USE OF RECYCLED COTTON FOR PRODUCING ETHANOL, AND PRODUCTION METHOD

• US 20110236945A1
• Filed: 12/04/2009
• Published: 09/29/2011
• Est. Priority Date: 12/05/2008
• Status: Active Grant

• Current Assignee: valagro carbone renouvelable poitou charentes
• Original Assignee: valagro carbone renouvelable poitou charentes
• Inventors: Barbier, Jacques, Bataille, Frederic, Briand, Alexandre
• Granted Patent: US 9,540,665 B2
• Time in Patent Office: Days
• US Class Current: 435/165
• CPC Class Codes: C12P 7/08 produced as by-product or from waste or cellulosic material substrate
• CPC Class Codes: C12P 7/10 substrate containing cellulosic material
• CPC Class Codes: Y02E 50/10 Biofuels, e.g. bio-diesel

Abstract

Recycled textile cotton is used for producing ethanol by the execution of a process that includes a) a stage of pretreatment of textile cotton, optionally with grinding of textile cotton, pretreatment of textile cotton that may or may not be ground by pulping 5 in an extruder, b) a stage of enzymatic hydrolysis, c) a stage of filtration(s), and d) a stage of fermentation.

Claims

1. Process for the production of ethanol from textile cotton, characterized in that it comprises the following stages:

a) Pretreatment of textile cotton;

Optionally grinding of textile cotton,

Pretreatment of textile cotton that may or may not be ground by pulping in an extruder,

b) Enzymatic hydrolysis,

c) Filtration(s), and

d) Fermentation.

2. Process for the production of ethanol according to claim 1, wherein it comprises a discoloration stage before the fermentation stage.

3. Process for the production of ethanol according to claim 1, wherein stage c) comprises the execution of the following stages:

Filtration to clarify the medium,

Ultrafiltration,

Reverse osmosis,

Discoloration,

Sterile filtration,

Cooling.

4. Process for the production of ethanol according to claim 1, wherein fermentation stage d) is followed by a distillation/dehydration stage.

5. Process for the production of ethanol according to claim 4, wherein the distillation/dehydration stage is executed using a membrane by pervaporation.

6. Process for the production of ethanol according to claim 2, wherein it comprises the series of the following stages:

Grinding of recycled textile cotton,

Pretreatment of ground textile cotton by pulping in a twin-screw extruder at a temperature of between 60°

C. and 180°

C. and in the presence of a quantity of water that represents between 200% and 450% of the mass of said raw material,

Enzymatic hydrolysis using an enzymatic cocktail that consists of cellulases and β

-glucosidase,

Filtration to clarify the medium,

Ultrafiltration for recycling the enzymes of the hydrolysis,

Reverse osmosis for concentrating the permeate,

Discoloration,

Sterile filtration,

Cooling,

Fermentation in a fermenter between 30°

C. and 37°

C., between 7 hours and 24 hours, at a pH of between 3.8 and 5.0, with Saccharomyces cerevisiae,

Microfiltration for recycling yeasts, and

Distillation/dehydration.

7. Process for the production of ethanol according to claim 2, wherein fermentation stage d) is followed by a distillation/dehydration stage.

8. Process for the production of ethanol according to claim 3, wherein fermentation stage d) is followed by a distillation/dehydration stage.

9. Process for the production of ethanol according to claim 3, wherein it comprises the series of the following stages:

Grinding of recycled textile cotton,

Pretreatment of ground textile cotton by pulping in a twin-screw extruder at a temperature of between 60°

C. and 180°

C. and in the presence of a quantity of water that represents between 200% and 450% of the mass of said raw material,

Enzymatic hydrolysis using an enzymatic cocktail that consists of cellulases and β

-glucosidase,

Filtration to clarify the medium,

Ultrafiltration for recycling the enzymes of the hydrolysis,

Reverse osmosis for concentrating the permeate,

Discoloration,

Sterile filtration,

Cooling,

Fermentation in a fermenter between 30°

C. and 37°

C., between 7 hours and 24 hours, at a pH of between 3.8 and 5.0, with Saccharomyces cerevisiae,

Microfiltration for recycling yeasts, and

Distillation/dehydration.

10. Process for the production of ethanol according to claim 4, wherein it comprises the series of the following stages:

Grinding of recycled textile cotton,

Pretreatment of ground textile cotton by pulping in a twin-screw extruder at a temperature of between 60°

C. and 180°

C. and in the presence of a quantity of water that represents between 200% and 450% of the mass of said raw material,

Enzymatic hydrolysis using an enzymatic cocktail that consists of cellulases and β

-glucosidase,

Filtration to clarify the medium,

Ultrafiltration for recycling the enzymes of the hydrolysis,

Reverse osmosis for concentrating the permeate,

Discoloration,

Sterile filtration,

Cooling,

Fermentation in a fermenter between 30°

C. and 37°

C., between 7 hours and 24 hours, at a pH of between 3.8 and 5.0, with Saccharomyces cerevisiae,

Microfiltration for recycling yeasts, and

Distillation/dehydration.