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Method for preparing 1,4 ¿C cyclohexanedicarboxylate

A technology for dimethyl cyclohexanedicarboxylate and dimethyl phthalate, applied in the field of selective hydrogenation of benzene rings in the presence of a catalyst for aromatic esters

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

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Problems solved by technology

[0004] The invention provides a method for preparing 1,4-cyclohexanedicarboxylate from dimethyl terephthalate through hydrogenation of benzene ring. The technical problem to be solved is that the catalyst active component used does not use The more expensive rare metal Pd, but still requires the reaction to have higher product selectivity, thereby overcoming the defects of the prior art

Method used

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  • Method for preparing 1,4 ¿C cyclohexanedicarboxylate

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Experimental program
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Embodiment 1

[0017] 2gRuCl 3 ·xH 2 O (about 37% Ru) was dissolved in 325ml deionized water to prepare 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

[0019] 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

[0021] 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

This invention discloses a method for preparing dimethyl 1,4-cyclohexane dicarboxylate by hydrogenation of dimethyl terephthalate in solvent in the presence of catalyst. The solvent is water or C1-4 fatty alcohol. The catalyst (80-200 mesh) is composed of Ru (0.5-10 wt. %) as the active component, and Al2O3 as the carrier. The weight ratio of dimethyl terephthalate to the solvent is 1: (0.5-10), while that of the catalyst to dimethyl terephthalate is 1: (5-20). The reaction is performed at 120-180 deg.C under 1.0-5.0 MPa for 0.5-8.0 h. Compared with present techniques, the method has such advantages as mild hydrogenation conditions, short hydrogenation time and long catalyst service time (recycleable for more than 9 times).

Description

technical field [0001] The invention relates to a method for selectively hydrogenating aromatic esters on benzene rings in the presence of a catalyst. Background technique [0002] Selective hydrogenation of benzene ring is an important method for preparing cyclohexane compounds from aromatic compounds, such as dimethyl phthalate through hydrogenation of benzene ring to obtain dimethyl 1,4-cyclohexanedicarboxylate . Dimethyl 1,4-cyclohexanedicarboxylate can be hydrogenated to produce 1,4-cyclohexanedimethanol, which is an important organic chemical raw material for the production of polyester resin, and it can replace ethylene glycol Polyester resins produced from polyols or other polyols have good thermal stability and thermoplasticity, and can maintain stable physical and electrical properties at higher temperatures, and have been more and more widely used. [0003] In the prior art, a catalyst with Pd as the active component for the selective hydrogenation of benzene ri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/75C07C67/303
CPCY02P20/584
Inventor 朱志庆吕自红谢家明霍金
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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