Process for the production of an intermediate product intended for the production of ethanol and for the production of lignin

• US 9,328,457 B2
• Filed: 09/10/2014
• Issued: 05/03/2016
• Est. Priority Date: 12/05/2008
• Status: Active Grant

• Current Assignee: valagro carbone renouvelable poitou charentes, Vavalagro Carbone Renouvelable Poitou-Charentes
• Original Assignee: valagro carbone renouvelable poitou charentes
• Inventors: Barbier, Jacques, Bataille, Frederic, Briand, Alexandre, Soum, Stephane
• Primary Examiner(s): CALANDRA, ANTHONY J
• Application Number:
  US14/482,208
• Publication Number:
  US 20140374040A1
• Time in Patent Office: 601 Days
• Field of Search: 162/24, 162/26, 162/90
• US Class Current: 1/1
• CPC Class Codes: C10L 1/02 essentially based on components consisting of carbon, hydrogen, and oxygen only
• CPC Class Codes: C10L 2290/141 of additive or catalyst
• CPC Class Codes: C10L 2290/146 of water
• CPC Class Codes: C10L 2290/24 Mixing, stirring of fuel components
• CPC Class Codes: C10L 2290/26 Composting, fermenting or anaerobic digestion fuel components or materials from which fuels are prepared
• CPC Class Codes: C10L 2290/50 Screws or pistons for moving along solids
• CPC Class Codes: D21C 1/06 with alkaline reacting compounds
• CPC Class Codes: D21C 11/0007 Recovery of by-products, i.e. compounds other than those necessary for pulping, for multiple uses or not otherwise provided for volatile compounds obtained by decomposition of spent liquors in order to regenerate them D21C11/125; compounds obtained by fractionating the liquors in order to regenerate them D21C11/0042
• CPC Class Codes: D21C 3/00 Pulping cellulose-containing materials digesters D21C7/00
• CPC Class Codes: D21C 3/02 with inorganic bases or alkaline reacting compounds, e.g. sulfate processes

Abstract

A process for producing from a lignocellulosic raw material of (i) an intermediate product that is intended for the production of ethanol, containing polysaccharides, cellulose and hemicelluloses, and (ii) a product containing lignin in an aqueous solution without sulfur residue, this lignin could be precipitated. The process includes a step of pulping the raw material in an 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 and in the presence of a strong base at a concentration of between 0.5% and 4% relative to the volume of water.

Claims

1. A process for producing from a lignocellulosic raw material of:

(i) an intermediate product that is intended for the production of ethanol, containing polysaccharides, cellulose and hemicelluloses, and

(ii) a product containing lignin in an aqueous solution without sulfur residue, this lignin could be precipitated, said process comprising;

mixing said raw material with a first quantity of water and a strong base at a concentration of between 0.5% and 4% relative to the volume of said first quantity of water to form a mixture; and

introducing said mixture and a second quantity of water excluding a strong base into an extruder and pulping said mixture and said second quantity in said extruder at a temperature of between 90°

C. and 120°

C.,

wherein said first quantity and said second quantity of water represent between 300% and 400% of the mass of said raw material.

2. The process according to claim 1 wherein the concentration of strong base relative to the volume of said first quantity of water is between 0.5 and 1.5%.

3. The process according to claim 1, wherein the temperature is between 100°

C. and 110°

C.

4. The process according to claim 1, wherein the lignocellulosic raw material is pulped in a twin-screw extruder.

5. The process according to claim 1, wherein:

said first quantity of water mixed with said raw material represents 200% of the mass of said raw material, and said strong base mixed with said raw material is concentrated at 1% relative to the volume of water,

the mixture introduced into said extruder is at a temperature of 105°

C., and

said second quantity of water excluding a strong base introduced into said extruder with said mixture represents between 100% and 200% of the mass of said raw material.