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Preparation method for trans-1,4-cyclohexanedimethanol, and catalyst used therefor

A technology of cyclohexanedimethanol and its production method, which is applied in the field of trans-1,4-cyclohexanedimethanol production and its catalyst, and can solve the problem of low selectivity

Active Publication Date: 2014-06-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the technical problems to be solved by the present invention is the selection of catalyst for trans-1,4-cyclohexanedimethanol in the preparation of 1,4-cyclohexanedimethanol by direct hydrogenation of terephthalic acid in the prior art In order to solve the problem of low stability, a catalyst for the production of trans-1,4-cyclohexanedimethanol is provided, which has the characteristics of high activity and selectivity

Method used

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  • Preparation method for trans-1,4-cyclohexanedimethanol, and catalyst used therefor
  • Preparation method for trans-1,4-cyclohexanedimethanol, and catalyst used therefor
  • Preparation method for trans-1,4-cyclohexanedimethanol, and catalyst used therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0013] Pretreatment of the carrier: reflux the activated carbon in a solution containing 35wt% nitric acid at 65°C for 3h. After the end, fully wash with deionized water until neutral, and then dry it in a vacuum oven at a constant temperature of 80°C for 12h, ready to use.

[0014] Catalyst preparation: First, weigh the corresponding mass of SnCl according to the Sn loading in the Pd-Pt-Sn-Cu / C catalyst is 3wt% and the Sn / Cu molar ratio is 1 2 and CuCl 2 And dissolve it in hydrochloric acid aqueous solution to form an impregnating liquid, mix the obtained impregnating liquid with 50 g of the above-mentioned pretreated activated carbon, impregnate for 12 h, filter, and dry at 120 ° C for 3 h to obtain the catalyst precursor I, and then follow the Pd-Pt- The content of Pt in the Sn-Cu / C catalyst is 1wt%, and the Pd-Pt heterobinuclear complex [PdPtCl 2 (PPh 2 py)] and dissolved in chloroform solution to form an impregnating solution, the resulting impregnating solution was mix...

Embodiment 2-5

[0016] The loading of Pt in the catalyst was changed without changing the Pd-Pt heterobinuclear complex, and the rest of the operations were the same as in Example 1. The Pt content in the catalyst obtained in each example is shown in Table 1.

Embodiment 6-14

[0018] The loading of Pt in the catalyst was not changed, but the Pd-Pt heterobinuclear complex was changed, and the remaining operations were the same as in Example 3. The Pd-Pt heterobinuclear complexes used in each example and the Pt content in the obtained catalyst are shown in Table 1.

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Abstract

The invention relates to a preparation method for trans-1,4-cyclohexanedimethanol, and a catalyst used therefor, mainly overcoming the problem that a catalyst has poor selectivity for trans-1,4-cyclohexanedimethanol in a conventional preparation method for 1,4-cyclohexanedimethanol by direct hydrogenation of terephthalic acid. By adopting a technical solution that takes activated carbon as a carrier, Pd and Pt as active components, Sn and Cu as auxiliary agents, wherein Pt content in the catalyst is 1-6 wt%; a molar ratio of Pd to Pt is 1:1; Sn content is 1-6 wt%; a molar ratio of Sn to Cu is 0.5-2; and Pd and Pt take Pd-Pt heterodinuclear complex as a precursor, the catalyst provided by the invention overcomes the above problem relatively well and can be used for industrial production of trans-1,4-cyclohexanedimethanol.

Description

technical field [0001] The invention relates to a production method of trans-1,4-cyclohexanedimethanol and a catalyst used therefor. Background technique [0002] 1,4-Cyclohexanedimethanol (CHDM for short) is an important organic chemical raw material for the production of polyester resin. The polyester resin produced by it instead of ethylene glycol or other polyols has good thermal stability and thermoplasticity, and can be used in Stable physical and electrical properties are maintained at higher temperatures, while products made from these resins have good chemical and environmental resistance. At present, the industrial production process of 1,4-cyclohexanedimethanol mainly uses dimethyl terephthalate as raw material, firstly hydrogenates benzene ring to prepare dimethyl 1,4-cyclohexanedicarboxylate, and then hydrogenates the ester The reaction produces 1,4-cyclohexanedimethanol. Due to the relatively low price and abundant sources of terephthalic acid (PTA), there ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C07C31/27C07C29/19C07C29/149
Inventor 朱庆才畅延青陈大伟
Owner CHINA PETROLEUM & CHEM CORP
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