59results about How to "Reduce the degree of hydrolysis" patented technology

The invention relates to a method for directly producing xylitol and arabinose by hemicellulose hydrolysate. Raw materials rich in arabinoxylans are hydrolyzed by acid or enzyme to obtain hydrolysate rich in the arabinose and xylose; and the hydrolysate is inoculated into yeast strains which can ferment the xylose and produce the xylitol and can not utilize the arabinose after detoxification treatment. When the xylose concentration in fermentation liquid is lowered to a certain extend, the fermentation is stopped. Ion-exchange desalinization, discoloration and proper concentration are carried out on the fermentation liquid, and chromatographic resolution is carried out on the arabinose- and xylitol-containing solution on calcium positive ions to respectively obtain xylitol solution with the purity of 99 percent and multi-sugar solution taking the arabinose as main ingredient, from which crystal xylitol and crystal arabinose can be respectively obtained by treatment. The method combines the production processes of the xylitol and the arabinose, thereby reducing the production cost and increasing the use ratio of resources.

A decoloring method of crude styrene obtained through extractive rectification of a pyrolysis gasoline C8 fraction includes the steps: sending crude styrene into a dehydration tower, carrying out rectification dehydration, separating out water from the tower top, adding a decoloring agent into dehydrated styrene obtained at the tower bottom, mixing, then sending into a styrene rectification tower, carrying out rectification, to obtain a styrene product at the tower top, and discharging a heavy component from the tower bottom. The method can make the platinum-cobalt chroma of the styrene product less than or equal to 10, allows the styrene product to reach product quality standard requirements, and can greatly reduce risks of equipment corrosion and sewage discharge capacity.

The invention relates to a method for preparing environment-friendly cigarette tows, which comprises the following steps of: drying and crystallizing, melting spinning, drafting and tension-finalizing, crimping, drying and thermal finalizing, wherein the drafting and tension-finalizing step employs a roller built-in heating way. The cigarette tows prepared by the method disclosed by the invention are higher in temperature of the crimping and the drying and thermal finalizing process steps in the preparation of the tows, shorter in production period, and improved in quality. And meanwhile, control of moisture can facilitate hot processing de-polymerization and hydrolysis degrees of polylactic acid, as a result, the spinning performance of the modified polylactic acid and the performance of tow products are improved.

A provided preparation method for wool keratin regenerated cellulose fiber comprises the concrete steps: firstly preparing a viscose-rayon spinning solution, then preparing a wool keratin solution, then mixing the viscose-rayon spinning solution and the wool keratin solution, then adding a crosslinking agent, mixing and performing wet-process spinning, so as to obtain wool keratin regenerated cellulose fiber. The wool keratin regenerated cellulose fiber prepared by employing the method has the protein content of 6% or more, and the production technology is simple in process and high in production efficiency.

The present invention discloses a method for preparing beta-lactam antibiotics by utilizing enzymatic synthesis process in organic solvent. Said method includes the following steps: mixing beta-lactam nuclear parent, acylation reagent and organic solvent, adding penicillin acylase, then making reaction for 1-36hr at -10-45deg.C, the concentration of penicillin acylase in reaction system is 30-300U IU/ml. Said invention, can greatly raise yield of beta-lactam antibiotics.

The invention discloses a dyeing method of a reactive dye with a high color fixation rate. The dyeing method comprises the following steps: S1, pretreatment: padding a texture to be dyed in a finishing solution containing chitosan quaternary ammonium salt, dipping for two times, rolling for two times, prebaking at the temperature of 80 to 100DEG C, baking at the temperature of 110 to 130DEG C, washing with cold water and then drying; S2, reactive dyeing: immersing into a dyeing solution of the reactive dye, dyeing at the temperature of 20 to 30DEG C, raising the temperature to be 50 to 70DEG C, then adding an organic solvent B, and raising the temperature to be 80 to 100DEG C; adding sodium carbonate according to the volume of the dyeing solution of the reactive dye, insulating heat and reducing to room temperature; S3, performing after treatment, water washing, soaping, water washing and drying in air. The dyeing method of the reactive dye with the high color fixation rate, provided by the invention, has the advantages of high color fixation rate and good level-dyeing property; in addition, the process is simple, and industrial implementation is easily realized; meanwhile, chemical substances with high price and greater toxicity are prevented from being used.

The invention discloses a preparation method for an AKD (Alkyl Ketene Dimer) emulsion and a water-resistant treatment method for paper sheets. The preparation method comprises the following steps of firstly, gelatinizing cationic starch, melting AKD wax powder at the temperature of 70 DEG C, then, pouring the gelatinized starch into the melted AKD wax powder, adding a stabilizer into the melted AKD wax powder, turning on an emulsifying machine to carry out emulsification, carrying out homogenization treatment on the solution, and carrying out rapid cooling, thereby obtaining the AKD emulsion. According to the preparation method for the AKD emulsion, disclosed by the invention, on the premise of guaranteeing the water resistance of the AKD emulsion, no starch etherifying process is carried out, and the gelatinized starch is directly used for emulsifying AKD after the starch is gelatinized, so that the equipment and labor investment of AKD emulsion manufacturers can be reduced, the aging efficiency of the AKD emulsion is high, the degree of hydrolysis of the AKD is greatly lowered, the water resisting effect is effectively guaranteed, and the economic benefit is obvious.

The invention discloses a waterproof luminous composite hydrogel material and a preparation method thereof. The hydrogel material is mainly prepared from the following raw materials in parts by weight: 70-90 parts of macromolecular monomer, 10-30 parts of inorganic substance coated luminous powder, 0.1-3 parts of crosslinking agent and 0.1-3 parts of initiator. The preparation method comprises the following steps: coating the surface of a long-afterglow luminous material with inorganic substances such as silicon dioxide and aluminum oxide; adding the inorganic substance coated luminous powder into the hydrophilic macromolecular monomer; then, adding the crosslinking agent and the initiator and mixing sufficiently; reacting and polymerizing at 65-80 DEG C to obtain waterproof luminous composite hydrogel. The hydrogel has the advantages of long luminescence time and good water absorption property.

The invention relates to the field of food and food processing, in particular to a method for extracting soybean isolate protein. The method comprises steps of primary extraction, separation, secondary extraction, separation, acid precipitation, neutralization, sterilization, drying and the like on degummed soybean meal. By adopting the method provided by the invention, growth and propagation of microorganisms in the production process of the soybean isolate protein can be effectively controlled, the taste of a product is improved, the hydrolysis degree of the protein is reduced, protein loss is reduced, and the production cost is lowered while the production yield is increased.

The invention discloses a chemical bath method for depositing an electrochromism membrane. The chemical bath method comprises the following steps: providing nickel sulfate and potassium persulfate, and preparing a precursor liquid of the nickel sulfate and the potassium persulfate; treating the prepared precursor liquid so as to increase the pH value of the precursor liquid; providing ammonium hydroxide, and mixing the treated precursor liquid with the ammonium hydroxide so as to obtain a mixed solution; providing FTO (fluorine-doped tin oxide) glass or ITO (indium tin oxide) glass to be plated, and soaking the FTO glass or the ITO glass to be plated into the mixed solution; taking out the plated FTO glass or the ITO glass, performing drying, and further wiping off nickel oxide deposited on the back side of the FTO glass or the ITO glass by using dilute sulfuric acid; and annealing the plated FTO glass or the ITO glass for 2-5 hours at 100-500 DEG C so as to obtain the FTO glass or theITO glass plated by the electrochromism membrane, wherein the electrochromism membrane is nickel oxide. By adopting the chemical bath method for depositing the electrochromism membrane, hydrolysis ofpersulfate can be inhibited, so that an oxygen source can be prevented from being consumed in an oxygen mode, and thus membrane deposition can be uniform and controllable.

The invention discloses a preparation method of low content 25-deacetyl rifamycin S. In a preparation process, the rifamycin S which is low in deacetylation S acid impurity (less than 1.0%), high in purity (higher than 97%), in the form of orange-yellow crystalline powder, and satisfies quality requirements of manufacturers at home and abroad is prepared by controlling key technical parameters such as feeding velocity of sulfuric acid, a rate of charge of materials to double solvents (alcohol and isopropanol), a pH value in a water-washing process and a cooling rate in a recrystallization process. The novel method has the advantages of being clear in control index, easy to operate, strong in controllability, high in yield and stable in product quality, and can be applied to mass preparation of the rifamycin S acid in a fermentation production process.

The invention relates to a method for preparing flax fiber by ultrasonic combination of a mucor circinelloides DK1 strain and hydrogen peroxide. The method comprises the following steps: (1) culturing the strain; (2) preparing a crude enzyme solution; and (3) mixing a flax raw material after sterilization and a mixed solution of the crude enzyme solution and hydrogen peroxide according to the mass-to-volume ratio of 1: (10-30), regulating a pH value, then putting into a shaking bed for treatment, finally adding sodium hydroxide, increasing the temperature, degumming, removing a degumming solution, washing, stopping washing when the pH value is natural, and completing degumming. The strain adopted by the invention is short in growth period, the strain is less liable to pollution, the treatment cost is low, and the degumming condition is mild; and the degumming method is simple in process flow, the time is shortened, the energy consumption is reduced, the pollution emission is reduced, and the method is conductive to environmental protection.

The invention provides an imipenem and cilastatin sodium pharmaceutical composition liposome injection, comprising imipenem, cilastatin sodium, sphingomyelin, cholesterol, an emulsifier and a cryoprotectant. The imipenem and cilastatin sodium injection prepared by using the method provided by the invention improves the quality of the preparation product, reduces toxic and adverse effects, increases bioavailability of medicinal components, and has good preparation stability. During the lyopilization process, liposomes do not break due to dehydration, fusion, ice crystals, and so on, and after hydration redissolution, liposomes also remain good encapsulation rate.

The invention discloses a papermaking wastewater treatment agent, which is prepared from a flocculating agent A, a flocculating agent B and a flocculating agent C, wherein the flocculating agent A isa modified bentonite solution with a mass content of 0.5%, the flocculating agent B is a polyaluminium chloride aqueous solution with a mass content of 3%, and the flocculating agent C is cationic polyacrylamide aqueous solution with a mass fraction of 0.1%, wherein the molecular weight of the cationic polyacrylamide is 8000000-12000000. The invention also discloses a use method of the papermakingwastewater treatment agent, wherein the use method comprises the following steps: adjusting the pH value of papermaking wastewater to 6-9, adding the flocculating agent A into the papermaking wastewater, quickly stirring, adding the flocculating agent B, slowly stirring until small micelle is generated, adding the flocculating agent C, slowly stirring to form large flocs, standing, separating theflocs in the circulating water, treating the papermaking wastewater, and feeding the treated papermaking wastewater into the next circulating treatment. The papermaking wastewater treatment agent islow in cost, simple in preparation and use process and good in treatment effect.

The invention mainly aims at solving the technical problems to improve the water solubility of an ivermectin drug and overcome the defect that the ivermectin drug is easy to degrade under an acidic condition, so that the dissolubility of the drug in bodies is improved; meanwhile, the aim that the drug is not damaged or is less damaged in acidic gastric juice is realized; and secondly, during a storage period of a preparation, acid/alkali catalytic degradation and oxidization degradation problems of active components are solved, and fewer effective components in the drug are degraded. An especially preferable preparation is prepared from the ivermectin drug, a polyoxyethylene hydrogenated castor oil condensation compound with the HLB value more than 12, Arabic gum or/and polyvinylpyrrolidone, benzyl benzoate or azone, 1,2-propylene glycol, corncob meal or/and beef powder, chicken liver powder and pork liver powder. The ivermectin drug, the polyoxyethylene hydrogenated castor oil condensation compound, the Arabic gum or/and the polyvinylpyrrolidone, the benzyl benzoate or the azone and the1,2-propylene glycol exist in a preparation in a form of a self-emulsifying solid dispersion body drug releasing system.

The invention relates to the technical field of probiotic mediums, especially to a probiotics medium and a culture method and application thereof. When the probiotics medium is a liquid medium, each 1L of the medium contains 10-12 g of lactalbumin hydrolysate, 5-6 g of yeast powder, 10-12 g of proteose peptone, 10-12 g of glucose, 3-5 g of sodium chloride, 180-200 ml of tomato juice, 1-2 ml of microscale salting liquid, and the rest of distilled water. When the probiotics medium is a solid medium, the medium also comprises 18-20 g of agar. The invention has the following beneficial effects: carbon nitrogen ratio is complete; vitamins and trace elements are complete; by the use of the medium, all probiotics can grow well; cost of the medium is low; operation is convenient; the medium is suitable for mass production; and problems existing in the prior art can be solved economically and effectively.

The invention relates to an ionic liquid-based ECF bleaching protection agent for paper pulp. The ionic liquid-based bleaching protection agent is adopted to pretreat eucalyptus sulfate slurry, and then ECF bleaching is performed, wherein the addition amount of the bleaching protection agent is 5%-15% of the paper pulp. Though treatment, lignin in fiber can be dissolved effectively, and a protective layer on the surface of the fiber is formed by the lignin, so that the efficiency of subsequent bleaching is improved, and the fiber is protected in the bleaching process. Through the pretreatment,the content of cellulose in the pulp can be increased, the content of the lignin is reduced at the same time, and the physical strength of finished paper is improved, so that the application range ofeucalyptus and other broad-leaved wood is widened; and through the treatment, the bleaching effect is improved, the amount of a bleaching agent is reduced, the bleaching efficiency is improved, and pollution is reduced. The ionic liquid-based ECF bleaching protection agent has the advantages of simple operation, an obvious effect, high practicability, small pollution and easy popularization.

The invention relates to high-efficiency denitration ionic liquid, which belongs to the technical field of smoke treatment. The high-efficiency denitration ionic liquid comprises the following components: 15 to 30 parts of urea-based organic peptide, 60 to 80 parts of deionized water, 5 to 10 parts of catalyst, 1 to 5 parts of stabilizers, and 1 to 5 parts of regulator. The components are added into a high-speed dispersion device to be dispersed at a high speed, and the stable high-efficiency denitration ionic liquid can be formed by virtue of the dispersion and reaction. An application methodof the high-efficiency denitration ionic liquid comprises the following steps: spraying the prepared ionic liquid into a denitration reactor by using a spray gun, wherein the application temperatureis 450 to 1250 DEG C. According to the high-efficiency denitration ionic liquid and the application method thereof, the high-efficiency denitration ionic liquid is colorless, tasteless and non-corrosive liquid, is safe in transportation and storage, convenient and simple to use, free from secondary pollution, wide in operating temperature range, and capable of being operated at 450 to 1250 DEG C;the method does not cause any crystallization and blockage when in operation; and after the product is put into the high temperature area, the smoke sufficiently contacts the denitration ionic liquid,so that the reduction time of the liquid catalyst and the smoke can be increased, and the escaping can be avoided.

The invention discloses an acylation modification method of hungtintin. The acylation modification method is characterized by comprising the following steps: (1) obtaining a recombinant protein Htt(1-90), to be specific, a. obtaining a hungtintin gene, b. constructing a recombinant expression plasmid pTWIN1-htt, c. constructing a recombinant escherichia coli strain DH5 alpha-htt for expressing the hungtintin, and d. expressing the recombinant protein; (2) purifying the recombinant protein Htt(1-90); (3) obtaining an acylation modified Htt(Cys-K92-K158) polypeptide by using an SPPS (stable protein plasma solution) method; (4) purifying the Htt(Cys-K92-K158) polypeptide; (5) coupling the Htt(Cys-K92-K158) polypeptide with the recombinant protein Htt (1-90) so as to obtain an acylation modified target protein Htt(1-158); (6) purifying the acylation modified target protein Htt(1-158). Through the acylation chemical modification on the hungtintin, the hydrolysis degree of the hungtintin subjected to the acylation treatment is relatively small, and the hydrolysis degree of the non-acetylized hungtintin is relatively high, which shows that the hungtintin subjected to the acylation modification has relatively strong stability.

The invention relates to the technical field of artificial leather, in particular to a preparation method of microfiber leather and the microfiber leather. The method comprises the following steps: mixing island component raw materials and additives according to a preset proportion to obtain mixed raw materials; carrying out melt spinning on the mixed raw materials to obtain superfine fibers; carrying out molding treatment on the superfine fibers to obtain superfine fiber base cloth; dipping the base cloth in waterborne polyurethane to obtain fabric to be split; and carrying out splitting treatment on the fabric to be split to obtain the microfiber leather; wherein the additives can reduce the conditions of the splitting treatment and reduce the hydrolysis degree of the waterborne polyurethane in a splitting treatment process. According to the microfiber leather and the preparation method thereof, the additives are added during preparation of the ultrafine fibers, so that by using theultrafine fiber base cloth prepared from the ultrafine fibers, when in subsequent splitting treatment,the splitting treatment conditions can be reduced, then the hydrolysis degree of the aqueous polyurethane during the splitting treatment process can be reduced, and thus the finally prepared microfiber leather has good quality performance.