A method for reducing tsna and nitrate content in reconstituted tobacco leaf concentrate by electrodialysis

Abstract

The invention discloses a method for reducing the TSNA (tobacco-specific nitrosamines) content and the nitrate content of a reconstituted tobacco concentrated solution according to an electrodialysis method. The method comprises three times of electrodialysis treatment procedures: for the first time, electrodialysis desalination treatment is carried out to remove nitrate radical in the reconstituted tobacco concentrated solution, wherein the acid consumption used for adjusting a feed liquid to be acidic is reduced at the same time; for the second time, electrodialysis desalination treatment is carried out under a strong acid condition to remove TSNA in the papermaking reconstituted tobacco concentrated solution; for the third time, electrodialysis desalination treatment is carried out to recycle nicotine, wherein by-products generated in the step can be used for preparing fertilizer. The method has the advantages that the characteristics of reconstituted tobacco concentrated solution and electrodialysis are utilized comprehensively; TSNA and the precursor-nitrate of TSNA are effectively removed, while great loss of nicotine caused by the conventional electrodialysis treatment is avoided; the by-products are utilized effectively; the effects in the aspects of efficiency improvement, energy conservation, pollution reduction and the like are obvious; the method is suitable for industrialized mass production.

Description

1. Technical Field [0001] The invention relates to a separation method, in particular to a method for reducing the content of TSNA and nitrate in a reconstituted tobacco leaf concentrate by using an electrodialysis method. 2. Background technology [0002] Tobacco-specific nitrosamines (TSNA), such as NNK, NNN, NAT and NAB, are one of the main harmful components of cigarette smoke, and have an important impact on the hazard index of cigarette products. The tobacco-specific nitrosamines in the smoke mainly come from the heat transfer of the tobacco-specific nitrosamines contained in the tobacco itself and the thermal synthesis of the precursors of the tobacco-specific nitrosamines (such as nitrate, nitrite, etc.). Reducing the tobacco-specific nitrosamine content of tobacco itself and the tobacco-specific nitrosamine precursor are the main methods to reduce the release of tobacco-specific nitrosamines in cigarette smoke. [0003] Papermaking reconstituted tobacco is a reconstituted...

AI Technical Summary

Problems solved by technology

At present, the regulation of reconstituted tobacco leaf components is mainly carried out through the selection of raw materials, biochemical treatment, and the addition of functional components from external sources. Defects such as weak operability or high processing costs limit the application in the production of reconstituted tobacco leaves by papermaking methods

At present, membrane treatment technology is also used to regulate nitrate and nitrite in reconstituted tobacco leaves. For example, CN102524934A and CN101606748A all propose to use pressure-driven membranes, such as microfiltration membranes, ultrafiltration membranes and nanofiltration membranes, to remove biological macromolecules and nitrates. and chloride ions to improve the quality of reconstituted tobacco leaves by the papermaking method, but the removal of ionic compounds by pressure-driven membranes still has defects such as low electrolyte removal efficiency, weak selectivity, and high industrialization costs, and its industrialization process is slow.

Electrodialysis is an electrically driven membrane technology that uses the principle of ion exchange to desalinate. It has high desalination efficiency and shows good results in removing nitrate and nitrite. For example, CN103082394A, CN103330277A, US4302308A, and US4253929 use electrodialysis to remove tobacco extract Or the nitrate, nitrite and chloride ions in the extract of reconstituted tobacco leaves have shown certain effects in reducing the release of tobacco-specific nitrosamines in smoke. However, the methods provided by these patents are only for tobacco-specific nitrosamines. The precursor nitrate has a reducing effect, which can reduce the tobacco-specific nitrosamines in the thermally synthesized part of the flue gas, but has no effect on reducing the tobacco-specific nitrosamines in the tobacco extract, and the heat-transferred tobacco-specific nitrosamines are hardly affected. influences

In addition, the tobacco extract is weakly acidic, and the nicotine in the tobacco is also lost in a large amount during the electrodialysis process, up to 85%, which will inevitably lead to a reduction in the smoking power of the reconstituted tobacco leaves by the papermaking method

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