50results about How to "Reduce the difficulty of process operation" patented technology

The invention relates to a method for liquifying coal mildly. The method mainly comprises steps of dry smashing coal samples and mixing with catalyst and hydrogen-donor solvent to form thick liquid; heating and then injecting into a reactor I, carrying out catalytic hydrogenation reaction on coal and hydrogen-donor solvent under mild condition, continuously dissolving out soluble components in products and coal; then injecting into a reactor II, flash distilling part of the product and solvent, rising temperature so as to split and coke left products to generate low boiling point compound and coke, wherein the coke can be used for preparing activated carbon and hydrogen. After the product which is vacuum flashed and purged through steam stripping is separated, different components are obtained, the component below 200 DEG C is condensed so as to obtain light oil, non-condensed gas and water, 200-300 DEG C component is condensed so as to obtain middle oil, after hydrotreating, the middle oil can be used as hydrogen-donor solvent, 300-500 DEG C component is condensed so as to obtain heavy oil which can be used for preparing chemicals or advanced carbon materials, and the component above 500 DEG C is condensed so as to obtain residual oil which can be used for preparing advanced carbon materials. The method has mild reaction conditions, the reactor is coupling, the efficient of the equipment is high, the yield of liquid product is high, the investment of the equipment is low, and the energy conversion efficiency is high.

The invention provides a preparation method for an isoxazoline-containing uracil compounds, belonging to the field of organic synthesis. The preparation method comprises the following steps: reactinga compound IV with an alkali in an organic solvent, then adding N,N-dimethylformyl chloride for a reaction so as to obtain a compound III and then reacting the compound III with a compound II in acidto obtain the target compound I. A reaction formula is as described in the specification. Each group in the formula is as described in the specification. The preparation method provided by the invention can avoid the use of expensive reagents or high-toxicity methylation reagents, effectively reduces cost and is easy for industrial production.

The invention relates to a chemical method for synthesizing ephedrine. In the technology, (+/-)alpha-methylaminophenylpropanone hydrochloride is taken as a raw material and reduced to the mixtures of (+/-)ephedrine and (+/-)pseudoephedrine by a proper reducing agent; the (+/-)ephedrine is separated, and the l-ephedrine or l-ephedrine hydrochloride is separated by using chiral organic acid as a resolving agent. The method enjoys simple technology, less equipment investment, less environment pollution, less hazardous and poisonous chemical reagents which are used and the like.

The invention provides a preparation method of a composite lithium salt concentrated solution. The method comprises the following steps of: putting lithium carbonate into an organic solvent in an inert atmosphere to obtain slurry, and introducing phosphorus pentafluoride gas into the slurry to react to obtain a composite lithium salt concentrated solution. According to the preparation method provided by the invention, the composite lithium salt concentrated solution containing lithium difluorophosphate and lithium hexafluorophosphate can be prepared by taking phosphorus pentafluoride and lithium carbonate as raw materials through a gas-solid reaction under a non-aqueous solvent condition and a one-step method, has the advantages of short process flow, no side reaction, high reaction efficiency, good product performance, high yield and no emission of three wastes, and is short in process production period and suitable for industrial production.

The invention discloses a method for producing ethanol through anaerobic fermentation of kitchen waste. The method comprises the following steps: carrying out sorting pretreatment on the collected andtransported kitchen waste; carrying out ultrasonic/alkali/H2O2 combined pretreatment on the sorted and oil-extracted kitchen waste to promote the hydrolysis process of the kitchen waste; and carryingout anaerobic fermentation on pretreated slurry, and conducting separating after fermentation to obtain the bioethanol. According to the method, the ethanol yield of the anaerobic fermentation of thekitchen waste is increased; and meanwhile, preparation process is simplified, and a technical method with higher feasibility is provided for recycling of the kitchen waste.

The invention discloses a full-automatic wire tension control rewinding machine. The machine comprises a bottom plate, wherein the bottom plate is provided with a wire pay-off device, the wire pay-offdevice is provided with a material wire coil in an inserting mode, and a material wire in the material wire coil winds around a positioning mechanism, a tension sensor mechanism, a speed measuring mechanism and a flat cable positioning mechanism in a sequential mode, and then wound on a wire take-up device. The wire take-up device, the tension sensor mechanism and the speed measuring mechanism ismatched with the wire pay-off device. The real-time tension of the wire material is detected through a tension sensor, thus transiting the data to a tension controller, and then the tension controller controls a real-time output torque of a magnetic powder brake, so that the wire pay-off tension can be stably controlled; in addition, by using the tension sensor and the magnetic powder brake, thetension, stress, straightness and flatness of the wire material can be realized; further more, with the tension sensor and the magnetic powder brake matched with the speed measuring mechanism, the arrangement of winding wire of the material wire coil is compact with the tension and stress being uniform, thus improving production efficiency as well as product quality, and the problems of messed wire, broken wire, pressed wire, over looseness of wire take-up, coil explosion and the like occurring during stop of turning and coil separation can be solved.

The invention discloses a method for efficiently dehalogenating waste plastics. The method comprises the following three steps: 1. quenching and tempering: adding an alkaline chemical raw material to the waste plastics, then adding a solution of a Ni<2+> chemical raw material/waste material and stirring and uniformly mixing the materials; 2. hydrothermal treatment: carrying out hydrothermal treatment on the prepared waste plastics at 200-240 DEG C for 10-60 minutes; 3. dehydration: carrying out solid-liquid separation on a mixture obtained after hydrothermal treatment, thus obtaining coke. The method has the beneficial effects that the function of Ni<2+> in plastic dehalogenation is confirmed for the first time; the method has the characteristics that the adding proportion of the alkaline chemical raw material is extremely small; the cost is low; the process is simple; the halogen removal efficiency is high; the reaction temperature is low; the time is short; the halogen containing rate of the waste plastics is reduced to about 0 from 56.8-74%; secondary pollution can not be caused; the plastics excluding halogen and some chemical raw materials after separation can be recycled, thus avoiding the problems of chlorine corrosion and dioxin pollution during halogen-containing plastic burning and providing beneficial conditions for harmless treatment and recycling of the halogen-containing plastics.

The invention discloses a packaging method of a QFN fingerprint identification chip, belonging to the technical field of semiconductor chip packaging. The process comprises the following steps: mounting a loading film on the back of a lead frame; adhering the chip to the lead frame; curing silver paste; performing plasma cleaning; performing wire bonding; performing plastic packaging; removing theloading film; performing post curing; removing residual glue; baking; thinning a plastic cover and pasting a reinforcing film; cutting off a connecting rib to carry out a strip test; printing a marking; removing the reinforcing film; and cutting for molding. The invention provides a packaging method capable of improving the yield of QFN fingerprint identification chip packaging.

The invention relates to the field of high polymer materials, in particular to a dicyclopentadiene-ethylidene norbornene copolymer and a preparation method thereof. The dicyclopentadiene-ethylidene norbornene copolymer comprises the following components in mass ratio: the mass ratio of a dicyclopentadiene monomer to a catalyst is (5000-50000): 1, the mass ratio of the dicyclopentadiene monomer to ethylidene norbornene is 100: (5-50), and the mass ratio of the dicyclopentadiene monomer to an antioxidant is 100: (0.01-2). The preparation method comprises the following steps of: fully and uniformly mixing an organic solvent in which dicyclopentadiene, ethylidene norbornene and the antioxidant are uniformly dissolved and an organic solvent in which the catalyst is uniformly dissolved, immediately injecting the mixture into a mold, carrying out curing molding at 40-80 DEG C, and carrying out post-treatment at 120-150 DEG C. The dicyclopentadiene-ethylidene norbornene copolymer disclosed by the invention has the advantages that the types of formula raw materials of the dicyclopentadiene-ethylidene norbornene copolymer are simplified, the ratio of the formula raw materials is adjusted, the dosage of the catalyst is reduced, the preparation process is simplified, and the copolymer with good strength, impact toughness and thermal stability is obtained.

The invention discloses a plastic packaging type IPM module installing structure. The installing structure comprises a lead frame group. The installing structure further comprises a DBC plate and a PCB circuit board which are fixedly installed and electrically connected with the lead frame group. The DBC plate and the PCB circuit board are arranged in a mutually electrically connected way. A plurality of welding holes are arranged on the PCB circuit board. Welding pins corresponding to the welding holes are arranged on the lead frame group. The PCB circuit board and the lead frame group are welded and fixed through the welding holes and the welding pins. The risks of insufficient solder or welding dislocation due to simultaneous welding of multiple pins of the lead frame group can be lowered. The technical operation difficulties are alleviated. Product reliability is further improved.

The invention provides a synthesis method of alpha-aluminum trihydride, which comprises the following steps of: step 1, adding bis (bromomethyl) benzene into an anhydrous ether solution of lithium aluminum hydride, and reacting in an inert atmosphere to obtain an aluminum trihydride ether complex after the reaction is finished; and step 2, conveying the aluminum trihydride diethyl ether complex into toluene, carrying out deetherification precipitation, filtering, washing a filter cake, and drying the filter cake to obtain alpha-aluminum trihydride. According to the synthesis method, the used raw material bis (bromomethyl) benzene is easy to purify, the problems that the raw materials contain impurities such as FeCl3, are difficult to purify, are sensitive to moisture in air and the like are solved, a byproduct LiBr generated in the synthesis process is dissolved in a solvent diethyl ether, and an intermediate AlH3. N [(C2H5) 2O] solution in the synthesis process can be directly subjected to ether removal and crystal transformation in high-temperature toluene without filtration to generate alpha-AlH3, so that the equipment requirement and the process operation difficulty are reduced, and the obtained product is high in yield and good in quality.

The invention discloses a method for preparing fisetin by an enzyme method. The method comprises the steps: crushing a raw material cotinus coggygria, and adding a citric acid solution and a plant extraction compound enzyme so as to enable the fisetin to be fully dissolved out of the citric acid solution; collecting enzymatic hydrolysate; concentrating the combined enzymatic hydrolysate into extract, adding high alcohol into the extract until the high alcohol is completely dissolved, and concentrating, crystallizing and drying filtrate to obtain a fisetin crude product; and recrystallizing the fisetin crude product twice by using a recrystallization solvent to obtain a high-purity fisetin refined product after twice recrystallization. According to the method, the citric acid solution is adopted to extract fisetin, so that fat-soluble substances in the enzymatic hydrolysate are extremely few, refining can be directly completed through a recrystallization process, a column chromatography process is not needed, the process operation difficulty and efficiency are reduced, the production efficiency is improved, and the method is suitable for industrial production. According to the invention, the recrystallization process is optimized, so that the refined fisetin product obtained after recrystallization is a needle-like crystal.

An etching method comprises the steps of performing a first ionization operation on a mixed gas of Cl2 and BCl3 in a vacuum chamber to form a first plasma, and performing a dry etching operation on asource and a drain by using the first plasma; and performing a second ionization operation on C4F8 in the vacuum chamber to form a second plasma, and performing a repairing operation on the source anddrain by using the second plasma. In the above etching method, the main etching step and the repairing operation are performed in the same chamber without adding extra operating chamber or water washing device, so that the overall process operation is not difficult. Further, since C4F8 belongs to a compound with a relatively large molecular weight, the metal sidewall after the main etching can bewell protected during the repairing operation, and at the same time, the metal sidewall can be repaired and protected to some extent.

The invention discloses a thermal-imager installation reference surface deviation elimination installation and adjustment method, and relates to a thermal-imager calibration and installation technology, and particularly to technology of thermal-imager installation reference surface deviation elimination. According to the method of the invention, a place between an objective lens seat and a main shell body is padded with a correspondingly sized gasket according to deviation distance and an upper/lower position of deviation of a small-view-field imaging point relative to a moving dividing line to achieve the purpose of installation and adjustment. The method of the invention can quickly and conveniently eliminate thermal-imager installation reference surface deviation in real time, reduces rework, and saves production costs.

The invention discloses a method for preparing diepoxide by a one-pot method. The method comprises the following steps: S1, epoxidation reaction: adding dialkene into a reactor at a low temperature, slowly dropwise adding an m-chloroperoxybenzoic acid solution, and reacting to obtain a diepoxide crude product solution; and S2, separation and purification: adding a reducing agent aqueous solution into the diepoxide crude product solution, carrying out a reduction reaction, extracting to separate out an organic phase, carrying out a neutralization reaction, extracting to separate out an organicphase, washing with water, removing water, filtering, and carrying out reduced pressure distillation on filtrate to obtain the diepoxide. According to the invention, the traditional process of preparing a solvent through high vacuum distillation is prevented, an m-chloroperoxybenzoic acid solid raw material does not need to be separated, the diepoxide is obtained through the one-pot reaction of the dialkene and the m-chloroperoxybenzoic acid solution, the process operation difficulty is reduced, the safety is improved, the purity of the prepared diepoxide is 91% or above, the yield is 95% or above, and the large-scale industrial production is facilitated.