Environment-friendly and simple preparation method for synthesizing isophorone from acetone

Abstract

The invention relates to an environment-friendly and simple preparation method for synthesizing isophorone from acetone. The method is based on a liquid condensation method and comprises the steps of pouring acetone and a strong alkaline catalyst sodium hydroxide aqueous solution or a strong alkaline catalyst potassium hydroxide aqueous solution in an autoclave; adding microscale auxiliary catalysts of magnesium oxide, aluminum oxide, calcium oxide, barium oxide and a rare metal element of lanthanum; changing a reaction condition to lower reaction activation energy; heating to a temperature of 150 DEG C; reacting for 2 hours at a constant temperature with continuously stirring; cooling to a temperature of 80 DEG C; distilling and refluxing the unreacted acetone for use in the next time; standing residues in the autoclave; separating the liquid and draining out the aqueous solution for use in the next time; distilling the remained materials; and distilling the isophorone out to obtain a finished product. With the method, the formation of high-boiling residues and other by-products is reduced; conversion rate of acetone is increased; and selectivity for isophorone is increased. The environment-friendly and simple preparation method is short in reaction time, low in reaction temperature and simple and environment-friendly in process, and can meet modern requirements and realized production automation and production industrialization.

Description

technical field [0001] The invention relates to the field of industrial production, in particular to an environmentally friendly and simple preparation method for synthesizing isophorone from acetone. Background technique [0002] Isophorone, also known as 3,5,5-trimethyl-2-cyclohexen-1-one, is an important high-boiling solvent with strong dissolving ability and wide application. It is a good choice for polymer materials. solvent. At present, the production and consumption of isophorone are mainly in developed countries such as Britain, France, Germany, and the United States. There is no industrialized production of isophorone in my country, and only a few solvent companies are doing small-scale pilot research. [0003] There are two mature processes for synthesizing isophorone: the mesityl oxide method and the acetone condensation method. Among them, the mesityl oxide method is difficult for industrial production due to the high price of raw materials and high product cost...

AI Technical Summary

Problems solved by technology

[0007] It can be seen from the above literature that the liquid phase condensation method has the advantages of simple catalyst, easy operation, and high yield of isophorone, and is especially suitable for industrial production. However, the disadvantage is that the conversion rate of acetone is not high (20-40%), and repeated production consumes energy. Large, the reaction time is relatively long, the production cost is increased, and a large amount of waste liquid is generated, which is not conducive to environmental protection

[0008] In the heterogeneous catalytic condensation method of solid catalysts, magnesium and aluminum mixed oxides, magnesium-aluminum composite oxides or magnesium-aluminum hydrotalcites are commonly used as solid catalysts, which are made in a fixed bed reactor. The acetone conversion rate of this method is as high as 50%, but the developed catalyst has shortcomings such as short life, difficult regeneration, complicated preparation process, high cost, etc., and the temperature required for the conditions is relatively high (200~400°C), energy consumption is large, and the selectivity of isophorone is low

Thereby also restricting the development of isophorone industrialization

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