Chlorine introducing method of 3,5-dichloro-4-aminotrifluorotoluene and chlorine introducing system applied to chlorine introducing method

Abstract

Disclosed are a chlorine introducing method for 3,5-dichloro-4-aminotrifluorotoluene and a chlorine introducing system applied to the chlorine introducing method. The chlorine introducing method for 3,5-dichloro-4-aminotrifluorotoluene comprises the following steps: checking each piece of equipment of the chlorine introducing system; feeding 4-amino-trifluorotoluene into a chlorination kettle; placing dichloroethane into the chlorination kettle; adding water; steaming; starting chlorination; introducing liquid chlorine into a hot water tank; sampling and analyzing; and after the chlorine introduction is finished, layering. The chlorine introducing system comprises two sets of chlorination equipment assemblies, and the chlorination equipment assemblies comprise the chlorination kettle 1, a chlorine buffer tank 2, a chlorine cylinder 3 and a gasifier 4. The present invention has the following beneficial effects: chlorine is introduced from the bottom, so the amount of the liquid chlorine used is greatly reduced, raw materials are saved, liquid alkali used for tail gas absorption is reduced, a considerable economic benefit is obtained, and at the same time the environmental pollution is reduced and a better environmental benefit is achieved.

Description

technical field [0001] The present invention relates to a 3,5-dichloro-4-aminotrifluorotoluene chlorine passage method, and also relates to a chlorine passage system applied in the 3,5-dichloro-4-aminotrifluorotoluene chlorine passage method. Background technique [0002] For a long time, the reaction of liquid chlorine chlorination is that the liquid chlorine is heated and vaporized and then passed into the material from the upper part of the reactor. Due to the internal stirring of the reactor or other reasons, the depth of the chlorine pipe inserted into the tank is limited, so there is always a problem. Too much chlorine gas has no time to react and volatilizes and enters the tail gas absorption system together with hydrogen chloride gas. Due to the presence of more chlorine gas, not only the raw material liquid chlorine is wasted, the burden of the tail gas absorption system is increased, but also the alkali used for tail gas absorption is greatly increased. liquid, inc...

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Problems solved by technology

[0002] For a long time, the reaction of liquid chlorine chlorination is that the liquid chlorine is heated and vaporized and then passed into the material from the upper part of the reactor. Due to the internal stirring of the reactor or other reasons, the depth of the chlorine pipe inserted into the tank is limited, so there is always a problem. Too much chlorine gas has no time to react and volatilizes and enters the tail gas absorption system together with hydrogen chloride gas. Due to the presence of more chlorine gas, it not only wastes the raw material liquid chlorine, increases the burden of the tail gas absorption system, but also greatly increases the alkali used for tail gas absorption. Liquid, increasing the product cost of the enterprise

It not only causes great pollution to the environment, but also wastes a large part of resources (liquid chlorine), which not only wastes money, but also pollutes the environment

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