SE543924C2 - A method for extracting hydrolysate in a batch pulp production process - Google Patents

A method for extracting hydrolysate in a batch pulp production process

Info

Publication number
SE543924C2
SE543924C2 SE1950405A SE1950405A SE543924C2 SE 543924 C2 SE543924 C2 SE 543924C2 SE 1950405 A SE1950405 A SE 1950405A SE 1950405 A SE1950405 A SE 1950405A SE 543924 C2 SE543924 C2 SE 543924C2
Authority
SE
Sweden
Prior art keywords
hydrolysate
batch cooking
cooking vessel
batch
hydrolysis
Prior art date
Application number
SE1950405A
Other languages
Swedish (sv)
Other versions
SE1950405A1 (en
Inventor
Berdine Coetzee
Hunphrey Landman
Johann Wauts
Jouni Karvonen
Lari Lammi
Susanna Minnaar
Original Assignee
Valmet Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valmet Oy filed Critical Valmet Oy
Priority to SE1950405A priority Critical patent/SE543924C2/en
Priority to PCT/SE2020/050253 priority patent/WO2020204780A1/en
Priority to CN202080025317.4A priority patent/CN113692464B/en
Priority to BR112021012894A priority patent/BR112021012894A2/en
Priority to EP20782370.9A priority patent/EP3947807A4/en
Publication of SE1950405A1 publication Critical patent/SE1950405A1/en
Priority to ZA2021/04455A priority patent/ZA202104455B/en
Publication of SE543924C2 publication Critical patent/SE543924C2/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/04—Pretreatment of the finely-divided materials before digesting with acid reacting compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/02—Pretreatment of the finely-divided materials before digesting with water or steam
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0007—Recovery of by-products, i.e. compounds other than those necessary for pulping, for multiple uses or not otherwise provided for
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/008—Prevention of corrosion or formation of deposits on pulp-treating equipment
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P2201/00—Pretreatment of cellulosic or lignocellulosic material for subsequent enzymatic treatment or hydrolysis

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)

Abstract

A method for extracting hydrolysate in a batch cooking process for producing pulp, a hydrolysate extracting arrangement and a batch cooking system. Said method comprising the steps of:- providing lignocellulose raw material to a batch cooking vessel;- performing acid hydrolysis of the lignocellulose raw material in the batch cooking vessel;- removing hydrolysate from the batch cooking vessel; and- cooling the removed hydrolysate.

Description

A method for extracting hvdrolvsate in a batch pulp production process TECHNICAL FIELD The present invention relates to a method for extracting hydrolysate in a batch cookingprocess for producing pulp. It furtherrnore relates to a hydrolysate extracting arrangementconf1gured for extracting hydrolysate in a batch cooking system for producing pulp and to a batch cooking system for producing pulp.
BACKGROUND In some pulp production, for example in dissolving pulp production, lignocellulose rawmaterial is first subject to a hydrolysis for removing unWanted hemicelluloses and then analkaline cooking is performed for removing lignin. The hydrolysis in a batch cooking systemis norrnally performed by adding steam to the lignocellulose raW material. During thehydrolysis the hemicellulose, mainly C5 sugars, are degraded and released from the Wood. Ifthe sugars should be extracted and taken care of a hydrolysate comprising the dissolvedsugars needs to be removed from a vessel Where the hydrolysis is performed before the pH ischanged and an alkaline cooking is performed. In the alkaline cooking process the sugars are broken-down to non-valuable components.
Handling of hydrolysate may be problematic due to its very sticky consistence and tendencyto create scaling for example in pipes, screens and on tank surfaces. When removing hydrolysate from a cooking vessel for extraction of sugar the connection pipes and tanks used in the system for extraction of sugar often have problems With scaling and need to be cleaned.
Any cleaning and interruption in production processes are of course negative.
SUMMARY An object of the present invention is to improve hydrolysate extraction efficiency in a pulp production system.
This is achieved by a method for extracting hydrolysate according to the independent claim.
According to the invention a method for extracting hydrolysate in a batch cooking process for producing pulp is provided, said method comprising the steps of: - providing lignocellulose raw material to a batch cooking vessel; - perforrning acid hydrolysis of the lignocellulose raw material in the batch cookingvessel; - removing hydrolysate from the batch cooking vessel; - cooling the removed hydrolysate on its Way from the batch cooking vessel to ahydrolysate extracting tank to less than 130 °C as soon as possible after removalfrom the batch cooking vessel, Wherein cooling is performed Within a time periodof 0-2 minutes from When the hydrolysate is leaving the batch cooking vessel; and - performing alkaline cooking in the batch cooking vessel after the removing of the hydrolysate.
The invention may be performed in a batch cooking system, Which, hoWever, is not part of theinvention. Such a batch cooking system may comprise a batch cooking vessel and ahydrolysate extracting arrangement, Which hydrolysate extracting arrangement is conf1guredto extract hydrolysate in the batch cooking system, Whereby the hydrolysate extracting arrangement is connected to a hydrolysate outlet of the batch cooking vessel and comprises: - a hydrolysate removing conduit comprising a batch cooking vessel connection,Which is configured to be connected to the hydrolysate outlet of the batch cookingvessel of the batch cooking system; - a hydrolysate extracting tank connected to the hydrolysate removing conduit andconfigured to receive hydrolysate removed from the batch cooking vessel throughthe hydrolysate removing conduit; and - a cooling device configured to cool any hydrolysate removed from the batch cooking vessel.
The invention may be performed in a hydrolysate extracting arrangement conf1gured toextract hydrolysate in a batch cooking system for producing pulp, Which arrangement and system are not part of the invention, said hydrolysate extracting arrangement may comprise: - a hydrolysate removing conduit comprising a batch Cooking vessel connection,Which is configured to be connected to a hydrolysate outlet of a batch cookingvessel of the batch cooking system; - a hydrolysate extracting tank connected to the hydrolysate removing conduit andarranged for receiving hydrolysate removed from the batch cooking vessel throughthe hydrolysate removing conduit; and - a cooling device arranged for cooling any hydrolysate removed from the batch cooking vessel.
Hereby a method according to the invention can be performed in a system for extraction ofhydrolysate in a pulp production system is provided Which is more effective and reliable thanprior art systems. Such a system is, hoWever, not part of the invention. Thanks to the coolingof the hydrolysate after it has been removed from the batch cooking vessel the tendency of thehydrolysate to create scaling is much decreased. When cooling the hydrolysate the furfuralformation is reduced and also the lignin degradation is reduced. This Will reduce the tendencyto build scaling. Furthermore the stability of the sugar solution is radically improved due toloWering the sugar degradation rate and a more effective sugar extraction can be provided. Amore reliable process is provided thanks to less scaling and less need for cleaning of the system and a better sugar yield can be provided thanks to reduced sugar degradation.
In one embodiment of the invention the method further comprises the step of extracting sugar from the removed hydrolysate.
In one embodiment of the invention the batch cooking process is a process for producing dissolving pulp.
In one embodiment of the invention the step of performing acid hydrolysis of thelignocellulose raw material in the batch cooking vessel comprises steam hydrolysis and/or liquid hydrolysis.
According to the invention the step of cooling the removed hydrolysate comprises cooling thehydrolysate to less than l30°C. In one embodiment of the invention the step of cooling theremoved hydrolysate comprises cooling the hydrolysate to less than l20°C. In oneembodiment of the invention the step of cooling the removed hydrolysate comprises cooling the hydrolysate to less than ll0°C.
According to the invention the step of cooling the removed hydrolysate comprises cooling thehydrolysate within a time period of 0-2 minutes from when the hydrolysate is leaving thebatch cooking vessel or within a time period of 0-l minutes from when the hydrolysate is leaving the batch cooking vessel.In one embodiment of the invention the cooling device is a heat exchanger.
The method according to the invention may be performed in a batch cooking system, which,however, is not part of the present invention. In such a system a batch cooking vessel is apressurized vessel and said batch cooking system comprises further a hydrolysis arrangementconnected to the batch cooking vessel and configured for adding a fluid to the batch cookingvessel for performing a hydrolysis of a lignocellulose raw material provided in the batchcooking vessel. The batch cooking vessel and hydrolysis arrangement are not part of the invention.
The hydrolysis arrangement may be configured for adding steam and/or liquid to the batch cooking vessel for performing the hydrolysis.
The batch cooking system may further comprise a liquor adding arrangement connected to thebatch cooking vessel and configured for adding alkaline liquor to the batch cooking vessel forperforming alkaline cooking in the batch cooking vessel after hydrolysis has been performedin the batch cooking vessel and after hydrolysate has been removed out from the batch cooking vessel.
The batch cooking system may be a system for producing dissolving pulp.
BRIEF DESCRIPTION OF THE DRAWINGSFigure l is a schematic illustration a batch cooking system which is not part the invention.
Figure 2 is a flow chart of a method for extracting hydrolysate according to one embodiment of the invention.
DETAILED DESCRIPTION OF EMBODIMENTS Figure 1 shows schematically a batch Cooking system 1 for producing pulp. Said batchcooking system 1, which is not part of the invention, comprises a batch cooking vessel 3 and ahydrolysate extracting arrangement 5, which is not part of the invention and which is connected to a hydrolysate outlet ll of the batch cooking vessel 3.
The batch cooking vessel 3 can be a traditional batch cooking vessel used for production ofpulp. Only some of the components and features in the batch cooking vessel 3 which arerelevant for the invention will be described here. The batch cooking vessel 3 comprises aninlet 4a for receiving a lignocellulose raw material and an outlet 4b for expelling a content ofthe batch cooking vessel 3 after it has been treated in the vessel. The treatment provided to thelignocellulose raw material in the batch cooking vessel 3 comprises first an acid hydrolysisfollowed by an alkaline cooking. The batch cooking vessel 3 is a pressurized vessel. The acidhydrolysis of the lignocellulose raw material is perforrned by the addition of a fluid to thebatch cooking vessel 3. The fluid added can be steam and/or liquid added into the batchcooking vessel 3. The steam and/or liquid can be water and can optionally comprise an acidcomponent for improving hydrolysis. In the case of only water the acid comprised in thelignocellulose material is considered being enough for achieving the hydrolysis. In Figure 1this is illustrated by a hydrolysis arrangement 21 connected to the batch cooking vessel 3which is conf1gured for adding at least one fluid to the batch cooking vessel for performingthe hydrolysis as described above. According to the invention it can be suitable to add a liquidfor the hydrolysis, possibly with a previous steam treatment. The liquid can be for examplewater. According to the invention, which will be described in more detail below, ahydrolysate will be removed from the batch cooking vessel and by adding a liquid forperforming the hydrolysis an extraction of hydrolysate can be more effective. If sugar isextracted from the hydrolysate also this sugar extraction can be more effective when a liquidis added for the hydrolysis compared to a hydrolysis accomplished by the addition of only steam.
The batch cooking vessel 3 further comprises a liquor adding arrangement 27 configured foradding alkaline liquor to the batch cooking vessel 3 for performing alkaline cooking in thebatch cooking vessel 3. The alkaline cooking is perforrned after hydrolysis has beenperforrned in the batch cooking vessel. According to the invention the alkaline cooking is alsoperforrned after a hydrolysate has been removed out from the batch cooking vessel 3. If forexample sugar should be extracted from the hydrolysate, the hydrolysate comprising the dissolved sugars needs to be removed from the batch cooking vessel where the hydrolysis was performed before the pH is changed and an alkaline cooking is perforrned. In the alkalinecooking process the dissolved sugars after the hydrolysis are broken-down to non-valuable components.
According to the invention a hydrolysate should be removed from the batch cooking vessel 3after the hydrolysis has been performed and before an alkaline cooking procedure is started.The hydrolysate is removed through a hydrolysate outlet 11 provided in the batch cookingvessel 3. The hydrolysate outlet 11 can for example be provided in an upper half of the batchcooking vessel. However it can also be provided in a lower half of the batch cooking vessel.The hydrolysate can either be pushed out from the batch cooking vessel 3 by increasingpressure inside the batch cooking vessel, for example by the addition of another fluid to thebatch cooking vessel, for example water or liquor, from for example a bottom part of thebatch cooking vessel 3. Another altemative is to pump or drain out the hydrolysate from the batch cooking vessel 3.
The batch cooking system l can be a system for producing dissolving pulp. When producingdissolving pulp hemicellulose is removed from the lignocellulose raw material by an acid hydrolysis before lignin is removed in the alkaline cooking procedure.
According to the invention a hydrolysate extracting arrangement 5 conf1gured for extractinghydrolysate in a batch cooking system l for producing pulp is provided. Said hydrolysateextracting arrangement 5 is during use connected to a hydrolysate outlet ll of a batch cookingvessel 3 in the batch cooking system l as described above. The hydrolysate extractingarrangement 5 comprises a hydrolysate removing conduit 7 comprising a batch cooking vesselconnection 8, which is configured to be connected to the hydrolysate outlet ll of the batchcooking vessel 3. The hydrolysate extracting arrangement 5 comprises further a hydrolysateextracting tank 13 connected to the hydrolysate removing conduit 7 and arranged forreceiving hydrolysate removed from the batch cooking vessel 3 through the hydrolysateremoving conduit 7 and a cooling device 15 arranged for cooling any hydrolysate removedfrom the batch cooking vessel 3. The cooling device 15 can be provided in connection withthe hydrolysate removing conduit 7 as shown in Figure 1. Altematively the cooling device 15can be provided in connection with the hydrolysate extracting tank 13, for example in acirculation path 16 connected to the hydrolysate extracting tank. However, suitably thehydrolysate should be cooled down as soon as possible after removal from the batch cooking vessel 3. For example the cooling device 15 can be positioned such that cooling of the hydrolysate is performed within a time period of 0-5 minutes from when the hydrolysate isleaving the batch cooking vessel 3 or within a time period of 0-2 minutes from when thehydrolysate is leaving the batch cooking vessel or within a time period of 0-1 minute from when the hydrolysate is leaving the batch cooking vessel.
The cooling device 15 can be arranged to cool the hydrolysate to less than 130°C or less than120°C or less than 110°C. A common temperature of the content in the batch cooking vessel 3can for example be around 170°C. In one embodiment of the invention the cooling device 15is arranged to cool the hydrolysate to a temperature between 70 and 130°C and in oneembodiment of the invention the cooling device 15 is arranged to cool the hydrolysate to atemperature between 80 and 120°C or between 90 and 110°C. By cooling the hydrolysatedown a much more effective extraction of the hydrolysate will be achieved. The hydrolysateis norrnally very sticky and difficult to handle. For example heavy scaling is produced intanks, tubes, circulation lines, screens etc. in equipment used for the handling of hydrolysate.The sticky consistence of the hydrolysate and its tendency to provide scaling is probably dueto furfural which is produced from the dissolved sugars and also due to lignin. The furfuralproduction is a function of time, i.e. longer exposure time of sugars in such conditions leadsto higher furfural concentration in the solution. Lignin content also increases during the hydrolysis time. Scaling consists much of lignin and furfural together with sugars.
Surprisingly it has been found that by cooling down the hydrolysate to for example less thanaround 130°C or less than 120°C or less than 110°C the sticky consistence and tendency toprovide scaling is greatly decreased and extraction of hydrolysis from a pulp productionprocess can be much improved. Hereby also extraction of sugars from a hydrolysate can beimproved. The positive effect of the cooling, i.e. the reduction of scaling, is surprisingly high also for relatively small temperature reductions.
Furthermore in these types of cooking systems for producing pulp it is traditionally veryimportant to keep up the high temperatures of the material in order to avoid energy loss.Hereby it would not be obvious for a skilled person to adopt this solution to cool down the hydrolysis.
The cooling device 15 can be a heat exchanger. Another altemative could be to add cold fluidto the hydrolysate when removed from the batch cooking vessel 3. However, this will dilute the hydrolysate which may not be advantageous in all applications.
Figure 2 is a flow chart of the method according to one embodiment of the invention. Themethod is a method for extracting hydrolysate in a batch cooking process for producing pulp and comprises the steps:Sl: Providing lignocellulose raw material to a batch cooking vessel 3.
S2: Performing acid hydrolysis of the lignocellulose raw material in the batch cooking vessel.This step can comprise steam hydrolysis and/or liquid hydrolysis as described above. Suitablya liquid is added to the batch cooking vessel 3 for the hydrolysis in order to improve hydrolysis extraction.S3: Removing hydrolysate from the batch cooking vessel 3.
S4: Cooling the removed hydrolysate. This step can comprise cooling the hydrolysate to lessthan l30°C or less than l20°C or less than ll0°C as described above. In one embodiment ofthe invention this step can comprise cooling the hydrolysate to a temperature between 70 andl30°C or to a temperature between 80 and l20°C or to a temperature between 90 and ll0°C.Furthermore the cooling is suitably performed as soon as possible after it has been removedfrom the batch cooking vessel 3 in order to avoid scaling in the equipment. The hydrolysate isin one embodiment of the invention cooled on its way from the batch cooking vessel 3 to ahydrolysate extracting tank l3. The step of cooling the removed hydrolysate can comprisecooling the hydrolysate within a time period of 0-5 minutes from when the hydrolysate isleaving the batch cooking vessel or within a time period of 0-2 minutes from when thehydrolysate is leaving the batch cooking vessel or within a time period of 0-l minute fromwhen the hydrolysate is leaving the batch cooking vessel. The step of cooling the removed hydrolysate can comprise cooling the hydrolysate by a heat exchanger l5.
According to some embodiments of the invention the method further comprises the step S5:Extracting sugar from the removed hydrolysate. This step is performed after the step S4 ofcooling the removed hydrolysate. An extraction yield of sugar from the hydrolysate is muchimproved when the hydrolysate has been cooled down according to the invention as describedabove. The stability of the sugar solution is radically improved due to lowering the sugardegradation rate when the hydrolysate is cooled down and a more effective sugar extractioncan be provided. In some embodiments of the invention also lignin can be extracted from the hydrolysate.
According to the inVention, the method coniprises the step S6: Performing alkaline Cooking inthe batch cooking vessel 3 after the renioving of the hydrolysate. The step S6 can be perforrned at any time after the step S3 as described above.

Claims (7)

1. A method for extracting hydrolysate in a batch Cooking process for producing pulp, saidmethod comprising the steps of: - providing lignocellulose raw material to a batch cooking vessel (S 1); - perforrning acid hydrolysis of the lignocellulose raw material in the batch cookingvessel (S2); - removing hydrolysate from the batch cooking vessel (S3); - cooling the removed hydrolysate on its way from the batch cooking vessel to ahydrolysate extracting tank to less than 130 °C as soon as possible after removalfrom the batch cooking vessel (S4), characterized in that cooling is performedwithin a time period of 0-2 minutes from when the hydrolysate is leaving the batchcooking vessel; and - performing alkaline cooking in the batch cooking vessel after the removing of the hydrolysate (S6).
2. Method according to claim 1, characterized in that the method further comprises the step of extracting sugar from the removed hydrolysate (S5).
3. Method according to any one of the preceding claims, characterized in that the batch cooking process is a process for producing dissolving pulp.
4. Method according to any one of the preceding claims, characterized in that the step ofperforming acid hydrolysis of the lignocellulose raw material in the batch cooking vessel (S2) comprises steam hydrolysis and/or liquid hydrolysis.
5. Method according to any one of the preceding claims, characterized in that the step ofcooling the removed hydrolysate (S4) comprises cooling the hydrolysate to less than 120 °C or less than 110 °C.
6. Method according to any one of the preceding claims, characterized in that the step ofcooling the removed hydrolysate (S4) comprises cooling the hydrolysate within a time period of 0-1 minute from when the hydrolysate is leaving the batch cooking vessel.
7. Method according to any one of the preceding claims, characterized in that the step ofcooling the removed hydrolysate (S4) comprises cooling the hydrolysate by a heat exchanger.
SE1950405A 2019-04-02 2019-04-02 A method for extracting hydrolysate in a batch pulp production process SE543924C2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
SE1950405A SE543924C2 (en) 2019-04-02 2019-04-02 A method for extracting hydrolysate in a batch pulp production process
PCT/SE2020/050253 WO2020204780A1 (en) 2019-04-02 2020-03-09 A method and arrangement in a batch pulp production process
CN202080025317.4A CN113692464B (en) 2019-04-02 2020-03-09 Method and arrangement in a batch pulping process
BR112021012894A BR112021012894A2 (en) 2019-04-02 2020-03-09 Method for hydrolyzate extraction, batch cooking system, and hydrolyzate extraction arrangement
EP20782370.9A EP3947807A4 (en) 2019-04-02 2020-03-09 A method and arrangement in a batch pulp production process
ZA2021/04455A ZA202104455B (en) 2019-04-02 2021-06-28 A method and arrangement in a batch pulp production process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1950405A SE543924C2 (en) 2019-04-02 2019-04-02 A method for extracting hydrolysate in a batch pulp production process

Publications (2)

Publication Number Publication Date
SE1950405A1 SE1950405A1 (en) 2020-10-03
SE543924C2 true SE543924C2 (en) 2021-09-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
SE1950405A SE543924C2 (en) 2019-04-02 2019-04-02 A method for extracting hydrolysate in a batch pulp production process

Country Status (6)

Country Link
EP (1) EP3947807A4 (en)
CN (1) CN113692464B (en)
BR (1) BR112021012894A2 (en)
SE (1) SE543924C2 (en)
WO (1) WO2020204780A1 (en)
ZA (1) ZA202104455B (en)

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US20050161038A1 (en) * 1999-06-23 2005-07-28 Pinatti Daltro G. Process for carrying out pre-hydrolysis of a biomass
US20090093028A1 (en) * 2007-10-05 2009-04-09 Joy Doran Peterson Apparatus and methods for treating biomass
EP2430233A1 (en) * 2010-03-11 2012-03-21 Metso Paper, Inc. Method for producing pulp
CN103451987A (en) * 2013-08-23 2013-12-18 湖南骏泰浆纸有限责任公司 Method and device for extracting pre-hydrolysis liquid from dissolving pulp
WO2017142445A1 (en) * 2016-02-16 2017-08-24 Valmet Ab Method for recovering concentrated hydrolysate after hydrolysis of cellulose material

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AT398588B (en) * 1992-12-02 1994-12-27 Voest Alpine Ind Anlagen METHOD FOR THE PRODUCTION OF VISCOSE CELLS
US6176971B1 (en) * 1998-11-18 2001-01-23 Andritz-Ahlstrom Inc. Heat economy enhancements for the recovery and use of energy obtained from spent cooking liquors
US6603026B2 (en) * 2001-08-07 2003-08-05 Gene E. Lightner Heterocyclic compounds produced from biomass
FI123036B (en) 2006-02-10 2012-10-15 Metso Paper Inc Method for recovering hydrolysis products
BR112014028021B1 (en) * 2012-05-17 2021-08-03 Shell Internationale Research Maatschappij B.V. METHOD FOR PRODUCING VOLATILE ORGANIC COMPOUNDS FROM BIOMASS MATERIAL
WO2017088061A1 (en) * 2015-11-25 2017-06-01 Iogen Energy Corporation System and method for cooling pretreated biomass

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050161038A1 (en) * 1999-06-23 2005-07-28 Pinatti Daltro G. Process for carrying out pre-hydrolysis of a biomass
US20090093028A1 (en) * 2007-10-05 2009-04-09 Joy Doran Peterson Apparatus and methods for treating biomass
EP2430233A1 (en) * 2010-03-11 2012-03-21 Metso Paper, Inc. Method for producing pulp
CN103451987A (en) * 2013-08-23 2013-12-18 湖南骏泰浆纸有限责任公司 Method and device for extracting pre-hydrolysis liquid from dissolving pulp
WO2017142445A1 (en) * 2016-02-16 2017-08-24 Valmet Ab Method for recovering concentrated hydrolysate after hydrolysis of cellulose material

Also Published As

Publication number Publication date
CN113692464A (en) 2021-11-23
EP3947807A4 (en) 2023-01-04
SE1950405A1 (en) 2020-10-03
WO2020204780A1 (en) 2020-10-08
CN113692464B (en) 2022-09-16
ZA202104455B (en) 2023-11-29
EP3947807A1 (en) 2022-02-09
BR112021012894A2 (en) 2021-11-09

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