CN103740769A

CN103740769A - Technology using straw for combined production of ethanol and biogas

Info

Publication number: CN103740769A
Application number: CN201310662620.7A
Authority: CN
Inventors: 井力; 徐吉磊
Original assignee: QINGDAO TIANREN ENVIRONMENT CO Ltd
Current assignee: QINGDAO TIANREN ENVIRONMENT CO Ltd
Priority date: 2013-12-10
Filing date: 2013-12-10
Publication date: 2014-04-23

Abstract

The present invention provides a technology using straw for combined production of ethanol and biogas, and belongs to the technical field of new energy. The technology comprises the following steps: (1) pretreatment of the straw; (2) hydrolysis of the pretreated straw with dilute sulfuric acid with the mass fraction of 0.1%; (3) inoculation of saccharomycetes onto the material, distillation of ethanol after fermentation; (4) continuing fermentation of fermented glutinous rice and mash, which are remained after straw fermentation for production of the ethanol, for production of the biogas. The technology further improves the utilization of the straw, and the produced ethanol and biogas are green, environmentally friendly, economical, safe, reliable, and consistent with sustainable development concepts of environmental protection.

Description

The technique of a kind of stalk co-producing ethanol and biogas

Technical field

The invention belongs to technical field of new energies, be specifically related to the technique of a kind of stalk co-producing ethanol and biogas.

Background technology

In recent years, fossil energy is gradually exhausted, and environmental stress is day by day heavy, and energy demand and oil price present and continue the situation that rises, and countries in the world are all for tapping a new source of energy, particularly the substitute of gasoline and effort.In numerous biomass energies, fuel alcohol, because its production technique is simple, can be produced ethanol petrol, to the greenhouse gases of environmental emission, is the advantage such as zero, obtained the favor of the countries such as the U.S., Brazil, China has also proposed to greatly develop fuel alcohol in Eleventh Five-Year Plan.

At present, bio-ethanol main raw material is grain, the increase to ethanol demand along with bio-ethanol industrial expansion and market, and the consumption of grain is increasing.China is the country that world population is maximum, in order to guarantee national grain strategic security, country proposes the development strategy requirement that industrial production " is not striven ground, do not striven grain with people with grain ", and the project that National Development and Reform Committee is raw material production alcohol fuel for grain simultaneously is also no longer examined.In this case, develop aobvious particularly important of the production technology of non-grain ethanol.

China Shi Yige large agricultural country, the annual production of crop material is very huge, according to statistics, current straw utilization rate 33%, but after certain technical finesse, utilize only account for 2.6%, all the other are most of just as directly utilizations such as fuel, DEVELOPMENT PROSPECT is boundless.

In the production process of ethanol, a large amount of fermented glutinour rices and mash need to carry out harmless treatment as the waste in production technique, mostly treatment process is in the past fermented glutinour rice as feed or the main component of fertilizer is processed, and becomes derived product and sells profit.And mostly mash is to process as high COD sewage, not only need a large amount of one-time investments, in treating processes, the economic input of persistence is also absolutely necessary.Along with the development of biotechnology in recent years, using fermented glutinour rice and mash as raw material, carrying out anaerobically fermenting produces the technology of biogas and also becomes more and more ripe, fermented glutinour rice and mash are turned waste into wealth in a lot of alcohol production units, produce biogas Bing Wei enterprise and create more profit.

Summary of the invention

The technique that the object of this invention is to provide a kind of stalk co-producing ethanol and biogas.

A technique for stalk co-producing ethanol and biogas, this technique mainly comprises the following steps:

(1) stalk is carried out to pre-treatment;

(2) adopting massfraction is that 0.1% dilute sulphuric acid is hydrolyzed pretreated stalk, and the two is blended in to boiling 120～150 min at ℃ temperature of 12l～130;

(3) after boiling by pH regulator to 6.5-7.5, then to material inoculation yeast bacterium, at 35 ℃ of micro-oxygen environment bottom fermentation 12～24h, after having fermented, ethanol is carried out to rectifying;

(4) fermented glutinour rice remaining after stalk fermentation ethanol and mash inoculation anerobe are continued to fermentation and biogas production.

Further, wherein the described stalk of step (1) is maize straw, wheat stalk, broomcorn straw, cotton stalk.

Further, wherein step (1) stalk is carried out to pretreatment process is mechanical crushing method or steam explosion.

Further, the stalk after wherein processing in step (2) and the solid-liquid mass ratio of dilute sulphuric acid are l:10～20.

Further, wherein the yeast of inoculation is quality of material in step (3) 0.5～1.5%.

Further, wherein the described fermentation and biogas production of step (4) refers to and under the effect of lactic acid-producing bacteria and methanogen, carries out anaerobically fermenting.

The invention has the beneficial effects as follows the ethanol and the biogas that use this technique to make, environmental protection, economical and practical, safe and reliable, meet the environmental protection concept of Sustainable development, and the technique of this stalk co-producing ethanol and biogas has further improved the utilization ratio of stalk.

Accompanying drawing explanation

Fig. 1 is the process flow sheet of stalk co-producing ethanol and biogas.

Embodiment

Embodiment 1

(1) pre-treatment of maize straw, adopts filament-rubbing machine of crop straw that the maize straw of water ratio 80% is treated to the long wadding fibrous body of 2-3cm;

(2) adopt dilute sulphuric acid that wadding fibrous body is hydrolyzed, wherein the solid-to-liquid ratio of wadding fibrous body and 1.0% dilute sulphuric acid is l:10, and the two is blended in to boiling 120 min at 12l ℃;

(3) after boiling by pH regulator to 6.5-7.5, the yeast that is 0.5% by material inoculation quality mark, at 35 ℃ of micro-oxygen environment bottom fermentation 12h, carries out warm vacuum distillation in secondary after having fermented, ethanol is proposed;

(4) residue fermented glutinour rice is added to anaerobic fermentation tank, PH is adjusted to 7.5, and inoculation weight ratio is 10% natural pond liquid or mud, anaerobism mesophilic digestion 25 days, and the produced biogas centralized collection of fermenting, records biogas yield 4.3ml/ml.

Embodiment 2

(1) pre-treatment of maize straw, adopts steam explosion by heating raw materials to 240 ℃, maintains 15min High Temperature High Pressure and causes the softening of xylogen, then makes rapidly raw material decompression, causes the explosion of cellulose crystals and fibrous bundle, makes xylogen separated with Mierocrystalline cellulose;

(2) adopt dilute sulphuric acid to carry out cellulose hydrolysis, the ratio that is l:10 with 1.0% dilute sulphuric acid in solid-to-liquid ratio by above-mentioned pretreated stalk is mixed, boiling 120 min at 12l ℃;

(3) after boiling, PH is adjusted to 6.5-7.5, the yeast that is then 0.5% to material inoculation quality mark, at 35 ℃ of micro-oxygen environment bottom fermentation 12h, carries out warm vacuum distillation in secondary after having fermented, ethanol is proposed;

(4) residue fermented glutinour rice is added to anaerobic fermentation tank, pH regulator to 7.5, inoculation quality mark is 10% natural pond liquid or mud, anaerobism mesophilic digestion 25 days, the produced biogas focus utilization that will ferment, records biogas yield 10.3ml/ml.

Claims

1. a technique for stalk co-producing ethanol and biogas, is characterized in that, this technique mainly comprises the following steps:

(1) stalk is carried out to pre-treatment;

2. the technique of a kind of stalk co-producing ethanol according to claim 1 and biogas, is characterized in that, wherein the described stalk of step (1) is maize straw, wheat stalk, broomcorn straw, cotton stalk.

3. the technique of a kind of stalk co-producing ethanol according to claim 1 and biogas, is characterized in that, wherein stalk is carried out to pretreatment process is mechanical crushing method or steam explosion to step (1).

4. the technique of a kind of stalk co-producing ethanol according to claim 1 and biogas, is characterized in that, the stalk after wherein processing in step (2) and the solid-liquid mass ratio of dilute sulphuric acid are l:10～20.

5. the technique of a kind of stalk co-producing ethanol according to claim 1 and biogas, is characterized in that, wherein the yeast of inoculation is quality of material in step (3) 0.5～1.5%.

6. the technique of a kind of stalk co-producing ethanol according to claim 1 and biogas, is characterized in that, wherein the described fermentation and biogas production of step (4) refers to and under the effect of lactic acid-producing bacteria and methanogen, carries out anaerobically fermenting.