CA1110986A - Production of ethanol - Google Patents
Production of ethanolInfo
- Publication number
- CA1110986A CA1110986A CA340,061A CA340061A CA1110986A CA 1110986 A CA1110986 A CA 1110986A CA 340061 A CA340061 A CA 340061A CA 1110986 A CA1110986 A CA 1110986A
- Authority
- CA
- Canada
- Prior art keywords
- flow
- separated
- substrate
- fermenter
- solid substance
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
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Classifications
-
- 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
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/02—Preparation of oxygen-containing organic compounds containing a hydroxy group
- C12P7/04—Preparation of oxygen-containing organic compounds containing a hydroxy group acyclic
- C12P7/06—Ethanol, i.e. non-beverage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/582—Recycling of unreacted starting or intermediate materials
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- Organic Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Zoology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Microbiology (AREA)
- General Chemical & Material Sciences (AREA)
- Biotechnology (AREA)
- Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Bioinformatics & Cheminformatics (AREA)
- General Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Genetics & Genomics (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Apparatus Associated With Microorganisms And Enzymes (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
Abstract
ABSTRACT
In a production of ethanol in plants, comprising a fermenter, a centrifugal separator for the recirculation of the yeast to the fermenter and a plant for the separation of a yeast-free flow, coming from the centrifugal separator, into one flow, rich in ethanol, and into one residual flow, the substrate, that is fed to the fermenter must be rid of solid substance, like fibres etc. In the separation of such solid substance a certain amount of substrate has been lost according to the methods utilized hitherto, or an unnecessarily high consumption of water and energy has occurred. According to the invention the solid sub-stance, which is separated from the raw material flow, is washed, preferably countercurrently with said residual. flow, which in turn, enriched in substrate, is fed to the fermenter. If a distillative method is used for said separation the residual flow is called slop.
In a production of ethanol in plants, comprising a fermenter, a centrifugal separator for the recirculation of the yeast to the fermenter and a plant for the separation of a yeast-free flow, coming from the centrifugal separator, into one flow, rich in ethanol, and into one residual flow, the substrate, that is fed to the fermenter must be rid of solid substance, like fibres etc. In the separation of such solid substance a certain amount of substrate has been lost according to the methods utilized hitherto, or an unnecessarily high consumption of water and energy has occurred. According to the invention the solid sub-stance, which is separated from the raw material flow, is washed, preferably countercurrently with said residual. flow, which in turn, enriched in substrate, is fed to the fermenter. If a distillative method is used for said separation the residual flow is called slop.
Description
'986 The present invention relates to a method for the production of ethanol, from a raw mateIial flow, conSistirlg of a carbohydrate-containing substIate "nixed with cellulosc-containing fibres and/or other nonfel~entable, solid material, said raw material flow being separated into one flow rich in solid sllbstance and one substrate flow, free from solid substance, which ]ast flow is fermented in one or several fermenters, a flow of feI~entation liquor bein~ separated by centrifug~l separation, into at least one yeast concentrate flow and one yeast-free flow, of which the yeast concentrate flow is recirculated to the fermenter, while the yeast-free flow is separated into one flow, enriched in ethznol, and one residual flow, of which at least part is recirculated to the feL~nenter.
Ethanoi can be manufactured from several types of raw r~lztcrials of vegetable origin. ~nese ~aw materials all contain, or are brought -to contain some fe~-mentable carbohydrate, dissolved in water to a more or less high cGncentration.
~epending on the processes, which the raw materia]s hizve been subject to, in order to reach at least a certain content of fe~qentable carbchydra'es, such as en%ymatic or acid hydro]ysis of starch or li~line-containing cellulose rzw materials, the substrate, which shall be fe~mented into e-thc-Lnol, is more or less miY.ed with nonfeImentable solid r~atter l-ke cellulose fibres, hulls, lignine etc.
~nen conceiving fermentation processes for the prGduction of e-hanol it is ai~edat mi~ ni~ing the ener~y demænd ~ld the ~ater cons~Jnptio3l, and increasing thesu~r yield zs far ~s possible.
: "locess, ;:hich meets Ihese demand, as far as 'he raw ~~lerial is not too L-Juch conte~inated by fib~es, hulls, etc. s clescribed in the S:~e~ish pztent applica-t-on No. 78011~-5, which is con^erned with a T~ethcd for t e plGC'a~CtiOn of a ~olatile c-~a~ic co--ipGund, in p-rt~c-il^- etha!Gl, by COI-~tin'~CUS fe'-..ell~a'tiCn 9~,6 of 2 c~ o!~ o!l v': i 11 i.l ~ ' ll v.i ~. `: ' ;- ; 1. ~ I ~' f lll~.~ll t ? , ~.n~ ;.n ~ c}. ~ cte-r~ g f~a'~ re is~ t}lat a flow of ïe-~ t ticn ~ 0r is separated, by ccntr~-fllg~ e~iLration~ into at ]east one y.oss~ OO:.o?r1-urate flow a~d one yeast-free flow, oi which the ye~ t concentrate fl.ow is :recirculated to the fermenter, while the yea.st-free flow is separated into one f~.ow, enriched in vola-tlle organic compound, which is dischargred, a~d a res1dllal flow, of ~hich at ieast part .s recircu1.ated to the fe77nenter.
If the raw material contains fibres, these rnus~t be removed before the raw ma-terial flow is fed to the felmenter, in such a rprocec6. Othe-~lise it woll]d be.,npossible to perferolD the reci.-rculation of yeast ~ithout a si~ult~neous re-eirculation of said solid IDatter. For this re~ison, the raw rnateIia.l flow fed is usually separated into one substrate flow, which is fed to the fe~menter, and one flow, rieh in solid substance, by centrifl~f~l separation, said last flow bein~ washed with water, which after washing is enriched with substrate, adheri.ng to the solid substanee, and is fed to the fe~qenter. It is t~ue that such a mode of operation would make possible the perfoImance of the rnethod according to the Swedish Patent App].ication No. 7801133-5, but it would mean an increased, nondesirable cons~qption of l13ter end energy.
It is the object of the present inventior, to create a lqethod of the type mentioned by way of introduction, in wl1ich the energy demand and the water con--sumption is minimi~ed, while the sugar yield is as high as possible.
According to the present invention this -,roblem is solved by brlnging the flow,rich in solid substance, into contact wivh at least part of the residual flow, the mi~ture thus obtained being separc~t.^-d rartly into a flow of solid substance, from which remaining substrate has sub t.~ltially been rernoved, and p~rtly intoone flow, em~iched in substrate, ~;hi.ch f1Gw is recirculated to the fe~menter.
In one suitable e!nbodiment of the me~hcd according to the invention, s?id mix-ture is se-parated by at least one ser)2rc~t`on ~le3~s in the foL~ of a sieve meens, a flow rich in solid rr!attc-r being fec' to said sieve mec^~s togethe~ ith at lea.st part of said residual flow and se~.arcated pLr~ly into one .solid ;r,nasefr2ction, which is preve-rlted in a Wây 'r-!~r.;lll ?'r se to pacs the sieve -~ec-ns ithout foI~ing a filtering la~er on s~r~ -nd partly into one liquid frc-ct~on, er~iched in substrate, ~hich frectic-i is '-ou~ht to pcass sa~id s-e;es ~.ci~s, end is rc-cireulated to the fcrmcnter.
Said mixture can also be separated by at ]east one centrifugal separator provided with a rotor, journalled horizon-tally in bearings and a conveying screw, arranged coaxially within the rotor for discharge of separated heavy phase into one solid substance fraction, which forms heavy phase, and into one liquid fraction, enriched in substrate, which is recirculated to the fermenter.
Vacuum sieves can also be used for the separation into solid phase fraction and substrate-enriched liquid fraction.
It is especially advantageous to bring said flow, rich in solid substance, into contact with at least part of the re-sidual flow by providing several separation means in series, the flow, rich in solid substance and at least part of the residual flow being brought to move countercurrently.
Such countercurrent washing of substrate from the flow, rich in solid substance, can also be performed in different types of extractors, for instance in the form of columns, provided ; with so called extraction trays.
In one especially suitable embodiment of the method according to the invention the yeast-free flow is separated by a distillative method into one flow enriched in ethanol and one residual flow, so called slop, which is thus utilized for trans-ferring the substrate, that is adhering to the solid substance, to the fermenter.
Considering the efficiency of the transfer of the substrate, adhering to the solid substance to the fermenter, the concentration of the fermentable substance in the slop shall be much lower than that in the raw material flow fed.
The invention shall now be described more in detail, reference being made to the enclosed three figures, of which figure 1 shows, schematically, a flow sheet of a plant for the performance of the method according to the Swedish ~atent Application No. 7801133-5; figure 2 shows, schematically, a flow sheet of a plant for the performance of the method according to the present invention, three bow-sieves, coupled in series, and a centrifugal separator with horizontal rotor and a coaxial conveying screw for recovery of substrate from flow, rich i.n solid substance, being used.
Figure 3 shows a plant for the perfoxmance of the method according to the present invention, two centrifugal separators with horizontal rotor and a coaxial conveyor screw being used for 10 recovery of substrate from flow, rich in solid substance being used.
In all fi.gures 1 refers to one (or a plurality of) fermenter, 2 to a centrifugal separator for the recirculation of yeast to same and 3 to a plant for the separation of a yeast-free flow into a flow enriched in ethanol and one residual flow, exhausted from ethanol but containing a certain amount of ferment-: able viz. nonfermentable material. In the examples shown plant 3 is assumed to be a simple distillation plant, and the residual flow is in the following referred to as "slop".
From the distillation plant 3 there is discharged an enriched ethanol flow through a pipe 4 and a slop flow through a pipe 5. A flow of fermentation liquor is taken through a pipe 6 to centrifugal separator 2, while a separated yeast flow is recirculated via a pipe 7 to the fermenter and a yeast-free flow containing ethanol is fed via a pipe 8 to distillation plant 3.
In all three plants shown a raw material flow is fed through a pipe 9.
The plant disclosed in figure 1 comprises a centrifugal separator 10, by the aid of which the raw material flow fed is rid 30 of any fibres and other solid matter, which are discharged through a pipe 11, whiie the substrate flow is fed to the fermenter through a pipe 12. At least part of the slop from distillation J
plant 3 is recirculated to the fermenter throuqh a pipe 13, while a certain amount of the slop is discharged from the plant through a pipe 14.
In the embodiment of a plant for the performance of the method according to the inventlon disclosed in figure 2, part of the slop is discharged through a pipe 15. The remaining part of the slop flow is fed, via a pipe 16, to a unit for efficient separation of the incoming raw material flow into one solid-substance flow, substantially free from substrate, and one sub-strate flow. This unit consists of three bow sieves 7, 18 and 19, three mixing tanks 20, 21 and 22 with pumps 23, 24 and 25 connected thereto. This is also a centrifugal separator 26 in the unit.
The former is of a type, comprising a rotor, horizontally jour-nalled in bearinas with a conveyor screw provided coaxially with-in the rotor for discharge of separated heavy phase.
The centrifugal separator and the bow sieves are coupled in series, and the raw material flow, fed through pipe 9 streams countercurrently to the slop flow, fed throuah pipe 16.
The solid substance, which is washed out, is brought to a relatively high dry solids content in centrifugal separator 26 and leaves the plant for further treatment, like drying, through a pipe 27. The substrate flow, rid of fibres etc, is fed to the fermenter throuah a pipe 28. The line design is disclosed more in detail in the fiaure. It must be observed, that many different flow sheets are possible. The unit shown is considered to be efficient and economical in operation.
The embodiment of said unit, which is shown in figure 3, consists, as mentioned above, of two centrifugal separators 29, 30 of the same type as that with reference number 26 i~ figure 2, and of two tanks 31,32 provided with stirrers, not shown, the centrifugal separators and the tanks being coupled in series, as - is obvious from the figure. A raw material flow is fed to tank i.`
31 via pipe 9. Also a liquid flow coming from centrifugal separator 30 is fed to this tank through a pi.pe 33. A slop flow is fed, via a pipe 34 to tan]c 32, and relatively dry substance, rid of substrate, is discharged from the unit through a pipe 35.
Ethanoi can be manufactured from several types of raw r~lztcrials of vegetable origin. ~nese ~aw materials all contain, or are brought -to contain some fe~-mentable carbohydrate, dissolved in water to a more or less high cGncentration.
~epending on the processes, which the raw materia]s hizve been subject to, in order to reach at least a certain content of fe~qentable carbchydra'es, such as en%ymatic or acid hydro]ysis of starch or li~line-containing cellulose rzw materials, the substrate, which shall be fe~mented into e-thc-Lnol, is more or less miY.ed with nonfeImentable solid r~atter l-ke cellulose fibres, hulls, lignine etc.
~nen conceiving fermentation processes for the prGduction of e-hanol it is ai~edat mi~ ni~ing the ener~y demænd ~ld the ~ater cons~Jnptio3l, and increasing thesu~r yield zs far ~s possible.
: "locess, ;:hich meets Ihese demand, as far as 'he raw ~~lerial is not too L-Juch conte~inated by fib~es, hulls, etc. s clescribed in the S:~e~ish pztent applica-t-on No. 78011~-5, which is con^erned with a T~ethcd for t e plGC'a~CtiOn of a ~olatile c-~a~ic co--ipGund, in p-rt~c-il^- etha!Gl, by COI-~tin'~CUS fe'-..ell~a'tiCn 9~,6 of 2 c~ o!~ o!l v': i 11 i.l ~ ' ll v.i ~. `: ' ;- ; 1. ~ I ~' f lll~.~ll t ? , ~.n~ ;.n ~ c}. ~ cte-r~ g f~a'~ re is~ t}lat a flow of ïe-~ t ticn ~ 0r is separated, by ccntr~-fllg~ e~iLration~ into at ]east one y.oss~ OO:.o?r1-urate flow a~d one yeast-free flow, oi which the ye~ t concentrate fl.ow is :recirculated to the fermenter, while the yea.st-free flow is separated into one f~.ow, enriched in vola-tlle organic compound, which is dischargred, a~d a res1dllal flow, of ~hich at ieast part .s recircu1.ated to the fe77nenter.
If the raw material contains fibres, these rnus~t be removed before the raw ma-terial flow is fed to the felmenter, in such a rprocec6. Othe-~lise it woll]d be.,npossible to perferolD the reci.-rculation of yeast ~ithout a si~ult~neous re-eirculation of said solid IDatter. For this re~ison, the raw rnateIia.l flow fed is usually separated into one substrate flow, which is fed to the fe~menter, and one flow, rieh in solid substance, by centrifl~f~l separation, said last flow bein~ washed with water, which after washing is enriched with substrate, adheri.ng to the solid substanee, and is fed to the fe~qenter. It is t~ue that such a mode of operation would make possible the perfoImance of the rnethod according to the Swedish Patent App].ication No. 7801133-5, but it would mean an increased, nondesirable cons~qption of l13ter end energy.
It is the object of the present inventior, to create a lqethod of the type mentioned by way of introduction, in wl1ich the energy demand and the water con--sumption is minimi~ed, while the sugar yield is as high as possible.
According to the present invention this -,roblem is solved by brlnging the flow,rich in solid substance, into contact wivh at least part of the residual flow, the mi~ture thus obtained being separc~t.^-d rartly into a flow of solid substance, from which remaining substrate has sub t.~ltially been rernoved, and p~rtly intoone flow, em~iched in substrate, ~;hi.ch f1Gw is recirculated to the fe~menter.
In one suitable e!nbodiment of the me~hcd according to the invention, s?id mix-ture is se-parated by at least one ser)2rc~t`on ~le3~s in the foL~ of a sieve meens, a flow rich in solid rr!attc-r being fec' to said sieve mec^~s togethe~ ith at lea.st part of said residual flow and se~.arcated pLr~ly into one .solid ;r,nasefr2ction, which is preve-rlted in a Wây 'r-!~r.;lll ?'r se to pacs the sieve -~ec-ns ithout foI~ing a filtering la~er on s~r~ -nd partly into one liquid frc-ct~on, er~iched in substrate, ~hich frectic-i is '-ou~ht to pcass sa~id s-e;es ~.ci~s, end is rc-cireulated to the fcrmcnter.
Said mixture can also be separated by at ]east one centrifugal separator provided with a rotor, journalled horizon-tally in bearings and a conveying screw, arranged coaxially within the rotor for discharge of separated heavy phase into one solid substance fraction, which forms heavy phase, and into one liquid fraction, enriched in substrate, which is recirculated to the fermenter.
Vacuum sieves can also be used for the separation into solid phase fraction and substrate-enriched liquid fraction.
It is especially advantageous to bring said flow, rich in solid substance, into contact with at least part of the re-sidual flow by providing several separation means in series, the flow, rich in solid substance and at least part of the residual flow being brought to move countercurrently.
Such countercurrent washing of substrate from the flow, rich in solid substance, can also be performed in different types of extractors, for instance in the form of columns, provided ; with so called extraction trays.
In one especially suitable embodiment of the method according to the invention the yeast-free flow is separated by a distillative method into one flow enriched in ethanol and one residual flow, so called slop, which is thus utilized for trans-ferring the substrate, that is adhering to the solid substance, to the fermenter.
Considering the efficiency of the transfer of the substrate, adhering to the solid substance to the fermenter, the concentration of the fermentable substance in the slop shall be much lower than that in the raw material flow fed.
The invention shall now be described more in detail, reference being made to the enclosed three figures, of which figure 1 shows, schematically, a flow sheet of a plant for the performance of the method according to the Swedish ~atent Application No. 7801133-5; figure 2 shows, schematically, a flow sheet of a plant for the performance of the method according to the present invention, three bow-sieves, coupled in series, and a centrifugal separator with horizontal rotor and a coaxial conveying screw for recovery of substrate from flow, rich i.n solid substance, being used.
Figure 3 shows a plant for the perfoxmance of the method according to the present invention, two centrifugal separators with horizontal rotor and a coaxial conveyor screw being used for 10 recovery of substrate from flow, rich in solid substance being used.
In all fi.gures 1 refers to one (or a plurality of) fermenter, 2 to a centrifugal separator for the recirculation of yeast to same and 3 to a plant for the separation of a yeast-free flow into a flow enriched in ethanol and one residual flow, exhausted from ethanol but containing a certain amount of ferment-: able viz. nonfermentable material. In the examples shown plant 3 is assumed to be a simple distillation plant, and the residual flow is in the following referred to as "slop".
From the distillation plant 3 there is discharged an enriched ethanol flow through a pipe 4 and a slop flow through a pipe 5. A flow of fermentation liquor is taken through a pipe 6 to centrifugal separator 2, while a separated yeast flow is recirculated via a pipe 7 to the fermenter and a yeast-free flow containing ethanol is fed via a pipe 8 to distillation plant 3.
In all three plants shown a raw material flow is fed through a pipe 9.
The plant disclosed in figure 1 comprises a centrifugal separator 10, by the aid of which the raw material flow fed is rid 30 of any fibres and other solid matter, which are discharged through a pipe 11, whiie the substrate flow is fed to the fermenter through a pipe 12. At least part of the slop from distillation J
plant 3 is recirculated to the fermenter throuqh a pipe 13, while a certain amount of the slop is discharged from the plant through a pipe 14.
In the embodiment of a plant for the performance of the method according to the inventlon disclosed in figure 2, part of the slop is discharged through a pipe 15. The remaining part of the slop flow is fed, via a pipe 16, to a unit for efficient separation of the incoming raw material flow into one solid-substance flow, substantially free from substrate, and one sub-strate flow. This unit consists of three bow sieves 7, 18 and 19, three mixing tanks 20, 21 and 22 with pumps 23, 24 and 25 connected thereto. This is also a centrifugal separator 26 in the unit.
The former is of a type, comprising a rotor, horizontally jour-nalled in bearinas with a conveyor screw provided coaxially with-in the rotor for discharge of separated heavy phase.
The centrifugal separator and the bow sieves are coupled in series, and the raw material flow, fed through pipe 9 streams countercurrently to the slop flow, fed throuah pipe 16.
The solid substance, which is washed out, is brought to a relatively high dry solids content in centrifugal separator 26 and leaves the plant for further treatment, like drying, through a pipe 27. The substrate flow, rid of fibres etc, is fed to the fermenter throuah a pipe 28. The line design is disclosed more in detail in the fiaure. It must be observed, that many different flow sheets are possible. The unit shown is considered to be efficient and economical in operation.
The embodiment of said unit, which is shown in figure 3, consists, as mentioned above, of two centrifugal separators 29, 30 of the same type as that with reference number 26 i~ figure 2, and of two tanks 31,32 provided with stirrers, not shown, the centrifugal separators and the tanks being coupled in series, as - is obvious from the figure. A raw material flow is fed to tank i.`
31 via pipe 9. Also a liquid flow coming from centrifugal separator 30 is fed to this tank through a pi.pe 33. A slop flow is fed, via a pipe 34 to tan]c 32, and relatively dry substance, rid of substrate, is discharged from the unit through a pipe 35.
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for the production of ethanol, from a raw material flow, consisting of a carbohydrate-containing substrate, mixed with cellulose-containing fibres and/or other nonfermentable, solid material, said raw material flow being separated into one flow rich in solid substance and one substrate flow, free from solid substance, which last flow is fermented in one or several fermenters, a flow of fermentation liquor being separated by centrifugal separation, into at least one yeast concentrate flow and one yeast-free flow, of which the yeast concentrate flow is recirculated to the fermenter, while the yeast-free flow is separated into one flow, enriched in ethanol, and one residual flow, of which at least part is recirculated to the fermenter, characterized in that the flow, rich in solid substance is brought into contact with at least part of the residual flow, the mixture thus obtained being separated partly into a flow of solid substance, from which remaining substrate has substantially been removed, and partly into one flow, enriched in substrate, which flow is recirculated to the fermenter.
2. A method according to claim 1, characterized in that said mixture is separated by at least one separation means in the form of a sieve means, a flow rich in solid matter being fed to said sieve means together with at least part of said residual flow and separated partly into one solid phase fraction, which is prevented in a way known per se to pass the sieve means without forming a filtering layer on same, and partly into one liquid fraction, enriched in substrate, which fraction is brought to pass said sieves means, and is recirculated to the fermenter.
3. A method according to claim 1, characterized in that said mixture is separated by at least one centrifugal separator provided with a rotor, journalled horizontally in bearings and a conveying screw, arranged coaxially within the rotor for discharge of separated heavy phase into one solid substance fraction, which forms heavy phase, and into one liquid fraction, enriched in sub-strate, which is recirculated to the fermenter.
4. A method according to claim 1, characterized in that said mixture is separated by at least one separation means in the form of a sieve means, on one side of which there prevails a subpressure, the solid substance fraction being collected on one side of the sieves means, while liquid fraction, enriched in substrate, is brought to pass the sieve means.
5. A method according to claim 2 or 3, characterized in that the flow, rich in solid substance is brought into contact with at least part of the residual flow by providing several se-paration means in series, the flow, rich in solid substance, and at least part of the residual flow being brought to move countercurrently.
6. A method according to claim 2 or 3, characterized in that the yeast-free flow is separated by a distillative method into one flow enriched in ethanol, and into one residual flow, so-called slop.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7811826A SE416315B (en) | 1978-11-16 | 1978-11-16 | METHOD FOR MANUFACTURE OF ETHANOL, WHEREAS THE CURRENT FLOW IS DIVIDED INTO A FLOW RICH OF SOLID SUBSTANCE AND A SUBSTRATE FLOW FREE OF SOLID SUBSTANCE, WHEN THE LAST FLOW AFTER PROCESSING IS PARTICULARLY BRINGED ... |
| SE7811826-2 | 1978-11-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1110986A true CA1110986A (en) | 1981-10-20 |
Family
ID=20336375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA340,061A Expired CA1110986A (en) | 1978-11-16 | 1979-11-16 | Production of ethanol |
Country Status (5)
| Country | Link |
|---|---|
| AU (1) | AU530771B2 (en) |
| CA (1) | CA1110986A (en) |
| DE (1) | DE2946161A1 (en) |
| FR (1) | FR2441661A1 (en) |
| SE (1) | SE416315B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE430699B (en) * | 1981-11-06 | 1983-12-05 | Alfa Laval Ab | PROCEDURE FOR PREPARING ETHANOL BY CONTINUOUS SPRAYING OF A CARBOHYDRATE-SUBSTRATE, WHEREAS THE FERMENTOR IS ADDED TO A RAVARA WHICH EXCEPT JESBARA CARBOHYDRATES, INCLUDES NOT JESBIAL |
| IT1211714B (en) * | 1987-08-12 | 1989-11-03 | Technipetrol Spa | PROCEDURE, APPARATUS AND RELATED OPERATING METHOD FOR THE PRODUCTION OF ETHANOL FROM CEREALS WITH CONTINUOUS PROCESS |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE430171B (en) * | 1978-01-31 | 1983-10-24 | Alfa Laval Ab | CONTINUOUS PROCEDURE FOR THE PRODUCTION OF ETHANOL IN A FERMENTOR ADDED TO A SUBSTRATE WITH HIGH CARBOHYDRATE CONCENTRATION, WHICH DISPOSES FERMENTATION LIQUID AFTER COMPOUNDING A FRENCH PREPARED FLUID ... |
-
1978
- 1978-11-16 SE SE7811826A patent/SE416315B/en not_active IP Right Cessation
-
1979
- 1979-11-15 DE DE19792946161 patent/DE2946161A1/en not_active Withdrawn
- 1979-11-15 AU AU52848/79A patent/AU530771B2/en not_active Ceased
- 1979-11-16 CA CA340,061A patent/CA1110986A/en not_active Expired
- 1979-11-16 FR FR7928377A patent/FR2441661A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| FR2441661A1 (en) | 1980-06-13 |
| DE2946161A1 (en) | 1980-06-04 |
| FR2441661B1 (en) | 1984-03-23 |
| SE7811826L (en) | 1980-05-17 |
| SE416315B (en) | 1980-12-15 |
| AU5284879A (en) | 1980-05-22 |
| AU530771B2 (en) | 1983-07-28 |
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