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1354 results about "Xylose" patented technology

Xylose (cf. Greek: ξύλον, xylon, "wood") is a sugar first isolated from wood, and named for it. Xylose is classified as a monosaccharide of the aldopentose type, which means that it contains five carbon atoms and includes an aldehyde functional group. It is derived from hemicellulose, one of the main constituents of biomass. Like most sugars, it can adopt several structures depending on conditions. With its free aldehyde group, it is a reducing sugar.

Methods for preparing ethylene glycol from polyhydroxy compounds

This invention provides methods for producing ethylene glycol from polyhydroxy compounds such as cellulose, starch, hemicellulose, glucose, sucrose, fructose, fructan, xylose and soluble xylooligosaccharides. The methods uses polyhydroxy compounds as the reactant, a composite catalyst having active components comprising one or more transition metals of Groups 8, 9, or 10, including iron, cobalt, nickel, ruthenium, rhodium, palladium, iridium, and platinum, as well as tungsten oxide, tungsten sulfide, tungsten hydroxide, tungsten chloride, tungsten bronze oxide, tungsten acid, tungstate, metatungstate acid, metatungstate, paratungstate acid, paratungstate, peroxotungstic acid, pertungstate, heteropoly acid containing tungsten. Reacting at a temperature of 120-300° C. and a hydrogen pressure of 1-13 MPa under hydrothermal conditions to accomplish one-step catalytic conversion. It realizes efficient, highly selective, high yield preparation of ethylene glycol and propylene glycol from polyhydroxy compounds. The advantage of processes disclosed in this invention include renewable raw material and high atom economy. At the same time, compared with other technologies that converts biomass raw materials into polyols, methods disclosed herein enjoy advantages including simple reaction process, high yield of targeted products, as well as easy preparation and low cost for the catalysts.

Method for purifying, reclaiming and condensing sugar in lignocellulose prehydrolysis liquid

ActiveCN101787398AEasy to operateEasy for industrialized continuous productionGlucose productionCelluloseFiltration membrane
The invention relates to a method for reclaiming and condensing sugar and removing toxicity inhibitors in lignocellulose prehydrolysis liquid by the applied nanofiltration technology. The method is realized by the following scheme: the pH value of the lignocellulose prehydrolysis liquid is firstly adjusted to 2.0-5.0, and the filtration pretreatment is carried out to remove suspended impurities; and then a filtration membrane is used for condensing sugar and remove inhibitors, the sugar of glucose, xylose and the like is trapped by the nanofiltration membrane, the weakly acidic inhibitors (formic acid, acetic acid, levulinic acid and the like) and the furfural inhibitors (furfural, 5-hydroxymethyl furfural and the like) continually penetrate through the nanofiltration membrane, the various inhibitors in the prehydrolysis liquid are removed, and the sugar in the prehydrolysis liquid is condensed to realize the purification, reclaiming and condensation of the sugar in the prehydrolysis liquid, so that the fermentability of the sugar is improved. The invention has the advantages of simple and safe operation, high efficiency and energy saving, and facilitates the continuous production; the nanofiltration has effects of purification, reclaiming and condensation; and the method can realize the industrial production.

Method for producing chicken flavor essence base material by using chicken framework

The invention relates to a method for producing a chicken flavor essence base material by using a chicken framework, which comprises the following steps: firstly, crushing the cleaned chicken framework by a bone crusher, grinding the crushed chicken framework into chicken bone cement of which diameter is 10 +/- 5mu m by a colloid grinder, directly delivering the chicken bone cement into a reaction kettle without high-temperature boiling, adding water into the chicken bone cement to make the solid content reach 8 percent, and adjusting the pH to 7.0 by using 10 percent NaOH solution; adding 0.5 to 1.5 percent of composite proteinase by mass of the chicken bone cement into the mixture, and carrying out enzymolysis for 3 to 5 hours at a temperature of 55 DEG C; adding a thermal reaction mixture into the reaction kettle; heating the reaction kettle to make the mixture react at a temperature of between 100 and 125 DEG C; and after reacting for 30 to 180 minutes, obtaining the essence base material with intense chicken flavor, wherein the thermal reaction mixture comprises: 5 to 15 percent of glucose, 5 to 10 percent of xylose, 1 to 3 percent of cysteine hydrochloride, 1 to 3 percent of glycin, 30 to 50 percent of enzymolysis liquid, 1 to 5 percent of chicken fat, 5 to 20 percent of yeast powder, and 0.5 to 1.5 percent of vitamin B1.

Clostridium beijerinckii and method for preparing biological butanol through fermentation of xylose residue serving as raw material thereof

Disclosed is a clostridium beijerinckii capable of producing butanol with high yield. The classification and nomenclature of the clostridium beijerinckii is Clostridium beijerinckii Y-3, with an accession number of CGMCC 5805. The method for preparing biological butanol through fermentation of xylose residue serving as raw material in the invention comprises the steps of performing calcium hydroxide detoxification pretreatment, carrying out anaerobic hydrolysis, preparing C. beijerinckii Y-3 anaerobic fermentation medium and adopting fermentation to produce biological butanol. According to the invention, the high-yielding butanol bacterial strain screened by using ethyl methyl sulfonate (EMS) mutation, starch plate and 2-deoxy-D-glucose plate is capable of producing butanol by using xylose residue treated by calcium hydroxide detoxification process as raw material and through fermentation. In this way, the problems of inadequate strain ability and raw material shortage during the process of producing butanol through traditional biological fermentation are solved and the transformation from industrial waste to high value-added biological energy is realized. The method is an environment-friendly method for preparing biological butanol and has a wide prospect of industrial application.

Method for preparing furfural by xylose dehydration through fixed bed catalysis

ActiveCN102391218AEasy to escapeHigh yieldOrganic chemistryXyloseAldehyde
The invention discloses a method for preparing furfural by xylose dehydration through fixed bed catalysis, which comprises the following steps: adding a 1-3 mol/L acid catalyst solution into a reaction vessel, adding a cocatalyst of NaCl till saturation is achieved, heating to backflow, stirring to form a rotating liquid level of a catalyst layer with a fixed volume and concentration, jetting 10-20 wt% of xylose solutions obtained by straw hydrolyzation through dilute acid catalysis into the reaction vessel with a certain speed, performing xylose dehydration, and performing rectification to obtain a furfural solution with a purity of up to above 99% and a furfural yield of 50-70 wt%. The advancement of the invention is that the heating temperature is adjustable, which allows the volume of the xylose solution jetted into the reaction vessel to be maintained to be equal to the volume of the distilled furfural solution; the concentrations of the acid catalyst and the cocatalyst are constant; the volume of the catalyst layer is constant; the reaction process is maintained to be stable; continuous production is realized; the water phase of furfural-water separation returns to the hemicellulose hydrolyzation procedure for recycle; no waste water is discharged; the furfural yield is increased twice when compared with the yield of traditional production processes.

Blueberry composite tablet candy capable of relieving visual fatigue and preparation method thereof

The invention discloses a blueberry composite tablet candy capable of relieving visual fatigue and a preparation method thereof. The blueberry composite tablet candy capable of relieving the visual fatigue comprises the following raw materials in percentage by weight: 13.25 percent of a blueberry extract, 0.5 percent of lutein esters, 0.3 percent of beta-carotene, 1.0 percent of citric acid, 64.45 percent of sorbitol, 2 percent of xylooligosaccharide, 3 percent of dextrin and 15 percent of microcrystalline cellulose, wherein the blueberry extract is extracted from a mixture of blackberry pomace dry matter and acid ethanol; the acid ethanol comprises ethanol and water with the volume percentage of 60 percent; the pH value of the acid ethanol is 1.5 to 3.0; the blackberry pomace dry matter and the acid ethanol are in the mass volume ratio of 1:50-1:70; the preparation method of the blueberry composite tablet candy capable of relieving the visual fatigue comprises the following main steps: 1, preparing the blueberry extract; 2, crushing; 3, mixing; 4, granulating; 5, tabletting; 6 packaging. The blueberry composite tablet candy capable of relieving the visual fatigue can effectively relieve the visual fatigue, can improve eyesight after long-term eating, and is convenient to take; a new using way is provided for utilizing fresh blueberry and fully playing intentional physiological and pharmacological efficacies.

Industrial Saccharomyces cerevisiae bacterial strain by using CRISPR/Cas9 system for knocking out XKS1 gene and construction method

The invention discloses an industrial Saccharomyces cerevisiae bacterial strain with XKS1 gene knockout for high efficient production of xylitol, the bacterial strain is named SEB9, and a preservationnumber is CGMCC No.14272; the invention also relates to a construction method of the Saccharomyces cerevisiae bacterial strain, and the method comprises the following steps: a KanMX gene of an initial strain is knocked out in order to construct a KanMX-bacterial strain, and a KanMX-bacterial strain with high xylitol yield is screened; the XKS1 gene of the screened KanMX-bacterial strain is knocked out in order to construct a delta XKS1 bacterial strain, and a delta XKS1 bacterial strain with high xylitol yield is screened. A CRISPR/Cas9 gene editing technology is used, the XKS1 gene can be rapidly and fast knocked out by one-time yeast conversion, in order to block further metabolism from xylosone into D-xylulose 5-phosphate, and obtain the bacterial strain with high-yield of xylitol; compared with the initial strain, the Saccharomyces cerevisiae bacterial strain SEB9 prepared by the construction method has superior performance for producing xylitol by fermentation of xylose, the yield may reach a theoretical value 1.0, yield and production of xylitol are effectively improved, and the strain has good application prospects.

Method of low metal loading catalyst for preparing glycol from carbohydrate

The invention provides a method of applying a low metal loading catalyst for preparing glycol and propylene glycol from carbohydrate, including cellulose, starch, semi-cellulose, cane sugar, glucose, fructose, fructosan, xylose, and soluble xylo oligosaccharide. In the method, carbohydrate is taken as the raw material, the compound catalyst is composed of catalytic active components selected from one or more components from following components: highly-disperse and low-loading ruthenium, inorganic compounds, organic compounds, and complex of tungsten, or simple substance tungsten, then one-step catalytic conversion process is carried out under the hydrothermal conditions: temperature of 60 to 350 DEG C, and hydrogen pressure 0.1 to 15 MPa, and the high-efficient, high-selective and high yield preparation of glycol and propylene glycol from carbohydrate is achieved. The method takes highly-disperse and high stability low loading Ru-based catalyst as the reaction catalyst, so the usage amount of value metals is reduced, the loss of catalyst carrier is slowed down, and the recycle rate of Ru-base catalyst is increased. The catalyst has the prominent advantages of high activity, high selectivity, and very high cyclicity. Compared to other technologies, which prepare polyol from carbohydrate, the method has the advantages of simple reaction process, high efficiency, good stability of catalyst, and multi-circulation, and has very vast industrial application value.
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