Method for preparing nicotine sulfate

Abstract

The invention relates to a method for preparing nicotine sulfate, and belongs to the technical field of tobacco chemistry. According to the method, an aquaporin membrane and a polyamide membrane are used as forward osmosis concentration membranes, an inorganic salt is used as an absorbing agent, and a low-concentration nicotine distillate is subjected to forward osmosis concentration until the trapped fluid nicotine concentration is 5%-20%; 5%-40% sulfuric acid which is slightly excessive in chemical calculation is added into a trapped fluid to obtain a nicotine sulfate solution with relatively high concentration, and then evaporating and concentrating are carried out to obtain a 40%-60% nicotine sulfate product. According to the method, the concentration of the reactant nicotine during nicotine sulfate generation is greatly improved by adopting forward osmosis concentration, so that the concentration of the reaction product nicotine sulfate is improved, the evaporation capacity of water during preparation of a final product by subsequent evaporation and concentration is reduced, and the evaporation energy consumption is greatly reduced; by utilizing the characteristic of poor interception efficiency of forward osmosis concentration on ammonia, the ammonia content in the trapped liquid is greatly reduced, so that the ammonium salt content in a final product is greatly reduced,and the purity of nicotine sulfate is greatly improved.

Description

technical field

[0001] The invention belongs to the technical field of tobacco chemistry, and in particular relates to a method for preparing nicotine sulfate. Background technique

[0002] Nicotine sulfate is an important product form of green nicotine pesticide. Its nicotine content is generally 40% and 60%. It is used as a residue-free and pollution-free high-efficiency insecticide for edible crops such as grain, oil, vegetables, and fruits. .

[0003] Tobacco raw material or its water extraction solution is steam distilled under alkaline conditions to obtain a low-concentration nicotine distillate (nicotine content between 0.05% and 1%), which is absorbed by 5%-20% sulfuric acid to form low-concentration nicotine sulfate The method of preparing not less than 40% nicotine sulfate by evaporation and concentration of alkali is called distillation method. But this method is because the nicotine concentration that uses when forming nicotine sulfate is low, causes the nicoti...

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