Preparation method of crude terephthalic acid hydrogenation catalyst

A technology of crude terephthalic acid and hydrogenation catalyst is applied in the preparation of organic compounds, the preparation of carboxylate, chemical instruments and methods, etc. The effect of improved performance

Active Publication Date: 2010-07-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that there are problems of poor metal Pd dispersion and low crystal

Method used

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  • Preparation method of crude terephthalic acid hydrogenation catalyst
  • Preparation method of crude terephthalic acid hydrogenation catalyst
  • Preparation method of crude terephthalic acid hydrogenation catalyst

Examples

Experimental program
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Effect test

Example Embodiment

[0020] [Example 1]

[0021] Weigh 50 grams of 4-8 mesh, flaky coconut shell activated carbon, with a specific surface area of ​​1078 square meters / g and a pore volume of 0.47 ml / g. After removing the adsorbed dust and surface loose parts on the carbon surface, the activated carbon was pre-impregnated with a tartaric acid solution with a concentration of 0.1 mol / g at room temperature for 15 minutes, then filtered, and dried at 120°C for 2 hours. Weigh 1.25 grams of palladium-containing 20% ​​chloropalladic acid solution, and then add an appropriate amount of surfactant and sodium carbonate to it, adjust the pH of the solution to 5.5, and then add deionized water until the amount of the solution just immerses the activated carbon carrier . The catalyst active component solution is impregnated into the carrier, aged for 24 hours and then reduced with sodium formate solution, then washed with pure water to neutrality and dried to obtain a catalyst product. The initial activity of t...

Example

[0022] [Examples 2-9]

[0023] The catalyst was prepared according to the steps and operating conditions of Example 1, except that the type of prepreg solution, solution concentration, immersion temperature, immersion time, and drying temperature were changed. See Table 1 for details. The physical properties and evaluation results of the prepared catalysts are shown in Table 2. .

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Abstract

The invention relates to a preparation method of a crude terephthalic acid hydrogenation catalyst, mainly solving the problems that metal Pd in the catalyst has poor dispersion and low crystallite content in the prior art. Through the technical scheme comprising the following steps of: pre-impregnating an active carbon carrier with organic acid and organic acidic salt, filtering and drying the active carbon carrier, loading an active component of the metal Pd, finally adding a reducing agent for reducing and washing to obtain a finished catalyst, the invention better solves the problems and can be applied to the industrial production of hydrorefining crude terephthalic acid.

Description

technical field [0001] The invention relates to a preparation method of a crude terephthalic acid hydrogenation catalyst, in particular to a preparation method of a supported palladium / carbon catalyst used for refining crude 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-carboxybenzaldehyde (4-CBA for short) in crude terephthalic acid are hydrogenated into other compounds, the method of crystallization is subsequently adopted. to separate and purify. Since the palladium / carbon catalyst adopts a single active component, the dispersion and distribution of metal palladium on the carrier has a great influence on the performance of the catalyst. [0003] Since the reaction process of terephthalic acid hydrofining is a first-order reaction, the reaction speed is fast, and it is difficult for the reactants to penetrate into the interior of the catal...

Claims

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Application Information

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IPC IPC(8): B01J23/42C07C51/487C07C63/331
CPCY02P20/52
Inventor 姜瑞霞畅延青孙广斌朱小丽
Owner CHINA PETROLEUM & CHEM CORP
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