Composite carrier catalyst for aldol condensation and its preparation method and application

Abstract

The invention relates to a complex carrier catalyst for aldol condensation, and a preparation method and application of the complex carrier catalyst. The complex carrier catalyst is prepared by taking a composite carrier of SiO2 and TiO2 as a carrier, taking Cs as an active component and taking M as an active auxiliary agent; the complex carrier catalyst is prepared from 4-20% of the Cs, 0.05-10% of the M and the balance of the carrier by mass percent, wherein M is one or more selected from Na, K, Mg, Ca, Ba, La, Zr, Sr or Sb. Compared with the prior art, the complex carrier catalyst has good reaction activity and obviously delays coking; the preparation method remarkably improves the stability of the catalyst and is simple in preparation technology; the complex carrier catalyst can be used for preparing methyl methacrylate from formaldehyde and methyl propionate.

Description

technical field

[0001] The invention belongs to the technical field of catalysts, and relates to a composite carrier catalyst and a preparation method, in particular to a composite carrier catalyst for aldol condensation, a preparation method and an application. Background technique

[0002] Methyl methacrylate (MMA) is an important organic chemical raw material, also known as plexiglass monomer, widely used in the preparation of plexiglass, coatings, emulsion resins, adhesives, pharmaceutical polymer materials, leather treatment Agents and insulating potting materials, etc., with a wide range of product applications and market space.

[0003] According to different sources of raw materials, the main production methods of MMA are C 2 method (Alpha method), C 3 method (ACH method), C 4 method (isobutene / tert-butanol method). At present, the production method used in the production of MMA is mainly the ACH method. However, hydrocyanic acid, the raw material of ACH, is hig...