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Selective hydrogenation catalyst of aromatic aldehydes for refinement of terephthalic acid

A technology of terephthalic acid and hydrogenation catalysts, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, organic chemistry, etc., can solve the problem of low water solubility and hydrogen consumption of P-TA Large size, high separation energy consumption and other problems, to achieve the effect of reducing operating costs and energy consumption, reducing investment costs, and simplifying the process

Active Publication Date: 2009-01-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the P-TA produced by hydrogenation of 4-CBA existing in the prior art has less water solubility, large hydrogen consumption, and high energy consumption for separation. Selective Hydrogenation Catalyst for Purification of Diformic Acid

Method used

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  • Selective hydrogenation catalyst of aromatic aldehydes for refinement of terephthalic acid
  • Selective hydrogenation catalyst of aromatic aldehydes for refinement of terephthalic acid

Examples

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Embodiment 1

[0032] Weigh 50 grams of 4-8 mesh, flake-shaped coconut shell activated carbon, with a specific surface of 1078m 2 / g, the pore volume is 0.47ml / g. After removing the dust adsorbed on the carbon surface and the loose parts on the surface, pickle with 0.5N nitric acid in a washing tank at a washing temperature of 100°C for 1 hour, and then wash with deionized water until neutral. and dried at 120° C. for 2 hours before use. Take by weighing 0.5 gram of palladium-containing 20% ​​chloropalladic acid solution, then add 4.05 gram of NiCl 2 .6H 2 O, then add an appropriate amount of surfactant and sodium carbonate, and finally add deionized water to dilute to the amount of the solution just submerged gac carrier is advisable. The catalyst active component solution is impregnated with the carrier, aged for 24 hours, then reduced with hydrogen, then washed with pure water until neutral and dried to obtain a catalyst product.

Embodiment 2

[0034] Catalyst preparation process and evaluation conditions are the same as in Example 1, wherein 0.75 gram of palladium-containing 20% ​​chloropalladium acid solution is weighed, and the nickel added is 4.94 gram of Ni(NO 3 ) 2 .6H 2 O.

Embodiment 3

[0036] Catalyst preparation process and evaluation condition are the same as embodiment 1, and the nickel that adds is 1.06 gram Ni (CH 3 COO) 2 4H 2 O.

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Abstract

The invention relates to a selective hydrogenation catalyst of aromatic aldehydes for refining of terephthalic acid. The selective hydrogenation catalyst is mainly used for solving the problems that the hydrogenation of 4-carboxy-benzaldehyde (called as 4-CBA for short) in the prior art mainly generates p-toluic acid (referred to as P-TA), the amount of hydrogen consumption is great and the operation cost is high. The selective hydrogenation catalyst adopts activated carbon as a carrier and is supported with one or more metals of palladium, ruthenium, nickel, zinc and copper, and the like; therefore, the technical proposal can better solve the problems and can be used in the industrial production for hydrogenation refining of the terephthalic acid.

Description

technical field [0001] The invention relates to an aromatic aldehyde selective hydrogenation catalyst used for refining terephthalic acid. In particular, it relates to a selective hydrogenation catalyst for generating p-hydroxymethylbenzoic acid (4-HMBA) through the selective hydrogenation of aromatic aldehydes in the refining process of 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-hydroxymethylbenzoic acid (4-CBA) in crude terephthalic acid are hydrogenated and converted into other compounds, the crystallized method to separate and purify. In industrial production, the hydrogenation of 4-CBA in crude terephthalic acid mainly produces P-TA and contains a very small amount of 4-HMBA. [0003] As an important monomer, 4-HMBA is used in the synthesis of the corresponding homopolymer, poly-tere-benzoate or the corresponding ester, polymethyl-p...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J23/46B01J21/18C07C47/54C07C45/41
Inventor 畅延青姜瑞霞孙广斌朱小丽
Owner CHINA PETROLEUM & CHEM CORP
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