337 results about "Hydrolytic Process" patented technology

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.

The invention discloses a method for preparing a molecularly imprinted TiO2/WO3 composite photocatalyst with visible light response through a direct method. The method is as follows: a titanium alkoxide is used as a sol and functional monomer precursor, an organic pollutant is used as a template molecule, absolute alcohol is used as a solvent, glacial acetic acid is used as an inhibitor, a sol-gel method is adopted, and the materials are prepared according to a certain ratio, wherein the molar ratio of the template molecule to Ti is 1:20-1:10, and the titanium alkoxide, absolute alcohol, glacial acetic acid and water are mixed in a volume ratio of 10:19:8:4. The method has the following technical effect: the titanium alkoxide has double functions, namely the titanium alkoxide can be used as a titanium source and can also be used as a functional monomer in the hydrolysis process. Other organic functional monomers are not required.

Corn cobs are important biomass resources. For a long time, the corn cobs have low chemical utilization ratio or cannot be utilized sufficiently to cause a great waste of resources. The invention develops a method for preparing ethylene glycol, propylene glycol and glycerine by carrying out catalytic hydrocracking conversion on the corn cobs, wherein the product is an important polyester synthetic chemical raw material. The corn cobs are efficiently converted into low carbon polyol products by the processes of acid-catalyzed hydrolysis, catalytic hydrogenation conversion and cracking. The yield of xylose in the hydrolytic process reaches over 30 percent; the conversion rate in the hydrogenation process reaches over 90 percent; and the selectivity in the hydrogenation process reaches over 90 percent.

The invention discloses a preparation method of mono-dispersion polysiloxane microspheres with controllable particle size. The preparation method comprises the following three specific steps: (1) hydrolytic process: adding a certain amount of acidic catalyst into de-ionized water, mechanically mixing uniformly to form an acidic aqueous solution with a certain pH (potential of hydrogen) value, adding siloxane monomers according to a ratio, reacting for a period of time while stirring with a certain rotation speed, to form silanol solution; (2) polycondensation process: adding alkaline solution into the reaction system obtained in the step (1) to adjust the pH value of the system, keeping a certain mechanical rotation speed under a normal temperature condition, stirring and reacting for a period of time; and (3) drying process: centrifugally separating the solution obtained in the step (2), washing by mixed solution of ethanol and de-ionized water, drying in a vacuum drying oven, so as to obtain the polysiloxane microspheres with certain particle size. The method disclosed by the invention is simple, heating and nitrogen protecting device are not required, a toxic solvent is not required, and the controllability of the particle size of the microspheres is realized.

The invention discloses a method for preparing nano cellulose by simultaneous assistance of ultrasonic waves and microwaves, belonging to the field of biomass nano materials. According to the nano material, liquid acid is taken as a catalyst, and the high-efficiency hydrolysis at the amorphous area of cellulose is promoted due to the simultaneous assistance of the ultrasonic waves and microwaves, so that the nano cellulose is rapidly prepared by plant fiber raw materials. The preparation method comprises the steps of acid hydrolysis of plant cellulose, centrifugal recovery of liquid acid and centrifugal separation of nano cellulose. According to the method, the mechanical dispersion action and ultrasonic cavitation effect of the ultrasonic waves, microwave uniform heating effect, catalytic action of the liquid acid and the synergistic effect of the ultrasonic waves and microwaves are utilized sufficiently, and the hydrolytic process of cellulose is enhanced, so that the high-efficiency and rapid preparation of the nano cellulose can be realized. The prepared nano cellulose material can be used for food additives, drug excipients, engineering material additives, specialty paper additives and the like.

The invention discloses a process for preparing furfural by using agricultural by-products of high and crude fiber plants. The process includes the steps of 1) conducting pretreatment of raw materials; 2) hydrolyzing pretreated raw materials in a hydrolyzing tank, and using an acid catalyst formed by mixing sulfuric acid and phosphoric acid during the hydrolytic process; 3) introducing high-temperature steam into the hydrolyzing tank, heating up the hydrolyzing tank, and conducting gap stripping for hydrolysis products of furfural; and 4) feeding gas stripped furfural to into a furfural phase splitter to obtain coarse furfural and furfural residues. According to the process, the acid catalyst combining the sulfuric acid and the phosphoric acid is used for hydrolyzing the raw materials, and the hydrolytic process is assisted by ultrasonic treatment simultaneously, so that the productivity of the furfural is improved, the residue amount of the sulfuric acid is a little, the production of sulfur oxides in the subsequent activating process of furfural residues is reduced, and the environmental pollution is reduced. Besides, the invention also provides a process for producing activated carbon adsorbents by using the furfural residues. The process includes the steps of drying the furfural residues, screening, roasting, hardening activating and steam curing, the obtained activated carbon specific surface is large, the iodine value is high and the adsorption capacity is high.

A medium-temperature carbon disulfide hydrolysis catalyst and its preparation method and application belong to a catalyst for removing organic sulfur in raw material gas, and the purpose is to solve the problem that CS2 is difficult to remove compared with COS in the catalytic hydrolysis of carbon disulfide. It is characterized in that by adding catalyst modifiers ZrO2 and La2O3, a catalyst with high CS2 hydrolysis catalytic rate, anti-coking and no conversion side reactions is obtained at medium temperature, and its preparation method is that the modifier and the activity accelerator are divided into two steps Loading is done by isometric impregnation. Under normal pressure, temperature 200-400°C, space velocity 2000-8000h-1, CO volume content 0-30%, CS2 concentration less than 500mgS/m3, the carbon disulfide hydrolysis conversion rate is above 95%. It is mainly developed for medium-temperature purification of carbon disulfide in industrial gases containing carbon monoxide, and has considerable application value, economic benefits and social benefits.

The invention relates to the health care food processing technology field, and concretely relates to an extraction method for astragalus polysacharin. In the method, polysacharin is extracted by utilization of low temperature liquid nitrogen crushing, non-ionic surface active agent auxiliary and plant compound enzyme enzymolysis. The method is advantaged by easily available raw materials, simple technology, and convenient operation and is suitable for large-scale industrial production. On the one side, the method decreases extraction times, raises yield and purity of the polysacharin, and lowers the production cost, on the other side, the method maintains the stabilization of structures and properties of the polysacharin, and raises trophism, safety and acceptability of the astragalus polysacharin greatly. In addition, the added non-ionic surface active agent is preferably polysorbate-80, polysorbate-80 has promotion effects on cellulase and pectase in hydrolytic process, and has solubilizing effects on the polysacharin at the same time. The pretreatment time and the extraction time are shortened, the time cost is lowered, and economic benefits of enterprises are raised.

In the invented method, citrus bioflavonoid and corresponding enzyme are used as raw materials, being dissolved in organic solvent, adding glucoside solution at concentration of 1-100g/L, under pH value of 3.0-7.0 and temperature of 20-65 deg.C for 20-60 min. After separation and purification, obtained is citrus bioflavonoid monoglycoside. With this invention, naringoside enzymolysis and cirmtim enzymolysis method for production of naringen in monoglycoside and hesperetin monoglycoside, compared with chemical method, has advantages of:easily to be controlled of enzymolysis, mild reaction, less by-products and easy to be separated of products. By using this invented method, the enzymolysis of naringoside and cirmtim for production of naringenin monocoside and hesperetin monoglycoside can be effectively controlled, and only the first glycosidic bond is broken, so obtained is highest yield of naringenin monoglycoside, hesperetin monoglycoside and rhamnose.

The invention relates to a sludge pyrohydrolysis method and a sludge pyrohydrolysis system, belongs to the field of treatment of a sewage plant, and particularly relates to the field of treatment of sludge of a sewage treatment product. To solve the problem that most of organic matters are not removed with an existing method, the invention provides the sludge pyrohydrolysis method and the sludge pyrohydrolysis system. The method comprises the processes of sludge slurrying, sludge pyrohydrolysis, sludge decompressed flash, sludge digestion, and centrifugal dewatering, wherein the process of sludge slurrying adopts a pump stirring mode, the temperature in a slurrying tank is kept at 97 DEG C; saturated steam heats a pyrohydrolysis tank to rapidly rise the temperature to be 165-190 DEG C in the process of sludge pyrohydrolysis, the pyrohydrolysis process lasts for 90 min, wherein the time for sludge charge is 15 min, the time for sludge discharge is 15 min, the steam is introduced for about 15 min, the pyrohydrolysis reaction is about 30 min, and the air is exhausted for 15 min; in the flash process, the pressure of a flash tank is kept at 0.1-0.3 MPa and the balance temperature is 102 DEG C; the time for sludge digestion is 15 days. The method and the system use the modes of pyrohydrolysis and flash, the organic matters in the sludge are effectively removed, meanwhile, the time for sludge digestion is shortened, and the sludge treatment efficiency is improved.

The invention discloses a method for preparing strong antioxidative peptide by using peanut meal. The method comprises the following steps of: (1) uniformly mixing the peanut meal and an acidic buffer, carrying out microwave heating, and placing in a powdering machine, thus obtaining powder peanut meal; (2) adding water, protease and cellulase, then adding a surface active agent, hydrolyzing at 45-60 DEG C, and carrying out centrifugal separation to obtain liquid supernatant which is peanut meal enzymatic hydrolysate; and (3) adding an ethanol solution to the peanut meal enzymatic hydrolysate, carrying out ultra-filtration, collecting trapped fluid, and carrying out spray drying to obtain the strong antioxidative peptide. According to the method, the peanut meal is pretreated by adopting microwave heating and the acidic buffer, so that disulfide bonds in peanut meal proteins are converted into sulfydryl bonds, more enzymolysis sites are exposed, and the enzymatic hydrolysis is facilitated. The surface active agent is used for cooperating with the enzymatic hydrolysis, changing the characteristics of an enzymolysis substrate, enlarging a surface on which celluloses can be adsorbed, and sequentially simulating reaction sites to be adsorbed on enzymes; and meanwhile, the surface active agent has stablizing effect on the enzymes, effectively stops the denaturation of enzymes in a hydrolytic process and is beneficial to the improvement of hydrolysis efficiency of the proteases.

The invention provides a method for preparing a cobalt-nickel double metal hydroxide nano composite through a hydrolytic process, belonging to the technical field of nano material preparation. The method is carried out under the condition of room temperature, dispenses with heating and temperature control devices and takes distilled water as a solvent, hydrolysis of sodium borohydride is utilized to provide an alkaline environment for reaction, the synthetic steps are simple, the yield is high and the obtained cobalt-nickel double metal hydroxide nano composite is a grapheme-like structure. The method is simple and energy-saving in preparation process and is suitable for industrial production. The obtained cobalt-nickel double metal hydroxide nano composite has good catalytic effects on hydrogenation of p-nitrophenol.

A method of forming a dielectric film on a Si substrate comprises the steps of adsorbing a gaseous molecular compound of a metal element constituting a dielectric material on a Si substrate, and causing a decomposition of the gaseous molecular compound thus adsorbed by a hydrolysis process or pyrolytic decomposition process or an oxidation process.

The invention discloses a pretreatment method capable of improving saccharification efficiency of lignocellulose. According to the method, ethanedioic acid, choline chloride and glycerol are added towater for reaction to obtain a modified deep-eutectic solvent (DES), and a lignocellulose raw material is pretreated with the modified DES. The method can realize pretreatment of the lignocellulose under a lower-temperature condition, is more beneficial to improvement of the saccharification efficiency of the lignocellulose and can substantially increase the total quantity of carbohydrates released in a lignocellulose hydrolytic process.

The present invention relates to polyester catalyst. The high-activity titanium catalyst is prepared through dissolving alcoholate of titanium in organic solvent, hydrolysis to obtain TiO2 deposit, washing and filtering, organically modifying TiO2 by setting the deposit in organic modifier solution to obtain modified TiO2. The catalyst is used in preparing saturated polyester resin with relative molecular weight smaller than 10,000 or thermoplastic polyester and copolyester with relative molecular weight greater than 10,000. The organic modifier modified TiO2 has high activity and no trouble of resulting in yellow polyester.

A harmless treatment method for secondary aluminum ash comprises the following five process steps: (1) preparing raw materials, namely preparing the secondary aluminum ash; (2) carrying out hydrolysis in a hydrolytic tank; (3) carrying out filter pressing by using a filter press and washing; (4) fixing fluorine by using calcium hydroxide; and (5) washing ammonia gas generated by reaction in a third-stage leaching tower. The method disclosed by the invention has the following advantages: firstly, aiming at the ammonia gas and hydrogen gas generated in a secondary aluminum ash hydrolysis process, a hydrolytic tank sealing form is adopted to prevent air from being mixed in, and a continuous feeding form and a continuous discharging form are adopted, so that explosion accidents of a large amount of ammonia gas and hydrogen gas generated instantly are effectively avoided, and the method is a safe and reliable recovery process; secondly, the whole technological process consumes less equipment, so that the energy consumption is low; the production cost of the method is lower than that of calcination, acid leaching and other processes, the product high-aluminum material, the by-product fluorite calcium fluoride and dilute ammonia water can be comprehensively utilized, and the economic benefit is high. The method is suitable for treating aluminum ash by-products in the electrolytic aluminum industry.

The invention relates to a new preparation method of strontium ranelate heptahydrate. The products produced by the method have water content of 19.0 per cent to 20.4 per cent and the relevant substances are lower than 0.5 per cent. The strontium ranelate heptahydrate produced by the method is stable under room temperature, has little water content differences between batches and is kept for a long time under natural environment with unchangeable moisture, content and relevant substances. The method is characterized in that: (1) the reflux of the 2-[N, N- 2(carboxymethyl)amino]-3-cyano-group-4-thiopheneacetic-5-carboxylic acid tetra ester (b) is carried out in the proper sodium hydroxide aqueous solution of alcohol for 5h to 6h and the pH value is kept over 10 during hydrolysis; (2) the ethanol of 20 per cent to 60 per cent is added and then the strontium chloride aqueous solution with 2times to 2.5times molal weight is directly added, precipitates the crystal, is filtered and dried; (3) water is added to carry out the reflux and the little salt packed in the crude product is removed, and the product is collected through heat filtration. The invention discloses the drug combination containing the strontium ranelate heptahydrate which is used for the treatment of osteoporosis of women after menopause.

The invention discloses a CaCu3Ti4O12 micro nano sized fiber and its preparation method, which belongs to the inorganic material technical field. The CaCu3Ti4O12 micro nano sized fiber comprises the elements of Ca, Cu, Ti and O with the mol ratio of 13412, and the diameter is 200-300 nanometers. The preparation method comprises the following steps mixing anhydrous ethyl alcohol, calcium nitrate tetrahydrate and copper acetate monohydrate to obtain a solution A; mixing anhydrous ethanol, butyl titanate and a spinning auxiliary agent to obtain a solution B; slowly adding the solution B in the solution A, and using a static spinning technology to prepare the CaCu3Ti4O12 micro nano sized fiber. The method of the invention can effectively control the hydrolysis process of the raw materials by selecting and adjusting the ratio of raw materials and the spinning auxiliary agent, the obtained static spinning solution possesses spinnability, and the method of the invention provides the novel CaCu3Ti4O12 micro nano sized fiber. The preparation method has the advantages of simple process, mild condition, easy control and wide applicability.

The invention discloses a method for doping an amino-reactive dye in silicon dioxide nano-particles, belonging to the technical field of flourescent material. The technique comprises the processes of an amino-modification for the surfaces of silicon dioxide nano-particles, a covalent coupling for a dye, and a coating for silicon dioxide shell layers. Silicon dioxide seed particles efficiently coupled with a dye on the surfaces thereof are obtained via a seed coupling method, then the seed particles are added in a pre-hydrolyzed system, and the coating for the silicon dioxide shell layers of the seed particles is realized via the rapid aggregation of oligomers and primary particles in the system on the surfaces of the seed particles. In the invention, an efficient coupling for a dye on the surfaces of silicon spheres is realized by separately carrying out the hydrolysis processes for TEOS (tetraethyl orthosilicate) and APS (ammonium persulfate), and the falling-off of the dye is reduced by means of rapidly coating silicon layers via a pre-hydrolysis, so that a purpose of efficiently doping an amino-reactive dye in silicon dioxide nano-particles is realized.

The invention belongs to the technical field of the production of titanium dioxide and in particular relates to a preparation method of hydrated titanium dioxide double-effect seed crystal. The preparation method comprises the following steps: adding sulfuric acid in metatitanic acid slurry to prepare titanium sulfate solution, using titanium sulfate solution and sodium carbonate to react and generate titanic acid, and using monoprotic acid to neutralize titanic acid and obtain the finished product. The hydrated titanium dioxide double-effect seed crystal can be a solid object with a certain water content or slurry of which concentration is less than 220g/L (calculated by TiO2). The rutile-type TiO2 content of the seed crystal is 5-95% of the total weight of TiO2 and the seed crystal also contains anatase TiO2 and amorphous TiO2. The seed crystal is added in the hydrolysis process of titanium-containing solution, wherein the weight percentage is 1-3% which is calculated by TiO2; and after hydrolysis, new rutile-type seed crystal is not required to be added in the calcining link.