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Biological butanol equipment

Features:
Biological butanol equipment is a production equipment for producing butanol by microbial fermentation. Generally, it takes starch agricultural and sideline products such as wheat, corn and cassava, or sugar products such as pulp waste liquid, molasses, sugarcane and sugar beet as raw materials, obtains hydrolysate through physical or biological treatment, and then uses the enzyme secreted by acetone butanol bacteria to undergo complex biochemical changes, Acetone, butanol and ethanol are produc

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Biological butanol equipment 

Biological butanol equipment is a production equipment for producing butanol by microbial fermentation. Generally, it takes starch agricultural and sideline products such as wheat, corn and cassava, or sugar products such as pulp waste liquid, molasses, sugarcane and sugar beet as raw materials, obtains hydrolysate through physical or biological treatment, and then uses the enzyme secreted by acetone butanol bacteria to undergo complex biochemical changes, Acetone, butanol and ethanol are produced from the fermentation broth, and butanol can be obtained by distillation. Its process equipment is similar to alcohol production, with cheap raw materials, wide sources and small equipment investment;

Biological butanol equipment adopts the fermentation method, with mild production conditions, generally slightly higher than normal temperature operation, and does not need precious metal catalysts.

As an automobile fuel, butanol has the following advantages compared with ethanol:

High energy content, vehicle can travel 30% more than ethanol;

The volatility of butanol is 1 / 6 times that of ethanol and 1 / 13.5 of that of gasoline. When mixed with gasoline, butanol has great tolerance to water and better adaptability to humidity and low water vapor pressure;

Butanol can be used in the existing fuel supply and distribution system, while ethanol needs to be transported by rail, ship or truck;

Compared with other biofuels, it is less corrosive and safer than ethanol and gasoline;

Compared with the existing biofuels, the mixing ratio of bio butanol and gasoline is higher, there is no need to transform the vehicle, and the economy of mixed fuel is higher;

Compared with ethanol, it can improve the fuel efficiency and mileage of vehicles;

The biofuel butanol produced by fermentation will reduce greenhouse gas emissions. Like ethanol, no Sox or NOx is produced during combustion, which is beneficial to the environment;

Bio butanol equipment, problems in development and Countermeasures

The early butanol fermentation industry declined because of its high cost, which is inferior to petrochemical products, which is also the bottleneck restricting its large-scale development. According to the analysis of industry experts, if the crude oil price remains above $80 / barrel, the market opportunity of biological butanol will have a large market.

Biological butanol equipment. Common problems in traditional fermentation industry include:

The yield of butanol is low. Due to the toxic effect of butanol on bacteria, the mass concentration of butanol was less than 13 g / L, the yield of butanol was less than 4.46 s / (L h), and the yield of butanol was less than 25% (mass fraction).

The final concentration of solvent is low. In traditional ABE fermentation, the total solvent mass fraction is 2% and the water mass fraction can reach more than 98%. The conventional distillation method increases the consumption of equipment, power and energy, which is also the key to the high cost of butanol.

The proportion of butanol in the total solvent is low, generally accounting for only 60%, the other 30% is acetone and 10% is ethanol, which increases the cost of butanol recovery and separation in the later stage.

Traditional butanol fermentation generally uses corn and molasses as raw materials. With the rise of food prices and the lack of food resources in the world, the development of butanol will be at a disadvantage.

Biological butanol equipment must be transformed and upgraded for the traditional butanol fermentation industry. The specific strategies are as follows:

(1) Improve existing strains. Genetic engineering and metabolic engineering technology are used to remove the inhibition of possible products or intermediates in the metabolic process, improve the strain's tolerance to butanol, strengthen the key enzymes in butanol production, cut off the generation and metabolism of acetone and ethanol, and improve the proportion of butanol in solvent.

(2) The economic and effective methods of recovering butanol from dilute fermentation broth were studied, such as pervaporation, stripping, liquid-liquid extraction and so on.

(3) Optimization and commercialization of butanol fermentation process with knowledge of enzymology, microbial physiology and fermentation technology.

(4) Expand the variety of fermentation raw materials, improve the raw material pretreatment method, and reduce the butanol cost through systematic research:

Widely use cheap and easily available wood fiber raw materials. The raw materials that can ferment to produce butanol include corn, molasses, whey, glucose, etc. In recent years, some agricultural wastes, such as rice straw, corn fiber and orchard defective fruit, have also been used as fermentation substrates. Among them, the cost of producing bio butanol from substances rich in lignocellulose such as agricultural and forestry by-products, organic wastes and straw is lower than that of corn and molasses. After large-scale production, its price is closer to that of butanol in petroleum industry, which has commercial prospects. Making full use of crop straw has become one of the important topics of agricultural development. study effective pretreatment methods to increase the effectiveness of microbial or enzymatic hydrolysis of lignocellulose. The treatment of wood fiber raw materials with dilute acid at high temperature will produce furfural and other substances toxic to microbial fermentation. The development of chemical and biological detoxification hydrolysates and the study of detoxification mechanism are of great significance to speed up the fermentation efficiency and reduce the process cost.

The high yield fermentation system of biofuel was studied with lignocellulose. Multistage continuous fermentation, immobilized fermentation and cell cycle high-density fermentation were used to ensure the vitality of microorganisms through the study of microbial tolerance to high substrate concentration, fermentation inhibitors, organic acids and alcohols.

In order to improve the economy of the process, the steps in the bioreactor can be coupled to simultaneously produce biofuel butanol through enzyme / microbial saccharification fermentation downstream technology.

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