxic, stable, cheap and easy to obtain, so it has broad application prospects in the field of replacing fossil fuels; it also has important strategic significance for coping with global warming. The more mature technology now is to use CO 2 As a raw material and an epoxy compound under the action of a catalyst to synthesize a cyclic carbonate, it is used in electrolytes for secondary batteries, organic synthesis intermediates, monomers for synthesizing polycarbonates, polar aprotic solvents, and alkylation reactions. Carriers, carriers of bioactive drugs and other fields have a wide range of applications. which uses CO 2 Cycloaddition reaction with ethylene oxide (EO) and propylene oxide (PO) to synthesize eth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/38C07D317/36
CPCC07D317/36C07D317/38
Inventor 赵文波汪洋陈媛李艳红冯东赵倩
Owner KUNMING UNIV OF SCI & TECH
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