Catalyst for synthesizing oxalate by CO coupling reaction and preparation method thereof

A coupling reaction and catalyst technology, which is applied to the catalyst for synthesizing oxalate by CO coupling reaction and its preparation, in the field of catalysts, can solve the problems of high cost, long production process and high production cost of oxalate, so as to reduce the usage amount , the outer specific area increases, the effect of strengthening the transmission

Active Publication Date: 2012-11-21
PUJING CHEM IND SHA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxalic acid, the main raw material for the synthesis of oxalate, is currently produced by the sodium formate method; this method has a long production process and high cost; resulting in high production costs of oxalate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A kind of preparation method for the wire mesh skeleton catalyst of synthesizing dimethyl oxalate, comprises the following steps:

[0034] (1) Select an alloy steel wire mesh with a hole size of 40 mesh, first stamp it into a corrugated shape through a punching machine, and then roll it into a catalyst metal skeleton with a height of 10 cm and a diameter of 2.5 cm through a rolling machine.

[0035] (2) After fully mixing the pseudo-boehmite and the silica sol at a mass ratio of 10:1, the colloid for coating the carrier coating is prepared, and the pH value of the coating colloid is controlled at 3.

[0036] (3) Coating the coating colloid on the wire mesh skeleton by dipping method. The coated metal skeleton is baked at 1200° C. for 5 hours, so that the carrier coating is firmly attached to the surface of the wire mesh skeleton.

[0037] (4) PdCl 2 , ZrCl 2 Prepare a palladium nitrate solution with water, and adjust the pH value of the precursor solution to 10 with ...

Embodiment 2

[0047] A kind of preparation method of the catalyst that is used for CO coupling reaction synthesis oxalate, the method comprises the following steps:

[0048] (1) Preparation of wire mesh skeleton: punch and roll alloy steel mesh that can withstand a temperature exceeding 1000°C into a rectangular parallelepiped metal skeleton, and the aperture of the alloy steel mesh is 5 mesh;

[0049] (2) Preparation of washcoat colloid: dissolve pseudoboehmite in deionized water to make washcoat colloid for coating, and the pH value of the coat colloid is adjusted by dilute nitric acid with a concentration of 0.1mol / L is 6;

[0050] (3) Coating of the carrier coating: the coating colloid is coated on the wire mesh skeleton by dipping method, and the coated metal skeleton is baked at 1200°C for 1 hour, so that the carrier coating is firmly attached to the wire mesh On the surface of the network skeleton, the mass fraction of the mass of the carrier coating in the mass of the entire cataly...

Embodiment 3

[0055] A kind of preparation method of the catalyst that is used for CO coupling reaction synthesis oxalate, the method comprises the following steps:

[0056] (1) Preparation of wire mesh skeleton: stamping and rolling alloy steel mesh that can withstand a temperature exceeding 1000°C into a triangular prism-shaped metal skeleton, the aperture of the alloy steel mesh is 5 mesh to 100 mesh;

[0057] (2) Preparation of carrier coating colloid: silica sol and titanium oxide powder are mixed and dissolved in deionized water in a mass ratio of 5:1 to make carrier coating colloid for coating, and the passing concentration of coating colloid is 0.2 The dilute hydrochloric acid of mol / L adjusts its pH value to be 2;

[0058] (3) Coating of the carrier coating: the coating colloid is coated on the wire mesh skeleton by the dipping method, and the coated metal skeleton is baked at 1200°C for 1 to 8 hours, so that the carrier coating is firmly attached to the On the surface of the wire...

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Abstract

The invention relates to a catalyst for synthesizing oxalate by a CO coupling reaction and a preparation method thereof; the catalyst adopts metal wire mesh as a skeleton; a carrier coating is coated on the surface of the metal wire mesh; the carrier coating is loaded with active components and additives on the surface. Compared with the prior art, with the proviso that the catalytic activity is maintained to be the same, the catalyst of the invention greatly reduces the precious metals active component using amount per unit volume of the catalyst, significantly reduces the pressure drop of a catalyst bed layer, effectively decreases the radial temperature difference of the catalyst bed layer, improves the heat shift problem during the reaction process, and solves the problem of easy temperature jump when a traditional honeycomb catalyst is used in the reaction system.

Description

technical field [0001] The invention relates to a catalyst in the field of organic synthesis, in particular to a catalyst for synthesizing oxalate by CO coupling reaction and a preparation method thereof. Background technique [0002] Oxalate is an important chemical raw material. A variety of chemicals can be obtained from oxalate esters, such as oxalic acid, ethylene glycol, oxalic acid amide, etc. [0003] At present, the dehydration esterification of oxalic acid and alkyl alcohol is the main method of producing oxalate. Oxalic acid, the main raw material for the synthesis of oxalate, is currently produced by the sodium formate method; this method has a long production process and high cost; resulting in high production costs of oxalate. There is an urgent need to find a new production process. Contents of the invention [0004] The object of the present invention is exactly to provide a kind of active high, good stability, low cost catalyst and preparation method th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J23/63B01J23/89B01J35/10C07C69/36C07C67/36
CPCC07C67/36B01J23/63B01J35/10B01J23/89B01J23/44B01J23/894B01J21/04B01J23/745B01J23/8906C07C69/36
Inventor 计扬骆念军毛彦鹏张博
Owner PUJING CHEM IND SHA
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