Method for catalytically synthesizing cyclic carbonate based on multi-active-center type ionic liquid
A cyclic carbonate, ionic liquid technology, used in chemical instruments and methods, catalytic reactions, physical/chemical process catalysts, etc., to achieve high thermal stability, efficient conversion, and high activity.
Active Publication Date: 2021-01-22
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology
The catalytic stability is good, and the activity can be kept unchanged after repeated use, but the use of a co-catalyst is required to achieve the ideal catalytic effect
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0035] This example is to synthesize a kind of polycentric ionic liquid catalyst, and concrete structure is as follows:
[0036]
[0037] Weigh 0.40g (0.0006mol) of hexaperbromomethylbenzene and place it in a 100mL round-bottomed flask, add 0.0048mol N-methylimidazole and 50mL of acetonitrile, and place the mixture at 80°C under N 2 Reaction in protection for 24h. After the reaction, the product was washed with anhydrous ethyl acetate three times, 150 mL each time. After washing and filtering, the product was dried in a vacuum oven for 12 hours, and the temperature was set at 60°C.
Embodiment 2
[0039] This example is to synthesize a kind of polycentric ionic liquid catalyst, and concrete structure is as follows:
[0040]
[0041] Referring to Example 1 for the synthesis method, only N-methylimidazole is changed to N-ethylimidazole.
Embodiment 3
[0043] This example is to synthesize a kind of polycentric ionic liquid catalyst, and concrete structure is as follows:
[0044]
[0045] Referring to Example 1 for the synthesis method, only N-methylimidazole is changed to N-propylimidazole.
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The invention discloses a method for catalytically synthesizing cyclic carbonate based on multi-active-center type ionic liquid. A series of multi-active-center type ionic liquids are designed, efficient conversion of cyclic carbonate can be achieved in a short time under the condition that the use amount of the ionic liquids is very small in the reaction, and the stability and the activity of theionic liquids are superior to those of single-active-center type ionic liquids. The method is characterized by comprising two stages: an ionic liquid synthesis stage and a catalytic cycloaddition reaction stage. In the synthesis stage of the ionic liquid, the reaction is carried out in a nitrogen atmosphere, the reaction temperature is 20-200 DEG C, the reaction pressure is normal pressure, and the reaction time is 1-48 hours, so that the multi-active-center type ionic liquid is obtained; wherein the catalytic cycloaddition reaction stage comprises that the ionic liquid is adopted as a catalyst, the reaction temperature is 30-180 DEG C, the reaction pressure is 0.1-8 MPa, the reaction time is 0.25-24 h, the product cyclic carbonate is obtained, and the anion of the ionic liquid can promote the ring opening of the epoxy compound in the process. The catalytic process has the following advantages that through the design of a multi-active center site structure, efficient conversion of thereaction is achieved, meanwhile, cyclic carbonate can also be used as a raw material source of efficient chemicals such as downstream dimethyl carbonate and ethylene glycol, and good economical efficiency and energy saving performance are achieved.
Description
Technical field: [0001] The invention relates to the technical field of green and clean catalytic cyclic compounds, in particular to a method for catalytically synthesizing cyclic carbonates based on multi-active-center ionic liquids. Background technique: [0002] Carbon dioxide is the main cause of the greenhouse effect and is also an abundant resource in C1. In order to increase environmental protection and sustainable use of resources, converting carbon dioxide into high value-added organic chemicals is an excellent solution. This route can achieve high utilization efficiency of atoms, less by-products and meets the strategic requirements of green chemistry. Among them, as a very important chemical product and intermediate of downstream chemical products, cyclic carbonate has high solubility, boiling point, and good biodegradability, and is widely used in extraction and separation, electrolyte, and polymer synthesis. and other fields. Therefore, the conversion of carbo...
Claims
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IPC IPC(8): C07D317/36C07D317/38B01J31/02C07D233/58C07F9/54
CPCC07D317/36C07D317/38B01J31/0284B01J31/0288B01J31/0291C07D233/58C07F9/5421B01J2231/341
Inventor 成卫国常洁苏倩董丽褚俊杰钱伟张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI