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Palladium carbon catalyst for hydrofining crude terephthalic acid

A crude terephthalic acid, hydrogenation and refining technology, applied in the direction of catalyst protection, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of catalyst activity decrease, stability decrease, palladium Loss and other issues, to achieve the effect of reducing loss, improving stability, improving stability and life

Active Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the active component metal palladium in the catalyst existing in the prior art, which is distributed on the surface of the activated carbon and penetrates relatively shallowly. During use, the loss of palladium is caused by wear and tear, resulting in a decrease in catalyst activity and stability. problem, to provide a new catalyst for crude terephthalic acid hydrotreating

Method used

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  • Palladium carbon catalyst for hydrofining crude terephthalic acid
  • Palladium carbon catalyst for hydrofining crude terephthalic acid

Examples

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Embodiment 1

[0029] Weigh 50 grams of 4-8 mesh, flake-shaped coconut shell activated carbon, with a specific surface of 1100m 2 / g, the pore volume is 0.52ml / g. After removing the dust adsorbed on the surface and the loose parts on the surface, pickle with 0.5N nitric acid in a washing tank at a washing temperature of 80°C for 1 hour, and then wash with deionized water until neutral. and dried at 120° C. for 2 hours. Take by weighing 1.25 grams of palladium-containing 20% ​​chloropalladium acid solution, then add 0.1% potassium lauryl polyoxyethylene ether phosphate and 0.05% citric acid, and adjust the pH value of the solution with 10% sodium carbonate 5.5, then add deionized water until the amount of the solution just submerges the activated carbon carrier. The carrier is impregnated with the catalyst active component solution, aged for 24 hours, then reduced with sodium formate solution, then washed with pure water until neutral and dried to obtain a catalyst product. Dissolve 0.05% ...

Embodiment 2～15

[0031] Different fluorocarbon resins and fluorocarbon resins with different contents were selected and sprayed onto the surface of the catalyst. The preparation process of other catalysts was the same as in Example 1, and the specific contents were shown in Table 1.

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Abstract

The invention relates to a palladium carbon catalyst for hydrofining crude terephthalic acid. The catalyst provided by the invention is mainly used for solving the following problem in the prior art: the active component palladium in the palladium carbon catalyst positioned on the surface of the carrier can easily run off due to abrasion, so that the activity of the catalyst is reduced, thereby shortening the service life of the catalyst. The technical scheme is as follows: shaped cocoanut carbon is used as the carrier, the active component palladium is loaded on the cocoanut carbon, and fluorocarbon resin is loaded on the surface of the catalyst. By utilizing the technical scheme, the problem in the prior art is solved; and the palladium carbon catalyst for hydrofining crude terephthalic acid can be used for hydrofining crude terephthalic acid in an industrial production mode.

Description

technical field [0001] The invention relates to a catalyst used for hydrogenation refining of crude terephthalic acid. Background technique [0002] The supported palladium / carbon catalyst is suitable for the purification of crude terephthalic acid. After the impurities such as p-carboxybenzaldehyde (4-CBA for short) in crude terephthalic acid are hydrogenated into other compounds, the method of crystallization is subsequently adopted. to separate and purify. Since the palladium / carbon catalyst adopts a single active component, the distribution of metal palladium on the carrier has a great influence on the performance of the catalyst. [0003] Since the reaction process of terephthalic acid hydrofining is a first-order reaction, the reaction speed is fast, and it is difficult for the reactants to penetrate into the interior of the catalyst particle for reaction during the reaction process, which makes the active metal inside the particle due to steric hindrance. The molecu...

Claims

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Application Information

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IPC IPC(8): B01J23/44B01J33/00C07C63/26C07C51/487
Inventor 肖忠斌畅延青朱小丽孙广斌张绍金
Owner CHINA PETROLEUM & CHEM CORP
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