Removal of nitrogen containing compounds from tobacco
The present invention provides for a process for removing nitrogen containing compounds from tobacco with minimum removal of desired compounds. The process includes the steps of mixing a tobacco containing material with an aqueous solvent to form an extract; the extract is then separated from the tobacco containing material and contacted with an adsorbent material. The adsorbent material is selected from the group consisting of a bentonite and a charcoal material, β-cyclodextrin, cellulose acetate and combinations thereof. The extract is then added back to the tobacco containing material that may or may not have been processed.
1 . A process for selectively removing nitrogen containing compounds from tobacco, comprising the steps of:
mixing a first tobacco containing material with an aqueous solvent to form an extract and a first tobacco residue;
separating said first tobacco residue from said extract;
contacting said extract with an adsorbent material, wherein said adsorbent material is selected from the group consisting of a bentonite and activated carbon material, cellulose acetate, β-cyclodextrin and combinations thereof; and
introducing said extract to a second tobacco containing material.
2 . The process of claim 1 wherein said mixing of said first tobacco containing material with an aqueous solvent is at about 60° to about 90° C. for about 15 to about 30 minutes.
3 . The process of claim 1 wherein said mixing of said first tobacco containing material with an aqueous solvent is carried out with about one part of tobacco to about eleven to fifteen parts of water.
4 . The process of claim 1 wherein said separating of said first tobacco residue from said extract is accomplished by centrifuge or by filtration.
5 . The process of claim 1 wherein said contacting an extract with an adsorbent material is carried out by passing said extract through a packed column having said adsorbent.
6 . The process of claim 1 wherein said contacting an extract with an adsorbent material is accomplished by re-circulating said extract with said adsorbent.
7 . The process of claim 6 wherein said extract is separated from said adsorbent material by centrifuge or filtration.
8 . The process of claim 1 wherein said adsorbent material has bentonite and activated carbon.
9 . The process of claim 8 wherein said adsorbent has about one part of activated carbon for one part of bentonite.
10 . The process of claim 8 wherein said adsorbent has about two parts of activated carbon for one part of bentonite.
11 . The process of claim 8 wherein said adsorbent has about three parts of activated carbon for one part of bentonite.
12 . The process of claim 8 wherein said adsorbent has about four parts of activated carbon for one part of bentonite.
13 . The process of claim 8 wherein said adsorbent has about two parts of bentonite for one part of activated carbon.
14 . The process of claim 1 wherein said adsorbent material has cellulose acetate.
15 . The process of claim 1 wherein said adsorbent material has β-cyclodextrin.
16 . The process of claim 1 wherein said process includes a step of concentrating said extract forming a concentrated extract, wherein said concentrating step follows said step of separating said first tobacco containing material from said extract.
17 . The process of claim 1 wherein said second tobacco containing material is said first tobacco residue.
18 . An adsorbent for selective removal of nitrogen containing compounds from an aqueous tobacco extract, wherein said adsorbent is selected from the group consisting of a bentonite and activated carbon material, cellulose acetate, β-cyclodextrin and combinations thereof.
19 . The adsorbent of claim 18 wherein said bentonite and activated carbon material comprises bentonite and activated carbon in a ratio of about one part of bentonite to about one part of activated carbon.
20 . The adsorbent of claim 18 wherein said bentonite and activated carbon material comprises bentonite and activated carbon in a ratio of about one part of bentonite to about two parts of activated carbon.
21 . The adsorbent of claim 18 wherein said bentonite and activated carbon material comprises bentonite and activated carbon in a ratio of about one part of bentonite to about three parts of activated carbon.
22 . The adsorbent of claim 18 wherein said bentonite and activated carbon material comprises bentonite and activated carbon in a ratio of about one part of bentonite to about four parts of activated carbon.
23 . The adsorbent of claim 18 wherein said bentonite and activated carbon material comprises bentonite and activated carbon in a ratio of about two parts of bentonite to about one part of activated carbon.