CN105463032A - Pretreatment method for raw material cassava of fuel ethanol - Google Patents
Pretreatment method for raw material cassava of fuel ethanol Download PDFInfo
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- CN105463032A CN105463032A CN201510922996.6A CN201510922996A CN105463032A CN 105463032 A CN105463032 A CN 105463032A CN 201510922996 A CN201510922996 A CN 201510922996A CN 105463032 A CN105463032 A CN 105463032A
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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
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- 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
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Abstract
The invention belongs to the technical field of biomass energies and resources. For solving the problems that the existing impurity removal methods can not remove the epidermis and the roots of the rhizome of cassava, and the dust on the epidermis and the roots, and the impurities wear the devices and the pipelines, and reduce the activity of amylase and saccharomycetes, consequently, the yield of ethyl alcohol is reduced, the invention provides a pretreatment method for raw material cassava of fuel ethanol. The pretreatment method comprises the following steps: drying cassava at room temperature, washing cassava by adopting diluted hydrochloric acid, settling and filtering for removing the impurities, neutralizing by adopting sodium hydroxide till the neutral state is achieved, grinding and screening, drying and detecting. Since diluted hydrochloric acid can partially hydrolyze the epidermis and the small roots of the rhizome of cassava (the main components of the epidermis and the small roots of the rhizome of cassava are cellulose and pectin) and reduce the dust adhesion, the pretreatment by adopting diluted hydrochloric acid can effectively remove the dust, the small roots and the epidermis of cassava, reduce the wear of the devices and the pipelines, reduce the inhibition of infectious microbes for the fermentation process, and improve the yield of ethyl alcohol. Diluted hydrochloric acid is adopted as the cleaning solution, sodium hydroxide is adopted for neutralizing, and the waste water mainly contains sodium chloride and dust, so that no pollution is caused to the environment.
Description
Technical field
The invention belongs to biomass energy and resources technology field, be specifically related to the pretreatment process of a kind of fuel ethyl hydrate raw material cassava.
Background technology
Along with the development of world economy society, the crisis that energy shortage causes aggravates increasingly.Scientist estimates, can recover petroleum reserves only can for about 50 years of the mankind, Sweet natural gas also available 75 years, coal is then 200 ~ 300 years.Therefore, countries in the world are launched one after another to new forms of energy, particularly the research and development of regenerated biological energy.The main existence form of bioenergy has alcohol fuel, biofuel, biogas, hydrogen and fuel cell etc., wherein the most noticeable with the R & D and manufacture of alcohol fuel.The main raw material of alcohol fuel has grain (corn, Chinese sorghum, wheat etc.), non-grain crop (cassava, sugarcane, sweet sorghum stalk etc.) and lignocellulose etc.But grain security determines the principle that Fuel Alcohol Development should follow " do not strive grain with people, do not strive ground with grain ", and lignocellulose ethanol technology is not mature enough.Therefore, non-grain crop (cassava, sugarcane, sweet sorghum etc.) produces the support emphasis that alcohol fuel is national new forms of energy policy.Wherein, cassava to be grown a lot the raw material of potentiality for tool by universally acknowledged, one of non-grain crop raw material that Ye Shi China Fuel Alcohol Development is advocated.Due to alcohol fuel Commercial cultivation be the rhizome of cassava, after cleaning, still (be mainly containing a small amount of grit and earth and be present on tiny coring and epidermis, extremely difficult removal), in addition, the epidermis that the surface of the dry root of cassava has one deck brown and the coring for removing, earth, epidermis and coring are all with a large amount of miscellaneous bacterias, add the hazard rating of miscellaneous bacteria in fermenting process, reduce amylase and saccharomycetic activity, and then have influence on ethanol production, in addition, ash content and epidermis also wearing and tearing are caused to equipment and pipeline.
The pretreatment process of the foreign material such as traditional removal grit, coring and epidermis mainly applies water-washing technique, but on the rhizome epidermal surface being all attached to cassava due to ash content and tiny coring, the method for washing extremely difficult except deashing, tiny coring and epidermis.And remove silt particle, the impurity such as coring and epidermis on cassava surface, can not only farthest reduce miscellaneous bacteria source, reduce the fermenting process miscellaneous bacteria potential hazard to amylase and yeast activity, improve the productive rate of alcohol, also can reduce the wearing and tearing of above-mentioned impurity to equipment and pipeline.Therefore the pretreatment process developing effective cassava rhizome is very necessary.
Summary of the invention
The present invention is directed to traditional impurity-removing method and cannot remove the epidermis of cassava rhizome, coring and ash content attached thereto, the existence of these impurity not only causes equipment and pipeline weares and teares, also reduces amylase and saccharomycetic activity, and then reduce the problems such as ethanol production, provide the pretreatment process of a kind of fuel ethyl hydrate raw material cassava.
The present invention is realized by following technical scheme: the pretreatment process of a kind of fuel ethyl hydrate raw material cassava, is dried by cassava normal temperature, washes with dilute hydrochloric acid, sedimentation filtration removing impurity, then be neutralized to neutrality with sodium hydroxide, dry, grinding screening, detect, concrete steps are as follows:
(1) dry pre-removal of impurities: dried by cassava under normal temperature, diagrid removes packing bag, the rope made of hemp, larger grit impurity;
(2) dilute hydrochloric acid washing: cassava materials enters flush pot, adds that mass concentration is 0.01% ~ 0.08%, the dilute hydrochloric acid of 20 ~ 100L/kg cassava carries out flushing 2 ~ 24h, rinsing temperature is 50 ~ 90 DEG C;
(3) filter: after dilute hydrochloric acid rinses, cassava epidermis and tiny coring are destroyed, the ash content that sedimentation removing is rinsed and other impurity of epidermis, sedimentation adopts precipitation apparatus conventional in industry;
(4) neutralize: sedimentation is except to deash and after other impurity of epidermis, hydro-oxidation sodium is neutralized to neutrality;
(5) dry: the cassava after neutralization is dried;
(6) grinding screening: by except deashing, the cassava grinding of impurity, the Tapioca Starch screening after grinding, granularity is that 0.2 ~ 2mm is for subsequent use;
(7) analyze: sieve size is that the Tapioca Starch of 0.2 ~ 2mm is dried to constant weight, then Tapioca Starch sample determination skin slag and dirt content is got, measuring method adopts ASTME872-82, E1755-01 standard, detect skin slag and ash oontent and be used as ethanol fermentation lower than the Tapioca Starch of ASTME872-82, E1755-01 standard.
The present invention's dilute hydrochloric acid cleans cassava, because dilute hydrochloric acid can the epidermis of partial hydrolysis cassava rhizome and tiny coring, main component is Mierocrystalline cellulose and pectin, reduce its attachment to dirt, compared with traditional method, dilute hydrochloric acid pretreatment process more effectively can remove the ash content of cassava, tiny coring and epidermis, thus reduces the wearing and tearing of equipment and pipeline, reduce miscellaneous bacteria to the suppression of fermenting process, improve the productive rate of ethanol.Use dilute hydrochloric acid as scavenging solution, adopt sodium hydroxide neutralization, main containing a small amount of sodium-chlor and ash content in waste water, environmentally safe, belongs to green processes.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below by specific embodiment, the invention will be further described.Embodiment better understands the present invention to enable those skilled in the art to, but do not impose any restrictions the present invention.
A pretreatment process for fuel ethyl hydrate raw material cassava rhizome, dries cassava normal temperature, washes with dilute hydrochloric acid, and sedimentation filtration removing impurity, is then neutralized to neutrality with sodium hydroxide, grinding screening, and dry and detect, concrete steps are as follows:
(1) dry pre-removal of impurities: dried by cassava under normal temperature, diagrid removes packing bag, the rope made of hemp, larger grit impurity;
(2) dilute hydrochloric acid washing: cassava materials enters flush pot, adds that mass concentration is 0.01% ~ 0.08%, the dilute hydrochloric acid of 20 ~ 100L/kg cassava carries out flushing 2 ~ 24h, rinsing temperature is 50 ~ 90 DEG C;
(3) filter: after dilute hydrochloric acid rinses, cassava epidermis and tiny coring are destroyed, the ash content that sedimentation removing is rinsed and other impurity of epidermis, sedimentation adopts precipitation apparatus conventional in industry;
(4) neutralize: sedimentation is except to deash and after other impurity of epidermis, hydro-oxidation sodium is neutralized to neutrality;
(5) dry: the cassava rhizome after neutralization is dried;
(6) grinding screening: by except deashing, the cassava grinding of impurity, the Tapioca Starch screening after grinding, granularity is that 0.2 ~ 2mm is for subsequent use;
(7) analysis is dried: sieve size is that the Tapioca Starch of 0.2 ~ 2mm is dried to constant weight, then Tapioca Starch sample determination skin slag and dirt content is got, measuring method adopts ASTME872-82, E1755-01 standard, detect skin slag and ash oontent and be used as ethanol fermentation lower than the Tapioca Starch of ASTME872-82, E1755-01 standard.
Embodiment 1: under normal temperature, dries the cassava from Beihai Fisheries Base Guangxi Province, removes the impurity such as packing bag and the rope made of hemp through diagrid.Get a certain amount of sample and carry out skin slag and ash content test, measuring method adopts ASTM standard (ASTME872-82, E1755-01), measurement result: skin slag and ash oontent are 7.7%.After removal of impurities, cassava materials enters flush pot, add mass concentration be 0.05% dilute hydrochloric acid rinse, the dilute hydrochloric acid amount added is 70L/ (kg cassava).Flush time is 10h, and rinsing temperature is 70 DEG C.After dilute hydrochloric acid rinses, cassava epidermis and tiny coring are destroyed, the ash content that sedimentation removing is rinsed and other impurity of epidermis, and sedimentation adopts precipitation apparatus conventional in industry; Sedimentation is except to deash and after other impurity of epidermis, hydro-oxidation sodium is neutralized to neutrality; Then grind screening, granularity is that the Tapioca Starch of 0.8mm is dried to constant weight, and detection skin slag and ash oontent are 0.8%, and under same experimental conditions, skin slag and the ash oontent of the Tapioca Starch after rinsing with water are that more than 3.9%(concentration is mass concentration).Under the same terms, the pretreatment process applying the alcohol yied after pretreated cassava fermentation of the present invention more traditional improves 6.4%, improves the productive rate of ethanol.
Embodiment 2: under normal temperature, the cassava originating from Vietnam is dried, remove larger impurity.Get a certain amount of sample and carry out skin slag and ash content test, measuring method adopts ASTM standard (ASTME872-82, E1755-01), measurement result: skin slag and ash oontent are 8.3%.Cassava materials enters flush pot, add mass concentration be 0.08% dilute hydrochloric acid rinse, the dilute hydrochloric acid amount added is 100L/ (kg cassava).Flush time is 2h, and rinsing temperature is 90 DEG C.After dilute hydrochloric acid rinses, cassava epidermis and tiny coring are destroyed, the ash content that sedimentation removing is rinsed and other impurity of epidermis, and sedimentation adopts precipitation apparatus conventional in industry; Sedimentation is except to deash and after other impurity of epidermis, hydro-oxidation sodium is neutralized to neutrality; Dry, then grind screening, granularity is that the Tapioca Starch of 2mm is dried to constant weight, and detection skin slag and ash oontent are 0.6%, and under same experimental conditions, skin slag and the ash oontent of the Tapioca Starch after rinsing with water are that more than 4.2%(concentration is mass concentration).Under the same terms, the pretreatment process applying the alcohol yied after pretreated cassava fermentation of the present invention more traditional improves 5.5%, improves the productive rate of ethanol.
Embodiment 3: under normal temperature, gets cassava and dries, remove larger impurity.Get a certain amount of sample and carry out skin slag and ash content test, measuring method adopts ASTM standard (ASTME872-82, E1755-01), measurement result: skin slag and ash oontent are for being 7.3%.Cassava materials enters flush pot, add mass concentration be 0.01% dilute hydrochloric acid rinse, the dilute hydrochloric acid amount added is 20L/ (kg cassava).Flush time is 24h, and rinsing temperature is 50 DEG C.After dilute hydrochloric acid rinses, cassava epidermis and tiny coring are destroyed, the ash content that sedimentation removing is rinsed and other impurity of epidermis, and sedimentation adopts precipitation apparatus conventional in industry; Sedimentation is except to deash and after other impurity of epidermis, hydro-oxidation sodium is neutralized to neutrality; Dry and then grind screening, granularity is that the Tapioca Starch of 0.2mm is dried to constant weight, and detection skin slag and ash oontent are that more than 4.7%(concentration is mass concentration).Under the same terms, the pretreatment process applying the alcohol yied after pretreated cassava fermentation of the present invention more traditional improves 6.5%, can improve the productive rate of ethanol significantly.
Claims (2)
1. a pretreatment process for fuel ethyl hydrate raw material cassava, is characterized in that: dried by cassava normal temperature, wash with dilute hydrochloric acid, and sedimentation filtration removing impurity, is then neutralized to neutrality with sodium hydroxide, and grinding screening, dries and detect.
2. the pretreatment process of a kind of fuel ethyl hydrate raw material cassava according to claim 1, is characterized in that: concrete steps are as follows:
(1) dry pre-removal of impurities: dried by cassava under normal temperature, diagrid removes packing bag, the rope made of hemp, larger grit impurity;
(2) dilute hydrochloric acid washing: cassava materials enters flush pot, adds that mass concentration is 0.01% ~ 0.08%, the dilute hydrochloric acid of 20 ~ 100L/kg cassava carries out flushing 2 ~ 24h, rinsing temperature is 50 ~ 90 DEG C;
(3) filter: after dilute hydrochloric acid rinses, cassava epidermis and tiny coring are destroyed, the ash content that sedimentation removing is rinsed and other impurity of epidermis, sedimentation adopts precipitation apparatus conventional in industry;
(4) neutralize: sedimentation is except to deash and after other impurity of epidermis, hydro-oxidation sodium is neutralized to neutrality;
(5) dry: the cassava after neutralization is dried;
(6) grinding screening: by except deashing, the cassava grinding of impurity, the Tapioca Starch screening after grinding, granularity is that 0.2 ~ 2mm is for subsequent use;
(7) analyze: sieve size is that the Tapioca Starch of 0.2 ~ 2mm is dried to constant weight, then Tapioca Starch sample determination skin slag and dirt content is got, measuring method adopts ASTME872-82, E1755-01 standard, detect skin slag and ash oontent and be used as ethanol fermentation lower than the Tapioca Starch of ASTME872-82, E1755-01 standard.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110863018A (en) * | 2019-11-29 | 2020-03-06 | 陕西速源节能科技有限公司 | Method for preparing fuel ethanol by using corn |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4474883A (en) * | 1981-03-14 | 1984-10-02 | Mitsui Engineering & Shipbuilding Co., Ltd. | Process for saccharification of rootstocks and subsequent alcohol fermentation |
| CN101487024A (en) * | 2008-01-15 | 2009-07-22 | 中粮集团有限公司 | Method for preparing ethanol from tuber crops raw material |
| CN103981221A (en) * | 2014-05-29 | 2014-08-13 | 湖南尔康制药股份有限公司 | Method for preparing ethanol through cassava chip fermentation |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4474883A (en) * | 1981-03-14 | 1984-10-02 | Mitsui Engineering & Shipbuilding Co., Ltd. | Process for saccharification of rootstocks and subsequent alcohol fermentation |
| CN101487024A (en) * | 2008-01-15 | 2009-07-22 | 中粮集团有限公司 | Method for preparing ethanol from tuber crops raw material |
| CN103981221A (en) * | 2014-05-29 | 2014-08-13 | 湖南尔康制药股份有限公司 | Method for preparing ethanol through cassava chip fermentation |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110863018A (en) * | 2019-11-29 | 2020-03-06 | 陕西速源节能科技有限公司 | Method for preparing fuel ethanol by using corn |
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Effective date of registration: 20210716 Address after: 030006 room 1413, 14 / F, block C, clean control innovation base, No. 529, South Central Street, Taiyuan Xuefu Park, comprehensive reform demonstration zone, Taiyuan City, Shanxi Province Patentee after: Shanxi Zhibo Environmental Engineering Co.,Ltd. Address before: 037009 Shanxi province Datong Yuhe East Shanxi Datong University Patentee before: SHANXI DATONG University |