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

A coupling reaction and catalyst technology, applied in the direction of carbon monoxide or formate reaction preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of high production cost, high cost and long production process of oxalate , to achieve the effects of strengthening transmission, reducing usage, and increasing external specific area

Active Publication Date: 2014-08-20
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

Provided are a catalyst for synthesizing oxalate through a CO coupling reaction and a preparation method therefor. The catalyst has a metal mesh as a framework, a layer of carrier coating is applied on a surface of the metal mesh, and an active component and an additives are loaded on a surface of the carrier coating. By using the catalyst, under the precondition that the activity is ensured, the amount of noble metal active components per unit volume of the catalyst is reduced, the pressure drop of the catalyst bed is decreased, and the radial temperature of the catalyst bed is lowered, thereby solving the problem of heat transfer in the reaction process and temperature runaway that easily occurs when a conventional 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 Patents(China)
IPC IPC(8): B01J23/44B01J23/63B01J23/89B01J35/10C07C69/36C07C67/36
CPCB01J23/63B01J21/04B01J23/894B01J23/44C07C67/36B01J23/8906B01J23/745
Inventor 计扬骆念军毛彦鹏张博
Owner PUJING CHEM IND SHA
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