EP0366138B1 - Verfahren zur Aufbereitung von Brennstoff aus Lignozellulose-Material - Google Patents

Verfahren zur Aufbereitung von Brennstoff aus Lignozellulose-Material Download PDF

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Publication number
EP0366138B1
EP0366138B1 EP19890119931 EP89119931A EP0366138B1 EP 0366138 B1 EP0366138 B1 EP 0366138B1 EP 19890119931 EP19890119931 EP 19890119931 EP 89119931 A EP89119931 A EP 89119931A EP 0366138 B1 EP0366138 B1 EP 0366138B1
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Prior art keywords
process according
cellulose
lignin
ligno
heat
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Expired - Lifetime
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EP19890119931
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English (en)
French (fr)
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EP0366138A2 (de
EP0366138A3 (en
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J.W. Jelks
Baron Howard Steven Strouth
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
    • C10G1/002—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal in combination with oil conversion- or refining processes

Definitions

  • the invention relates to a process as stated in the prior art portion of claim 1.
  • a process comprising the steps of reacting the ligno-cellulose material with sulfur dioxide and water under heat and pressure by introducing steam; mixing the reacted material from the first step with an alkaline solution to dissolve the reacted lignin; and washing the material from the second step to remove the dissolved lignin from the rest of the mixture, is known from EP-B 105 937 by the applicant. It had been known for quite some time (US-A 4 053 645) to increase the digestability of cellulosic material by converting it to a sugar and saccharine compound which can be used for feeding animals. This compound, also, can be fermented and distilled, leading to alcohol which can be used as fuel. This can be carried out in a self-contained process.
  • Fermentation is a batch-process and usually requires 12 to 24 hours, depending upon the type of cellulose derived from the raw material. Thus, this fermentation step considerably limits the productivity of the prior art process. Further, the distillation for separating the different alcohol and ether compounds requires a lot of energy and causes high expenses.
  • the invention aims to enhance the productivity limits and to save costs, working time and energy consumption. This is achieved by the invention characterized in the claims.
  • fermentation is eliminated and a high yield is gained, and it is also possible to eliminate distillation.
  • cracking is carried out, and particularly not only on the basis of the cellulose material but also on the basis of the lignin contained in the biomass, the process comprising the steps of pyrolyzing the ligno-cellulose material so as to crack it and obtain gaseous pyrolyzis products, and carrying out a catalytic condensation reaction of the pyrolyzis products to result in a series of compounds from which such usables as fuel are separated.
  • claims 2 and 3 serve to obtain a very suitable fine-grain powder as defined in claim 4, the particular digestion step leading to a very brittle wood material which can easily be ground.
  • the chemical treatment of the biomass is preferably as described in another context in US-PS 4 053 645.
  • the pulverized biomass is transported into contact with the catalyst by means of a fluid stream which preferably is superheated steam which proves the cheapest while at the same time heating the reaction zone.
  • the process can be carried out for increased energy saving in the manner as defined in claim 9, using immediately part of the product which part might be less suitable as fuel, for the system heating. Further, it is possible to re-cycle part of the product so as to support transport and reaction.
  • the drawing shows schematic arrangements of process steps and of apparatuses which may be employed in practising the invention.
  • first and second globe rotary digesters 10 and 12 are shown. While only two digesters are shown, it is possible to use only a single digester or any number of digesters for the purposes of this invention. The use of more than one digester, however, is preferred since the reaction which takes place within each of the digesters is a batch process. By using a plurality of digesters the procedure can be carried out as a continuous process.
  • Each of the globe rotary digesters 10, 12 is an apparatus which is used to subject the contents to heat and pressure while the contents is being mixed. Any device which accomplishes these results would be within the scope of the invention, whether carried out as a batch process or a continuous process.
  • a ligno-cellulose material cut into small pieces is deposited in digester 10 to substantially fill the digester, however leaving sufficient room so that the material will mix as the digester rotates.
  • the chosen ligno-cellulose may be any type of wood, straw, bagasse, nut hulls, seed hulls, etc.
  • the woody material is first chopped or ground into particles.
  • the size of the particles should be not more than approximately 7 mm (1/4") but may be as fine as desired.
  • the size of the particles is not important except that it is apparent that the smaller the particles the more expeditious will be the subsequent reaction. Thus the particle size is a matter of engineering trade-off between the cost of reducing the ligno-cellulose material to smaller sizes versus the time utilized in the steps of reaction.
  • the ligno-cellulose material (hereinafter called wood) is deposited in digester 10, water and sulfur dioxide are added.
  • the water is added at a ratio of approximately 40% by weight of water to the dry weight of the wood.
  • Sulfur dioxide is added in form of a gas at a ratio by weight of 1 ⁇ 2 to 6% of the dry weight of the wood.
  • the quantity of sulfur dioxide is predicated upon the percentage of lignin compared to cellulose contained in the wood.
  • the quantity of lignin is less when cottonwood species is used as a raw material, compared to greater percentage when oak or pine are used as raw material with the quantity of sulfur dioxide adjusted, accordingly.
  • the contents of the digester 10 are pressurized by the introduction of steam.
  • Sufficient steam is introduced to bring the temperature of the reaction mixture to between 44°C and 200°C, a range between 49°C and 200°C being preferred, and at a pressure of between 2463 and 15750 hPa (35 and 225 psi).
  • the mixture is cooked at this pressure and temperature for a period of 40 minutes to 1 hour.
  • the duration is determined by the particulate size of the wood raw material and the characteristics of the material.
  • a valve 14 is opened to allow steam to escape to the atmosphere.
  • the loading door is opened and the contents discharge onto a digester pump pit 16.
  • the digester is emptied, it is refilled with wood type material, water, and sulfur dioxide and the process is repeated.
  • the second digester 12 it can be seen that one digester may be in the process of being emptied and refilled while the other digester is in the cooking cycle so that reacted raw material is deposited into the digester pump pit 16 on a more frequent basis.
  • the input can be even more frequent so that the digester pump pit 16 always contains a quantity of reacted material for subsequent processing on a continuous basis.
  • the reacted material in digester pit 16 is in the form of a slurry and, if necessary, additional water may be added to the pit to maintain the slurry as a pumpable mixture.
  • the digester pump pit includes stirring apparatus 18 to make sure the reacted material does settle out and is retained as a pumpable slurry.
  • a pump 20 By means of a pump 20 the slurry is conducted to a mixing box 22 where the mixture is mixed with an alkaline solution from line 24.
  • the source of the alkaline solution which is conducted through line 24 can be that a combustible fuel is made for burning in a boiler to produce at least part of the necessary heat from the dissolved lignin, and that waste heat from the cracking reaction chamber is collected to produce hot steam, the ash resulting from burning being used to provide the alkaline solution to dissolve the modified lignin.
  • the reaction of the wood in digesters 10 and 12 is such that the sulfur dioxide in the presence of water reacts with the lignin content of the wood to enhance the solubility of the lignin content without destroying the carbohydrate content.
  • Lignin is a fairly complex organic material, varying somewhat from one plant species to another and the exact reaction with sulfur dioxide is not precisely known; however, it has been experimentally verified that the reaction of the sulfur dioxide and wood produces a solution wherein when mixed with an alkaline solution the lignin is dissolved.
  • the processed mixture and alkaline solution flows out of mixing box 22 through line 26 into a vacuum washer 28 for separating lignin and cellulose materials.
  • This apparatus is a known type of equipment utilized in the chemical processing industry, and particularly in the paper making industry. Therefore, it is well understood by practitioners in the art and will not be described in detail. Suffice it to say that in a vacuum washer a cylinder is equipped which is rotated in the solution. The interior of the cylinder is impressed with a vacuum. Water is sprayed onto the cylinder from above the solution to wash away the dissolved matter, the cellulose material, being fibrous in nature, forms a mat on the cylinder. The fresh water utilized to wash the lignin content from the matted cellulose is supplied by line 30.
  • the vacuum required by the washer 28 may be supplied by a vacuum pump or by means of, as illustrated, a barometric leg 32 which communicates with an overflow box 34.
  • the dissolved lignin is carried out of the overflow box 34 by a line 36 while the cellulose is rolled off the vacuum forming cylinder into a receiving box 38.
  • This matted material is still in a slurry form and is carried by a pump 40 into a second mixing box 42 where the cellulosic material is mixed with water from line 30.
  • the washing procedure is repeated in a second vacuum washer 44 having a barometric leg 46 and overflow box 48 by which the overflow liquid content is carried away from the vacuum washer.
  • the matted cellulose content is rolled off the cylinder into a receiving box 50.
  • the content of receiving box 50 is properly washed material which has more than 95% of the original lignin content removed. It is passed on via a line 52.
  • vacuum washers 28 and 44 While the use of vacuum washers 28 and 44 has been illustrated herein, it is understood that alternate washing procedures can be used in practice of the invention and that the particular means of washing the reacted ligno-cellulose material mixed with an alkaline solution is not a critical element in the practice of the invention and that other known washing systems may be employed. The essence of the washing step is simply to separate the dissolved lignin content from the cellulose material.
  • the materials needed in the process include sulfur dioxide, a metal iron catalyst from that group of metals having a valence of 3, an alkaline solution, water, heat and steam, produced by the process itself.
  • the lignin solution from overflow box 48 is taken by line 90 to line 36.
  • the lignin solutions from overflow boxes 34 and 44 are carried by line 36 to a set of multi-effect evaporators 98, 100, and 102.
  • the number of such evaporators may be varied.
  • the purpose of the evaporators is to evaporate the water content from the dissolved liquid solution.
  • steam is applied from a line 104 to a heat exchanger 106 in evaporator 102.
  • Steam from evaporator 102 is passed by line 108 to a heat exchanger 110 in evaporator 100.
  • steam from evaporator 100 is passed by line 112 to a heat exchanger 114 in evaporator 98.
  • the condensate from evaporator 98 is passed by line 116 into evaporator 100.
  • the condensate from evaporator 100 is passed by line 118 into evaporator 102.
  • the condensate from evaporator 102 is passed by line 120 into a dryer 202.
  • the lignin content of the solution from the overflow box 34 will normally be of about 20% solids, more or less, and the balance liquid. This solution will be concentrated so that the ligning content passing from the multi-effective evaporators in line 120 will be about 55% more or less.
  • Steam from a boiler 96 passing out through steam line 126 is conveyed to a turbine generator 130 to produce electrical energy.
  • the turbine is preferably of the bleeder type which generates electricity and provides process steam by bleeding it from an intermediate point in the turbine at line 104.
  • This process steam is partly carried by a line 134 to the globe rotary digesters 10 and 12 and partly by line 104 to the multi-effect evaporator 102.
  • Spent steam from the multi-effect evaporators may be collected by apparatus not shown and condensed to provide the water which is reused for input into the globe digesters 10, 12, the mixing box 42, and to spray water on the washers 28 and 44.
  • the material supplied through line 52 is a cellulosic slurry which contains high sugar and saccarine values, approximately 95% of the original lignin having been eliminated.
  • This slurry from receiving box 50 is supplied by a pump 201 to the dryer 202 which also receives the concentrated lignin solution from line 120 and receives heating steam from the turbine 130 via line 104.
  • the dryer 202 the already more or less concentrated slurry material is fully dried and sent via a line 203 to a pulverizer 204 where it is pulverized to a very fine dry powder, sufficiently fine to pass a screen with 150 ⁇ m passages (a 100-mesh screen).
  • the pulverized material is transported to a cracker/reformer 205 wherein, in a same reaction zone, the powder is cracked by pyrolyzation and is reformed by condensation.
  • the powdered biomass is introduced into a hot environment, i.e. in a catalyst bed being fluidized by a carrying gas which preferably is superheated steam which is cheapest to arrange, or is an inert gas which may be cold or warm up to 110 to 160°C, which is a temperature well below the temperature where pyrolyzis starts.
  • the fluidized bed of the catalyst has a much higher temperature, the carrier gas thereof - of the same kind as the transporting carrier gas for the biomass - being revolved by a blower pump 206 and in this cycle being heated by a heater 207.
  • the biomass powder entering the reaction zone is heated and pyrolyzis takes place, resulting in fragmented molecules which enter the catalyst immediately and chemically condense in contact therewith to form mainly liquid materials satisfactory for use as gasoline fuel or to be blended with gasoline.
  • the catalyst is a zeolite type catalyst, i.e. ZSM-5.
  • the reaction products of the cracking and reforming process are transported via a line 143 to a separation column 145.
  • the separation column breaks down the cracked materials into various fractions.
  • the material enters as a mixture of hot vapours the column and therein rises through the bubble caps and condenses on different trays.
  • the lighter fractions do not condense until they reach the cooler trays, i.e. the more up trays.
  • Part of this gas is recirculated to the cracker/reformer 205, and part of it as well as the non-condensable gas from the column 145 is transported via a line 212 or 213, respectively, to the boiler 96 which also has a supply 214 of combustion air, for heating and thus generating process steam.
  • Fig. 2 shows a variant of the process.
  • the biomass i.e. saw dust, chips etc.
  • the biomass is mixed in a mixer 301 with a reaction solution coming via a line 302 and a pump 303 from a mix tank 304 which is supplied by water, reactant and activator as described somewhat later.
  • the mixture of biomass and solution is supplied by a line 307 to a wet chip storage and cooking tank 308 where it is subjected to boiling temperature and from there to a dryer 309 which is combined with a furnace 310 for delivering heat for drying.
  • the bone-dry, brittle biomass is transported, via a blower 311 and a separator 313, to a dry chip storage 314 and from there, via a feeder 315, to a mill 316 grinding the dry chips to a fine powder similarly to be specified as in the description of Fig. 1.
  • the powder passes again a separator 320, a storage 321, a powder feeder 322 and then, transported by a carrier gas stream 323, enters cracker/reformer 325 combined with a catalyst bed heater 326.
  • the output of the cracker/reformer 325 passes a cooler 327 and then is supplied via a line 328 to separation column 330 from which the different final products are extracted and stored in storage tanks, a tank 331 for light, a tank 332 for medium and a tank 333 for heavy hydrocarbons. Tar products are re-cycled to the cracker/reformer 325 via a line 335 for renewed processing.
  • the reactant and activator comprise an oxydizing acid like nitric acid (HNO3), a non-oxidizing acid such as sulfuric, phosphoric, hydrochloric or acetic acid and a trivalent metal such as iron which has the function of a catalyst.
  • oxydizing acid like nitric acid (HNO3)
  • non-oxidizing acid such as sulfuric, phosphoric, hydrochloric or acetic acid
  • a trivalent metal such as iron which has the function of a catalyst.
  • Nitric acid which serves to deliver some required oxygen is requested in an amount of approximately 2 to 30 grams per kg of dry weight of the biomass.
  • the materials are cooked, if necessary under pressure, with the effect of attacking the lignin-cellulose bond and downgrading and saturating the cellulose, and then are carefully dried resulting in a very brittle material which can easily be ground to the required fine powder, demanding only rather low grinding energy. Careful drying will help to circumvent the application of pressure during digestion in the cooking step.

Claims (13)

  1. Verfahren zum Herstellen von Treibstoff aus Lignozellulose-Material, das durchzuführen ist durch die Schritte des Pyrolysierens des Lignozellulose-Materials so, daß dieses gekrackt wird und Pyrolyse-Produkte erhalten werden, und des Durchführens einer katalytischen Kondensationsreaktion der Pyrolyseprodukte zum Erhalten einer Reihe von Verbindungen, aus denen verwendbare Treibstoffe separiert werden, dadurch gekennzeichnet, daß man vor dem Pyrolysieren das Lignozellulose-Material zu einer Korngröße von weniger als 150 µm (entsprechend weniger als 100 mesh) pulverisiert und daß die Pyrolisierung und die katalytische Reaktion in einer und derselben Hochtemperatur-Reaktionszone stattfinden, in die man das pulverisierte Material transportiert, so daß es mit dem Katalysator gemischt wird, der von der Zeolit-Art ist.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man das Lignozellulose-Material, bevor es pulverisiert wird, dem Aufschließen unterwirft, indem man das Material Hitze und Druck in Anwesenheit von Wasser und Schwefeldioxid unterwirft, während man es mischt.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man das Lignozellulose-Material für das Aufschließen durch die Behandlung des Materials unter Hitze und Druck in Anwesenheit von Wasser und Schwefeldioxid, während man es mischt, und für die Pulverisierung saturiert, und zwar durch eine Behandlung mit einer Säure mit einem dreiwertigen Metallion unter Hitze und Druck, wodurch die Lignin-Zellulose-Bindung angegriffen wird und die Zellulose degradiert wird, und man es dann trocknet und mahlt.
  4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man das Lignozellulose-Material für das Aufschließen durch die Behandlung des Materials unter Hitze und Druck in Anwesenheit von Wasser und Schwefeldioxid, während man es mischt, saturiert, und zwar durch eine Behandlung mit einer Säure mit einem dreiwertigen Metallion, wobei das saturierte Zellulose-Material unter Bedingungen der Verwendung von trockener Luft bei einer Temperatur unter 100°C getrocknet wird, wodurch die Lignin-Zellulose-Bindung angegriffen wird und die Zellulose zum Mahlen degradiert wird.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß man das pulverisierte Material und das Katalysatorpulver durch einen fluidisierten Strom in eine Reaktionskammer transportiert.
  6. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Reaktionszone ein das Katalysatorpulver tragendes Fließbett ist und daß man das pulverisierte Material durch einen fluidisierten Strom in diese Zone bläst.
  7. Verfahren nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß der fluidisierte Strom aus überhitztem Wasserdampf besteht.
  8. Verfahren nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß der fluidisierte Strom aus einem inerten Gas mit einer Temperatur, die unter der für die Pyrolyse der Biomasse erforderlichen Temperatur liegt, besteht.
  9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß das Lignin-Material und das Zellulose-Material für die Verarbeitung getrennt werden und spätestens vor dem Schritt des Krackens wieder kombiniert werden.
  10. Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß zum Brennen in einem Heizkessel (96) ein brennbarer Brennstoff zum Erzeugen von wenigstens einem Teil der erforderlichen Wärme aus dem aufgelösten Lignin hergestellt wird und daß Abfallwärme aus der Krack-Reaktionskammer zur Erzeugung von Heißdampf gesammelt wird.
  11. Verfahren nach Anspruch 10, dadurch gekennzeichnet, daß man die aus dem Verbrennen resultierende Asche dazu verwendet, eine Alkali-Lösung zu schaffen, um modifiziertes Lignin aufzulösen.
  12. Verfahren nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß man eine Separierung durchführt, indem man den Ausgangsstrom der chemischen Produkte eine Separier-Kolonne einspeist.
  13. Verfahren nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, daß die Temperatur in der Reaktionszone 250°C bis 600°C beträgt.
EP19890119931 1988-10-27 1989-10-26 Verfahren zur Aufbereitung von Brennstoff aus Lignozellulose-Material Expired - Lifetime EP0366138B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP88117948 1988-10-27
EP88117948 1988-10-27

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EP0366138A2 EP0366138A2 (de) 1990-05-02
EP0366138A3 EP0366138A3 (en) 1990-12-19
EP0366138B1 true EP0366138B1 (de) 1994-08-03

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WO2009146225A1 (en) * 2008-05-30 2009-12-03 Uop Llc Slurry hydroconversion of biorenewable feedstocks

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GB9819623D0 (en) * 1998-09-10 1998-11-04 Cap Coder Ltd Ink capsule for a printer
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AU2012202587B2 (en) * 2005-04-29 2014-10-09 Altaca Insaat Ve Dis Ticaret A.S. Method and apparatus for converting organic material
UA96572C2 (ru) * 2005-04-29 2011-11-25 Скф Технолоджис А/С Способ, аппарат и установка для переработки органического материала в углеводородное топливо
WO2007059783A1 (en) * 2005-11-24 2007-05-31 Scf Technologies A/S Method and apparatus for converting organic material using microwave excitation
US8153850B2 (en) 2007-05-11 2012-04-10 The Texas A&M University System Integrated biofuel production system
US20080280338A1 (en) * 2007-05-11 2008-11-13 Hall Kenneth R Biofuel Processing System
EP2449057B1 (de) * 2009-07-01 2021-08-11 Circa Group PTY Ltd Verfahren zur umwandlung lignozellulosehaltiger materialien in nützliche chemikalien
CA2772257C (en) 2010-04-27 2015-06-30 Yun BAO Carbohydrates upgrading and hydrotreating to hydrocarbons
WO2011141546A2 (en) 2010-05-12 2011-11-17 Shell Internationale Research Maatschappij B.V. Process for liquefying a cellulosic material
US8993818B2 (en) 2010-10-14 2015-03-31 Phillips 66 Company Combination of zeolite upgrading with hydrogenation upgrading to produce renewable gasoline from biomass
WO2013072383A1 (en) * 2011-11-14 2013-05-23 Shell Internationale Research Maatschappij B.V. Process for conversion of a cellulosic material
FR3095656B1 (fr) * 2019-05-03 2021-11-12 Europeenne De Biomasse Procédé de traitement de biomasse solide par vapocraquage intégrant l’énergie des coproduits

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EP0105937B1 (de) * 1982-10-04 1987-11-19 Baron Howard Steven Strouth Verfahren zur Gewinnung von Alkohol aus Lignozellulosematerialien
GB8511587D0 (en) * 1985-05-08 1985-06-12 Shell Int Research Producing hydrocarbon-containing liquids

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009146225A1 (en) * 2008-05-30 2009-12-03 Uop Llc Slurry hydroconversion of biorenewable feedstocks
US8022259B2 (en) 2008-05-30 2011-09-20 Uop Llc Slurry hydroconversion of biorenewable feedstocks

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EP0366138A2 (de) 1990-05-02
DE68917253T2 (de) 1995-01-19
DE68917253D1 (de) 1994-09-08
EP0366138A3 (en) 1990-12-19

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