151results about How to "Reduce post-processing difficulty" patented technology

A catalyst for synthesizing vinyl acetate from acetylene and acetic acid is prepared from activated carbon, zinc acetate and alkaline bismuth carbonate in mass ratio of 100: (27-40): 0.026 by excessive solution dipping method.

The invention relates to a preparation method for flame retardant bisphenol A bi(diphenyl phosphate). The preparation method comprises the following steps: taking phosphorus oxychloride, bisphenol A and phenol as raw materials, adopting anhydrous zinc chloride or anhydrous aluminum chloride as a main catalyst, and adopting anhydrous calcium chloride or calcium phosphate as a promoter; adding the phosphorus oxychloride, the main catalyst and the promoter into a reactor for intensive stirring, when the materials are heated up to 73 to 78 DEG C, continuously adding bisphenol A, after the addition of bisphenol A is completed within 2.5 to 3 hours, heating up to and maintaining the temperature of 110 to 115 DEG C, and continuing the reaction for 1.5 to 2 hours; leaking out excessive phosphorus oxychloride under the normal and reduced pressure; and cooling down the intermediate product to 100 DEG C, continuous dropping phenol into the intermediate product, heating up to 140 DEG C 2 hours later, carrying out the reaction for 3 to 4 hours, monitoring the content of phenol through the liquid chromatography, and complementing phenol till the phenol content in the crude product is less than 0.5 percent. The yield reaches 98 percent; the content of triphenyl phosphate is less than 1.5 percent; and the acid number is 0.03mgKOH/g.

The invention discloses a method for preparing valganciclovir hydrochloride I. The method comprises the following steps of: 1, dissolving phosphorus oxychloride into an inert solvent, and performing a reaction of the mixture and the alcoholic liquor to obtain phosphoryl halide II; 2, performing a reaction of ganciclovir and the phosphoryl halide II obtained in the step to obtain ganciclovir monoester III; 3, esterfying the ganciclovir monoester III in the step 2 and N-carbobenzoxy-L-valine to obtain ganciclovir diester IV; 4, acidizing the ganciclovir diester IV in the step 3 for dephosphorylation to obtain N-carbobenzoxy-L-valine ganciclovir monoester V; and 5, performing a hydrogenation reaction on the product in the step 4 to prepare the valganciclovir hydrochloride I. By the method, the ganciclovir monoester with high purity and yield can be produced, the post-processing is easy, and the post-processing difficulty is reduced.

The invention relates to an auxiliary heating device and method for increasing the oil-gas recovery rate of oil shale in-situ mining, and belongs to the field of oil shale in-situ mining. The auxiliary heating device comprises an air compressor, a ground heat exchanger, a heating pipe, a temperature sensor, an automatic temperature control device, a gas pump, a staged condensing device, an oil-water separating device, a three-phase separator, a gas generator set, a combustible gas compressor and the like; and the heating pipe heats a heat injecting well section, the heating pipe and the groundheat exchanger jointly act to provide high-temperature gas for pyrolysis of an oil shale bed. The auxiliary heating method comprises the steps of early-stage preparation, a heating stage and an oil-production and gas-production stage. According to the auxiliary heating device and method, through a heating function of the heating pipe, on the one hand, the temperature of a production well is maintained within a certain range, and in-advance oil and gas condensation is effectively prevented; on the other hand, water in the product and a heating material react to release heat, and thus the watercontent in the product is effectively decreased; and combustible gas in the product is utilized to generate electricity to serve as an auxiliary power supply, and the cost expenditure is reduced.

A lithium battery lithium battery disclosed in the invention comprises a shell, a stab plate and a pressure limiting plate, the pressure limiting plate is arranged at the middle and upper portion in the shell, the stab plate is arranged in the shell below the pressure limiting plate, and the shell over the pressure limiting plate is provided with a gas vent. A technical problem to be solved in the invention is increasing the safety of the lithium battery. The lithium battery adopting the stab plate and the pressure limiting plate arranged in the shell allows the pressure limiting plate to be stabbed when the internal pressure is too high in order to release a gas, so the safety of the lithium battery is guaranteed, the damage of the shell of the lithium battery is effectively avoided, and the liquid leakage, the environmental corrosion and pollution and the like are prevented.

The invention relates to a copper-containing complex catalyst and a preparation method and application thereof. The preparation method comprises the following steps: adding water into copper carbonate, dripping perchloric acid to generate reaction, evaporating a blue solution after reaction is completed so as to be concentrated to obtain crystals, and finally obtaining copperperchlorate hydrate; adding the copperperchlorate hydrate and organic diamine into a solvent, stirring, performing heating backflow reaction under the temperature of 50-80 DEG C for 5-8 hours, and performing filtering, washing and drying to obtain a product. Compared with the prior art, the preparation method for the catalyst is simpler, and the catalysis activity is relatively high; pollution cannot be generated.

The present invention discloses a ketone oxime ester photoinitiator green synthetic method. According to the method, diphenyl sulfide as a raw material is condensed with caprylyl chloride under the effect of a zirconium catalyst, and then a ketone oxime ester photoinitiator can be obtained by oximation and esterification. The method does not relate to high temperature and high pressure reaction, and is mild in reaction conditions, and good in security. No aluminum chloride or zinc waste water is produced due to use of the zirconium catalyst during the synthesis process, produced byproducts can be recycled, no environmentally harmful solvent is used, and the ketone oxime ester photoinitiator green synthetic method is environmentally friendly, and therefore suitable for industrial production.

The invention discloses a variable cross-section opening grid supporting structure and a generation method thereof. Opening grid supporting units are formed by arraying a plurality of grid units in different sizes, and a plurality of opening grid supporting units are overlapped so that support units are formed for changing the support form; the side walls of the opening grid supporting units are provided with grid openings penetrating through the opening grid supporting units horizontally so that a lateral powder discharging channel is formed; thus, powder in supports can be cleared completelyafter forming, and recycled before heat treatment after forming of parts; the printing rate is increased, and the post-processing difficulty is reduced; a cross-section structure is formed through three-dimensional drawing software, and the supports are arrayed and arranged according to the requirements; the powder that can not be cleared from the interior of a traditional grid support is clearedcompletely, and the usage amount of the forming powder is reduced; the printing rate is higher through design of the grip supports with lateral powder discharge, and the forming time is shortened; and the efficiency is improved, and the cost is reduced.

The invention discloses a novel desulfurization method for calcination tail gas, belonging to the technical field of treatment of tail gas produced during titanium dioxide calcination. The novel desulfurization method comprises the following steps: (1) allowing tail gas at the tail of a calcination kiln to enter a spray tower, spraying the tail gas with waste sulfuric acid, directly pumping the waste sulfuric acid which is at the bottom of the tower after spraying to the top of the tower for recycling, and concentrating the waste sulfuric acid; (2) carrying out further spraying operation on the tail gas by using sand filter water, and washing away acid mist carried in the tail gas; and (3) building an alkali liquor cooling tower, subjecting liquid alkali cooled by the alkali liquor cooling tower to circular spraying, reducing the temperature of the tail gas, absorbing SO2 in the tail gas, reducing the temperature of the tail gas to 35 DEG C or below, and discharging the tail gas when the content of SO2 reaches the standard. Due to the adoption of tail gas desulfurization technology, the national policy of energy conservation and emission reduction in China is accorded with, and the survival of enterprises is guaranteed; and SO2 in calcination tail gas is annually saved about 540 t/year, so the surrounding living environment is greatly protected.

The invention provides a method for plating a metal layer by ionodialysis chemistry. An ionodialysis plating bath is provided; the plating bath comprises a main salt tank 1 and a traction tank 3; and the main salt tank 1 and the reaction tank 3 are separated by a cation exchange membrane 2. Main salt containing coating metal ions is dissolved in the main slat tank 1; an ionic reducing agent is dissolved in the reaction tank 3; and additive agents such as a coating metal ion complexing agent, a pH value buffer and the like are added in the reaction tank 3. The solution in the reaction tank is heated to the working temperature and the pH value is adjusted; and after being subjected to preplating such as surface washing and surface activation, a substrate to be plated is placed into the reaction tank so as to be plated.

The invention belongs to the technical field of nanofiber preparation, and discloses a method for preparing a fibroin nanofiber yarn with high degree of orientation by waste silks. The recycled wastesilks are utilized, regenerated silk fibroin protein is prepared, and then is dissolved in formic acid in a certain proportion to prepare a spinning solution, and a pure silk yarn containing highly oriented nanofibers is prepared. According to the method, the characteristics of wet spinning and electrospinning are combined, a yarn formed by entanglement and cohesion of multiple highly oriented nanofibers is directionally pulled out, and then is collected by heating, guiding and winding; the prepared yarn has excellent biocompatibility and biodegradability, the mechanical properties are good, and a great application prospect in guiding cell oriented production and transportation and transmission of biological factors is achieved; and the preparation method is simple and easy to control, thecost is low, the scientific concept of green sustainable development is conformed, and the value of large-scale industrial promotion is achieved.

The present invention relates to D-source peptide solid drink and belongs to the technical field of health-care drink. A technical scheme is as follows: the D-source peptide solid drink contains cardiomyopeptide powder, D-ribose, soybean peptide powder, nattos, enzymes, vitamin C, sea cucumber powder and collagen peptides. The D-source peptide solid drink can effectively nourish myocardium, prevents and cures various heart diseases, myocardial ischemia and thrombosis, also has effects on lifting and tightening skin, promoting intestinal peristalsis, and preventing and relieving constipation and diarrhea, and also has functions on nourishing bones and strengthening body.

The invention provides a method for preparing disodium 5'-ribonucleotide, which comprises the following steps of: preparing phosphoryl dihalide (II), reacting nucleoside with the phosphoryl dihalide (II) to obtain nucleoside phosphodiester (III), and performing R-radical substitution and salifying on the nucleoside phosphodiester (III) to obtain the disodium 5'-ribonucleotide (I). The method has the advantages of high conversion rate, a few byproducts, easy purification, easier impurity removal, reduction in postprocessing difficulty, and capability of preparing the disodium 5'-ribonucleotide with high purity and yield.

The invention relates to a catalyst for synthesizing diphenyl carbonate in phenol oxidative carbonylation as well as a preparation method and an application method of the catalyst. The catalyst comprises carrier rod-shaped nanometer CeO3 and an active component Pd compound, wherein the Pd compound is based on Pd, the weight ratio of the Pd to the CeO2 is 0.1: (10:100). The catalyst is used for synthesizing the diphenyl carbonate in the phenol oxidative carbonylation, solving the separation problem of a homogeneous Pd catalyst and overcoming the shortcomings that a conventional heterogeneous catalyst system is low in reaction rate and long in reaction time, and the like; meanwhile, by using the catalyst, the using amount of additives is reduced in the phenol oxidative carbonylation, only one additive is used, and the defects such as large using amount of the additives, multiple varieties, high difficulty in aftertreatment and high cost of a conventional reaction system are overcome. In addition, according to the method, the catalyst has relatively high activity all the time in the reaction process and can be repeatedly used.