CN106929546A - The method that rice straw produces cellulosic ethanol - Google Patents
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- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
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Abstract
A kind of method that rice straw produces cellulosic ethanol.Original production method feedstock silicate content is high will to be caused to distill stifled tower.The method comprises the following steps：（1）190 DEG C of temperature again after briquetting stalk cleaning dust, carry out thermal and hydric environment treatment under pressure 1.3MPa, in alkalescent, temperature is stir process in 50~55 DEG C of blender to material；（2）Two-stage enzyme hydrolysis is carried out under the environment of pH value 5~5.2, the time is 100h；（3）Input corn mash liquid simultaneously access yeast, it is secondary spread cultivation after fermented, 35 DEG C of fermentation temperature, fermentation time 7 days；（4）Yeast cells in fermentation liquid and less lignin molecule are separated；（5）Cellulosic ethanol is obtained using double thick tower differential distillations and adsorption tower combined treatment.The method that the present invention produces cellulosic ethanol for rice straw.
Description
Technical field：
The present invention relates to a kind of method that rice straw produces cellulosic ethanol.
Background technology：
According to northern China Rice Cropping actual conditions, after paddy rice is gathered in through harvester, stalk dries to moisture naturally in field<
After 20% through the harvesting packing of straw baler tool, being transported in the big storehouse of plantation concentration zones periphery construction carries out preparatory processing, big
Straw carries out Alcohol Production by delivering to factory after dedusting, removal of impurities in storehouse, and the big storehouse of multiple built in circumference 50km radiuses ensures
The annual raw materials requirement of Alcohol Plant, has simply carried out simple dedusting, removal of impurities work, China paddy rice straw in raw material crushing process
Stalk aboundresources, annual production produces alcohol fuel up to more than 300,000,000 tons using rice straw, to solving energy problem of following China, reality
Now section grain has huge potentiality and wide application prospect for grain and environmental protection, and the main component of rice straw is cellulose, right
The topmost restrictive factor of utilization of cellulose be convert cellulose into can fermentation reducing sugar.
The content of the invention：
It is an object of the invention to provide a kind of method that rice straw produces cellulosic ethanol, using brand-new manufacture craft, fill
Divide using discarded stalk, increased new energy kind.
Above-mentioned purpose is realized by following technical scheme：
A kind of method that rice straw produces cellulosic ethanol, the method comprises the following steps：（1）After briquetting stalk cleaning dust
190 DEG C of temperature, carry out thermal and hydric environment treatment again under pressure 1.3MPa, and in alkalescent, temperature is 50~55 DEG C of blender to material
Middle stir process；（2）Two-stage enzyme hydrolysis is carried out under the environment of pH value 5~5.2, the time is 100h；（3）Input corn mash liquid
And access yeast, it is secondary spread cultivation after fermented, 35 DEG C of fermentation temperature, fermentation time 7 days；（4）It is thin to yeast in fermentation liquid
Born of the same parents and less lignin molecule are separated；（5）Cellulose is obtained using double thick tower differential distillations and adsorption tower combined treatment
Ethanol.
The method that described rice straw produces cellulosic ethanol, the detailed process of described briquetting stalk pretreatment is：
Briquetting stalk delivers to Alcohol Plant after short-distance transport and carries out cleaning dust, cleaning dust to waterpower grass washing machine by tape transport
After be transported to plug flow thermal and hydric environment treatment workshop section advanced treating is carried out to rice straw, be passed through live (open) steam pressurized, heated, plus
Pressure 1.3MPa is depressed into, after being heated to 190 DEG C of temperature, process time 20 minutes, plug flow reactor reaction mass is by two-stage
Flash distillation discharging to blender, primary flash steam reuse, two-stage flash steam is mixing by condensation heel row to sewage treatment plant
Softened water is added in agitator, 50~55 DEG C of temperature is adjusted, NaOH and ammoniacal liquor regulation pH5~5.5 are added, enzyme is added with water
Mixture, is stirred mixing, after 3 hours of stir process, is delivered in enzyme hydrolysis tank.
The method that described rice straw produces cellulosic ethanol, described enzyme hydrolysis detailed process is：Blender is conveyed
Material needs, in 50~55 DEG C of keeping temperature in enzyme hydrolysis tank, to increase stirring dynamics, continues enzyme hydrolysis, hydrolyzes 50 hours, enzyme
Need to be continuously added PH to 5~5.2 in liquid caustic soda regulation pipe in solution preocess, after one-level enzyme hydrolysis tank enzymolysis 50h by material pumping extremely
Two grades of enzyme hydrolysis tanks continue to digest, and keep constant persistently 50h, the completion hydrolysis again of condition, and two-stage heat exchanger is used after the completion of enzymolysis
Enzyme hydrolysis material is down to 35 DEG C by 55 DEG C and delivers to fermentation workshop section.
The method that described rice straw produces cellulosic ethanol, described fermentation detailed process is：First in one-level ferment
Corn mash liquid is put into female tank and the yeast that strain laboratory spreads cultivation is accessed, squeezing into secondary yeast tank after culture is good carries out two
Secondary to spread cultivation, the secondary culture medium for using that spreads cultivation is stalk enzyme hydrolysis liquid glucose, and yeast is squeezed into enter in corresponding fermentation tank after spreading cultivation
Row fermentation, 35 DEG C of fermentation temperature, fermentation time 7 days.
The method that described rice straw produces cellulosic ethanol, described Yeast protein separates detailed process and is：Fermentation
Later stage yeast is deposited in fermentation tank tank bottom, using horizontal screw machine with by the way of disc separator is combined to fermentation liquid in yeast it is thin
Born of the same parents and less lignin molecule are separated, and horizontal screw machine centrifugation dry matter content about 30%, disc separator separates dry matter content about 10%,
Clear liquid after centrifugation returns to fermentation tank, and concentrate is sent to yeast dryer, and dusty yeast take-away, fermentation are obtained after drying
After excluding fermentation liquid in tank, purging system circulation is carried out, and start the fermentation cycle of a new round.
The method that described rice straw produces cellulosic ethanol, described distillation processes detailed process and is：Using current
Advanced double thick tower differential distillations are combined with adsorption tower, and thick tower, combined column, smart tower order differential pressure, only smart tower enter initial steam, wine
Vital essence mutually enters molecular sieve, and operation temperature is 103-108 DEG C of thick tower, 0.06-0.15Mpa of tower top pressure, and combined column temperature 85-
95 DEG C, tower top pressure-0.05-- 0.08Mpa, smart 120-128 DEG C of tower temperature degree, 0.06-0.15Mpa of tower top pressure, distillation is carried
Cellulosic ethanol is obtained after pure treatment.
The carbon dioxide of the method by-product of described rice straw production cellulosic ethanol, the dioxy collected in fermentation process
Change carbon first passes around potassium washes tower carries out primary wash, removes the impurity such as organic matter, enters back into water scrubber removing alcohols etc. soluble
Impurity, the carbon dioxide through gas-liquid separator separates enters one section of compressor by air bag, and 2.0MPa is pressurized to through compressor,
Residual moisture is sloughed into molecular sieve after supercharging, carbon dioxide is reached below -45 DEG C of dew-point temperature, dried dioxy
Change carbon and do purified treatment into adsorption tower, remove moisture removal, impurity and peculiar smell, the cold of refrigerator is entered after gas is pre-cooled after absorption
Condenser is condensed to less than -20 DEG C, as liquid CO 2, qualified liquid CO 2 feeding carbon dioxide storage tank.
Beneficial effect：
1. the present invention increased dedusting, dedoping step in raw material crushing process, and briquetting raw material increased waterpower washing after entering factory
Device, recycle-water uses flocculating setting mode removing unit divided silicic acid salt after washing.
Cellulosic ethanol distilling apparatus of the invention is distilled to distilling using double thick tower differential distillation modes to material
Operation, cryogenic distillation process avoids the stifled tower of rice straw thermal structure.
The present invention used desalting processing before anaerobic effluent enters membrane filtration, and sewage enters at two-stage membrane filtration after desalination
Production meets the recycle-water of technological requirement after reason, it is ensured that the clearance of silicate, and then ensures the stable operation of film filter.
The present invention is reclaimed to the carbon dioxide produced in fermentation process, is sent in carbon dioxide storage tank and is easy to
Utilize, reduce air pollution, increase economic benefit.
190 DEG C of temperature again after briquetting stalk cleaning dust of the invention, carry out thermal and hydric environment treatment, thing under pressure 1.3MPa
In alkalescent, temperature is stir process in 50~55 DEG C of blender to material；By the present invention in that processed with thermal and hydric environment, greatly
The yield of raw material stalk is improve, the generation of harmful toxic matter is reduced.
The present invention carries out two-stage enzyme hydrolysis under the environment of pH value 5~5.2, and the time is 100h, realizes being fully hydrolyzed, percent hydrolysis
Reach, just stage enzymatic hydrolysis realize can pump conveying, enzyme hydrolysis again realizes complete hydrolysis.
Present invention input corn mash liquid and the yeast that spreads cultivation of insert experiment room, it is secondary spread cultivation after fermented, ferment
35 DEG C of temperature, was fermented by 7 days, and fermentation is abundant, increases economic efficiency.
The present invention using horizontal screw machine with by the way of disc separator is combined to fermentation liquid in yeast cells and less
Lignin molecule is separated, and the yeast cells in zymotic fluid is kept completely separate, and is sold as protein feed.
Discharged to blender by double flash evaporation in present invention process, softened water, regulation temperature are added in mixing agitator
50~55 DEG C of degree, adds NaOH and ammoniacal liquor regulation pH5~5.5, adds the mixture of enzyme and water, is stirred mixing, stirs
After 3 hours for the treatment of, it is delivered in enzyme hydrolysis tank, reaches the effect of recovered steam.
Brief description of the drawings：
Accompanying drawing 1 is process chart of the invention.
Specific embodiment：
Embodiment 1：
A kind of method that rice straw produces cellulosic ethanol, the method comprises the following steps：（1）After briquetting stalk cleaning dust
190 DEG C of temperature, carry out thermal and hydric environment treatment again under pressure 1.3MPa, and in alkalescent, temperature is 50~55 DEG C of blender to material
Middle stir process；（2）Two-stage enzyme hydrolysis is carried out under the environment of pH value 5~5.2, the time is 100h；（3）Input corn mash liquid
And access yeast, it is secondary spread cultivation after fermented, 35 DEG C of fermentation temperature, fermentation time 7 days；（4）It is thin to yeast in fermentation liquid
Born of the same parents and less lignin molecule are separated；（5）Cellulose is obtained using double thick tower differential distillations and adsorption tower combined treatment
Ethanol.
Embodiment 2：
The method that rice straw according to embodiment 1 produces cellulosic ethanol, described briquetting stalk pretreatment it is specific
Process is：Briquetting stalk delivers to Alcohol Plant after short-distance transport and carries out cleaning dust to waterpower grass washing machine by tape transport,
Plug flow thermal and hydric environment treatment workshop section is transported to after cleaning dust carries out advanced treating to rice straw, is passed through live (open) steam pressurization
Heating, is forced into pressure 1.3MPa, after being heated to 190 DEG C of temperature, process time 20 minutes, plug flow reactor reaction mass warp
Cross double flash evaporation to discharge to blender, primary flash steam reuse, two-stage flash steam passes through condensation heel row to sewage treatment plant,
Softened water is added in mixing agitator, 50~55 DEG C of temperature is adjusted, NaOH and ammoniacal liquor regulation pH5~5.5 are added, enzyme is added
With the mixture of water, mixing is stirred, after 3 hours of stir process, be delivered in enzyme hydrolysis tank.
Embodiment 3：
The method that rice straw according to embodiment 1 or 2 produces cellulosic ethanol, described enzyme hydrolysis detailed process is,
Blender conveying material needs, in 50~55 DEG C of keeping temperature in enzyme hydrolysis tank, to increase stirring dynamics, continues enzyme hydrolysis, hydrolysis
50 hours, need to be continuously added PH to 5~5.2 in liquid caustic soda regulation pipe in enzymolysis process, by thing after one-level enzyme hydrolysis tank enzymolysis 50h
Material is pumped to two grades of enzyme hydrolysis tanks to be continued to digest, and holding condition is constant to continue 50h again, completes hydrolysis, and two are used after the completion of enzymolysis
Enzyme hydrolysis material is down to 35 DEG C and delivers to fermentation workshop section by level heat exchanger by 55 DEG C.
Embodiment 4：
The method that rice straw according to embodiment 1 or 2 or 3 produces cellulosic ethanol, described fermentation detailed process is：
Corn mash liquid is put into first in one-level yeast tank and the yeast that strain laboratory spreads cultivation is accessed, two grades are squeezed into after culture is good
Yeast tank carry out it is secondary spread cultivation, the secondary culture medium for using that spreads cultivation is stalk enzyme hydrolysis liquid glucose, spread cultivation after yeast squeeze into accordingly
Fermentation tank in fermented, 35 DEG C of fermentation temperature, fermentation time 7 days.
Embodiment 5：
The method that rice straw according to embodiment 1 or 2 or 3 or 4 produces cellulosic ethanol, described Yeast protein is separated
Detailed process is：Fermentation later stage yeast is deposited in fermentation tank tank bottom, using horizontal screw machine by the way of disc separator is combined pair
Yeast cells and less lignin molecule are separated in fermentation liquid, horizontal screw machine centrifugation dry matter content about 30%, disc separator point
From dry matter content about 10%, the clear liquid after centrifugation returns to fermentation tank, and concentrate is sent to yeast dryer, obtains after drying
Dusty yeast is taken out, and after excluding fermentation liquid in fermentation tank, carries out purging system circulation, and start the fermentation cycle of a new round.
Embodiment 6：
The method that rice straw according to embodiment 1 or 2 or 3 or 4 or 5 produces cellulosic ethanol, described distillation treatment
Detailed process is：Combined with adsorption tower using currently advanced double thick tower differential distillation, thick tower, combined column, smart tower order differential pressure,
Only smart tower enters initial steam, and alcohol gas phase enters molecular sieve, operation temperature be 103-108 DEG C of thick tower, tower top pressure 0.06-
0.15Mpa, 85-95 DEG C of combined column temperature, tower top pressure-0.05-- 0.08Mpa, smart 120-128 DEG C of tower temperature degree, tower top pressure
0.06-0.15Mpa of power, cellulosic ethanol is obtained after distilation treatment.
Embodiment 7：
The carbon dioxide of the method by-product of a kind of one of claim 1-6 described rice straw production cellulosic ethanol, fermentation
During the carbon dioxide collected first pass around potassium and wash tower and carry out primary wash, remove the impurity such as organic matter, enter back into water scrubber
The soluble impurity such as alcohols are removed, the carbon dioxide through gas-liquid separator separates enters one section of compressor by air bag, through pressure
Contracting machine is pressurized to 2.0MPa, and residual moisture is sloughed into molecular sieve after supercharging, carbon dioxide is reached -45 DEG C of dew-point temperature
Hereinafter, dried carbon dioxide does purified treatment into adsorption tower, removes moisture removal, impurity and peculiar smell, and gas is through pre- after absorption
Condenser after cold into refrigerator is condensed to less than -20 DEG C, as liquid CO 2, qualified liquid CO 2 feeding
Carbon dioxide storage tank.
Claims (7)
1. a kind of method that rice straw produces cellulosic ethanol, it is characterized in that：The method comprises the following steps：（1）Briquetting straw
In 190 DEG C of temperature after stalk cleaning dust, thermal and hydric environment treatment is carried out under pressure 1.3MPa, material in alkalescent, temperature is 50~
Stir process in 55 DEG C of blender；（2）Two-stage enzyme hydrolysis is carried out under the environment of pH value 5~5.2, the time is 100h；（3）Input
Corn mash liquid simultaneously accesses yeast, it is secondary spread cultivation after fermented, 35 DEG C of fermentation temperature, fermentation time 7 days；（4）To fermentation
Yeast cells and less lignin molecule are separated in mash；（5）Using double thick tower differential distillations place is combined with adsorption tower
Reason obtains cellulosic ethanol.
2. the method that rice straw according to claim 1 produces cellulosic ethanol, it is characterized in that：Described briquetting stalk
The detailed process of pretreatment is：Briquetting stalk is delivered to Alcohol Plant after short-distance transport and is entered to waterpower grass washing machine by tape transport
Row cleaning dust, plug flow thermal and hydric environment treatment workshop section is transported to after cleaning dust carries out advanced treating to rice straw, is passed through
Live (open) steam pressurized, heated, is forced into pressure 1.3MPa, after being heated to 190 DEG C of temperature, process time 20 minutes, plug flow reaction
Device reaction mass discharges to blender by double flash evaporation, and primary flash steam reuse, two-stage flash steam passes through condensation heel row
To sewage treatment plant, softened water is added in mixing agitator, adjust 50~55 DEG C of temperature, add NaOH and ammoniacal liquor regulation pH5
~5.5, the mixture of enzyme and water is added, mixing is stirred, after 3 hours of stir process, it is delivered in enzyme hydrolysis tank.
3. the method that rice straw according to claim 1 and 2 produces cellulosic ethanol, it is characterized in that：Described enzyme water
Solving detailed process is：Blender conveying material needs, in 50~55 DEG C of keeping temperature in enzyme hydrolysis tank, to increase stirring dynamics, after
Continuous enzyme hydrolysis, hydrolyzes 50 hours, needs to be continuously added PH to 5~5.2 in liquid caustic soda regulation pipe, one-level enzyme hydrolysis tank in enzymolysis process
Material pumping to two grades of enzyme hydrolysis tanks is continued to digest after enzymolysis 50h, holding condition is constant to continue 50h again, completes hydrolysis, enzymolysis
After the completion of using two-stage heat exchanger by enzyme hydrolysis material by 55 DEG C be down to 35 DEG C deliver to fermentation workshop section.
4. the method that the rice straw according to claim 1 or 2 or 3 produces cellulosic ethanol, it is characterized in that：Described hair
Ferment detailed process is：Corn mash liquid is put into first in one-level yeast tank and the yeast that strain laboratory spreads cultivation is accessed, trained
Support it is good after squeeze into secondary yeast tank carry out it is secondary spread cultivation, the secondary culture medium for using that spreads cultivation spreads cultivation for stalk enzyme hydrolysis liquid glucose
Yeast is squeezed into and fermented in corresponding fermentation tank afterwards, 35 DEG C of fermentation temperature, fermentation time 7 days.
5. the method that the rice straw according to claim 1 or 2 or 3 or 4 produces cellulosic ethanol, it is characterized in that：It is described
Yeast protein separate detailed process be：Fermentation later stage yeast is deposited in fermentation tank tank bottom, using horizontal screw machine and disc separator
The mode being combined is separated to yeast cells in fermentation liquid and less lignin molecule, and horizontal screw machine centrifugation dry matter content is about
30%, disc separator separates dry matter content about 10%, and the clear liquid after centrifugation returns to fermentation tank, and concentrate is sent to yeast drying
Machine, obtains dusty yeast take-away after drying, after excluding fermentation liquid in fermentation tank, carries out purging system circulation, and start new
The fermentation cycle of one wheel.
6. the method that the rice straw according to claim 1 or 2 or 3 or 4 or 5 produces cellulosic ethanol, it is characterized in that：Institute
The distillation stated processes detailed process：Combined with adsorption tower using currently advanced double thick tower differential distillations, thick tower, combined column,
Smart tower order differential pressure, only smart tower enters initial steam, and alcohol gas phase enters molecular sieve, and operation temperature is 103-108 DEG C of thick tower, tower top
0.06-0.15Mpa of pressure, 85-95 DEG C of combined column temperature, tower top pressure-0.05-- 0.08Mpa, smart tower temperature degree 120-128
DEG C, 0.06-0.15Mpa of tower top pressure obtains cellulosic ethanol after distilation treatment.
7. a kind of one of claim 1-6 described rice straw produces the carbon dioxide of the method by-product of cellulosic ethanol, its
It is characterized in：The carbon dioxide collected in fermentation process first passes around potassium washes tower carries out primary wash, removes the impurity such as organic matter, then
The soluble impurity such as alcohols are removed into water scrubber, the carbon dioxide through gas-liquid separator separates enters compressor by air bag
One section, 2.0MPa is pressurized to through compressor, residual moisture is sloughed into molecular sieve after supercharging, carbon dioxide is reached dew point
Below -45 DEG C of temperature, dried carbon dioxide does purified treatment into adsorption tower, moisture removal, impurity and peculiar smell is removed, after absorption
Condenser after gas is pre-cooled into refrigerator is condensed to less than -20 DEG C, as liquid CO 2, qualified liquid dioxy
Change carbon feeding carbon dioxide storage tank.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108048507A (en) * | 2017-12-29 | 2018-05-18 | 中溶科技股份有限公司 | A kind of method using agricultural crop straw industrialization production ethyl alcohol |
| CN108101645A (en) * | 2017-12-29 | 2018-06-01 | 中溶科技股份有限公司 | A kind of method using biogas residue production bio-feritlizer |
| CN108094710A (en) * | 2017-12-11 | 2018-06-01 | 广西中粮生物质能源有限公司 | A kind of method of the full vinasse production of LIPIDS OF DRY RICE EMBRYO |
| CN109234323A (en) * | 2018-10-11 | 2019-01-18 | 内蒙古蒙苒生物科技有限公司 | A kind of method that fiber prepares ethyl alcohol |
| CN109320401A (en) * | 2018-10-31 | 2019-02-12 | 南京师范大学 | CO is coupled using gasifying stalk2The system and method for catalytic hydrogenation synthesizing alcohol |
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