Device for preparing hypochloric acid for production of epoxide by chlorohydrin method and usage method thereof

Abstract

The invention discloses a device for preparing hypochloric acid for the production of epoxide by a chlorohydrin method and a usage method thereof. The device comprises a hypochloric acid reactor (1),a dehydrochlorination reactor (2), a gas-liquid separator (3), an ejector (4) and a carbon dioxide recovery reactor (5). The device is used for removing associated hydrogen chloride in a hypochloric-acid reaction by using calcium carbonate in the dehydrochlorination reactor (2), and can be used for preparing a hydrogen chloride-free hypochloric acid aqueous solution in a chlorohydrination reactionin the production of the epoxide by the chlorohydrin method; no chlorine is enabled to be in contact with a to-be-chlorohydrinated raw material in the subsequent chlorohydrination reaction; no hydrogen chloride is in contact with chlorohydrin; a few by-products are generated in the chlorohydrination reaction; many target products are generated; the concentration at an outlet of an alcoholizationreactor can be improved; the production capacity of the device is increased; the saponification wastewater quantity is reduced; the environment-friendly treatment and the resource utilization are enabled to be easy; the production of the epoxide is carried out by utilizing the hydrogen chloride-free hypochloric acid prepared by the device, and the economic benefit and the environmental benefit areobvious.

Description

technical field [0001] The invention relates to a preparation device and a use method of an intermediate product in the production process of chemical products, in particular to a preparation device and a use method of hydrogen chloride-free hypochlorous acid in the production of epoxides by the chlorohydrin method. Background technique [0002] There are various production methods of epoxides, among which the chlorohydrin method is the classic traditional production method most used in my country and the world. The production of epoxides by the chloric acid method has a long history and mature technology, but the production of epoxides by this method is backward and has many by-products. The hypochlorous acid solution entering the chloroalcoholation reactor contains hydrogen chloride, which reacts with the generated chlorohydrins in the chlorohydrination reaction, resulting in the generation of by-products; in addition, the traditional chlorohydrination reactor is also diff...

AI Technical Summary

Problems solved by technology

In order to generate as few by-products as possible, the traditional chlorohydrinization reactor can only be operated at a low chlorohydrin concentration, resulting in low unit production capacity of the traditional chlorohydrin method epoxide production unit; also due to the low concentration of chlorohydrin in the traditional chlorohydrinization reactor, There are many by-products, the composition of the product after the subsequent saponification reaction is complex, the amount of waste water is large, and it is difficult to meet the national environmental protection discharge standards; in addition, the traditional chlorohydrin method is produced because the hypochlorous acid solution contains hydrogen chloride, and the production equipment is severely corroded.

To sum up, many deficiencies in the production of epoxides by the traditional chlorohydrin method are related to the presence of hydrogen chloride in the hypochlorous acid solution.

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