Patent ID: 11937626
Assignee: NICOVENTURES TRADING LIMITED
Field: Other consumer goods (Other fields)
Classification: CPC A | IPC A

Claim 26:
27. A method of preparing a whitened tobacco material, comprising:
(i) extracting a tobacco material with an extraction solution to provide a tobacco solids material and a tobacco extract;
(ii) cooking the tobacco solids material in an alkaline cooking liquid comprising sodium sulfide and having a pH of greater than 11 to form a tobacco pulp;
(iii) treating the tobacco pulp with a first acid to lower the pH of the tobacco pulp and provide a neutralized tobacco pulp;
(iv) extracting the neutralized tobacco pulp with a first aqueous solution comprising a first chelating agent to provide an extracted tobacco pulp;
(v) bleaching the extracted tobacco pulp with a first bleaching solution comprising a first oxidative agent to provide a bleached tobacco material;
(vi) treating the bleached tobacco material with a second acid to lower the pH of the bleached tobacco material and provide a neutralized tobacco material;
(vii) extracting the neutralized tobacco material with a second aqueous solution comprising a second chelating agent to provide an extracted tobacco material; and
(viii) bleaching the extracted tobacco material with a second bleaching solution comprising a second oxidative agent to provide a whitened tobacco material.