Recyclable compound solid acid catalyst and preparation method therefor

Abstract

The invention discloses a recyclable compound solid acid catalyst which is characterized by being prepared from the following raw materials in parts by weight: 30-40 parts of gamma-aluminum oxide, 8-12 parts of mullite, 40-60 parts of silicon dioxide, 13-16 parts of wood fiber, 17-20 parts of a pure acrylic emulsion, 1-3 parts of calcium sulfate, 2.1-3.4 parts of tea saponin, 15-18 parts of gamma-aminopropyltriethoxysilane and a proper amount of water. According to the catalyst disclosed by the invention, the mullite which is acidified on the surface by using a calcium sulfate aqueous solution is uniformly loaded to silicon dioxide to form stable Al-O-Si and Ca-O-Si covalent structures. The structure of SiO2 is not damaged in the loading process and the generated compound is relatively large in specific surface area. By adding the wood fiber particles which are adhered to the surface of aluminum oxide, the capacity of absorbing H<+> is improved and the prepared compound solid acid catalyst has the characteristics of being strong in acidity, high in selectivity, recyclable, long in service life and the like.

Description

technical field [0001] The invention relates to the technical field of solid acid catalysts, in particular to a recyclable composite solid acid catalyst and a preparation method thereof. Background technique [0002] 1,4-dioxane (1,4-dioxane), molecular formula C 4 h 8 o 2 , colorless liquid, slightly scented, density 1.0329, refractive index 1.4175, melting point 11°C, boiling point 101.1°C, miscible with water and many organic solvents, it is the preferred product of cellulose acetate, resin, vegetable oil, mineral oil, oil-soluble dyes, etc. Solvents are also used to make spray paints, varnishes, plasticizers, wetting agents, etc. [0003] At present, most of the production of 1,4-dioxane in the actual chemical production process still uses liquid acid such as concentrated sulfuric acid as a catalyst. Severe corrosion of equipment, serious environmental pollution from residual liquid and wastewater, harsh operating conditions, difficult post-processing of products, ma...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the production of 1,4-dioxane in the actual chemical production process still uses liquid acid such as concentrated sulfuric acid as a catalyst. Severe corrosion of equipment, serious environmental pollution from residual liquid and wastewater, harsh operating conditions, difficult post-processing of products, many by-products, poor selectivity, and difficulty in continuous production in technology, etc., cannot meet the current needs of environmental protection and economic development; Although a small number of enterprises have used solid acid catalysts such as alumina or molecular sieves in the prior art, they are prone to dissolution, poor stability, short life, easy deactivation, wide acid strength distribution, small pore size, and easy carbon deposition. Defects such as complex surface properties of the catalyst