Acetal preparation method

Abstract

The present invention discloses an acetal preparation method, which comprises: 1, adding a copper-based salt to ethanol to make the ethanol be subjected to a dehydrogenation reaction so as to obtain acetaldehyde; 2, adding the prepared acetaldehyde to an enamel reaction pot while adding hydrogen chloride to make the acetaldehyde be subjected to a polymerization reaction so as to generate acetal, wherein the polymerization reaction is performed for 4 h at a temperature of 30-35 DEG C under the effect of external circulation cooling water; and 3, washing the reaction solution by using an alkali liquid so as to prepare the crude acetal. According to the present invention, with the method, the acetal production efficiency is improved; the requirements on the pressure resistance of the reaction container are reduced so as to reduce the enterprise production cost; the copper acetate is used as the precursor for producing the copper active ingredient and has the good selectivity of the catalytic activity, such that the yield of the obtained acetal is high; and the single food-grade ethanol is adopted as the raw material, such that the whole production process has the characteristics of environmental protection and no pollution, and the sustainable development of ecology is easily achieved.

Description

technical field [0001] The invention relates to a method for synthesizing organic compounds, in particular to a method for preparing acetal. Background technique [0002] Acetal, the chemical name is diethoxymethane, abbreviated as DEM. It is mainly used as a solvent, as well as for the synthesis of organic matter and the manufacture of cosmetics and fragrances. Used as a solvent, organic synthesis, rubber accelerator and antioxidant, often used in pesticides, incense, medicine, and paint industries. In the past ten years, in the fine chemical industry, it has been widely commercialized as an excellent solvent, and its preparation method, separation, purification and application research have attracted widespread attention from all over the world. [0003] Regarding the preparation method of acetal, many existing enterprises are accustomed to using recycled industrial alcohol to produce acetaldehyde through oxidative distillation in order to pursue profits, and then use ac...

AI Technical Summary

Problems solved by technology

There is also the use of dichloromethane to produce acetal, but this method requires sodium ethylate as a reagent and requires anhydrous operation

Therefore the yield is low

In addition, there is also a dimethyl sulfoxide method to produce acetal, but dimethyl sulfoxide is unstable to acids, and it is easy to decompose into formaldehyde when heated, and formaldehyde reacts with ethanol to obtain acetal

This method is also not conducive to large-scale production due to the large amount of dimethyl sulfoxide and the low yield.

There is also the use of calcium chloride method to produce acetal. The yield of this reaction is better, but the reaction time is long and the follow-up treatment is inconvenient

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