Novel chlorobenzene production process

Abstract

The invention provides a novel chlorobenzene production process. Chlorobenzene used in the novel chlorobenzene production process comprises the following raw materials: anhydrous benzene, chlorine, acatalyst and a positioning agent. The novel production process comprises the following steps: preparing the anhydrous benzene; enabling the anhydrous benzene to flow out from the bottom of a benzene high-level tank, metering by using a flowmeter, and continuously putting into a chlorinator from the bottom of the chlorinator; buffering qualified chlorine made after gasification of liquid chlorine by using a chlorine buffer tank, introducing into the chlorinator from the bottom of the chlorinator to flow upwards together with the anhydrous benzene along flows in a same direction, carrying out areaction under the action of the catalyst and the positioning agent in the chlorinator so as to generate a chlorination liquid, and carrying out aftertreatment on the chlorination liquid, thereby obtaining chlorobenzene. By adopting the novel production process provided by the invention, the problem that a great deal of wastewater is generated from water washing and alkali washing in the conventional method can be avoided, no wastewater is generated, in addition, the catalyst is long in service life, the equipment is long in service life, the detection cycle can be prolonged, a product made byusing the process is high in purity, and due to adoption of an iron catalyst and chelate EDTA-Fe with iron as the center as the positioning agent, the process is low in wastewater generation rate andgreen, environmentally friendly and fee of pollution.

Description

technical field [0001] The invention relates to the technical field of pesticide synthesis, in particular to a novel production process of chlorinated benzene. Background technique [0002] Chlorobenzene, also called chlorobenzene, is a colorless, transparent, volatile liquid with a bitter almond smell. Melting point -45.6°C, boiling point 131.6°C, relative density 1.107 (20 / 4°C), refractive index 1.5248, flash point 23°C, autoignition point 637.78°C, flammable. The explosion limit in air is 1.83-9.23% (volume). Insoluble in water, easily soluble in alcohol, ether, benzene and chloroform, etc. Toxic, moderately toxic. [0003] Chlorinated benzene is an important basic organic synthesis raw material, used as dyes, medicines, pesticides, and organic synthesis intermediates. It is used in the manufacture of phenol, nitrochlorobenzene, dinitrochlorobenzene, aniline, nitrophenol and the pesticide DDT, etc. It is also used as a solvent for ethyl cellulose and many resins. In ...

AI Technical Summary

Problems solved by technology

Among them, water washing and alkali washing will produce a large amount of waste water, which will affect product quality, cause corrosion to equipment and pipelines, and be difficult to handle, which not only increases production costs, but also may cause pollution to the environment and increase the cost of environmental governance