Solid-state fermentation method and system for producing ethyl alcohol based on sugariness raw material

A technology of solid-state fermentation and solid-state fermentation tank, which is applied in the field of biomass liquid fuel production, can solve the problems of high cost of raw material pretreatment, low efficiency of brewing process, and long fermentation cycle, so as to improve equipment utilization and production efficiency, and promote maximum The effects of limited mixing and maintaining fermentation temperature

Inactive Publication Date: 2008-07-16
TSINGHUA UNIV
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AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the defects of high raw material pretreatment cost, long fermentation cycle and high energy consumption in the current liquid fermentation process of sweet sorghum ethanol production, as well as the low efficiency of winemaking process in traditional solid state fermentation method, based on the invention of the inventor. Based on the drum-type solid-state fermentation system, the inventor's proprietary strains are used to efficiently and quickly convert the fermentable sugar in crushed materials such as sweet sorghum stalks into ethanol, which improves the actual yield of ethanol and reduces energy consumption and cost. Realize the commercial operation of solid-state fermentation to produce ethanol technology

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  • Solid-state fermentation method and system for producing ethyl alcohol based on sugariness raw material

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Embodiment 1

[0045] The sweet sorghum stalks with a water content of 70% and a hammer degree of 15° (the actual total stalk sugar is 9-10%, reducing sugar 4-5%) are used as raw materials, cut and crushed into filaments (diameter Φ 1~ 3mm, length L 5~10cm), the TSH-Sc-1 strain selected and cultivated by the inventors is directly fermented in solid state fermenter, the inoculum is 10% (m / m), the fermentation time is 40hr, and the stirring rate Control at 1-10rpm. After solid-state distillation, ethanol was obtained. The ethanol yield was 4.23g / 100g sweet sorghum stalks, reaching 87.16% of the theoretical value; the residual total sugar was 0.37%, and the reducing sugar was 0.20%.

Embodiment 2

[0047] Taking 1 ton of sweet sorghum stalks with a water content of 68% and a hammer degree of 18° (the actual total sugar in the stalk is 13-14%, and the reducing sugar is 7-8%) as raw materials, they are cut and crushed into filaments (diameter Less than 5mm, length less than 30mm), the TSH-Sc-1 strains selected and cultivated by the inventors are directly fermented in a solid fermentor, the inoculum is less than 20% (m / m), the fermentation time is 42hr, and stirring The speed is controlled at 1-15 rpm, and it rotates periodically. After solid-state distillation, 60.5 kg of 99.5% ethanol was obtained. The ethanol yield was 6.05Kg / 100Kg sorghum stalks, which reached 90.36% of the theoretical value; the residual total sugar was 0.751%, and the reducing sugar was 0.375%.

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Abstract

The invention relates to a solid-state fermentation method for ethanol production based on sweet sorghum stalks (including other sugar raw materials, such as, sugar beet, sugar cane, Jerusalem artichoke, etc) and a system, which pertains to the technical field of the processing of biomass liquid fuel. The method mainly includes the following key processes and core equipments: (1) smashed materials are fed into a tank with the help of the rotary motion of a cylinder body of a rotating drum type solid-state fermentation tank and the dual-function of the inclined angle of the tank body (1 to 15 degrees) and a feeding stirring board so as to be evenly mixed with the high-yield ethanol TSH-Sc-1 yeast liquid which is prayed from a sprayer; (2) the solid-state fermentation is carried out in the facultative oxygen environment, the fermentation tank is rotated at an even speed to promote the mixing of materials and the strengthening of heat transfer, thus the fermentation is always in a best condition and the fermentation time is shortened; (3) on-line monitoring is carried out: the solid-state fermentation is affected by a plurality of factors, such as, the distribution of the on-line regulation temperature of a computer, spray amount, the concentration of dissolved O2, filling factors, the mixing degree of the smashed materials and the yeast liquid, the pH value of yellow slurry, CO2 concentration, ethanol concentration, the migration of bacteria species and other parameters so as to ensure that the solid-state fermentation is carried out under a best working condition; (4) the automatic discharge of the fermentation material from the tank is realized with the help of the rotation of the tank body and the push of a discharging stirring board, and a closed tunnel belt is adopted for conveying the fermentation material to an ethanol-dreg separation unit.

Description

Technical field [0001] The invention relates to a solid-state fermentation method and system for producing ethanol from crushed sweet sorghum stalks (including other carbohydrate raw materials, such as sugar beet, sugar cane, Jerusalem artichoke, etc.), in particular to a solid-state fermentation method based on crushed sweet sorghum stalks The integrated technology and equipment for ethanol production belong to the technical field of biomass liquid fuel production. Background technique [0002] At this stage, the international oil price once exceeded US$100 / barrel, which drove up the price of food and other related products. The energy shortage has affected the sustainable development of the economy and society. At the same time, CO 2 The issue of emission reduction is also a common issue facing the world. For this reason, it has become a consensus of mankind to vigorously develop renewable energy and reduce oil consumption. In 2006, the world’s production of bio-liquid fuels wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/06C12M1/36C12R1/645
CPCY02E50/17Y02E50/10
Inventor 李十中李天成
Owner TSINGHUA UNIV
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