Method for preparing nicotine sulfate

A technology of nicotine sulfate and nicotine, which is applied in the field of tobacco chemistry, can solve the problems of no application reports for the preparation of nicotine sulfate, low concentration energy consumption, etc., and achieve the effect of poor interception efficiency and low energy consumption

Active Publication Date: 2020-05-19
CHINA TOBACCO YUNAN NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Forward osmosis concentration is a high-tech membrane concentration method driven by osmotic pressure, which can realize the concentration of substances in the form of aqueous solution at relatively low temperature and low pressure. It is especially suitable for high-fold concentr...

Method used

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  • Method for preparing nicotine sulfate
  • Method for preparing nicotine sulfate
  • Method for preparing nicotine sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing nicotine sulfate, wherein the tobacco raw material or its water extract is steam-distilled under alkaline conditions to obtain a low-concentration nicotine distillate; it also includes the following steps:

[0024] Step (1), the low-concentration nicotine distillate is concentrated by forward osmosis, and concentrated to a nicotine concentration of 5% in the retentate at 5°C-25°C;

[0025] Step (2), adding sulfuric acid with a mass percentage concentration of 5% to the retained liquid, reacting with nicotine in the retained liquid to obtain a nicotine sulfate solution, and then evaporating and concentrating to obtain sulfuric acid with a mass percentage concentration of 40% nicotine.

[0026] The mass percent content of nicotine in the low-concentration nicotine distillate is 0.05%.

[0027] In the forward osmosis concentration, the aquaporin membrane is used as the forward osmosis concentration membrane, the inorganic salt is used as the extract...

Embodiment 2

[0030] A method for preparing nicotine sulfate, wherein the tobacco raw material or its water extract is steam-distilled under alkaline conditions to obtain a low-concentration nicotine distillate; it also includes the following steps:

[0031] Step (1), the low-concentration nicotine distillate is concentrated by forward osmosis, and concentrated to a nicotine concentration of 20% in the retentate under the condition of 20°C-45°C;

[0032] Step (2), adding sulfuric acid with a mass percentage concentration of 40% to the retained liquid, reacting with nicotine in the retained liquid to obtain a nicotine sulfate solution, and then evaporating and concentrating to obtain sulfuric acid with a mass percentage concentration of 60% nicotine.

[0033] The mass percentage of nicotine in the low-concentration nicotine distillate is 1%.

[0034] The said forward osmosis concentration uses a polyamide membrane as a forward osmosis concentration membrane, uses an inorganic salt as a draw...

Embodiment 3

[0037] A method for preparing nicotine sulfate, wherein the tobacco raw material or its water extract is steam-distilled under alkaline conditions to obtain a low-concentration nicotine distillate; it also includes the following steps:

[0038] Step (1), the low-concentration nicotine distillate is concentrated by forward osmosis, and concentrated to a nicotine concentration of 15% in the retentate under the condition of 10°C-35°C;

[0039] Step (2), adding sulfuric acid with a mass percentage concentration of 20% to the retained liquid, reacting with nicotine in the retained liquid to obtain a nicotine sulfate solution, and then evaporating and concentrating to obtain sulfuric acid with a mass percentage concentration of 50% nicotine.

[0040] The mass percentage of nicotine in the low-concentration nicotine distillate is 0.5%.

[0041] The said forward osmosis concentration uses a polyamide membrane as a forward osmosis concentration membrane, uses an inorganic salt as a dr...

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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...

Claims

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Application Information

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IPC IPC(8): C07D401/04
CPCC07D401/04
Inventor 孔宁川王浩雅王乃定高则睿徐重军史小波韩智强孟秋晗徐世涛蒋卓芳黄彪
Owner CHINA TOBACCO YUNAN NEW MATERIAL
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