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Method for preparing cyclic carbonate by using catalysis of periodic usable functional polyglycol

A cyclic carbonate and catalyst technology, applied in the field of preparing cyclic carbonate, can solve the problems such as the catalyst cannot be recovered and recycled, increase equipment investment, affect product quality, etc., achieve an environmentally friendly cleaning process, save processes, and improve product purity. Effect

Inactive Publication Date: 2009-07-15
NANKAI UNIV
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Problems solved by technology

The synthesis of cyclic carbonates by the addition reaction of carbon dioxide and epoxides has been industrialized forty years ago. At present, most of the production processes of cyclic carbonates use homogeneous catalytic processes. This method has high reactivity and good selectivity. However, the catalyst cannot be recovered and recycled, so the cost is relatively high; moreover, the product must be separated and purified through distillation and other processes, which is time-consuming, energy-consuming, increases equipment investment, and also affects product quality.
In addition, in order to obtain high-quality products and improve the conversion rate of epoxides, many processes must use volatile organic solvents, causing pollution to the environment

Method used

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  • Method for preparing cyclic carbonate by using catalysis of periodic usable functional polyglycol
  • Method for preparing cyclic carbonate by using catalysis of periodic usable functional polyglycol
  • Method for preparing cyclic carbonate by using catalysis of periodic usable functional polyglycol

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Embodiment 1

[0033] The synthesis of embodiment 1 cyclic carbonate

[0034] 1. Preparation of catalyst BrBu 3 PPEG 6000 PBu 3 Br

[0035] (1) Synthesis of Brominated Polyethylene Glycol

[0036]

[0037] In the 250ml three-necked bottle, add CH in sequence 2 Cl 2 (80ml), PEG 6000 (30g, 5mmol) (40°C, dried under vacuum), then cooled to 0°C with an ice-salt bath, and slowly added PBr 3 (6ml, 64mmol), after reacting for 5h, the reaction was continued for 10h at room temperature, and the reaction mixture was concentrated after the reaction was completed. Then add ether (newly steamed with sodium), let it slowly precipitate. The resulting solid was filtered with suction, washed twice with diethyl ether (freshly steamed with sodium), and dried to obtain 26.5 g of light yellow solid with a yield of 87%.

[0038] (2)BrBu 3 PPEG 6000 PBu 3 Synthesis of Br

[0039]

[0040] First evacuate the 250ml three-neck bottle, and inject N 2 , after repeating the operation twice, add 50ml ...

Embodiment 2

[0048] Embodiment 2 The inventive method and adopting phosphonium salt to do the comparison of catalyst synthesis result

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Abstract

The invention discloses a preparation method of a cyclic carbonate. The cyclic carbonate is synthesized by using carbon dioxide and epoxide as main reaction raw materials and using functionalized polyethylene glycol with the structure shown in the right formula as a catalyst. The preparation method of the present invention has no organic solvent, fast speed, and can be carried out smoothly under low pressure; the homogeneous catalyst is easy to recover and recycle, and is suitable for continuous production; the separation effect of the catalyst is easy to be detected by phosphorus nuclear magnetic resonance; functionalized PEG ( The structure of the catalyst, X-R3P+PEGPR3+X-) is easy to modify, and the catalytic activity and separation effect can be adjusted by adjusting the molecular weight of PEG, the size of R group, electronic effect and anion.

Description

technical field [0001] The invention relates to carbon chemistry and chemical industry and green catalytic technology, in particular to the preparation of cyclic carbonate by using recyclable functionalized polyethylene glycol as a catalyst. Background technique [0002] Cyclic carbonate is a high-efficiency solvent and an excellent extractant, stable in nature, non-toxic, non-corrosive to carbon steel equipment, and has good solubility in polymer compounds. At present, the most important application is to remove carbon dioxide and hydrogen sulfide in natural gas, petroleum cracking gas, oilfield gas, and ammonia conversion gas, and the effect is remarkable. It can be used as an excellent medium for high-energy batteries and capacitors in the electronics industry, and can be used as a solvent and plasticizer for polymers in the polymer industry. It can also be used as an oily solvent and an extractant for olefins and aromatics. In the textile industry, it can be used as an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D317/36B01J31/06
Inventor 何良年田杰生苗成霞蔡飞杜亚王金泉张洪学
Owner NANKAI UNIV
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