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Catalyst for benzene ring hydrogenation of terephthalic acid or dimethyl terephthalate

A technology of dimethyl phthalate and terephthalic acid, which is applied in the field of catalysts for the hydrogenation of aromatic carboxylic acids or aromatic esters to achieve the effects of mild hydrogenation reaction conditions, good reactivity, and long service life

Inactive Publication Date: 2007-02-21
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a catalyst for the hydrogenation of benzene rings of terephthalic acid or dimethyl terephthalate, and the technical problem to be solved is that the active components of the catalyst do not use the more expensive rare metal Pd Under the premise, the catalyst is required to have higher product selectivity and higher reactivity, so as to overcome the defects existing in the prior art

Method used

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  • Catalyst for benzene ring hydrogenation of terephthalic acid or dimethyl terephthalate

Examples

Experimental program
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Effect test

Embodiment 1

[0016] 2gRuCl 3 ·xH 2 O (about 37% Ru) was dissolved in 325ml deionized water to make an impregnating solution, stirred and heated to 60°C, and 20% sodium hydroxide solution was added to adjust the pH value of the impregnating solution to 8. Add 14.3g carrier Al 2 o 3 Powder, continue stirring for 10 minutes. Cool to room temperature and stand for 0.5 hours, add 9.2g of 36% formaldehyde solution dropwise, stir for 1 hour, let stand for 0.5 hours, filter, and wash with deionized water 4 times to obtain the finished catalyst. The particle size of the catalyst is 80-200 head.

Embodiment 2

[0018] Change RuCl 3 ·xH 2 O and carrier Al 2 o 3 The consumption of adding 30% ammonium bicarbonate solution is adjusted to 5 by the dipping liquid pH value, and all the other are with embodiment 1.

Embodiment 3

[0020] Change RuCl 3 ·xH 2 O and carrier Al 2 o 3 The consumption of adding 20% ​​sodium carbonate solution is adjusted to be 8 by the dipping liquid pH value, all the other are with embodiment 1.

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Abstract

A catalyst for hydrogenating the benzene ring of terephthalic acid or dimethy terephthalate is prepared from Ru as active component and Al2O3 as carrier through dissolving the soluble salt of Ru in deionized water,regulating pH=4-10, immersing Al2O3 in it for 0.5-5 hr, adding formaldehyde solution, reductive reaction, filtering and washing.

Description

technical field [0001] The invention relates to a catalyst for hydrogenation of aromatic carboxylic acid or aromatic ester benzene ring, in particular to a catalyst for hydrogenation of aromatic carboxylic acid or aromatic ester benzene ring with metal Ru as an active component. Background technique [0002] Selective hydrogenation of benzene rings is an important method for preparing cyclohexane compounds from aromatic compounds, such as 1,4-cyclohexanedicarboxylic acid and terephthalic acid dicarboxylic acid produced by hydrogenation of benzene rings from phthalic acid 1,4-Dimethyl cyclohexanedicarboxylate can be obtained by hydrogenation of methyl ester through benzene ring. 1,4-cyclohexanedicarboxylic acid and dimethyl 1,4-cyclohexanedicarboxylate can be respectively hydrogenated by carboxyl group and ester hydrogenated to produce 1,4-cyclohexanedimethanol. The latter is an important organic chemical raw material for the production of polyester resin. The polyester resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/48C07C51/36C07C61/09
Inventor 朱志庆吕自红李斌谢家明
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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