40results about How to "Moderate reaction time" patented technology

The invention relates to the technical field of monocrystalline silicon solar cells. A metal ion-assisted non-nitric acid polishing method comprises the following steps that S1, a polishing solution is prepared, specifically, 1.5 ml / L-5ml / L of a silver nitrate solution, 0.1%-5% of an organic acid, 0.5%-5% of ammonium bifluoride, 10%-40% of hydrogen peroxide and other components are sequentially dissolved into balance deionized water to be evenly mixed; s2, heating and polishing are conducted, specifically, the polishing solution obtained in the step S1 is heated to 55-70 DEG C, a monocrystalline textured wafer is placed in the polishing solution to be polished, and the polishing time is within 90-360 s; and S3, cleaning is performed, specifically, the monocrystalline textured wafer polished in the S2 is cleaned. The metal ion assisted non-nitric acid polishing method can solve the problems of low reflectivity, poor stability and high consumption at present.

The invention discloses a biodegradable gum base elastomer and a preparation method thereof, and belongs to the technical field of macromolecules. The elastomer is prepared by performing pre-polycondensation on aliphatic dibasic alcohol with the purity of over 99 percent, aliphatic saturated dibasic acid and a small amount of trifunctional glycerin at the temperature of between 160 and 180 DEG C for 2 to 4 hours in nitrogen atmosphere by a direct melt polycondensation method to generate a large amount of water, and gradually adjusting the vacuum degree to 100 to 2,000Pa at the temperature of between 190 and 220 DEG C within 0.5 to 2 hours until polymer climbs a pole and cannot be stirred. The product has low glass transition temperature, belongs to a gel / sol system, contains over 65 percent of sol, can be used as an environment-friendly gum base elastomer, and lays a solid foundation for producing biodegradable gum; and the process is simple and is convenient to operate, a catalyst isnot used, and the product is safe and non-toxic and has high yield.

The invention provides a bio-based degradable polyester resin and a preparation method thereof, and applies the bio-based degradable polyester resin to a bio-based degradable chewing gum base. The invention adopts the polycondensation of bio-based small molecule dibasic acid and bio-based small molecule diol which is safe and non-toxic and derived from renewable sources, and synthesizes bio-based degradable polyester with a glass transition temperature of 15-45°C. It can provide excellent elasticity and plasticity, and has a high degradation rate. It can be used as a degradable chewing gum base resin, which can not only ensure good performance of the chewing gum itself, but also has biodegradable characteristics.

The invention provides a method for preparing diethoxymagnesium, which comprises using metal spherical magnesium powder and absolute ethanol as raw materials, adding iodine simple substance and a cosolvent to prepare spherical diethoxymagnesium. The particle size range of the obtained spherical diethoxymagnesium is 1-200um, and the span of the particle size distribution is less than 3; by adding a co-solvent to the reaction system, the particle size of the obtained diethoxymagnesium can even reach 5um-15um, and Compared with the traditional method of adding surfactant, silicone oil or spar, the method is easier to remove the cosolvent, has no residue of impurities, and is more convenient for post-processing. The method of the present invention has lower reaction temperature, stable reaction and shorter reaction time. Short, no environmentally unfriendly substance discharge, suitable for large-scale industrial production.

The invention discloses imidazo-[1,2-c]-quinazolin-3(2H)-one fused-heterocycle compounds and a preparation method thereof, and discloses a preparation method of fused ring compounds (imidazo[1,2-c]quinazolin-3(2H)-one derivatives). The preparation method comprises the steps that 3 in a general formula is obtained by reacting at the proper temperature in the absence of a solvent or in a proper amount of the solvent under the action of amines 1 and 2 to generate a key intermediate and purifying; in addition, if R2 is -H, 3 can also be obtained by reacting 1 and DMF in the presence of benzene sulfonyl chloride and purifying, and the fused ring compounds represented by a formula are obtained by reacting 3 with 4 at the proper temperature in a proper amount of the solvent. The method has the beneficial effects that 1, the reaction path is short, namely a two-step synthetic method is adopted; 2, two heterocyclic rings are formed by adopting a one-pot method in the reaction of the second step; 3, raw materials are easily available and the operation is convenient; 4, no heavy metal ion catalysts and the like are used in the reaction and the reaction conditions are mild; 5, the reaction time is moderate, the control is easy, the post-treatment is simple, and the product purity and the yield are high; 6, the environment is not polluted and the green chemical concept is fully embodied.

The invention provides a petroleum fluid catalytic conversion control method. After being heated, raw oil enters a reactor and carries out catalytic conversion reaction after being mixed with recyclable catalyst which enters the reactor. The method is characterized in that the preheating temperature of the raw oil needs to be regulated when controlling the reaction temperature of the reactor. The control method overcomes the defects in the prior art, enhances the selectivity and the conversion rate of the fluid catalytic conversion reaction, improves the product distribution, enhances the yield of light distillate and has the characteristics of having reliable running and flexible regulation and saving energy and investment.

The invention discloses a 2,3,5-substituted imidazole[1,2-c]-thiophene[2,3-e]-7(8H)keto heterocyclic compound of which the structure is shown as a formula (I) shown in the description. The invention also discloses a preparation method of the compound and application of the compound in preparing antineoplastic drugs. The 2,3,5-substituted imidazole[1,2-c]-thiophene[2,3-e]-7(8H)keto heterocyclic compound provided by the invention adopts a two-step synthesis method, a one-pot reaction is adopted for forming two heterocyclic rings, the reaction material is easily obtained, the operation is convenient, the reaction condition is mild, the reaction time is moderate, the control is easy, the after-treatment is simple, the purity and yield of a product are high, and the compound and the synthetic method thereof have the advantages of being less in operation step, high in yield, free of reagents such as phosphorus, low in toxicity, convenient to operate and the like.

The invention relates to a water-in-oil type anionic polyacrylamide emulsion and a preparation method thereof. The method comprises the following steps: preparing a monomer solution for polymerization; mixing the monomer solution for polymerization, hydrocarbon solvent oil, a composite emulsifier, an initiator, a chain transfer agent and a complexing agent, and homogeneously emulsifying the obtained mixed solution , and then polymerized to obtain the water-in-oil type anionic polyacrylamide emulsion; the composite emulsifier is a mixture of Span emulsifiers, Tween emulsifiers, ether emulsifiers and instant emulsifiers; The instant emulsifier is selected from any one or more of alkyl amidopropyl dimethylamine, sodium lauryl sulfate, N-hexadecyl-N-ethylmorpholino ethyl sulfate. The fastest dissolution rate of the final emulsion in pure water can reach 10 seconds, and the viscosity loss rate of the simulated formation brine solution (compared with the pure aqueous solution of the same concentration) with a dissolution concentration of 1% and a total salinity of 20,000 mg / L is 40% ~58%.

The invention discloses a chemi-mechanical pulp manufacturing technology which includes the step of wood chip washing, the step of extruding and dipping, the step of pulp grinding, bleaching and pulp washing, the step of screening, purifying and regrinding of pulp residues, the step of pulp condensation and storage, the step of water circulating use and the step of chemical application and control. In the step of extruding and dipping, the extruding and dipping technology and an extruding and tearing device are used, heated and softened wood chips are evenly squashed in the texture direction, air in the wood chips and extracts affecting bleaching are discharged, it is ensured that the wood chips evenly absorb bleaching chemical liquid to be in a saturated state, fibers are promoted to be in the best moist and expanded state, and accordingly separation of the wood chips and fibrillation of the fibers are facilitated. The chemi-mechanical pulp manufacturing technology is wide in raw material application range and successfully combines the advantages that chemical pulp is high in strength and mechanical pulp is high in yield, produced bleached pulp can be used for newsprint, high-grade toilet paper, facial tissues, high-grade culture and printing paper, coating paper, light paper, white paper boards, food package paper and the like, and development prospects are wide.

The invention provides a method for catalytic conversion of heavy oil, which comprises a fluidized catalytic conversion process that: heavy hydrocarbon raw materials contacts a catalyst in a riser reactor or fluidized bed reactor to react; the reaction temperature is 400 to 650 DEG C (preferably 480 to 560 DEG C); the reaction pressure is 0.11 to 0.4MPa; the contact time is 0.05 to 5 seconds (preferably 0.1 to 3 seconds); and the weight ratio of the catalyst to the raw materials ( catalyst to oil ratio) generally is 3 to 15, preferably 5 to 12. The reaction products flow in a settler for catalyst and oil gas separation; the separated catalyst to be regenerated is stripped by a stripping section and enters a regenerator for coke burning regeneration; and the regenerated catalyst is cooled or directly returns to the riser reactor to be recycled. The method can solve the problems encountered in the resid-blend ratio improvement and gasoline upgrade and update processes of the prior catalytic conversion.