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Selective hydrogenation for preparing hexabydrobenzoic acid from benzoic acid

A technology of hexahydrobenzoic acid and benzoic acid, applied in the direction of ozone oxidation to prepare carboxylic acid, organic chemistry, etc., can solve the problem of less research

Inactive Publication Date: 2005-04-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In a word so far, the research on the technology and catalyst of preparing hexahydrobenzoic acid by selective hydrogenation of benzoic acid is all less, especially the method of using fixed bed reactor to carry out hydrogenation of benzoic acid to prepare hexahydrobenzoic acid has no relevant literature to report

Method used

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  • Selective hydrogenation for preparing hexabydrobenzoic acid from benzoic acid

Examples

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Effect test

example 1

[0024] Prepare the catalyst used in the present invention

[0025] (1) Preparation of carrier: Take 100 grams of CI hydrated alumina powder (manufactured by Condea, Germany), whose physical and chemical properties are shown in Table 1. Add 1.0 g of Squatia powder to the above-mentioned hydrated alumina powder and mix evenly, then add 50 ml of dilute nitric acid with a concentration of 3% by volume, stir and knead, then extrude into strips with an outer diameter of 1 mm, dry at 120°C for 2 hours, cut off Grow strips with a length of 2-3 mm, and bake at 850° C. for 4 hours to obtain carrier a, whose physical and chemical properties are shown in Table 2. The specific surface and pore volume in the physical and chemical properties are determined by low-temperature nitrogen adsorption BET method, and the number of acid centers is determined by NH 3 - Determination by TDP method (see "Zeolite Catalysis and Separation Technology", edited by Gao Zi et al., P19, China Petrochemical Pr...

example 2～5

[0034] This example is the benzoic acid selective hydrogenation activity experiment of catalyst.

[0035] Catalysts A, B, C, and D were evaluated for hydrogenation activity in a 20 ml fixed-bed reactor. Get 10 grams of catalyst and pack it into the reaction tube, raise the bed temperature to 180°C, pass hydrogen, the molar ratio of hydrogen to benzoic acid is 5:1, the reaction pressure is 1.0MPa, and the space velocity is 2 hours -1 ,use figure 1 The shown fixed bed reactor was used for trickle bed reaction, and the reaction results are shown in Table 4.

example 6

[0037] Catalyst A was placed in a 20 ml fixed-bed reaction device, and evaluation tests were carried out under different reaction conditions. The results are shown in Table 5.

[0038] instance number

[0039] example

[0040] instance number

[0041]

[0042] Reaction conditions

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Abstract

A process for preparing hexahydrobenzoic acid by selectively hydrogenating benzoic acid features the trickle-bed reaction between hydrogen gas, liquid benzoic acid and hydrogenating catalyst in fixed-bed reactor at 160-220 deg.C, 0.5-4 MPa and 0.1-15 / hr. Said catalyst is the weakly acidic alumina carrying Pt as active component. Its advantage is high catalytic activity and selectivity.

Description

technical field [0001] The invention relates to a method for preparing hexahydrobenzoic acid through selective hydrogenation of benzoic acid, specifically, contacting benzoic acid with hydrogen and preparing hexahydrobenzoic acid in the presence of a selective hydrogenation catalyst. Background technique [0002] At present, the industrial production of caprolactam mainly uses benzene as raw material, and there is also the technology of using toluene as raw material to produce caprolactam. The latter has certain advantages for factories with relatively more toluene raw materials. The selective hydrogenation of benzoic acid to produce hexahydrobenzoic acid is an intermediate reaction process for the production of caprolactam from toluene. Benzene hydrogenation is non-selective hydrogenation. The literature Hydrocarbon Processing, 58(11), 149-150, (1979) reports that the catalyst is Ni catalyst or Pt / alumina catalyst, and tubular or fixed-bed reactors are mostly used. Compar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/36C07C61/08
Inventor 钟进郝玉芝王志强桂寿喜
Owner CHINA PETROLEUM & CHEM CORP
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