Method for preparing dicarboxylic acid zinc

A technology of zinc dicarboxylic acid and dicarboxylic acid, applied in the preparation of carboxylate, organic chemistry and other directions, can solve problems such as environmental pollution, and achieve the effects of reducing pollution, simple preparation method and good catalytic activity

Inactive Publication Date: 2015-03-25
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

The above methods all need to use an organic solution as a solvent, which will pollute the environment during the preparation process.

Method used

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preparation example Construction

[0017] The invention provides a kind of preparation method of zinc dicarboxylate, comprising the following steps:

[0018] The dibasic sodium carboxylate aqueous solution and the zinc chloride aqueous solution are reacted to obtain the dibasic carboxylate zinc.

[0019] In the present invention, the preparation method of described sodium dicarboxylate aqueous solution preferably comprises the following steps:

[0020] Dibasic carboxylic acid and sodium hydroxide aqueous solution are reacted to obtain dibasic sodium carboxylate aqueous solution.

[0021] In the present invention, the dicarboxylic acid preferably includes one or more of glutaric acid, adipic acid, succinic acid and sebacic acid.

[0022] In the present invention, the mass fraction of the aqueous sodium hydroxide solution is preferably 10%-40%, more preferably 15%-38%, and most preferably 25%-35%.

[0023] In the present invention, the molar ratio of the dicarboxylic acid to sodium hydroxide in the aqueous sodi...

Embodiment 1

[0043] Add 38.1g of sodium hydroxide aqueous solution with a mass fraction of 21%, add 13.2g of glutaric acid under magnetic stirring, react for 20min, add 34g of zinc chloride aqueous solution with a mass fraction of 40% within 20min at 25°C, react for 1h, filter , washing, and drying to obtain 18.2 g of white powder zinc glutarate, with a yield of 93.3%.

[0044] Carbon dioxide and propylene oxide were polymerized in the presence of the zinc dicarboxylate prepared above to obtain 38.2 g of polycarbonate; the polymerization conditions were: 1 g of zinc glutarate, 100 mL of propylene oxide, carbon dioxide pressure 3.5MPa, reaction time 8h, reaction temperature 70°C.

Embodiment 2

[0046] Add 10.1 g of aqueous sodium hydroxide solution with a mass fraction of 40%, add 7.3 g of adipic acid under magnetic stirring, and react for 30 minutes, add 14.3 g of aqueous zinc chloride solution with a mass fraction of 48% at 30° C. for 10 minutes, and react for 20 minutes. After filtering, washing and drying, 9.8 g of zinc adipate powder was obtained with a yield of 93.8%.

[0047] Carbon dioxide and propylene oxide are polymerized in the presence of the zinc adipate prepared above to obtain 23.7 g of polycarbonate; the polymerization conditions are: 1 g of zinc adipate, 100 mL of propylene oxide, and a carbon dioxide pressure of 3.5 MPa, reaction time 8h, reaction temperature 70°C.

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Abstract

The invention provides a method for preparing dicarboxylic acid zinc. The method comprises the following steps: reacting a dicarboxylic acid sodium aqueous solution and a zinc chloride aqueous solution, so as to obtain dicarboxylic acid zinc. Compared with the prior art, the method takes water as a reaction solvent and avoids adopting organic solvents such as methylbenzene and acetone as the reaction solvent, and a by-product only comprises sodium chloride, so that the environmental pollution is reduced. The dicarboxylic acid zinc prepared by the method can be used for polymerization reaction of carbon dioxide and epoxide and has good catalytic activity. The method is simple, saves energy, and conforms to the concept of environmental protection. Experimental results show that the dicarboxylic acid zinc prepared by the method catalyzes the polymerization reaction of carbon dioxide and epoxy propane to generate polycarbonate, and the yield is 18.4-38.2g polymer / g catalyst.

Description

technical field [0001] The invention belongs to the technical field of zinc dicarboxylate catalysts, in particular to a preparation method of zinc dicarboxylate. Background technique [0002] Carbon dioxide is a major greenhouse gas, and it is also a cheap carbon resource. Using carbon dioxide and epoxy as raw materials to prepare high-molecular polyester materials has the advantages of environmental protection and economy. Therefore, using this method to prepare polycarbonate preparations attention. [0003] Carbon dioxide reacts with epoxide to form polycarbonate under the action of a catalyst. The catalysts used mainly include alkyl zinc-active hydrogen catalytic system, dicarboxylic acid zinc catalytic system, phenolic zinc salt catalytic system, diimine A series of catalysts such as quasi-catalytic system, double metal cyanide compound catalytic system, metal porphyrin catalytic system and ternary rare earth catalytic system. Among them, ternary rare earth catalysts a...

Claims

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Application Information

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IPC IPC(8): C07C55/12C07C55/14C07C51/41C08G64/34
Inventor 张亚明周庆海蔡毅王献红
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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