Production system of 1,1,2-trichloroethane

Abstract

The invention relates to a production system of 1,1,2-trichloroethane. The production system includes a chlorination addition system and an alkali washing stratification system. The chlorination addition system includes a vinyl chloride gasification system, a chlorine gasification system and a chlorination system. The alkali washing stratification system includes an alkali preparation tank, an alkali washing kettle A, an alkali washing kettle B, an alkali washing kettle C, an alkali washing kettle D, an alkali washing kettle E, an alkali washing kettle F, an alkali washing trichloroethane intermediate tank, an alkali metering tank A, an alkali metering tank B, an alkali lye vacuum kettle A, an alkali lye vacuum kettle B and a vacuum gas storage tank. The advantages of the production systemof the 1,1,2-trichloroethane are that in the chlorination system, only a combination of a chlorination tower and a chlorination condenser is needed to complete reactions, the devices are simple in structure, are all conventionally used equipment, are occupy less space, thereby reducing production cost, and 1,1,2-trichloroethane liquid produced by the chlorination addition system is sent to the alkali washing stratification system for producing the 1,1,2-trichloroethane for alkali washing stratification, which can effectively remove impurities in the liquid, thereby ensuring the purity of theproduct.

Description

Technical field [0001] The invention belongs to the technical field of chemical production equipment, and particularly relates to a production system of 1,1,2-trichloroethane. Background technique [0002] 1,1,2-Trichloroethane is an important chemical raw material that can be used to prepare vinylidene chloride and other chemical products. 1,1,2-Trichloroethane is generally a chlorinated product made from vinyl chloride and chlorine gas. The reaction equation is: [0003] . [0004] Many documents and patents disclose the preparation of 1,1,2-trichloroethane. For example, the patent CN 100335450C discloses a preparation of 1,1,2-trichloroethane, which includes the following steps: Ethyl chloride is a circulating medium and is sent to the first mixed injection device. The vinyl chloride is drawn into the mixing zone of the first mixed injection device through the vinyl chloride inlet of the first mixed injection device, and then dissolved in 1,1,2-three Ethylene chloride and vin...

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Problems solved by technology

[0004] Many documents and patents disclose the preparation of 1,1,2-trichloroethane, such as patent CN 100335450C discloses a preparation of 1,1,2-trichloroethane, including the following steps: 1,1,2-trichloroethane Ethyl chloride is the circulating medium, which is fed into the first mixing injection device, and vinyl chloride is sucked into the mixing zone of the first mixing injection device through the vinyl chloride inlet of the first mixing injection device, and then dissolved in 1,1,2-tri The vinyl chloride of ethyl chloride is sent into the second mixing injection device, and the chlorine gas is sucked into the mixing zone of the second mixing injection device through the chlorine inlet of the second mixing injection device, and in the mixing zone of the second mixing injection device, vinyl chloride and The chlorine gas is mixed for pre-reaction, and then enters the main pipeline reactor equipped with static mixing components to continue the reaction to generate 1,1,2-trichloroethane. The reacted product is separated by a gas-liquid separator and enters the subsequent section. The invention The structure of the equipment is simple, the operation is convenient, the conversion rate of vinyl chloride can reach more than 98%, and the selectivity can reach more than 96%, which is convenient for industrial promotion and use; devices and main pipeline reactors equipped with static mixing components, these devices are relatively complex in structure and take up a lot of space, which will increase production costs; Certain impurities will affect the purity of the final product; 3. The follow-up section is to send 1,1,2-trichloroethane to the rectification tower for direct rectification. The by-products produced during the rectification process cannot be recycled. , greatly wasting resources and further increasing production costs

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