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Preparation method of hydrogenation

A hydrogenation catalyst and catalyst technology, applied in the chemical industry, can solve the problems of easy aggregation of active metals, affecting catalyst activity and product conversion rate, limited active metal loading, etc., saving water washing steps, saving water purification, and being conducive to dispersion. Effect

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the catalyst is prepared by impregnation, the active metals are easy to aggregate, and the loading of active metals is limited, which affects the activity of the catalyst and the conversion rate of the product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 302g Cu(NO 3 ) 2 . 3H 2 O, 401g Al(NO 3 ) 3 . 9H 2 O and 90g Zn(NO 3 ) 2 . 6H 2 O is configured into a 2000mL mixed solution, heated to 60°C, and an ammonia solution with a molar concentration of 4.98mol / L is prepared as a precipitant, and 200mL of clean water is added to the reaction tank, and the metal solution and the precipitant are co-precipitated by dripping. During the precipitation reaction, add OP-10 (the condensation product of diluent alkylphenol and ethylene oxide, the concentration is 3g / L) into the reaction tank, control the solid-liquid ratio of the reaction liquid to 1:15, and the pH value of the precipitation reaction 6.2, the precipitation reaction temperature is 60°C, after the dropwise addition, continue to stir and age at a constant temperature for 90 minutes, filter after the aging is over, dry the filter cake at 120°C for 4 hours, press the obtained material into tablets, and roast at 500°C After 4 hours, catalyst A1 was obtained, ...

Embodiment 2-3

[0029] The preparation process is the same as in Example 1, except that the solid-to-liquid ratio of the reaction solution is changed to 1:12.5, 1:17.5, and the diluent is changed to S-185 (the condensation product of fatty alcohol and ethylene oxide, the concentration is 3g / L ), prepared catalysts A2, A3, its analysis results are shown in Table 1.

Embodiment 4

[0031] The preparation process was the same as in Example 1, except that the precipitating agent was changed to ammonium carbonate (concentration: 5.25 mol / L), and the prepared catalyst A4 was analyzed in Table 1.

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Abstract

The invention discloses a preparation method of a hydrogenation catalyst. The preparation method comprises the following steps: subjecting an active metal solution and a precipitant to a parallel flow precipitation reaction, adding a diluent solution during the reaction process through a parallel flow method, and controlling a certain solid-to-liquid ratio during the reaction process to guarantee stable precipitation environment so as to generate crystal particles with a uniform size; thus the pore diameter distribution is more concentrated, and furthermore, the diluent is added to assist the dispersion of active metal so as to improve the activity and selectivity of the catalyst. The catalyst obtained through the method mentioned above is suitable for selective hydrogenation preparation of 1,4-butadiol from dimethyl maleate.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for preparing a hydrogenation catalyst, in particular to a method for preparing a hydrogenation catalyst for selective hydrogenation of dimethyl maleate to prepare 1,4-butanediol. Background technique [0002] 1,4-Butanediol is a widely used basic organic chemical and fine chemical raw material, mainly used in the production of tetrahydrofuran, polydibutyl terephthalate (PBT), γ-butyrolactone and polyurethane (PU ). In recent years, due to the rapid growth of demand for thermoplastic elastic fibers and elastomers, the demand for monomers PTMEG (polytetramethylene ether glycol) and PTMG (polytetrahydrofuran ether) is strong, making the upstream raw material 1,4-butanediol Demand is also growing rapidly, and major 1,4-butanediol producers in the world, such as BASF and SISAS, have expanded their capacity one after another. [0003] There are many...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J23/889C07C31/20C07C29/149
Inventor 付秋红高鹏张艳侠段日包洪洲
Owner CHINA PETROLEUM & CHEM CORP
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