Method for recovering solvent acetone in production of N-(1-naphthyl) ethylenediamine dihydrochloride

Abstract

The invention relates to a method for recovering solvent acetone in the production of N-(1-naphthyl) ethylenediamine dihydrochloride, which comprises the following steps: (1) decoloring and removing impurities; (2) neutralizing; (3) drying and dehydrolyzing with a molecular sieve; and (4) distilling, and collecting the fraction at 56.5 DEG C to obtain the acetone conforming to the industrial standard. The recovering method can effectively recover the acetone in most of the acetone mother solution with the acetone recovery rate of above 65%, and the recovered acetone is of stable and reliable quality and can be reused. Thus, the production cost of the environment friendly reagent, namely the N-(1-naphthyl) ethylenediamine dihydrochloride, can be greatly reduced; what is more important, three wastes generated in the production are reduced with the reduction of total consumption of the acetone, thereby obviously reducing the pollution to the environment such as atmosphere, soil, water body and the like and making a great progress in the aspects of environment protection and economic benefit.

Description

technical field [0001] The invention belongs to the field of solvent recovery, in particular to a recovery method of solvent acetone in the production of environmental protection reagent naphthaleneethylenediamine hydrochloride. Background technique [0002] As an important chemical raw material, acetone is industrially used as a solvent in explosives, plastics, rubber, fiber, leather, oil, paint and other industries. An important raw material for substances such as chloroform and epoxy resin. [0003] Acetone has been widely used as an important solvent. At present, a large amount of acetone mother liquor is produced in the process of producing environmentally friendly reagent naphthaleneethylenediamine hydrochloride. Because the mother liquor contains a large amount of water and a small amount of hydrochloric acid, naphthalene and other Impurities can no longer be used, and most manufacturers choose to dump them, which will not only cause water and air pollution, and enda...

AI Technical Summary

Problems solved by technology

[0003] Acetone has been widely used as an important solvent. At present, a large amount of acetone mother liquor is produced in the process of producing environmentally friendly reagent naphthaleneethylenediamine hydrochloride. Because the mother liquor contains a large amount of water and a small amount of hydrochloric acid, naphthalene and other Impurities can no longer be used, and most manufacturers choose to dump them, which will not only cause water and air pollution, and endanger human health, but also cause serious fire hazards due to the high flammability of acetone, and also increase production. cost

Although a small number of manufacturers can use solvent recovery machines to recover acetone, but the upfront investment is large, the production cost is high, and the recovery rate is low