Byproduct comprehensive utilization method in diethyl hydroxylamine production

Abstract

The invention relates to a byproduct comprehensive utilization method in diethyl hydroxylamine production. The method comprises the following steps: pyrolysis and rectification purification are carried out on the raw material triethylamine under the action of a catalyst to obtain diethyl hydroxylamine, the diethyl hydroxylamine reduced pressure pyrolysis section generates a vacuum exhaust ethylene, and the vacuum exhaust ethylene sequentially passes through a reaction kettle I, a reaction kettle II and a reaction kettle III, wherein the reaction kettle I and reaction kettle II are filled with bromine water, the bromination reaction temperatures in the reaction kettle I and reaction kettle II are 10-80 DEG C, the reaction kettle III is filled with water, and the holding temperature of the reaction kettle III is 5-50 DEG C; and after the vacuum exhaust ethylene is subjected to absorption reaction in the reaction kettle I and reaction kettle II, the ethylene inside is converted into 1,2-dibromoethane, and the unreacted vacuum exhaust ethylene is subjected to water sealing through the reaction kettle III and sent to a torch to be combusted. The method provided by the invention has the advantages of simple production technique, mild reaction and low energy consumption, can effectively lower the production cost, enhances the economic benefits and reduces the environmental pollution.

Description

technical field [0001] The present invention relates to a method for comprehensive utilization of by-products of chemical products, in particular to a method for comprehensive utilization of by-products in the production of diethylhydroxylamine. Background technique [0002] Diethylhydroxylamine is mainly used in the production, storage and polymerization of conjugated olefins such as styrene, divinylbenzene, butadiene, isoprene, methyl methacrylate and acrylonitrile As a polymerization inhibitor, it can also be used in the production of non-standard monomers and other monomers containing active bonds. As a polymerization inhibitor, diethylhydroxylamine has a high polymerization inhibition effect, and the polymerization inhibition efficiency is not affected by temperature changes. The polymerization inhibition efficiency of hydroxylamine is twice that of tert-butanediol. It not only has high polymerization inhibition efficiency in the liquid phase, but also has good polymer...

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Problems solved by technology

[0005] This process will produce by-product ethylene. For every ton of triethylamine converted, about 0.28 tons of by-product ethylene will be produced along with the formation of diethylhydroxylamine. At present, the main treatment methods for this by-product ethylene are as follows: ( 1) Due to the small output of diethylhydroxylamine produced by domestic manufacturers, the by-product ethylene is not recycled and is generally discharged directly, causing greater environmental pollution; (2) In recent years, due to the increasingly stringent national environmental protection, the existing diethylhydroxylamine Hydroxylamine manufacturers began to use the method of ethylene gas discharge torch combustion for treatment

Although this method can reduce the environmental pollution caused by direct discharge, on the one hand, this method needs to increase additional high energy consumption, and on the other hand, it wastes a large amount of ethylene, which increases the cost of diethylhydroxylamine and reduces the competitiveness of diethylhydroxylamine; (3) Industrially, ethylene can be recovered by deep condensation, which is complex in process, high in energy consumption and uneconomical

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