Production process of bis (chlorosulfonyl) imide

Abstract

The invention relates to the technical field of production of bis (chlorosulfonyl) imide, in particular to a production process of bis (chlorosulfonyl) imide. The production process of the bis (chlorosulfonyl) imide comprises the steps of adding sulfamic acid and thionyl chloride into a reaction kettle until solids are completely dissolved, then adding sulfur trioxide into the reaction kettle at a constant speed, after the sulfur trioxide is completely added, heating to the temperature of 90-120 DEG C, continuing to react for 5-10 hours, restoring to normal pressure, opening a condensate outlet valve of a condenser, continuing to react for 1-3 hours, carrying out reduced pressure rectification until no condensate flows out of the condenser, and obtaining the target product bis (chlorosulfonyl) imide. Compared with an original chlorosulfonic acid method process, the production process has the advantages that the hydrogen chloride waste gas amount is reduced by 1 / 3, the sulfur dioxide tail gas can be recycled and reused in a thionyl chloride production device, the yield of three wastes is further reduced, and the production process belongs to an innovative process meeting the development requirements of the green chemical industry.

Description

technical field [0001] The invention relates to the technical field of bischlorosulfonimide production, in particular to a production process of bischlorosulfonimide. Background technique [0002] As the market demand for bisfluorosulfonimide, a new type of electrolyte for lithium batteries, continues to increase in recent years, the production process of its raw material bischlorosulfonimide is becoming more and more important. Further production of bisfluorosulfonimide is currently the most valuable production method. [0003] The mainstream production process of dichlorosulfonimide includes two types: one is to synthesize dichlorosulfonimide with sulfamic acid, thionyl chloride and chlorosulfonic acid as raw materials, and the reaction process is as follows: [0004] [0005] For example, patent CN101747242B discloses a preparation method of bisfluorosulfonimide, including the synthesis process of bischlorosulfonimide, which uses sulfamic acid, thionyl chloride, and c...

AI Technical Summary

Problems solved by technology

It uses chlorosulfonic acid and chlorosulfonyl isocyanate as raw materials. Under the action of a catalyst, it reacts at a high temperature of 120-140°C and distills to obtain dichlorosulfonimide. The reaction equation is as follows. The advantage of this process is that there is no side effect of sulfur dioxide and hydrogen chloride. Gas production, high atomic utilization rate, but its problem is also prominent, chlorosulfonyl isocyanate raw material is prepared from cyanogen chloride and sulfur trioxide, cyanogen chloride is not only extremely toxic, but also very expensive, resulting in the production of chlorosulfonyl isocyanate raw material The cost of use is too high, which reduces the market profit margin of dichlorosulfonimide, so this process is difficult to use on a large scale

[0009] In summary, the current production process of bischlorosulfonimide has problems such as large amount of three wastes, many side reactions, and high cost of raw materials, and with the development of lithium battery industry and bisfluorosulfonimide electrolyte, the The product quality of sulfonimide also puts forward higher requirements, and it is urgent to develop a new and more advantageous production process to solve the above problems

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