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Hydrogenation catalyst for producing dimethyl succinate and method for preparing hydrogenation catalyst for producing dimethyl succinate

A technology of dimethyl succinate and hydrogenation catalyst, which is applied in the direction of carboxylate preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, etc., which can solve the short service life of catalyst and improve production Cost, affecting production efficiency and other issues, to achieve high activity, improve service life, and inhibit side reactions

Inactive Publication Date: 2015-01-07
KAIRUI ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned patented technologies all have the shortcoming that the service life of the catalyst is short, and after coke is accumulated on the surface of the catalyst, the catalyst will quickly deactivate. Frequent replacement of the catalyst will affect the production efficiency and increase the production cost. Therefore, how to prolong the service life has become an urgent need to be solved. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Resin-based spherical activated carbon, produced by Shanxi Cuihong Technology Co., Ltd.

[0018] The ball diameter is 0.3-1.2mm, the specific surface area (BET) is 950-1200(m2 / g), and the pore volume is 0.6-0.75ml / g.

[0019] 1). Loading operation of palladium nitrate

[0020] Soak the resin-based spherical activated carbon in an ethanol solvent for 4 hours, add palladium nitrate accounting for 2% of the mass percentage of the resin-based spherical activated carbon, react at 15°C for 15 hours, wash with ethanol, and dry to obtain a resin-based carbon catalyst loaded with palladium nitrate, namely the intermediate Product 1.

[0021] 2). Liquid phase sedimentation method to load WO 3 :

[0022] Sodium tungstate is dissolved in oxalic acid solution to prepare a solution with a mass percentage concentration of 30%. Put the intermediate product 1 into the reaction kettle, add sodium tungstate oxalic acid solution accounting for 3% of the mass percentage of the intermedia...

Embodiment 2

[0024] In step 1, add palladium nitrate accounting for 0.5% of the mass percentage of resin-based spherical activated carbon, and the others are the same as in Example 1. The resulting product number is KRB-2.

Embodiment 3

[0026] In step 1, add palladium nitrate that accounts for 5% of the resin-based spherical activated carbon mass percentage, and the others are the same as in Example 1. The resulting product number was KRB-3.

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Abstract

The invention provides a method for preparing hydrogenation catalyst for producing dimethyl succinate. According to the method, Resin ribbon ball-shaped active carbon having high specific surface area and a micro-hole structure serves as the carrier, palladium nitrate loading is carried out according to a liquid phase deposition method, WO3 loading is then carried out, washing, drying and roasting are then carried out, and the hydrogenation catalyst is generated. WO3 provides proper weakly acidic active sites for the catalyst, and therefore high activity and high selectivity of the catalyst can still be kept after long-period operation and the service life of the hydrocarbon catalyst can be prolonged.

Description

technical field [0001] The invention relates to a hydrogenation catalyst and a preparation method thereof, in particular to a preparation method of a hydrogenation catalyst for producing dimethyl succinate. technical background [0002] Dimethyl succinate (also known as dimethyl succinate) is an important synthetic flavor and food additive, which can be used as a food preservative. At the same time, it is also an important chemical intermediate, using excess dimethyl succinate as a solvent and methanol as a co-solvent to make dimethyl succinate react with sodium methoxide to prepare dimethyl succinate . Dimethyl succinyl succinate (DMSS) is an important intermediate in the synthesis of quinacridone pigments (Quiacridone). At present, in the industry, dimethyl succinate (DMS) is used as a raw material to produce it through the synthesis route of self-condensation reaction. At present, dimethyl succinate is mainly obtained from succinic acid and methanol as raw materials, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/652C07C69/40C07C67/303
Inventor 张勇王金明
Owner KAIRUI ENVIRONMENTAL PROTECTION TECH