410results about "Saccharides production" patented technology

The invention relates to a method for preparing xylose by using squeezed waste alkali in the viscose fiber production process. According to the method, xylose finished products are obtained through work procedures of hemicellulose solution preparation, hemicellulose extraction, hemicellulose hydrolysis, neutralization and deacidification, preconcentration, decoloration, ion exchange, ordinary concentration, crystallization, separation and drying. When the technical scheme provided by the invention is adopted, harmful environment-pollution substances such as waste alkali and waste water generated in the viscose production process can be thoroughly eliminated, the standard of full-flow-process clean production can be reached, viscose production enterprises can also produce xylose in the viscose production process, the goal of environment protection is reached, and meanwhile, the waste reutilization is also realized.

The invention relates to a method for producing a wood sugar product and a byproduct of ethanol or D-ribose or citric acid. The method takes hydrolysis liquid, wood sugar mother liquor and/or production waste liquid containing pentose of agricultural or forestry waste as the raw materials, comprising the following steps: (a) preprocessing feed liquid; (b) colour spectrum separation: separating thefeed liquid into arabinose fraction feed liquid and wood sugar fraction feed liquid; (c) removing mixed sugar at least containing glucose and galactolipin; and (d) carrying out aftertreatment on thewood sugar fraction feed liquid to obtain the wood sugar product. The wood sugar product comprises xylitol and D-wood sugar. The invention has low production cost and high efficiency and is suitable for large-scale industrial production.

A reverse phase column chromatographic process of purification of 6-acetyl-4,1′,6′trichlorogalactose and 4,1′,6′trichlorogalactose is described which uses silanized silica as stationary phase and water or predominatly aqeous mixture derived from water and small proportion of organic solvents as a mobile phase.

The invention relates to a method for producing L-arabinose and D-xylose, which can simultaneously produce ethanol or D-ribose or citric acid as a byproduct. The method utilizes a hydrolyzate of agricultural waste, a xylose mother liquor and/or a production waste liquor containing pentose as the raw materials and comprises the following steps: (1) pretreating the raw materials; (b) carrying out the chromatographic resolution to separate the raw materials into an arabinose-stage liquor and a xylose-stage liquor; (c1) removing fermentation inhibitors which are impurities and unwanted bacteria, which have an inhibiting effect on the fermentation; (c2) fermenting to remove unwanted saccharides at least comprising glucose and galactose; (d) and finally, respectively carrying out the post treatment on the arabinose-stage liquor and the xylose-stage liquor to obtain the L-arabinose and the D-xylose. Steps (c1) and (c2) are arranged before the chromatographic resolution in step (b) or after step (b). The method has the advantages of low production cost and high efficiency, and is suitable for large-scale industrial production.

The invention relates to a lignocellulose acid/alkali coupling pretreatment method. Lignocellulose is separated into cellulose, hemicellulose and lignin by acid/alkali coupling pretreatment; and simultaneously, lignocellulose components are separated and subjected to high-efficiency enzymolysis and saccharification. The method comprises the steps of lignocellulose pretreatment, component separation, cellulose enzymolysis, solvent recovery and the like. The lignocellulose material is pretreated by formic acid or dilute sulphuric acid and is then subjected to solid-liquid separation, wherein the liquid component is used for recovering hemicellulose hydrolyzed sugar and part of lignin; and the solid component is further treated by ammonia water or a sodium hydroxide solution and is then subjected to solid-liquid separation, the liquid component is used for recovering lignin, and the solid component (cellulose) is subjected to enzymolysis and saccharification. By converting the lignocellulose into cellulose hydrolyzed sugar (glucose), hemicellulose hydrolyzed sugar (xylose and xylooligosaccharide) and lignin, the invention provides a basis for full-biomass utilization and develops a green process route for recovering the pretreatment solvent.

The invention discloses a method for utilizing straw biomass by grades, comprising the following steps: carrying out steam explosion to straw biomass; extracting and separating water soluble constituents and water insoluble constituents in steam exploded straw by water, wherein the water soluble constituents are purified and concentrated to obtain active low polyxylose and xylose and the water insoluble constituents are used for further fermentation to generate ethanol; and extracting lignin from the fermentation residue. The invention realizes the maximization of utilization of biomass and overcomes the disadvantages of high production cost, low efficiency and environmental pollution and the like in the prior art.

The invention provides a preparation technology of xylose, which mainly comprises the following technical steps: hydrolyzation, ultrafiltration purification, primary decoloring, electrodialytic deacidification and desalination, membrane concentration, primary evaporation and concentration, secondary decoloring, ion exchange refined desalting, secondary evaporation and concentration, crystallization, centrifugation, and drying to obtain a finished product xylose crystal. The technology has the advantages that the membrane technology is used to remove macromolecule impurities of colloid, protein, and the like in xylose hydrolysate, electrodialytic deacidification and desalination technology is used to lower the electric conductivity of an xylose solution, and meanwhile, neutralization and positive-negative-positive resin combined one-step purification process is removed to simplify the technical process; therefore, the manufacturing cost of xylose is lowered, meanwhile, the waste water discharge load of the manufacturing of xylose can be allowed to be lowered by more than 40%, and well environmental benefits and economic benefits are achieved.

The invention relates to a clean technique for co-producing xylose, xylitol and arabinose from agricultural and forestal waste, belonging to the field of utilization of agricultural and forestal waste. The technique comprises the following steps: pretreating and preprocessing the raw material, and hydrolyzing in a thermophilic digestion mode to prepare a hemicellulose hydrolysate; after centrifugalizing to remove solid residues, carrying out TiO2-loaded activated carbon photocatalysis or ion exchange resin decolorization and detoxification treatment on the hydrolysate; carrying out MVR (mechanical vapor recompression) concentration treatment and gradient-cooling crystallization to obtain a xylose product and a xylose mother solution; fermenting L-arabinose unconverted xylitol fermentationhigh-yield strain xylitol by using the xylose mother solution as the medium to produce the xylitol; centrifugalizing to remove thalli, and carrying out decolorization and desalting treatment by membrane-process or resin adsorption; separating by using a simulated moving bed or chromatographic separation technology to obtain a xylitol phase and an L-arabinose phase; and carrying out MVR or vacuum concentration treatment on the two phases, and crystallizing in a gradient programmed cooling mode to respectively obtaining a xylitol product and an L-arabinose product, wherein the two mother solutions can be recycled.

The invention relates to a solvent for separating biomass, and application thereof in selective separation of biomass. The system consists of ionic liquid, an organic solvent and water, wherein the ionic liquid is imidazole ionic liquid; the organic liquid comprises one or a plurality of methanol, ethanol, formic acid, acetic acid, dioxane or tetrahydrofuran; the components of the mixed solvent are conditioned according to the dissolution and hydrogen bond theories; and the mixed solvent is capable of hydrolyzing semicellulose and lignin under a certain hydrogen bond capability and a dissolution parameter and reserving solid high purity cellulose, and is capable of completely dissolving and hydrolyzing the biomass under another hydrogen bond capability and another dissolution parameter. By adding the water for precipitation and filtering for separation, crude lignin and hydrolysis sugar of carbohydrate can be obtained. The biomass can be selectively separated and transformed by controlling the mixing ratio of the three components; besides, the application of the solvent for separating biomass is moderate in condition, simple in process and environment-friendly; furthermore, all the components of the solvent system can be recovered and reused.

The invention relates to a method for producing L-arabinose, which can simultaneously produce ethanol, D-ribose and citric acid as byproducts. The method utilizes a hydrolyzate of agricultural waste, a xylose mother liquor and/or a production waste liquor containing pentose as the raw materials and comprises the following steps: (a) pretreating the raw materials; (b) carrying out the chromatographic resolution to separate the raw materials into an arabinose-stage liquor and a xylose-stage liquor; (c) removing impurities and unwanted bacteria, which have an inhibiting effect on fermentation, as well as unwanted saccharides at least comprising glucose and galactose; (d) and carrying out the post treatment on the arabinose-stage liquor to obtain the L-arabinose. Steps (c1) and (c2) are arranged before the chromatographic resolution in step (b) or after step (b). The invention has the advantages of low production cost and high efficiency, and is suitable for large-scale industrial production.

The invention relates to a clean and high-efficiency production process for preparing xylose and L-arabinose and belongs to the field of application of wastes of agriculture and forestry. The production process comprises the following steps of: performing pretreatment on raw materials; hydrolyzing the raw materials in a high-temperature cooking mode; performing neutralizing treatment and performing centrifugal separation on solid slag to obtain xylose or xylooligosaccharide hydrolyzate; adding coarse enzyme solution into xylooligosaccharide solution to hydrolyze to obtain xylose solution; treating the hydrolyzate by Angle yeast; purifying by using active carbon and resin; performing recompression and concentration treatment on the purified hydrolyzate by using a mechanical vapor recompression (MVR) machine; crystallizing the concentrated solution in a gradient program cooling mode to obtain xylose products and xylose mother solution; separating the xylose mother solution by a simulated moving bed or a chromatographic separation technology to obtain a xylose phase and an L-arabinose phase; returning the xylose phase to the xylose solution to concentrate and recrystallize; reusing the xylose mother solution; performing MOVR concentration treatment on the L-arabinose phase and crystallizing in a gradient program cooling mode to obtain L-arabinose products; and reusing the L-arabinose mother solution.

The present invention provides processes for deconstructing and purifying biomass using water. The method includes the steps of loading a reactor with biomass and water, establishing and maintaining a deconstruction temperature and pressure for a deconstruction period, flushing the reactor with water, and repeating these steps to produce a solid phase and a biomass hydrolysate.

The invention belongs to the technical field of comprehensive utilization of subsidiary agricultural products, and relates to a method for preparing xylooligosaccharide and cellulose by using a crop straw acid hydrolysis method. The method for preparing the xylooligosaccharide by using the crop straws is used for preparing the xylooligosaccharide by four steps of pretreatment, acid hydrolysis, decoloration and desalination for hydrolysate and concentration drying; and a cellulose product can be obtained by performing alkaline treatment, stewing, pulping and drying on solid residues produced in a xylooligosaccharide preparation process. According to the method for preparing the xylooligosaccharide and the cellulose by using the crop straw, the crop straw is used as a raw material; the xylooligosaccharide and the cellulose are prepared by hot water pretreatment and acid hydrolysis by using the agricultural forest byproducts; the production technology is simple; the practicability is high; the economical value of the product is improved; the difficulty in utilization of the straw is well solved.

The invention discloses a method for the coproduction of xylose, lignin and ethanol from corncobs in the technical field of biochemical industry, comprising the following steps of: 1) hydrolyzing the corncobs under an acidic condition to obtain xylose solution and acidolysis residues; 2) performing alkaline liquor/alcohol extraction on the acidolysis residues to obtain lignin and lignin-free residues; 3) taking the lignin-free residues as an enzymolysis zymolyte, adding enzymolysis buffer solution, and performing enzymolysis using cellulase, thereby obtaining enzymolysis mixed solution; and 4) fermenting the enzymolysis mixed solution to produce ethanol solution. The method of coproduction of the invention comprehensively utilizes three components of the corncobs to obtain high value-added xylose and lignin products; and the cellulose content in the enzymolysis substrate is increased and the accessibility of the cellulase is improved, so that high transformation ratio of cellulose enzymolysis is realized. The method causes the utilization ratio of the lignocellulose raw material to be increased and the production cost of the cellulose ethanol to be reduced.

The invention discloses a method of increasing the extraction yield of trehalose, which belongs to sugar industry technical field. Adopting the techniques of hydrogenation and chromatographic resolution, the microorganism or enzyme are used for transforming the starch and the trehalose obtained undergoes the hydrogenation reaction with the mixing solution of the maltose, glucose and maltotriose; therefore the impurity in the mixing solution produces the maltitol, sorbierite and maltotriitol; the trehalose has no reducibility, and is stable in the hydrogenation reaction; and the trehalose is separated from the maltitol, sorbierite and maltotriitol in the mixing solution by the chromatographic resolution technique simulating the moving bed; and the purity and extraction yield of the trehalose are largely increased; the trehalose is crystallized by cooling, and the trehalose product is finally obtained. Compared with the technique of producing the trehalose by adopting the original microorganism or enzyme method, the technique of the invention increases the extraction yield over 80 percent, the sub product maltitol has a comparatively high utilization value; and therefore the production cost for producing the trehalose and the market price are reduced, which makes sense for increasing the market competition of trehalose.

The invention discloses a method for recycling of soybean whey wastewater by a membrane separation technology. The method includes: sterilization pretreatment; flocculation and centrifugal separation for impurity removal; whey protein recovery by ultrafiltration membrane continuous separation; whey protein powder recovery; oligosaccharide syrup recovery by nanofiltration membrane continuous concentration; oligosaccharide recovery; and dialysis water recovery by reverse osmosis membrane continuous concentration. The method provided in the invention can avoid whey wastewater rancidity and ultrafiltration membrane pollution and plugging, and improves the product quality. Employment of the continuous separation concentration mode reduces stay of intercepted objects or protein, impurity concentrated liquors in a membrane assembly to the utmost, and back-and-forth circulation between a membrane liquid inlet tank and a membrane system no longer exists. Meanwhile, the membrane surface flow speed is controlled, so that the problems of membrane pollution and low separation efficiency are solved. An osmosis filtration membrane washing process is adopted, and water is added automatically for filter wash, so that the membrane pollution and plugging problems are solved, and the product quality is improved. The selection of high temperature resistant hydrophilic membrane materials guarantee a high water flux and help to reduce membrane pollution.

The present invention relates to a chromatographic separation process for fractionating solutions containing sugars, sugar alcohols, sugar acids and/or betaine by utilizing fractions comprising parts of the separation profile as a substituent of the eluent in a novel and inventive manner. The starting solutions are typically multicomponent plant-based extracts and hydrolysates, stillages, and fermentation products and derivatives thereof. The process prow vides improved separation capacity and separation efficiency without affecting the yield or purity of product components, such as sugars, sugar alcohols, sugar acids, and betaine. The process can especially be applied to sequential SMB separation systems.

The present invention provides processes for deconstructing biomass using a solvent produced in a bioreforming reaction.

A method for coproducing xylose, white carbon black and active carbon from rice hulls comprises the following steps that: the rice hulls are washed and boiled by water, and the xylose is hydrolyzed by diluted acid; low-temperature carbonization is carried out, then, reaction with concentrated alkaline is taken to extract silicon dioxide, and the white carbon black is prepared by a coprecipitation method; and solid is added into liquor zinci chloride to be soaked for a certain time at a low temperature, then, high-temperature activation and acid washing are carried out, the materials are washed by water to the neutral state, and the materials are dried and ground to obtain active carbon. In the method provided by the invention, one line is adopted for coproducing the xylose, the white carbon black and the active carbon with high specific surface area in a branch way, the xylose preparation process for continuously hydrolyzing the hemicellulose in the rice hulls is adopted for the xylose, the xylose yield is improved, the method belongs to a simple and feasible xylose preparation process, the white carbon black is prepared by adopting an advanced chemical coprecipitation method, higher dispersing degree of the precipitation particles is maintained through adding surfactants into a solution system, and high-purity and ball-shaped white carbon black particles are prepared. The active carbon is activated by adopting the chemical activation method, the activation temperature is low, micro carbon crystals with small dimension can be favorably formed, and the active carbon with more developed porosity and better absorption performance can be obtained. The method provided by the invention has the advantages that the integrated and sufficient utilization of the rice hulls is realized, the maximum use of raw materials is realized, the integrated investment is low, the process technology is simple, and the industrialized production is easy to realize.

The invention relates to a process of recovering arabinose and optionally other monosaccharides from vegetable fiber rich in heteropolymeric arabinose, such as gum arabic. Said other monosaccharides are typically selected from galactose and rhamnose. The process of the invention comprises controlled hydrolysis of the arabinose-rich vegetable fiber and fractionation of the hydrolysis product to obtain a fraction enriched in arabinose and optionally other product fractions followed by crystallization of arabinose. The invention also relates to a novel method of crystallizing arabinose from biomass-derived material. Furthermore, the invention relates to novel crystalline L-arabinose.