Method for extracting high-purity nicotine from tobacco waste

Abstract

The invention discloses a method for extracting high-purity nicotine from tobacco waste. The method comprises the following steps of: after grinding the tobacco waste, uniformly mixing the ground tobacco waste with lime and water, conveying the obtained product into a fermentation tank by a caterpillar band to ferment for 1 hour so as to obtain a fermented material, and then conveying the fermented material into a horizontal rotary extractor; simultaneously, spraying a solvent onto the fermented material by a pump, enabling the solvent to seep out of an isolation net at the lower end of the fermented material after permeating the fermented material layer, carrying out two-stage filtration including coarse filtration and fine filtration on extracting solution, and recovering the solvent toobtain a crude product nicotine; and conveying the crude product nicotine into a supergravity revolving bed to carry out separation. By using the method disclosed by the invention, the finally obtained product has a purity of over 99%; and the method has the advantages of large processing volume, low consumption for water, electricity, the solvent and labor hours, low one-time investment and the like.

Description

technical field [0001] The invention relates to a large-scale extraction method of high-purity nicotine, in particular to a method for extracting high-purity nicotine from tobacco waste. Background technique [0002] my country is a big tobacco planting and producing country, with the tobacco planting area and output ranking first in the world. However, in the process of tobacco planting and production, about one million tons of waste tobacco leaves, soot, tobacco dust, tobacco stems and other tobacco solid waste are produced in the country every year. The traditional treatment methods of tobacco waste in my country are mainly incineration and landfill. The harmful substances produced during this period not only endanger human health, but also cause great pollution to atmospheric soil and groundwater. [0003] Nicotine, commonly known as nicotine, is an alkaloid present in Solanaceae (Solanum) and an important component of tobacco. It can be dissolved in water, ethanol, chl...

AI Technical Summary

Problems solved by technology

The third is that the production capacity is limited, and continuous feeding and continuous discharging cannot be achieved. After calculating the 1000-liter ultra-supercritical extraction device, it can process up to 3 tons of raw materials without stopping for 8 hours.

[0010] Although the molecular distillation method can achieve continuous production, the requirements for the materials entering the molecular distillation equipment are relatively strict, because the molecular distillation method is generally operated under a relatively high vacuum, and the separation temperature of nicotine should be around 100 ° C. If The material entering the molecular distillation equipment contains too much solvent, which will seriously affect the vacuum degree of the system. Therefore, it is generally necessary to remove the solvent from the material. If the material is extracted by a polar solvent, then in high temperature and high vacuum Side reactions such as carbonization and polymerization are very easy to occur under the environment, which will damage the molecular distillation equipment, and only use molecular distillation equipment to refine nicotine. It is almost impossible to obtain nicotine with a purity greater than 99% in one step. It must be matched with other processes, which increases equipment investment. , the increased processing steps lead to a decrease in the overall yield, resulting in an increase in cost

[0011] The rectification of the rectification tower is a batch operation, which cannot realize continuous feeding and discharging

[0012] Through the above analysis, it can be seen that there are various problems in the current industrialized high-purity nicotine production process, which reduces the production capacity of high-purity nicotine

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