Solid acid complex catalyst and its preparing process

Abstract

The invention is a solid acid compound catalyst whose component is: 10-80% sulfuric acid or phosphoric acid, 1-10% fluosulfonic acid resin and oxide of silicon, aluminum, titanium or zirconium; the fluosulfonic acid resin the polymer of perfluoroethylene and sulfonated perfluoroethylene, its average molecular weight is 300-500 thousands, the sulfonating rate is 1-5%. The mol rate of carbon element and fluorin element is 1:2. The catalyst blends the liquid acid and solid acid into a compound evenly, it maintains the nature of the liquid acid and the solid acid, and it has higher acid intensity and acid center quantity, the distribution of the acid center is even, the liquid acid will not be lost in the reaction.

Description

technical field [0001] The invention relates to a solid acid composite catalyst and a preparation method thereof. More specifically, it relates to a solid acid composite catalyst composed of liquid acid, solid acid and inorganic oxide and its preparation method. technical background [0002] Sulfuric acid, phosphoric acid, hydrofluoric acid and aluminum trichloride are widely used acid catalysts in industry. Some important processes such as alkylation, esterification, isomerization, etc. have used these catalysts or are still using them today. Although these catalysts have good catalytic activity, because they are all used under homogeneous conditions, compared with heterogeneous phases, they have problems such as difficult to achieve continuous production in technology, difficult separation of catalysts from raw materials and products, and easy equipment. Corrosion and other disadvantages; in addition, in some important chemical processes, a large number of by-products wi...

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Problems solved by technology

But these two methods also have some disadvantages: in the former method, the liquid acid is difficult to immobilize, and it is very easy to lose; in the latter method, the acid center is unevenly distributed, the active center is few, and a higher reaction temperature is required, so in some Reactions that require strong acid or low temperature, such as the alkylation of isobutane butene, are currently difficult to replace liquid acids

In fact, in this type of reaction, although the acid strength of solid superacids is much higher than that of sulfuric acid, solid superacids still cannot reach the reactivity of liquid acids such as 95% sulfuric acid.