A method for separating and removing tsna in burley tobacco extract by electrodialysis

Abstract

The invention discloses a method for separating and removing TSNA (tobacco specific nitrosamine) in a burley tobacco extract by using an electrodialysis method. The method comprises two electrodialysis desalination treatment processes, wherein the first electrodialysis desalination treatment is: carrying out electrodialysis desalination treatment on a burley tobacco extract under the condition of invariable current density until the voltage is stabilized at 60V, and then carrying out electrodialysis desalination treatment at stable voltage of 60V until the conductivity is 1ms / cm; the second electrodialysis desalination treatment is: adjusting the pH value of a mixed solution which is obtained after the first electrodialysis desalination treatment to be 1.5-2.0, carrying out desalination treatment by adopting the condition same as that of the first electrodialysis desalination treatment until the conductivity is 0.3ms / cm, evaporating and concentrating, thereby obtaining burley tobacco essential oil with low TSNA content. By scientific comprehensive utilization of an electrodialysis technique, TSNA is effectively removed, use of a lot of organic acids is also avoided, and the method has significant effects in synergism, energy conservation, pollution reduction and the like, and is suitable for industrial mass production.

Description

1. Technical field [0001] The invention relates to a separation method, in particular to a method for separating and removing TSNA in Burley tobacco extract by electrodialysis. 2. Background technology [0002] Burley tobacco has a rich and characteristic aroma of Burley tobacco, which has a significant effect on increasing the tobacco aroma, smoke concentration and strength of cigarettes. It is not only an important raw material for mixed cigarettes, but also can modify the style characteristics of flue-cured cigarettes and improve the quality of cigarettes. The sensory quality of flue-cured tobacco has become one of the important raw materials for tar flue-cured cigarettes. Yet Burley tobacco leaf itself also has some inherent quality defects, especially wherein strong carcinogen-tobacco-specific nitrosamine (TSNA) content is high, about 10-100 times of flue-cured tobacco leaf, this causes Burley tobacco leaf and The harmfulness of its extract restricts the widespread use...

AI Technical Summary

Problems solved by technology

Some new separation techniques are also used to separate or enrich TSNA from tobacco, such as WO05 / 112670 and CN101547617A disclose a method for selectively separating TSNA from tobacco extracts using molecularly imprinted materials, the selectivity of molecularly imprinted materials for TSNA It can be used to treat tobacco products and their extracts, thereby reducing the TSNA content in them. However, this type of technology is currently mainly used in the detection of TSNA, and the preparation technology and use cost of this type of molecularly imprinted materials are relatively high. In addition, this type of material The adsorption capacity is limited, and the treatment effect on Burley tobacco extract with high TSNA is limited, and its industrial application is limited

As a high-efficiency desalination technology, electrodialysis has been widely used industrially in seawater desalination and wastewater treatment, and has also shown good results in the selective removal of ionic compounds in tobacco extracts, such as CN103371429A, CN103815536A, CN103330277A, CN103330278A , CN103082394A, US4302308A, and US4253929 utilize electrodialysis to remove chloride ions, ammonium ions, nitrate ions, and nitrite ions in tobacco extract or reconstituted tobacco leaf extract, but this electrodialysis can only remove ionic compounds , has no ability to remove non-ionic harmful substances (such as TSNA), so these electrodialysis treatment methods are not suitable for the removal of TSNA from Burley tobacco extract

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