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Nieuwland catalyst as well as preparation method and application thereof

A technology of catalyst and buffering agent, which is applied in the field of catalyst preparation, can solve the problems such as the decrease of vinyl acetylene yield, and achieve the effects of simplified process, strong activation ability, acetylene conversion rate and vinyl acetylene selectivity stability

Active Publication Date: 2013-09-11
ANHUI ANQING SHUGUANG CHEM GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the acetylene dimerization reaction, the HCl in the catalyst will be continuously taken out of the reactor along with the acetylene gas flow, and it is usually necessary to compensate the lost HCl by adding hydrochloric acid to maintain the weak acidity of the Nieuwland catalyst, however, a slight excess of hydrochloric acid will will lead to a sharp drop in the yield of vinyl acetylene
[0004] Therefore, the current Nieuwland catalyst still needs to be improved

Method used

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  • Nieuwland catalyst as well as preparation method and application thereof
  • Nieuwland catalyst as well as preparation method and application thereof
  • Nieuwland catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Measure 55ml of deionized water and pour it into a two-neck flask, add 30g of NH to it after heating to 60°C 4 Cl, 55g CuCl and a magnetic stirring rotor, and then the two-necked flask was placed in a constant temperature water bath (60°C constant temperature) on the magnetic stirrer, and the rotating speed was maintained at 1000-1300 rpm, and nitrogen gas was introduced into the two-necked flask at the same time. Treat CuCl and NH 4 After Cl completely dissolved, add buffering agent---the mixed solution of ammonium acetate and acetic acid in the two-necked flask, measure the pH of catalyst while adding, stop adding buffering agent after pH is 5.8, and continue to stir for 30 minutes, so that obtain required Nieuwland Catalyst.

Embodiment 2

[0030] According to the preparation method of Example 1, the Nieuwland catalyst was prepared. Wherein, the difference from Example 1 is: no buffering agent is added.

Embodiment 3

[0032] According to the preparation method of Example 1, the Nieuwland catalyst was prepared. Wherein, the difference from Example 1 is: the buffering agent added in the two-necked flask is a mixture of phosphoric acid and sodium dihydrogen phosphate.

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Abstract

The invention provides a Nieuwland catalyst as well as a preparation method and an application thereof. The Nieuwland catalyst comprises the following components in parts by weight: 20 to 40 parts of CuCl as an active component and 1 to 20 parts of buffering agent, wherein the pH value of catalyst is kept within the range of 4.5 to 6.8 through the buffering agent. The Nieuwland catalyst has the good stability in an acetylene dimerization reaction, so that the Nieuwland catalyst can be efficiently applied to the production of vinyl acetylene.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation. In particular, the present invention relates to Nieuwland catalysts and their preparation and use. More specifically, the present invention provides a Nieuwland catalyst, a method for preparing Nieuwland catalyst, a method for preparing vinylacetylene and a vinylacetylene product. Background technique [0002] Vinyl acetylene is the main raw material for the production of neoprene monomer chloroprene, and can also be used in the production of important chemical products such as 4-chlorophthalic anhydride, diacetylbenzene, benzene, and styrene. Therefore, it is of great significance to efficiently produce vinyl acetylene. [0003] In the current price segment, the industry mainly produces vinyl acetylene through acetylene dimerization reaction using Nieuwland catalyst. During the dimerization of acetylene, the Nieuwland catalyst needs to maintain a weak acidity. The current Nieuwla...

Claims

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Application Information

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IPC IPC(8): B01J31/30B01J27/122C07C11/30C07C2/38
Inventor 韩明汉刘建国左宜赞汪展文
Owner ANHUI ANQING SHUGUANG CHEM GRP
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