Method for selective denitration of tobacco
AssigneePhilip Morris Incorporated
InventorGus D. Keritsis
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Abstract
A process for treating tobacco to reduce the delivery of various gas phase components, during combustion of tobacco products is disclosed. The process comprises contacting tobacco material with an aqueous solution to form a tobacco extract. After separating the extract from the fibrous tobacco portion, the extract is treated by an ionic extraction means such that nitrate ions are extracted while the potassium ion content of the extract is left substantially intact. The treated extract may then be recombined with the fibrous tobacco products. Such products exhibit reduced delivery of nitrogen oxides, HCN and CO during combustion.
Claims17
A method of treating tobacco to reduce its delivery of gas phase components during combustion which comprises:
- (a) contacting a tobacco material with an aqueous solution to obtain an aqueous potassium nitrate containing extract and an insoluble tobacco residue;
- (b) separating the aqueous extract from the insoluble tobacco residue;
- (c) selectively removing the nitrate ions from the tobacco extract without substantially reducing the potassium ion level employing an ionic extraction technique;
- and
- (d) combining the denitrated aqueous extract with insoluble tobacco residue which has been treated in accordance with steps (a) and (b).
A method of treating tobacco to reduce its delivery of oxides of nitrogen during combustion which comprises:
- (a) contacting a tobacco material with an aqueous solution to obtain an aqueous potassium nitrate containing extract and an insoluble tobacco residue;
- (b) separating the aqueous extract from the insoluble tobacco residue;
- (c) selectively removing the nitrate ions from the tobacco extract without substantially reducing the potassium ion level employing an ionic extraction technique;
- and
- (d) combining the denitrated aqueous extract with insoluble tobacco residue which has been treated in accordance with steps (a) and (b).
A method of making a smoking tobacco product which exhibits reduced delivery of gas phase components during combustion which comprises subjecting tobacco to the following treatments:
- (a) contacting a tobacco material with an aqueous solution to obtain an aqueous potassium nitrate containing extract and an insoluble tobacco residue;
- (b) separating the aqueous extract from the insoluble tobacco residue;
- (c) selectively extracting the nitrate ions from the tobacco extract without substantially reducing the potassium ion level by means of an ion extraction technique;
- (d) recombining the denitrated aqueous extract with the insoluble tobacco residue;
- and thereafter incorporating the tobacco into a smoking product.
A method for selectively denitrating tobacco which comprises:
- (a) contacting a tobacco material with an aqueous solution to obtain an an aqueous potassium nitrate containing extract and an insoluble tobacco residue;
- (b) separating the aqueous extract from the insoluble tobacco residue;
- (c) selectively removing the nitrate ions from the tobacco extract without substantially reducing the potassium ion level employing an ionic extraction technique;
- and
- (d) combining the denitrated aqueous extract with insoluble tobacco residue which has been treated in accordance with steps (a) and (b).
Dependencies are inferred from the claim text.