Vatalyst for aldol condensation reaction as well as preparation method and application of catalyst

An aldol condensation reaction and catalyst technology, which can be used in catalyst activation/preparation, organic compound preparation, chemical instruments and methods, etc., can solve problems such as unsatisfactory catalyst activity and low MMA product yield, and achieve high industrial application value. , Improve the combination and dispersion, the effect of high product yield

Inactive Publication Date: 2020-01-17
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Studies have shown that among the various catalysts that catalyze the preparation of MMA by the aldol condensation reaction of methyl propionate and formaldehyde, the performance of the silica-supported Cs alkali metal catalyst is the best, but the catalyst activity is not ideal, and the yield of MMA products is still low. Low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Prepare 100mL of mixed acid solution with hydrofluoric acid and hydrochloric acid concentrations of 0.05mol / L and 0.5mol / L respectively, and 25g of SiO 2 After 1.0h, the acid-treated modified SiO 2 The carrier is fully rinsed with deionized water and dried before use;

[0046] (2) Dissolve 0.47g zirconium nitrate pentahydrate, 0.62g lanthanum nitrate hexahydrate, and 3.00g cesium nitrate into 100g deionized water, and weigh 20g acid-treated modified SiO 2 Carrier, mix the prepared salt solution with the carrier, impregnate and absorb, and dry at 150°C for 3 hours;

[0047] (3) The above-mentioned raw powder catalyst is fully mixed with 1g of safflower powder and 1g of graphite, and compressed into tablets;

[0048] (4) Drying at 150°C for 3 hours, and then calcining at 550°C for 8 hours to obtain a finished catalyst.

[0049] Catalyst activity test: Catalyst performance evaluation is carried out in a fixed-bed tubular reactor, the inner diameter of the reaction t...

Embodiment 2

[0054] (1) Prepare 100mL of hydrochloric acid with a concentration of 2.0mol / L, and 25g of SiO 2 After 2.0 hours, the acid-treated modified SiO 2 The carrier is fully rinsed with deionized water and dried before use;

[0055] (2) Dissolve 0.47g zirconium nitrate pentahydrate, 0.62g lanthanum nitrate hexahydrate, and 3.00g cesium nitrate into 100g deionized water, and weigh 20g acid-treated modified SiO 2 Carrier, mix the prepared salt solution with the carrier, impregnate and absorb, and dry at 150°C for 3 hours;

[0056] (3) The above-mentioned raw powder catalyst is fully mixed with 1g of safflower powder and 1g of graphite, and compressed into tablets;

[0057] (4) Drying at 150°C for 3 hours, and then calcining at 550°C for 8 hours to obtain a finished catalyst.

[0058] Catalyst activity test: Catalyst performance evaluation is carried out in a fixed-bed tubular reactor, the inner diameter of the reaction tube is 25mm, the catalyst loading capacity is 10g, and it is us...

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Abstract

The invention discloses a catalyst for an aldol condensation reaction as well as a preparation method and application of the catalyst. The catalyst includes an active component, an active auxiliary agent and a carrier, the active component is Cs, the carrier is an acid-treated modified SiO2 carrier, and the active auxiliary agent is one or more selected from the group consisting of P, V, W, Sn, B,Bi, Nb, Ba, La, Ti, Al, Sb, Ce, Zr and Fe. The preparation method comprises the following steps: performing acid treatment on SiO2 powder to obtain the acid-treated modified SiO2 carrier; supportingthe active component and an active auxiliary agent on the acid-treated modified SiO2 carrier to obtain a raw powder catalyst; and performing tabletting on the raw powder catalyst mixed with a shapingauxiliary agent to form a shaped catalyst, drying the shaped catalyst, and performing calcination to obtain the catalyst product. The catalyst is used for the condensation reaction of methyl acetate or methyl propionate with formaldehyde; and the yield of the product prepared by using the catalyst provided by the invention is higher, the costs of product separation can be significantly reduced, and the catalyst has higher industrial application value.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and more specifically relates to a catalyst that can be used to prepare methyl acrylate (MA) through the aldol condensation reaction of formaldehyde and methyl acetate and to prepare methacrylic acid through the aldol condensation reaction of formaldehyde and methyl propionate. Catalyst of methyl ester (MMA) and its preparation method and application. Background technique [0002] Methyl methacrylate (MMA) is an important organic chemical raw material, widely used in the production of organic glass (PMMA), PVC additives, coatings and other fields. In recent years, the global MMA production capacity has continued to grow, reaching nearly 5 million tons at present. China’s MMA consumption ranks first in the world, with an external dependence of over 60%, and an annual demand growth rate of more than 10%. It is the top ten products with the highest dependence on imports of organic chemicals. one....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J35/10B01J37/02C07C67/343C07C69/54
CPCB01J23/002B01J23/10B01J35/1019B01J35/1061B01J37/0207B01J2523/00C07C67/343C07C69/54B01J2523/15B01J2523/3706B01J2523/41B01J2523/48
Inventor 王光永鄢义李荣谌晓玲王莉陈晓华
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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