62results about How to "Increase ethanol concentration" patented technology

A strain of xylose-utilizing Zymomonas was engineered with a genetic modification to the glucose-fructose oxidoreductase gene resulting in reduced expression of GFOR enzyme activity. The engineered strain exhibits reduced production of xylitol, a detrimental by-product of xylose metabolism. It also consumes more xylose and produces more ethanol during mixed sugar fermentation under process-relevant conditions.

A biorefining process used to convert lignocellulosic biomass into ethanol via a fermentation pathway. In a first pretreatment process step, the biomass is mixed with an aqueous wash solution to remove soluble carbohydrates from the biomass structure. Next, the solid fraction is separated from a liquid fraction. In a second pretreatment process, the solid fraction is pre-treated to make the fiber bundles and complex polysaccharides more amenable to enzymatic hydrolysis. Following the second pretreatment process, the pre-treated biomass is subjected to one or more enzymes in a hydrolysis process. The liquid fraction isolated from the first pretreatment process is diverted past the second pretreatment process and is recombined with the solid fraction in the hydrolysis process. The enzyme cocktail in the hydrolysis process breaks down the alpha- and hemicellulose polymers into fermentable sugars. Finally, a fermentation process produces a “beer” that is further processed in a distillation and dehydration process.

As one example, an engine system for a vehicle is provided, including an internal combustion engine having at least one cylinder; a fuel system configured to provide a fuel to the cylinder; an ignition system including at least a spark plug; a control system configured to vary a level of ignition energy provided to the cylinder via the spark plug in response to a composition of the fuel provided to the cylinder by the fuel system. A method of operating the engine system by varying a level of ignition energy provided to the engine after a start-up is also provided.

A process for preparing fermented high-concentration alcohol liquid from raw rice grains includes such steps as pulverizing, sieving by more than 40 meshes, dissolving in water at 34-36 deg.C, addingcomposite enzyme prepared from beta-amylase, alpha-emylase, acidic proteinase, cellulose, xylanase, pectase, phytase and dry yeast, and fermenting at 30-40 deg.C for 60-95 hr. Its advantages are simple process, low cost and high concentration.

The invention provides a synchronous saccharification and ethanol fermentation method with lignocelluloses treated by a steam explosion method as raw material. The method comprises the following steps of taking the lignocelluloses treated by the steam explosion method as raw material and directly as a substrate without detoxification, adding mixed enzyme comprising cellulase and beta-glucosaccharase, simultaneously inoculating (Saccharomyces cerevisiae) Y5 with CGMCC (China General Microbiological Culture Collection Center) NO. 2660, adding a nitrogen source, and carrying out ethanol fermentation production. According to the method, the step of detoxification by washing the lignocelluloses (such as maize straw) pre-treated by steam explosion is omitted, and the final fermented product of ethanol of high concentration is obtained. For example, the concentration for steam explosion of the maize straw is 30%, synchronous saccharification and fermentation time is 96 hours, and the ethanol concentration of a reactor of 100ml, a reactor of 3000ml and a fermentation tank of 5L respectively reaches 50g/L, 47.8g/L and 47.5g/L. The production technology is greatly simplified, the equipment investment is lowered, water consumption is reduced, and the production cost is lowered.

The invention discloses a method for improving the yield of simultaneous saccharification and fermentation lignocellulose ethanol. The method comprises the following steps of: heating straws in a steam explosion reactor by using steam, releasing the pressure instantaneously so as to obtain a solid-liquid mixture; separating the solid from the liquid; sterilizing the obtained solid by using high-temperature steam; mixing the sterilized solid, cellulase and sterile water, adjusting the pH value and enzymolyzing; introducing high-temperature resisting yeast so as to ferment; separating the solid from the liquid so as to obtain a liquid, namely, a fermented liquid which is rich in ethanol. By utilizing the method, the efficiency of enzymolysis and fermentation is improved; the diastatic fermented solid content is high; the obtained fermented liquid is high in ethanol concentration; the water resource is saved.

The invention discloses a method for producing high-concentration ethanol by the mixed fermentation of starch and molasses which are used as raw materials. The method comprises the following steps of: adding water to the raw material of starch and stirring to constant volume, liquefying at low temperature and simultaneously fermenting and saccharifying, and then adding the raw material of molasses for mixed fermentation through the batch or continuous flow feeding supplement way. The mixing ratio of the raw materials of starch and molasses is 1:2-8:1 (W/V), the temperature of fermentation is 30-37 DEG C, the time of fermentation lasts for 40-48h, the percentage of ethanol yield is 12.43-16.67% (V/V). The invention changes the traditional single raw material fermentation way, and not only improves the total sugar concentration of the fermented mash, but also reduces the viscosity of starch raw mash and improves the liquidity, so the concentration of ethanol in the fermentation mash is increased, and the raw material utilization rate is improved, and ethanol distillation energy consumption and production cost are decreased, the amount of sewage discharge is reduced, the load of sewage treatment is lowered and the ethanol production process is more economical and environmentally friendly.

This invention provides a biofilm resistant material comprising an active agent, which active agent consists essentially of an insoluble copper oxide at a concentration of between 3 and 10% w/w of said biofilm resistant material and uses thereof.

The invention discloses a method for solid state fermentation of ethanol through steam explosion of cassava and comprehensive utilization of the cassava. In the method, the steam explosion technology is applied to the pretreatment of the cassava. On one hand, under the action of high-temperature water vapor of the steam explosion pretreatment, cyanogenetic glycoside in the cassava raw material is converted into volatile hydrocyanic acid for volatilization, the toxic action of the cyanide in the cassava product is removed, and the utilization ratio of the follow-up resource is improved; on the other hand, the cassava after the steam explosion pretreatment can be directly fermented to produce the ethanol, and the energy consumption for crushing the cassava and stewing and liquefying the starch is greatly reduced. The cassava is subjected to solid fermentation, so that the water content in the fermenting mash is greatly reduced. Therefore, the ethanol concentration in the fermenting mash is increased, the distillation energy consumption is reduced, subsequent wastewater treatment is reduced, the problems that the alcohol dregs obtained by the traditional fermentation process have large water content, low nutritive value and difficult utilization are solved, the production cost is reduced, and the method is favorable for the comprehensive utilization of the cassava.

The invention pertains to the bio-engineering technical field, disclosing a fermentation method of alcohol with high concentration. The invention overcomes the shortages of low fermentation efficiency and long fermentation time, etc., of the existing alcohol fermentation technique. The invention adopts the steps that: bacteria-free air is introduced at the first stage; after 8 to 30 hours fermentation, material and fermentation agent are added under the temperature of 25 to 35 DEG C, oscillated or stirred with a rotation speed of 10-500r/min for 50 to 66 hours; the high concentration alcohol is made, and the volume concentration of the alcohol in the fermentation liquid is up to 16 to 18 percent. The invention can fast and effectively produce the high concentration alcohol.

Methods of and system for growing higher and stronger levels of yeast in the Yeast Tank and Fermenter Tank during the fermentation filling cycle are provided. The yeast growth is reconfigured by continuing pumping yeast under the most active conditions while at a lower YCC (yeast cell count) into the Fermenter Tank during a filling period. A measurable and useful parameter, % DT/% Yeast by weight ratio (or “food” to yeast ratio), is introduced (e.g., % DT=glucose), which offers information on the health status of the yeast.

The present invention relates to a modified yeast strain of Saccharomyces cerevisiae having MCC accession number 0069 with osmo-tolerant, thermo-tolerant, ethanol tolerant and self-flocculation properties. Further, the present invention relates to a method for obtaining modified yeast strain. The present invention also relates to a method of production of ethanol at high temperature using said yeast strain. The ethanol produced by the method disclosed in the present invention is used as fuel.