Clean production method of 2, 4-dinitrochlorobenzene

Abstract

The invention provides a clean production method of 2, 4-dinitrochlorobenzene, which comprises the following steps: by taking o-nitrochlorobenzene with the mass fraction of 99% as a raw material and a mixed acid solution prepared from sulfuric acid and nitric acid with the mass fraction of 98% as a nitrating agent, carrying out a continuous nitration reaction in a tubular reactor, pumping the nitrated mixed solution into a heat preservation kettle, after keeping the temperature for 2 hours, pumping the nitration mixed solution into a liquid separation kettle, and separating an upper-layer oil phase, namely a mixed solution of 2, 4-dinitrochlorobenzene and 2, 6-dinitrochlorobenzene, and a lower-layer water phase, namely a waste acid solution; adding fuming sulfuric acid into the separated waste acid solution, so that the moisture content in the waste acid solution is 2% or below; neutralizing the separated mixed solution of 2, 4-dinitrochlorobenzene and 2, 6-dinitrochlorobenzene, washing with water and performing crystallization separation, and obtaining the main product 2, 4-dinitrochlorobenzene and the by-product 2, 6-dinitrochlorobenzene. The continuous production process is adopted, the cost is reduced, prepared waste acid is mechanically applied, waste acid emission is reduced, and the environmental burden is relieved.

Description

Technical field [0001] The present invention belongs to the technical field of chemical production, in particular 2,4-dinitro method relates to a cleaning chlorinated benzene production. Background technique [0002] 2,4-nitrochlorobenzene is an important intermediate for fine chemicals, widely used in medicine, pesticides, fuel, explosive, chemical additives and other fields, 2,4-dinitro benzene chloride production process more, according to the different materials prepared by different methods, according to the "Encyclopedia of chemical products in China," second edition, volume, May 1998 second Edition, commonly prepared by two processes mentioned on page 840 are used in concentrated mixing sulfuric acid and nitric acid mixed together, but with the formation reaction associated with waste acid, causing serious harm to the environment and the burden on enterprises and industrial production. Inventive content [0003] Object of the present invention is to provide a continuous p...

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Problems solved by technology

[0002] 2,4-Dinitrochlorobenzene is an important fine chemical intermediate, which is widely used in the fields of medicine, pesticides, fuels, explosives, chemical additives, etc. The production process of 2,4-Dinitrochlorobenzene There are many, and the preparation methods are also different according to different raw materials. According to the second edition of "China Chemical Products Encyclopedia", volume one, the second edition in May 1998, the two commonly used preparation processes mentioned on page 840 are used in concentrated It is a mixed acid formed by mixing sulfuric acid and concentrated nitric acid, but in industrial production, the reaction is accompanied by the generation of waste acid, which causes serious harm and burden to the environment and enterprises

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