A kind of preparation method and application of fly ash immobilized copper p-toluenesulfonate catalyst

Abstract

The invention provides a preparation method of a flyash-immobilized copper p-toluene sulfonate catalyst. The preparation method is characterized by comprising: activating flyash and immobilizing copper p-toluene sulfonate. The activating step of flyash includes: dissolving with a base, filtering to remove impurity, neutralizing, washing, and filtering to obtain filter cake. The immobilizing step of copper p-toluene sulfonate includes the steps, such as impregnating, spray-drying and activating, to obtain high-performance solid, the copper p-toluene sulfonate catalyst. The catalyst prepared bythe preparation method is equivalent to concentrated sulfuric acid catalysts in catalytic performance, while the catalyst has the advantages that, for instance, the reaction product is colorless, thecatalyst is simple to separate and well reusable, the production process is simple, and production investment is low.

Description

technical field [0001] The invention belongs to the field of fine chemical industry, and in particular relates to a preparation method of a fly ash immobilized copper p-toluenesulfonate catalyst and its application in the synthesis of tributyl citrate. Background technique [0002] Copper p-toluenesulfonate is a catalyst that can replace sulfuric acid, and it is widely used. In recent years, there are many research reports. It not only has high reactivity, good selectivity, and the product color is light or even colorless, and it is close to neutral. Equipment, pipeline valves, etc. are almost non-corrosive, which can greatly reduce the investment in equipment and so on; but because it is soluble in water, etc., there are problems such as difficult separation of catalyst and product. In order to facilitate the separation of the catalyst and the product after the reaction, facilitate the recovery and reuse of the catalyst, and reduce the amount of the active phase of the cata...

AI Technical Summary

Problems solved by technology

However, there is a large difference between coastal and inland areas. The utilization rate of fly ash in coastal areas such as Shanghai and Nanjing exceeds 100%, but the utilization rate of fly ash in inland areas such as Shanxi and Inner Mongolia is still less than 5%.

Due to the high price and narrow sources of ionic liquids, there is still a long way to go before large-scale industrialization; heteropolyacids, p-toluenesulfonic acid and their salts have the advantages of high activity and high selectivity, but they have their own As a liquid, it is difficult to separate the catalyst and product after the reaction