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Application of ruthenium palladium/carbon catalyst

A carbon catalyst and catalyst technology, applied in the direction of physical/chemical process catalysts, heterogeneous catalyst chemical elements, metal/metal oxide/metal hydroxide catalysts, etc., can solve uneconomical production, high hydrogenation operating pressure, etc. problems, to achieve the effects of no three wastes discharge, improved surface properties, and high dispersion

Inactive Publication Date: 2014-04-09
JIANGSU GOLD BRIDGE SALT & CHEM GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Patents US3334149, US3334149, and CN1099382 applied by U.S. Eastman Corporation all describe the method for preparing 1,4-cyclohexanedicarboxylate as raw material with dimethyl terephthalate, and the palladium / alumina catalyst used ( Palladium loading 0.5-1%) is constantly improving, but the pressure used is greater than 6.0MPa, and the higher operating pressure of hydrogenation is uneconomical in production

Method used

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  • Application of ruthenium palladium/carbon catalyst
  • Application of ruthenium palladium/carbon catalyst
  • Application of ruthenium palladium/carbon catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0045] (1) Take 20g of self-made mesoporous carbon as the carrier material, place it in 80ml of 5mol / L nitric acid aqueous solution, immerse in a water bath at 80°C for 12h, cool, filter, wash with water until neutral, and dry; Lower degassing treatment for 2h;

[0046] (2) be 5.00% by active component ruthenium load capacity, palladium load capacity be 0.05% configure the ruthenium chloride solution of 3mol / L and the palladium chloride solution of 1.0mol / L respectively;

[0047] (3) The acid-treated mesoporous carbon was impregnated with ruthenium solution for 4 hours by vacuum equivalent impregnation method, dried at 80°C for 4 hours, and dried at 120°C for 6 hours; impregnated with palladium solution by the same method, stood in a water bath at 80°C for 4 hours, and dried at 80°C Dry 4h, obtain ruthenium palladium-carbon catalyst precursor;

[0048] (4) Use 10wt% NaOH aqueous solution to adjust the pH value to 11-12, precipitate for 2h, and let stand for 2h;

[0049] (5) ...

Embodiment 2

[0053] The same method as in Example 1 was used to prepare ruthenium-palladium / carbon catalysts with ruthenium and palladium loadings of 8.0% and 1.0%, respectively; the catalyst number was CAT-2 / MC.

Embodiment 3

[0055] The same method as in Example 1 was used to prepare ruthenium-palladium / carbon catalysts with ruthenium and palladium loadings of 3.0% and 0.1% respectively; the catalyst number was CAT-3 / MC.

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Abstract

The invention discloses application of a ruthenium palladium / carbon catalyst. A catalyst carrier is a carbon material; active components are Ru and Pd nano particles; the loading capacity of Ru is 0.5-8.0%; the loading capacity of Pd is 0.1-2.0%; the dispersity of ruthenium palladium can be up to 30-80%. The carrier is oxidized and pretreated by acid-base, so that an oxygen-containing functional group on the surface can be increased, the property of the ruthenium palladium at the surface of the carbon material is improved, the dispersity of the ruthenium palladium is improved, and the active components are firmly adsorbed on the foundational group, so that the catalyst displays high activity in the reaction process; the prepared catalyst is applied to hydrogenation preparation of cyclohexanedimethanol (DMCD) employing dimethyl terephthalate (DMT). The activity of the catalyst after being nested for 20 times is not reduced in a 5000ml of high-pressure kettle; the DMT transformation rate is 99.3-100%; the selectivity of the DMCD is 95.5-96.4%; the DMCD purity is greater than 99.5% by simple distillation and purification. Therefore, the ruthenium palladium / carbon catalyst is mild in technological condition, simple in equipment, free of three wastes emission, low in investment, low in energy consumption, and easy in achieving industrialization.

Description

technical field [0001] The invention relates to a high-activity and high-stability ruthenium-palladium / carbon catalyst for preparing DMCD by hydrogenation of DMT, its preparation and application, and belongs to the technical field of catalytic hydrogenation. Background technique [0002] Dimethyl terephthalate, referred to as DMT (Dimethyl terephthalate), is a white needle-like crystal with a melting point of 140.7°C and a boiling point of 284°C, and is easy to sublime. It is mainly used to synthesize polyester fiber, resin, film, polyester paint and engineering plastics, etc. The product of one-step hydrogenation of DMT is dimethyl 1,4-cyclohexanedicarboxylate (DMCD for short), and the product of two-step hydrogenation is 1,4-cyclohexanedimethanol (CHDM for short). [0003] DMCD is an important class of organic intermediates and green chemicals, which can be used as a polymer modification material and an important raw material for the production of CHDM. The high-performa...

Claims

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Application Information

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IPC IPC(8): C07C69/75C07C67/303B01J23/46
CPCC07C67/303B01J23/462B01J2523/821B01J2523/824C07C2601/14C07C69/75
Inventor 宋金文臧涵沈俭一申卫卫夏志潘少明
Owner JIANGSU GOLD BRIDGE SALT & CHEM GRP
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