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Preparation methods and catalysis method of dimethyl maleate hydrogenation catalyst

A technology of dimethyl maleate and hydrogenation catalyst, which is applied in the chemical industry, can solve the problems of complex preparation process, complex process, and large equipment investment, and achieve good catalytic performance, reduced polymerization reaction, and low roasting temperature.

Inactive Publication Date: 2014-02-05
THE NORTHWEST RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above chromium oxide-free catalysts require high-pressure or multi-stage hydrogenation when preparing 1,4-butanediol, the process is complex, and the equipment investment is large; in addition, the catalyst components are complex and contain many additives. The process is complex and expensive

Method used

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  • Preparation methods and catalysis method of dimethyl maleate hydrogenation catalyst

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Experimental program
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Effect test

Embodiment 1

[0033] Step 1, 178.2g Cu(NO 3 ) 2 ·3H 2 O and 119.0g Zn(NO 3 ) 2 ·6H 2 O was dissolved in deionized water to make 1100mL mixed aqueous solution, and 137g Na 2 CO 3 Dissolve in deionized water to make a precipitant aqueous solution with a concentration of 1.6M, preheat the precipitant aqueous solution to 60°C, and then add dropwise to the preheated precipitant aqueous solution under the stirring condition of 300r / min. ℃ mixed aqueous solution to a pH value of 7.2±0.5, the amount of metered mixed aqueous solution is 1025mL, to obtain copper and zinc co-precipitation material;

[0034] Step 2, mix 14.5g pseudo-boehmite powder with 145mL deionized water evenly, then drop into the mixture a dilute nitric acid with a mass concentration of 5%, stir for 2h to obtain a pseudo-boehmite sol; The ratio of the mass of nitric acid to the mass of alumina in the pseudo-boehmite powder is 0.2:1; the specific surface area of ​​the pseudo-boehmite powder is >240m 2 / g, peptization index>...

Embodiment 2

[0038] Step 1, 151g Cu(NO 3 ) 2 ·3H 2 O and 185.33g Zn(NO 3 ) 2 ·6H 2 O was dissolved in deionized water to form a 2.5L mixed aqueous solution, and 210g NaHCO 3 Dissolve in deionized water to make a concentration of 0.5M precipitant aqueous solution, preheat the precipitant aqueous solution to 80°C, and then add dropwise to the preheated precipitant aqueous solution under the stirring condition of 300r / min. The mixed aqueous solution to pH value is 7.0, and the amount of metered mixed aqueous solution is 2080mL, obtains the coprecipitation material of copper and zinc;

[0039] Step 2, mix 12.3g pseudo-boehmite powder with 98.4mL deionized water evenly, then drop into the mixture a dilute nitric acid with a mass concentration of 3%, and stir for 3h to obtain a pseudo-boehmite sol; the dilute nitric acid The ratio of the mass of nitric acid in medium to the mass of alumina in pseudo-boehmite powder is 0.05:1; the specific surface area of ​​the pseudo-boehmite powder is >24...

Embodiment 3

[0043] Step 1, 151g Cu(NO 3 ) 2 ·3H 2 O and 185.33g Zn(NO 3 ) 2 ·6H 2 Dissolve O in deionized water to make a 2.5L mixed aqueous solution, dissolve 100g NaOH in deionized water to make a concentration of 0.5M precipitant aqueous solution, preheat the precipitant aqueous solution to 80°C, and then stir at 300r / min Add dropwise the mixed aqueous solution preheated to 80°C to the pH value of 7.0 into the preheated precipitant aqueous solution, and measure the amount of the mixed aqueous solution to 2080mL to obtain a coprecipitation material of copper and zinc;

[0044] Step 2, mix 6.3g pseudo-boehmite powder with 75.6mL deionized water evenly, then drop dilute nitric acid with a mass concentration of 10% into the mixture, stir for 2h to obtain pseudo-boehmite sol; the dilute nitric acid The ratio of the mass of nitric acid in medium to the mass of alumina in pseudo-boehmite powder is 0.05:1; the specific surface area of ​​the pseudo-boehmite powder is >240m 2 / g, peptizati...

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Abstract

The invention discloses a preparation method of a dimethyl maleate hydrogenation catalyst, which comprises the following steps: 1, preparing a copper and zinc coprecipitation material; 2, preparing pseudo-boehmite colloidal sol; 3, preparing a catalyst precursor from the coprecipitation material and the pseudo-boehmite colloidal sol or from the coprecipitation material, the pseudo-boehmite colloidal sol and pseudo-boehmite powder; and 4, drying, roasting, and tabletting to obtain the catalyst. The invention also discloses another preparation method which comprises the following steps: preparing a catalyst precursor by mixing a coprecipitation material and pseudo-boehmite colloidal sol, drying, roasting, then mixing with pseudo-boehmite powder, and tabletting or granulating to obtain the catalyst. Besides, the invention also discloses a method for realizing catalytic dimethyl maleate hydrogenation by using the catalyst. The proportion of the product can be adjusted according to market demands. According to the invention, the prepared catalyst is good in strength and low in roasting temperature, has favorable catalytic property and can effectively reduce occurrence of polymerization reaction in the reaction process at the same time.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method and a catalytic method of a dimethyl maleate hydrogenation catalyst. Background technique [0002] 1,4-Butanediol is an important organic chemical raw material that has developed rapidly in recent years. It is mainly used for the production of tetrahydrofuran. Tetrahydrofuran undergoes ring-opening polymerization to produce polytetramethylene ether glycol (a pharmaceutical intermediate or directly used as a solvent); Production of γ-butyrolactone; production of PBT resin for household appliances and color TV industries. In addition, due to its special structure, polyester or polyurethane synthesized from 1,4-butanediol has more balanced physical properties than polymers synthesized from ethylene glycol or propylene glycol. 1,4-Butanediol has a wide range of uses and has become an important basic organic chemical product. my country has...

Claims

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Application Information

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IPC IPC(8): B01J23/80B01J35/10B01J21/06C07C31/20C07C29/149C07D307/08C07D307/33
Inventor 王瑞宋庆锋高俊文潘蕊娟张勇高亚娜郭彦鑫裴婷曾清湖
Owner THE NORTHWEST RES INST OF CHEM IND
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