55results about How to "Meet raw material requirements" patented technology

The invention discloses a novel edible antibacterial food packaging film and a preparation method thereof. The novel edible antibacterial food packaging film is prepared from chitosan, gelatin and cinnamon essential oil. The preparation process is simple, and the preparation method only comprises the following steps: respectively preparing a chitosan solution and a gelatin solution, respectively adding glycerin plasticizing agents for mixing, adding a natural antibacterial agent cinnamon essential oil, emulsifying, fully dispersing the emulsion, performing film casting, thereby obtaining the product. The obtained food packaging film has excellent tensile strength (TS is equal to 42.17+/-1.84MPa) and ductility (EAB is equal to 62.34+/-2.66%), has obvious effects of inhibiting common spoilage microorganisms such as Escherichia coli and staphylococcus aureus in foods higher than those of PE preservative films in the market, is suitable for packaging various foods and meets the market requirements.

The invention discloses a preparation method of composite fiber of cellulose nanometer fibrils/alginate. The method includes steps of evenly dispersing cellulose nanometer fibrils under ultrasound wave function, and preparing aqueous suspension; then evenly mixing with alginate solution and obtaining the mixed solution of cellulose/ sodium alga acid as spinning raw liquid; spinning by wet method and obtaining the composite fiber of cellulose nanometer fibrils/alginate. The preparation method is simple and easy to operate, the technique is green and environmental-friendly; the prepared composite fiber of cellulose nanometer fibrils/alginate is an environment-friendly recycled material, and has the same excellent biocompatibility and biological degradability as the pure alginate fiber; the oriental controllability of cellulose nanometer fibrils is enhanced, and the cellulose nanometer fibrils and the base alginate are formed to be an interpenetrating polymer network structure, thereby effectively improving the intensity and flexibility of composite fiber and greatly improving the adaptation of alginate fiber in textile and garment and medical treatment health domain.

The invention discloses a process for screening and refining wheat starch. The process comprises the following steps: screening starch slurry material by a 250-mesh primary centrifugal screen at the rotation speed of 900r/min, screening oversize materials by a 200-mesh secondary centrifugal screen at a rotation speed of 900r/min, collecting the undersized materials screened out by the primary and the secondary centrifugal screen and feeding into a primary horizontal-spiral decanter centrifuge for separation treatment, wherein obtained light-phase substances such as soluble proteins and sugar can be treated in other ways, the obtained starch phase is concentrated by a secondary horizontal-spiral decanter centrifuge to obtain the finished starch slurry; and drying the finished starch slurry to obtain the standard finished starch product. Compared with the prior art, the process has the advantages of simple technology and reduction of energy consumption due to the use of the horizontal-spiral decanter centrifuge instead of the cyclone separator unit used in the conventional processes.

The invention discloses a method for comprehensively recover aluminum, silicon and titanium from pyrite tailings. The method comprises the following steps: performing oxidizing roasting on the pyrite flotation tailings, adding a sodium hydroxide solution to stir and dissolve out silica in roasted tailings, performing solid-liquid separation to obtain a solid product and a liquid product, wherein the solid product is aluminum oxide concentrate and the liquid product is a solution containing silica and alkali; using the aluminum oxide concentrate as the raw material and adopting the Bayer process to extract aluminum oxide, purifying the Bayer process white clay to prepare a material with rich titanium; adding active quick lime in the solution containing silica and alkali to control the synthesis reaction of sodium silicate and calcium oxide and generate calcium silicate hydrate whisker, regenerating the sodium hydroxide solution; and sending the regenerated caustic alkali solution back to leach the new roasted tailings. By adopting the method, the step separation and concentration and value-added processing of aluminum, silicon and titanium in the pyrite resource can be realized, the problem that the solid waste of the tailings is stocked to occupy the land, pollute the environment and cuase potential public safety hazards can be solved and the economic, social and environmentalbenefits are great; and a new method is provided to realize no-waste mining.

The invention discloses a method for separating and preparing hydroxytyrosol from olive fruit water. According to the method, a great deal of waste fruit water generated while olive oil is squeezed from olive fruit is adopted as a raw material, and a hydroxytyrosol extract is prepared by using integral techniques such as centrifugation, extraction, low-temperature concentration and drying. Strong acid or alkali and high temperature are not involved in the whole production process, and enrichment and purification are implemented without chemical materials, so that the hydroxytyrosol extract can meet security requirements of food, healthcare food and special medicinal food raw materials, the purity of hydroxytyrosol of the extract is 20-50%, and thus requirements of different products can be met. The method is efficient, energy-saving, environmentally friendly, convenient, easy to industrialize and low in operation cost.

The invention provides a preparation method of a polythiol compound for optical resin. The preparation method comprises the following steps: a), carrying out polyalcoholation reaction on mercaptoethanol and epoxy chloropropane in an alkaline solution to obtain a reaction mixture containing a polyalcohol compound; b), carrying out thiolation reaction on the reaction mixture containing the polyalcohol compound obtained in the step a) and thiourea in an acid solution to obtain a reaction mixture containing a polythiol compound; and c), carrying out hydrolysis reaction on the reaction mixture containing the polythiol compound obtained in the step b), and then washing and drying to obtain the polythiol compound for the optical resin, wherein the iron content of the mercaptoethanol is greater than 0 and less than 10 ppm and the iron content of the epoxy chloropropane is greater than 0 less than 10 ppm. According to the preparation method disclosed by the invention, by strictly controlling the iron content of raw materials, the polythiol compound with relatively low chroma is obtained by a specific preparation technology, and thereby the requirements on the raw materials for preparing an optical resin lens with excellent performance can be satisfied.

The invention provides a tetramethylbiphenyl preparation method which comprises the coupling reaction of halogenated aromatic hydrocarbon and the extraction of the product, wherein the reactants of the coupling reaction comprises alcohol used as reducing agent, palladium carbon used as catalyst and alkaline water solution used as solvent. The invention also comprises the recrystallization by usingmethanol so as to prepare high purity tetramethylbiphenyl. The invention provides the simple and economic preparation method of tetramethylbiphenyl industrialized production with low demands for thedevice and technology and the prepared tetramethylbiphenyl has higher purity and meets the demands of the raw material used to prepare high performance polyimide.

The invention relates to a method for preparing aluminum oxide through hydrochloric acid leaching and two-stage electrolysis of bauxite and comprehensively utilizing aluminum oxide. The method comprises the following steps: carrying out hydrochloric acid leaching, solid-liquid separation and purification on bauxite on bauxite, so as to obtain an iron chloride mixed solution and an aluminum chloride mixed solution; respectively separating and purifying the iron chloride mixed solution and the aluminum chloride mixed solution, so as to obtain scandium chloride, gallium chloride, an aluminum chloride water solution and an iron chloride water solution; setting electrolytic voltage and current density, and respectively carrying out two-stage electrolysis on the aluminum chloride water solution and the iron chloride water solution, so as to respectively obtain aluminum hydroxide, hydrogen and chlorine as well as iron hydroxide, hydrogen and chlorine; preparing a hydrochloric acid solution by using the generated hydrogen and chlorine, and returning the hydrochloric acid solution to a leaching stage for recycling; and roasting aluminum hydroxide, so as to obtain metallurgy level aluminum oxide or chemical aluminum oxide. Compared with a traditional acid method, the electrolysis method for recycling aluminum oxide in the bauxite and processing the bauxite has the advantages that the evaporation step and equipment, the concentration step and equipment are omitted, the operation is simplified, meanwhile, the cost is substantially lowered, and the product has relatively high purity.

The invention relates to a process for synthesizing p-tert-butylbenzoic acid. The process comprises the following steps of: adding p-tert-butyltoluene and cobalt acetate into a reaction kettle, introducing oxygen-containing gas, triggering at the temperature of between 150 and 155 DEG C, performing oxidation reaction for 0.5 to 1 hour, and continuously reacting at the temperature of between 135 and 145 DEG C for more than 5 hours to obtain a p-tert-butylbenzoic acid crude product; cooling the p-tert-butylbenzoic acid crude product to crystallize, performing centrifuge dripping, and striking and washing by using p-tert-butyltoluene to obtain a centrifugation crude product; and adding the centrifugation crude product into a dissolution kettle, adding methylbenzene, raising temperature and dissolving, filtering when a mixture is hot to remove impurities, adding water to wash, transferring materials to a recrystallization kettle, cooling to crystallize, centrifuging, striking and washing by using methylbenzene, and drying to obtain a p-tert-butylbenzoic acid finished product. The prepared p-tert-butylbenzoic acid is white crystals and does not contain mechanical impurities; and the melting point is 164.0 to 167.0 DEG C, the acid value is 312 to 316mgKOH/g, high performance liquid chromatography (HPLC) purity is more than or equal to 99.2 percent, moisture is less than or equal to 0.08 percent, and methylbenzene is less than or equal to 0.05 percent.

The invention discloses a method for preparing high-efficiency modified asphalt, which is performed according to the following steps: (1) adding the asphalt, a modifier and an oxidizer into a reaction kettle according to a weight ratio of 100:(1-15):(1-15), heating the reaction kettle to 200 to 300 DEG C, and preparing molten asphalt; (2) adding the prepared molten asphalt into an atomization conditioning tower, and performing the atomization conditioning of the molten asphalt for 2 to 6 hours; (3) adding the atomization-conditioned molten asphalt into an emulsifying device at 250 to 400 DEG C, and adding an emulsifier to perform emulsification conditioning; and (4) cooling to 170 to 200 DEG C and discharging to obtain high-efficiency asphalt. In the invention, the atomization technique improves the carbon content of the asphalt, and the emulsification technique makes the asphalt easily flowable and uniform, the preparation process is simple and quick, the softening point of the product is low, and the comprehensive cost of the product is low.

The invention relates to a method for recovering and recycling chlorosilane slag slurry and belongs to the technical field of chlorosilane recovery and recycling. The method comprises conveying chlorosilane slag slurry into a solid-liquid separation device, carrying out solid-liquid separation to obtain a liquid phase material and chlorosilane slag slurry, feeding the chlorosilane slag slurry intoa washing device, washing the chlorosilane slag slurry through a hydroxyl-containing solvent and/or a stabilizer to obtain a liquid phase material and a solid phase material, and recovering chlorosilane in the liquid phase materials collected through two processes. According to the method for recovering and recycling chlorosilane slag slurry, the materials participating in a reaction are pure, areaction speed, side reactions and a desired product conversion rate can be effectively controlled, the desired product has high purity, the by-products are less and the disposal and environmental costs of the by-products are greatly reduced.

The invention discloses a coal tar hydrogenation process which comprises the following steps: (1), carrying out distillation onto the coal tar; (2), carrying out hydrogenation treatment onto distilled heavy distillate oil; (3), carrying out gas-liquid separation onto the hydrogenated product; (4), feeding a liquid-phase material obtained by gas-liquid separation into a first separator, and feeding a vapor-phase material into a low-temperature separator; (5), mixing heavy residual oil obtained through separation of the first separator, a liquid-phase separated out by a low-temperature separator and light distillate oil, and then feeding into a second separator; (6), mixing light oil obtained by the first separator and the second separator and then filtering, and distilling the filtrate to obtain light oil, medium-weight oil and heavy oil; and (7), feeding the heavy oil into a delayed coking system to produce needle cokes and circulation oil, feeding the circulation oil into a slurry-bed reactor, and carrying out hydrorefining onto the light oil and the medium-weight oil to obtain petroleum and aviation kerosene. According to the coal tar hydrogenation process disclosed by the invention, the coal tar hydrogenation and residual oil extraction are combined together, so that utilization rate of active ingredients in the heavy residues and gas-oil recovery rate of the coal tar are increased.

The invention provides a preparation method of biomass-based polyether polyol, and belongs to the technical fields of chemical new materials and high-quality utilization of biomass. Starch liquefaction products, straw powder and a dispersing agent are used as raw materials, a solvothermal reaction is catalyzed to prepare polyether polyol, and under a proper liquefaction reaction condition, the liquefaction rate of straws reaches 65% at most. The hydroxyl value of the obtained polyether polyol is 426.0 mg KOH/g, and the viscosity of the obtained polyether polyol is 430.5 mPa.s. The method is simple in equipment and operation and wide in raw material source, and the obtained polyether polyol is suitable for being used as a raw material for preparing an environment-friendly rigid polyurethanethermal insulation material.

The invention relates to a hydrometallurgy method for treating low-grade laterite-nickel ore through normal pressure and pressurization combined acid leaching. The method comprises the following stepsthat transition ore pulp is prepared, the heated transition ore pulp and heated concentrated sulfuric acid are mixed according to a certain proportion, an acid leaching reaction is generated, and after water solution, normal-pressure leaching residues and normal-pressure lixivium are obtained through solid-liquid separation; limonite pulp is prepared, after the limonite pulp and the normal-pressure lixivium are mixed, heating is carried out, pressurization leaching is carried out under the conditions that the pressure ranges from 2.0 MPa to 4.0 MPa and the temperature ranges from 220 DEG C to240 DEG C, and after cooling, pressurization leaching residues and pressurization lixivium are obtained through solid-liquid separation; and briquetting and sintering processes are carried out on pressurization leaching residues to form iron powder. According to the hydrometallurgy method, acid consumption is low, the leaching rate of NiCoFe is high, the needed equipment cost is low, silicon andiron can be effectively separated, and iron concentrates high in iron content are obtained.

The invention provides a Fischer-Tropsch synthesis system which comprises a rectification unit, wherein the rectification unit comprises a first heating furnace, a rectification tower, a first diesel oil stripper, a first diesel oil pump, a first overhead condenser, a first overhead reflux tank, a first reflux pump and a first naphtha pump. The invention also provides a method for Fischer-Tropsch synthesis by utilizing the Fischer-Tropsch synthesis system. The Fischer-Tropsch synthesis system provided by the invention can be obtained only by transforming a small part on a basis of the existing device, and therefore, the investment is less, and the cost is low; and the invention provides the novel method for obtaining diesel oil by Fischer-Tropsch synthesis, and fractions can be segmented only by adjusting technological parameters, and therefore, the cost is lowered, the yield of naphtha is increased, and the additional value of the diesel oil obtained by Fischer-Tropsch synthesis is increased.

The invention belongs to the field of microbial soil conditioners, and particularly relates to a method for preparing an agricultural microbial soil conditioner through solid fermentation of industrial and agricultural wastes. According to the method provided by the invention, industrial and agricultural wastes are used as main raw materials, and bacillus subtilis is used for solid fermentation toprepare the agricultural microbial soil conditioner. The invention provides the solid fermentation method of the soil conditioner; by using low-price organic wastes as raw materials, the production cost is far lower than that of a liquid fermentation inoculant and is about 3-5 times lower than that of the liquid fermentation inoculant, and the product has high viable bacteria content which is more than 5 billion/g and up to 10 billion/g, and completely meets the requirements of raw materials for processing the soil conditioner. In the production process, organic materials are properly decomposed through microbial culture, decomposition of macromolecular organic matters is accelerated, and meanwhile, multiple crop growth promoting components are secreted, so that the process is very suitable for processing requirements of products such as biological soil conditioners, biological organic fertilizers and the like.

The invention discloses a method for improving the metallization ratio and concentrate iron grade of a beach placer reduction product, and belongs to the field of comprehensive utilization of metallurgical resources. The method comprises the following steps: pre-oxidizing beach placer by adopting a rotary tube furnace; fully mixing the pre-oxidized beach placer with the biomass; carrying out reduction roasting on the mixture; and performing ore grinding-magnetic separation on the roasted product to obtain directly reduced iron powder. According to the method, the metallization ratio and the concentrate iron grade of the biomass reduced beach placer product are increased, the process is simple, the production cost is low, the method is environmentally friendly, and the method has great significance in relieving domestic iron ore shortage and achieving comprehensive utilization of beach placer and has good application prospects.