The invention relates to a method and a system for the pretreatment of lignocellulosic material by thermal hydrolysis, in particular with a view to producing bioethenol, wherein the material is first admixed with water and is then passed to a reactor, in which the soaked material is subjected to a h
The invention relates to a method and a system for the pretreatment of lignocellulosic material by thermal hydrolysis, in particular with a view to producing bioethenol, wherein the material is first admixed with water and is then passed to a reactor, in which the soaked material is subjected to a high temperature and a high pressure to such an extent that is it accessible for a subsequent treatment with enzymes, following which the treated material is separated into liquid part and a solid part, where the solid component is subsequently used for the production of bioethenol and enzymation and fermentation. Exclusively steam is used in the method and the corresponding system for heating, stirring and transport, as e.g. the transport through the various elements of the system is provided by a pressure difference between the compartments of the elements. The material (32) is discharged to an economizer (4), in which a separator (5) separates the material into a solid part and a liquid part. The solid part (29) is discharged for use in the further process. The method is performed as a two step proceed, as the material (32) from the first reactor (3) is injected into the economizer (4) and from there further on (26) to an additional reactor (8) for an additional treatment step. A high efficiency is achieved, as all pressures are established by direct steam addition, and heating surfaces and mechanical elements, such as pumps, stirrers, stuffing boxes, bearings, etc. are avoided. The use of economizers (4, 9) improves the consumption of energy relative to previously known processes.
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1. A method of pretreating a lignocellulosic material by thermal hydrolysis, the pretreated material being accessible for a subsequent treatment with enzymes, the pretreated material being suitable for producing bioethanol by enzymation and fermentation, the method exclusively using steam for heatin
1. A method of pretreating a lignocellulosic material by thermal hydrolysis, the pretreated material being accessible for a subsequent treatment with enzymes, the pretreated material being suitable for producing bioethanol by enzymation and fermentation, the method exclusively using steam for heating, mixing and transporting the material through each pretreating step, the method comprising the steps of: admixing the lignocellulosic material with water and/or an aqueous liquid to form a soaked material;transporting the soaked material to a vessel,closing off the vessel and supplying steam to the vessel, to raise a pressure in the vessel to a first pressure, and then discharging the soaked material from the vessel, using steam exclusively for transporting the soaked material to a reactor as the first pressure is higher than a pressure in the reactor,introducing steam to the reactor through one or more nozzles for subjecting the soaked material to a high temperature and a high pressure to such an extent that the lignocellulosic material is prepared and becomes more accessible to enzymes for a subsequent treatment therewith,using exclusively the high pressure of the steam in the reactor for transporting the prepared lignocellulosic material to a separator maintained at a second pressure lower that the reactor pressure,separating the prepared material into a liquid part and a solid part in the separator, the solid part containing the pretreated material accessible for a subsequent treatment with enzymes, and,using exclusively the second pressure for discharging the solid part and the liquid part to locations maintained at pressures lower than the second pressure, such that transporting through each step occurs exclusively by steam generated pressure differences. 2. The method of claim 1 wherein the solid part is discharged for further treatment, and the liquid part is collected and/or recirculated to the vessel for addition to the soaked material. 3. The method according to claim 1, further comprising providing an economizer and incorporating the separator therein. 4. The method according to claim 3, further comprising generating waste steam in the economizer and passing the waste steam to the vessel. 5. The method according to claim 1 further comprising: prior to transporting to the separator, using exclusively the high pressure of the steam in the reactor for transporting the prepared lignocellulosic material to an oxidation reactor maintained at a pressure lower that the reactor pressure;adding oxygen to the prepared lignocellulosic material; and,using exclusively the pressure in the oxidation reactor for transporting the prepared oxygenated lignocellulosic material to the separator maintained at the second pressure which is lower that the oxidation reactor pressure. 6. A method of pretreating a lignocellulosic material by thermal hydrolysis, the pretreated material being accessible for a subsequent treatment with enzymes, the pretreated material being suitable for producing bioethanol by enzymation and fermentation, the method using steam exclusively for heating, mixing and transporting the material through each pretreating step, the method comprising the steps of: admixing the lignocellulosic material with water and/or an aqueous liquid to form a soaked material;transporting the soaked material to a vessel,closing off the vessel and supplying steam to the vessel, to raise a pressure in the vessel to a first pressure, and then discharging the soaked material from the vessel, using steam exclusively for transporting the soaked material to a first reactor as the first pressure is higher than a pressure in the reactor,introducing steam to the reactor through one or more nozzles for subjecting the soaked material to a high temperature and a high pressure to such an extent that the lignocellulosic material becomes more accessible to enzymes for a subsequent treatment therewith,using exclusively the high pressure of the steam in the reactor for transporting the prepared lignocellulosic material to a first separator maintained at a second pressure lower that the reactor pressure,separating the prepared material into a liquid part and a solid part in the first separator,applying steam to the first separator to raise the second pressure thereof for using the steam exclusively for transporting the solid part from the first separator to a second reactor maintained at a pressure lower than the second pressure,introducing steam to the second reactor for subjecting the solid part to a high temperature and a high pressure to such an extent an additional portion of the prepared lignocellulosic material contained in the sold part becomes accessible to enzymes,then using exclusively the pressure of the steam in the second reactor for transporting the prepared lignocellulosic material to a second separator maintained at a third pressure lower that the second reactor pressure,separating the prepared material into a second liquid part and a second solid part in the second separator, the second solid part containing the pretreated material accessible for a subsequent treatment with enzymes, and,using exclusively the third pressure for discharging the second solid part and the liquid part to locations maintained at pressures lower than the third pressure, such that transporting through each step occurs exclusively by steam generated pressure differences. 7. The method according to claim 6, further comprising: adding oxygen to the prepared lignocellulosic material in the first reactor. 8. The method according to claim 6, further comprising: providing an economizer and incorporating the first separator therein. 9. The method according to claim 8, further comprising providing a second economizer and incorporating the second separator therein. 10. The method according to claim 9, further comprising generating waste steam in the second economizer and passing the waste steam to the vessel. 11. The method according to claim 9, further comprising generating waste steam in the economizer and passing the waste steam to the second economizer. 12. The method according to claim 6 further comprising discharging the liquid part from the first separator to a container for collection or recycling to the vessel. 13. The method according to claim 6 further comprising discharging the liquid part from the second separator to a container for collection or recycling to the vessel.
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이 특허에 인용된 특허 (12)
Neves Alan M. (1596 24th St. Ogden UT 84401), Alcohol manufacturing process.
Foody Patrick (3870 Cote Vertu St. Laurent ; Quebec CAX H4R1V4), Method for increasing the accessibility of cellulose in lignocellulosic materials, particularly hardwoods agricultural r.
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