Process of pulping and bleaching fibrous plant material with tert-butyl alcohol and tert-butyl peroxide
AssigneeABB Lummus Crest Inc.
InventorsAtef Shaban, George D. Suciu
Life of this patent
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Abstract
A process for producing bleached pulp from a fibrous plant material (e.g., wood), wherein the material is contacted with an alcohol solvent in a pulping zone to extract lignin from the fibrous plant material. The resulting pulp is then treated with a hydroperoxide or peroxide bleaching agent in a bleaching zone to form bleached pulp. Alcohol formed from the hydroperoxide or peroxide during the bleaching process may be recycled to the pulping zone. A preferred alcohol is tert-butyl alcohol, while a preferred hydroperoxide is tert-butyl hydroperoxide.
Claims12
A process for producing bleached pulp from a fibrous plant material, comprising:
- (a) reacting isobutane with oxygen in an oxidation zone to produce tert-butyl alcohol and tert-butyl hydroperoxide;
- (b) separating said tert-butyl alcohol from said tert-butyl hydroperoxide;
- (c) passing said tert-butyl alcohol and said tert-butyl hydroperoxide to an integrated pulping and bleaching system, said integrated pulping and bleaching system including a pulping zone and a zone, wherein said tert-butyl alcohol is passed to said pulping zone and said tert-butyl hydroperoxide is passed to said bleaching zone;
- (d) contacting said fibrous plant material with said tert-butyl alcohol in said pulping zone, wherein said fibrous plant material is delignified upon contacting of said fibrous plant with said tert-butyl alcohol, and pulp is formed from said fibrous plant material;
- (e) contacting said pulp with said tert-butyl hydroperoxidie in said bleaching zone to effect bleaching thereof;
- and
- (f) recovering from said bleaching zone bleached pulp and tert-butyl alcohol.
Dependencies are inferred from the claim text.