Process for producing ethanol from textile cotton
First Claim
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1. A process for the production of ethanol from textile cotton, comprising the steps of:
- a) Pre-treating textile cotton, said pre-treating consisting of a mechanical process selected from the group consisting of;
(1) pulping a mixture of textile cotton and water in a twin-screw extruder at a temperature of between 60°
C. and 180°
C., wherein the water represents between 200% and 450% of the mass of the textile cotton,and(2) (i) grinding textile cotton,(ii) pulping a mixture of the ground textile cotton obtained from (i) with water in a twin-screw extruder at a temperature of between 60°
C. and 180°
C., wherein the water represents between 200% and 450% of the mass of the ground textile cotton;
b) Performing enzymatic hydrolysis of the pre-treated textile cotton and water mixture to form a medium comprising a sugary juice, enzymes used in said enzymatic hydrolysis, non-cellulose compounds, non-degraded cellulose, and dye from the textile cotton;
c) Performing filtration of the medium to separate the sugary juice from the enzymes, non-cellulose compounds, non-degraded cellulose and dye;
d) Fermenting the sugary juice with yeast, ande) Obtaining ethanol from step d).
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Abstract
A recycled textile cotton used for producing ethanol by the execution of a process that includes a step of pretreatment of textile cotton by pulping in an extruder, which may or may not involve a grinding step prior to pulping in the extruder, a step of enzymatic hydrolysis, a step of filtration(s), and a step of fermentation.
18 Citations
16 Claims
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1. A process for the production of ethanol from textile cotton, comprising the steps of:
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a) Pre-treating textile cotton, said pre-treating consisting of a mechanical process selected from the group consisting of; (1) pulping a mixture of textile cotton and water in a twin-screw extruder at a temperature of between 60°
C. and 180°
C., wherein the water represents between 200% and 450% of the mass of the textile cotton,and (2) (i) grinding textile cotton, (ii) pulping a mixture of the ground textile cotton obtained from (i) with water in a twin-screw extruder at a temperature of between 60°
C. and 180°
C., wherein the water represents between 200% and 450% of the mass of the ground textile cotton;b) Performing enzymatic hydrolysis of the pre-treated textile cotton and water mixture to form a medium comprising a sugary juice, enzymes used in said enzymatic hydrolysis, non-cellulose compounds, non-degraded cellulose, and dye from the textile cotton; c) Performing filtration of the medium to separate the sugary juice from the enzymes, non-cellulose compounds, non-degraded cellulose and dye; d) Fermenting the sugary juice with yeast, and e) Obtaining ethanol from step d). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A process for the production of ethanol from textile cotton, comprising the steps of:
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pretreating textile cotton, said pretreating consisting of a mechanical process of; (i) grinding textile cotton to form a ground textile cotton and (ii) pulping the ground textile cotton obtained in (i) with water that is between 200% and 450% of the mass of ground textile cotton in a twin-screw extruder at a temperature of between 60°
C. and 180°
C.;preparing a reaction medium for enzymatic hydrolysis in which the pre-treated textile cotton and the water are combined with enzymes for hydrolysis; filtering the medium after enzymatic hydrolysis to remove non-cellulose and non-degraded cellulose from the medium thereby obtaining a clarified medium; subjecting the clarified medium to ultrafiltration to recover a concentrate and a permeate, the concentrate being enzymes of the hydrolysis and the permeate being a sugary juice; subjecting the sugary juice to reverse osmosis to concentrate the sugary juice; subjecting the concentrated sugary juice to sterile filtration to obtain a sterile concentrated sugary juice; subjecting the sterile concentrated sugary juice to fermentation with yeast in a fermenter, recovering the yeast used in the fermenting by microfiltration; and distilling or dehydrating the fermented sugary juice to produce ethanol, wherein at least one of the recovered concentrate of enzymes or the recovered yeast is recycled in the enzymatic hydrolysis step or the fermentation step, respectively. - View Dependent Claims (13, 14, 15, 16)
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Specification