32results about How to "The process conditions are mature" patented technology

A process for separating and purifying the high-purity oligose includes treating the resin HZ001 sequentially by acid, alkali and salt solution, and using the treated resin to prepare high-purity oligose from low-purity one. The process for treating and regenerating resin HZ001 is also disclosed.

The invention relates to a production method of a powder coating curing agent, in particular to a production method of triglycidyl isocyanurate, belonging to the technical field of chemical production. The invention uses two kinds of catalysts, which effectively controls the occurrence of side reactions and greatly improves the product yield and quality; during distillation, the distillation temperature is reduced by increasing the vacuum degree, and the synthetic material is subjected to low-temperature cooling treatment to recover raw materials Epichlorohydrin reduces raw material consumption from 1.55 tons per ton to 1.3 tons. Overcoming the shortcomings of the old process, through mass production experiments, it is concluded that the process conditions are mature and feasible, the conversion rate is high, the product quality is stable, the finished product rate is over 80%, and the consumption of raw materials is small, so it has a broad market prospect.

The invention relates to a method for producing catalytic reformed feedstock by taking light and medium gasoline distillates as raw materials and extracting selective solvent to extract and rectify catalytically cracked gasoline in the absence of hydrogen. The method comprises the following steps: 1, fractionation prefabrication of light and medium distillate raw materials of catalytically cracked gasoline; and 2, extraction, rectification, desulfuration and dearomatization of light and medium distillates of catalytically cracked gasoline, wherein light and medium distillates of catalyticallycracked gasoline obtained in step 1 are fed into the middle-lower part of an extraction-rectification tower, while fresh extraction agent or recycled extraction agent is added from the upper part of the extraction-rectification tower; thus, the light and medium distillates contact the extraction agent inside the tower to generate desulfurized and dearomatized light-component raffinate phase (i.e.catalytic reformed feedstock product) rich in olefin hydrocarbon at the top of the tower after extraction, rectification, desulfuration and dearomatization. The method carries out desulfuration and dearomatization of catalytically cracked gasoline at the same time and reclaims solvent, thereby having the advantages of simple process, moderate operation conditions, hydrogen source saving and low production cost.

The invention discloses a wooden floor based on carbon paper as a heating layer and a preparation method thereof, belonging to the technical field of decoration and heating. The invention adopts the papermaking wet forming technology to prepare the carbon fiber paper layer, and in addition, the polypyrrole is uniformly distributed on the carbon fiber paper layer by dipping and hot pressing technology to prepare a low-resistance heating layer, which can realize the function of low-voltage rapid heating, electrothermal conversion The highest efficiency can be as high as 98%; the heating layer has the characteristics of thinness, lightness and good uniformity, which makes the heat generation more uniform than other products made of carbon fiber, and the temperature uniformity is as high as 98%. The method of the invention is simple, green and environment-friendly, has mature technology, low cost, is beneficial to human health, and is suitable for industrialized production.

The present invention provides a kind of through SLS and ScFCO 2 Combined with the method for preparing polymer-based piezoelectric foam parts, the method is to use piezoelectric functional polymer powder or a mixed powder of piezoelectric functional polymer powder and inorganic filler powder as the main raw material, through selective The laser sintering process is used to prepare laser sintered parts, and then the laser sintered parts are prepared by supercritical carbon dioxide autoclave pressure foaming method to obtain polymer-based foam parts, and finally polarized to obtain polymer-based piezoelectric foam parts. The method of the present invention limits the process parameters of the supercritical carbon dioxide autoclave pressure foaming method, and cooperates with selective laser sintering, and utilizes the special pore structure produced in the process of selective laser sintering to further improve the supercritical carbon dioxide autoclave pressure foaming process. CO during soaking 2 Diffusion, thereby significantly improving the piezoelectric properties and compressive modulus of the final polymer-based piezoelectric foam.

The invention discloses an iron-nickel-based high-temperature self-lubricating hot-working die material which comprises an alloy matrix, a solid lubricant and a hard phase, wherein an ingredient of the alloy matrix is iron-nickel-based alloy powder, and the alloy matrix is prepared by taking a GH2135 ingredient as the standard; the solid lubricant is CaF2; the hard phase is Cr2O3; three phases ofpowder of the alloy matrix, the solid lubricant and the hard phase are uniformly mixed by a ball mill, and then a hot-working die is prepared by a powder metallurgy method. The iron-nickel-based high-temperature self-lubricating hot-working die disclosed by the invention can implement self-lubrication under the condition of no oil or little oil, and meanwhile, is low in production cost.

The invention discloses a colon-targeted drug delivery soft capsule, which comprises Brucea javanica oil soft capsule and a polymer coating film, and the polymer coating film is a pH-sensitive enteric coating containing ethyl cellulose or cellulose acetate vegetarian ingredients. The present invention provides precise composition of the polymer coating film, realizes that the coated soft capsule does not disintegrate in the buffer solution of pH<7, but disintegrates in the buffer solution of pH>7, and achieves the ideal colon The requirements of localized drug release, the preparation method is simple, and the process conditions are mature, which makes up for the development and application of soft capsules that do not have colonic drug delivery in China.

The invention provides polyvinyl alcohol-based composite powder for selective laser sintering and a preparation method thereof. The composite powder comprises the following raw materials in parts by weight: 100 parts of polyvinyl alcohol resin, less than or equal to 40 parts of an inorganic filler, 10-60 parts of a plasticizing modifier and 0.1-0.5 part of a flow aid. The preparation method of thecomposite powder includes plasticizing and modifying the polyvinyl alcohol, and mixing with the inorganic filler to prepare the powder material suitable for selective laser sintering. The addition amount of the inorganic filler in the polyvinyl alcohol-based composite powder can reach 40 wt% of the addition amount of polyvinyl alcohol, the functionality of the high-addition-amount filler can be brought into full play, the sintering window is wide, the fluidity is good, and the polyvinyl alcohol-based composite powder is suitable for selective laser sintering 3D printing processing.

The invention discloses a polyconjugated diene / SBS composite rubber particle and a preparation method thereof and application of the composite rubber particle in modified asphalt. The preparation method of the polyconjugated diene / SBS composite rubber particle comprises the following steps: uniformly mixing a polyconjugated dieneglue solution and a SBS glue solution, and carrying out coagulation, expansion drying and granulation to obtain the composite rubber particle. The composite rubber particle will not cold-flow and is non-sticky at room temperature, shows good autohension under the action of rubber oil, is used for modified asphalt materials, and shows low low-temperature performance, excellent processability and good physical properties. In addition, the preparation method of the composite rubber particle is simple, cost is low, process conditions are mature, especially there is no dust pollution, and the method is beneficial to industrial production.

The invention discloses a method for preparing D-xylose and L-arabinose by recycling phosphoric acid. With bagasse, bagasse pith or sugarcane tops as raw materials, the D-xylose and the L-arabinose are prepared by hydrolyzing the raw materials, precipitating phosphate radicals of hydrolysate and purifying; and with combination of a cane sugar manufacture process, after being subjected to acid dissolution treatment, phosphate radical precipitates are added into cane juice as a processing aid, which is obliged to be used in the cane sugar manufacture process, for recycling. The method disclosed by the invention is good for environment protection and recycling in the cane sugar manufacture industry, and compared with an xylose production method adopting sulfuric acid or hydrochloric acid at present, the method has the advantages of no hydrolytic acid pollution, simplicity and convenience in process operation, high yield of the D-xylose and L-arabinose, and low cost, and is suitable for industrial production and good for solving the problem of bottleneck restriction of environment pollution in xylose production.