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Preparation method of copper and zinc catalyst and application

A catalyst, copper-zinc technology, applied in the field of preparation of copper-zinc catalyst, can solve the problems of increasing the specific surface area of ​​the catalyst, difficult to large-scale continuous production, reducing operation steps, etc. good effect

Active Publication Date: 2017-06-09
杭州催研科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The yield of this method can reach 90%, but the reaction pressure of this method is relatively high, and it is difficult to produce continuously on a large scale
In Chinese patent CN104907071A, it uses alkaline substances to adjust the pH of water-soluble aluminum salts, then adds the mixture to the aqueous solution of soluble copper salts and soluble zinc salts, and then adjusts the pH of the obtained mixture with other alkaline solutions to obtain copper hydroxide hydroxide Zinc catalyst, filtered, dried, and roasted to obtain a copper-zinc catalyst. The catalyst obtained by this method can obtain higher ester conversion and alcohol selectivity when used in ester hydrogenation, but the type of alkaline substance used Many, and the amount is large
This method reduces the operation steps, increases the specific surface area of ​​the catalyst, and improves the catalyst activity, but uses an organic solvent, which may have an impact on the environment

Method used

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preparation example Construction

[0018] The embodiment of the present invention discloses a preparation method of a copper-zinc catalyst, comprising the following steps: mixing 2-13 parts by weight of soluble copper salt, 2-4 parts by weight of soluble zinc salt and 1-3 parts by weight of starch, and grinding for the first time , and then adding 2-8 parts by weight of sodium carbonate and 1-3 parts by weight of starch, grinding for the second time, washing, drying, and calcining to obtain the copper-zinc catalyst.

[0019] As a preferred solution, the present invention uses starch as a pore-forming agent to effectively increase the specific surface area of ​​the CuO-ZnO catalyst, and the preparation process is quick and easy with good reproducibility. The catalytic reaction prepared by the invention is environmentally friendly to chromium, and realizes environmental protection, energy saving and emission reduction.

[0020] As a preferred version, the soluble copper salt is preferably Cu(NO 3 ) 2 ·3H 2 O, ...

Embodiment 1

[0033] Weigh 2.44g of copper nitrate solid, 3g of zinc nitrate solid, 1.8g of starch, pour into the agate grinding body and grind for 1min, then add 2.12g of sodium carbonate solid and 1.8g of starch to continue grinding for 1h at normal temperature, after the grinding is completed, use Repeated washing with deionized water at 60°C, and then moving the solid into an oven at 120°C to dry for 12 hours, and finally calcining in a calciner at 350°C for 3 hours to obtain a CuO-ZnO catalyst, Catalyst 1, with a BET of 156m through physical adsorption analysis. 2 / g.

Embodiment 2

[0035] Weigh 7.24g of copper nitrate solid, 3g of zinc nitrate solid, 1.8g of starch, pour into the agate grinding body and grind for 1min, then add 4.24g of sodium carbonate solid and 1.8g of starch to continue grinding for 1h at normal temperature, after the grinding is completed, use Repeated washing with deionized water at 60°C, and then moving the solid into an oven at 120°C to dry for 12 hours, and finally calcining in a calciner at 350°C for 3 hours to obtain a CuO-ZnO catalyst, Catalyst 2, with a BET of 178m through physical adsorption analysis. 2 / g.

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Abstract

The invention provides a preparation method of a copper and zinc catalyst. The preparation method comprises the following steps of: mixing 2-13 parts by weight of soluble copper salt, 2-4 parts by weight of soluble zinc salt and 1-3 parts by weight of starch; performing primary grinding; then adding 2-8 parts by weight of sodium carbonate and 1-3 parts by weight of starch; performing secondary grinding; and washing, drying and calcining the mixture to obtain the copper and zinc catalyst. Compared with the prior art, by taking starch as a pore forming material, the specific surface area of the copper and zinc catalyst is effectively increased, and the copper and zinc catalyst is relatively high in catalytic activity and difluoroethanol selectivity. The preparation process is rapid and simple and good in repeatability. The invention also provides an application of the copper and zinc catalyst in hydrogenation preparation of difluoroethanol by methyl difluoroacetate. The catalyst is environmental-friendly and realizes green and environmental-friendly and energy-saving and emission-reducing effects; and moreover, the conversion rate of methyl difluoroacetate is relatively high, and the selectivity of difluoroethanol is good.

Description

technical field [0001] The invention relates to the technical field of industrial catalysis, in particular to a preparation method and application of a copper-zinc catalyst. Background technique [0002] Fluoroalcohols are aliphatic fluorine-containing intermediates, widely used in pesticides, pharmaceutical synthesis, materials, dyes and other fields, and have very good development prospects, such as difluoroethanol, trifluoroethanol, hexafluorobutanol, etc. Important organic synthesis intermediates with added value. At present, the hydrogenation of methyl difluoroacetate to difluoroethanol mainly uses copper-based catalysts, and the commonly used preparation method is the precipitation method. [0003] In the prior art, Chinese patent CN102766024A1 discloses a method for preparing difluoroethanol, using difluoroacetate as raw material, using Cu-Mn-Ba as catalyst, and ethanol as solvent to prepare difluoroethanol under relatively high pressure Ethanol, the specific steps ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J35/10C07C29/149C07C31/38
CPCC07C29/149B01J23/002B01J23/80B01J35/615C07C31/38
Inventor 邢闯申东明程世林杨黎辉邬海亮冷彪许茂乾杨瑞芹椿范立
Owner 杭州催研科技有限公司
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