40results about How to "Good liquefaction effect" patented technology

The invention discloses a method for preparing biodegradable rigid polyurethane foam with liquefaction products of bamboo waste, which comprises the following steps: 1 mass portion of crude glycerin / polyethylene glycol liquefying solvent and 0.02-0.04 mass portion of concentrated sulfuric acid are added into a reaction vessel, heated till the temperature reaches 120-180 DEG C after a reflux condensation tube is connected to the reaction vessel; 0.2-0.5 mass portion of crushed and dried bamboo waste is added, reacted for 90-180min with stirring, taken out and cooled and neutralized by MgO tillbeing neutral; 1 mass portion of liquefaction products of bamboo waste, 0.02-0.08 portion of a dibutyl tin dilaurate / triethylene diamine mixed catalyst, 0.02-0.06 portion of silicone oil, 0.02-0.1 portion of water and 0.1-0.15 portion of fire retardant are added into a container, premixed for 20-30s when stirred at 2,000r / min, added with sufficient PAPI with the molar ratio between isocyanato-NCOin PAPI and hydroxyl group-OH in bamboo waste liquefaction products being 0.6-1.2, stirred for 10s-15s at 1,000r / min, put into a mould, foamed with standing at room temperature, placed for slaking and mould separating at room temperature for 24h-72h after reaction. The method fully utilizes resources, reduces liquefaction cost, and has a mild reaction temperature and stable liquefaction products;the performance of obtained foam meets the national standard and biodegradability.

The invention belongs to the field of biomedicines and in particular relates to a method for preparing an immobilized enzyme and hydrolyzing diosgenin. The method comprises the following steps: crushing a dried turmeric raw material; adding water and immersing; carrying out enzymolysis and removing impurities, extracting dioscin and hydrolyzing the dioscin into the diosgenin with an immobilized enzyme preparation composition; extracting aviation kerosene to prepare a finished product. By utilizing an immobilized enzyme technology, rhamnosidase and beta-glucosidase, which have an expensive market price, are successfully applied to an industrial product with a lower additional value. A biological method is used for replacing traditional dioscin acidolysis, so that the environmental pollution is remarkably reduced; the method has moderate reaction conditions and a low cost.

The present invention is a preparation process of solution magnesium source. The said preparation process includes: adding solid magnesiumocene and dimethyl magnesiumocene to an organic solvent of 110 deg.C boiling point and stirring for homogeneity; dropping over C9 alkane, over C9 tertiary amine or aromatic aldehyde or aromatic ketone, over C5 primary amine or aliphatic aldehyde or Schiff base formed by ketone and primary amine; further heating while stirring; and decompression distilling to eliminate solvent to obtain solution magnesium source. The said solvent has excellent solid magnesiumocene and dimethyl magnesiumocene liquefying capacity and one portion of the solvent can liquefy three or more portions of magnesiumocene and dimethyl magnesiumocene completely.

The invention discloses a method for liquefying high-low pressure nitrogen double-expansion natural gas, which comprises the following steps: compressing and cooling nitrogen gas, and then introducing the nitrogen gas into the pressurizing end of a low-pressure pressurizing machine for pressurization; after cooling the nitrogen gas to a temperature of between 30 and 45 DEG C by a second after cooler, introducing the nitrogen gas into the pressurizing end of a high-pressure pressurizing machine to obtain high-pressure nitrogen gas which is cooled to a temperature of between 30 and 45 DEG C by a first after cooler; introducing the cooled high-pressure nitrogen gas into a main heat exchanger, cooling the nitrogen gas and raw natural gas to a temperature of 70 DEG C below zero and 30 DEG C below zero by the low-pressure nitrogen gas at the outlet of a low-pressure expander, taking out a current of the nitrogen gas which is introduced into a high-pressure expander for expansion refrigeration and then is introduced into the low-pressure expander for expansion refrigeration to obtain low-pressure nitrogen gas, and simultaneously cooling, liquefying and super-cooling the raw natural gas by the low-pressure nitrogen gas continuously and then leading out the raw natural gas from the main heat exchanger; and throttling the raw natural gas led out of the main heat exchanger by a throttle valve, separating the raw natural gas by a separation tank to obtain liquefied natural gas which is introduced into a storage tank, and returning the gas into the main heat exchanger for recovering cold. The method is applicable to high-low pressure areas and has high liquefaction rate which can reach 100 percent.

The invention discloses a method for producing injection maltose bulk drug, and belongs to the field of food and medicine starch sugar production. Liquidation liquid with the DE value being 5 to 6 andqualified iodine reagent is prepared, so that the liquidation effect is improved; pullulanase, pullulanase, Beta amylase, middle temperature amylase and glucoamylase are added in batches at differentcatalytic time periods and simultaneously act; the saccharification effect is improved; the seed crystal quantity and the grain growing time are increased; the feeding is performed in batches, so that the crystallized sugar cake seed crystals are uniform; the granularity is high; the moth liquid separation is easy. By integrating the process conditions, the method completely reaches the standardsof Chinese pharmacopoeia in version 2015 on high-purity maltose; the important industrial production application potential is realized; the blank in China is hopeful filled.

The invention relates to the field of range hoods, and particularly provides a self-cleaning structure and method of a range hood and the range hood. The self-cleaning structure of the range hood comprises a motor, an inner oil screen which is arranged on an oil fume suction opening of the range hood, and is driven by the motor to act and to intercept oil in oil fume, and a hot air heating devicewhich is arranged on the range hood, and cleans the inner oil screen by heating the inner oil screen, wherein the hot air heating device comprises a fan and an air outlet which is connected with the fan, and is used for heating the inner oil screen. According to the self-cleaning structure and method of the range hood and the range hood, the inner oil screen is arranged to intercept oil particlesin the oil fume, the situation that the oil enters the range hood, and pollutes a wind wheel and an air duct in the range hood to improve the cleaning difficulty is avoided, by heating the inner oil screen, the oil is fast cleaned away, there is no need to heat the wind wheel or the air duct, the heating efficiency is high, the cleaning effect is better, and the range hood cleaning cost is reduced.

A process for preparing the solution as the source of trimethyl indium source includes such steps as preparing schiff base by dewatering reaction between aromatic aldehyde (or ketone) and the primary amine or fatty aldehyde or ketone, adding trimethyl indium to low-boiling-point solvent, stirring while heating, adding schiff base, pressure-reduction distilling to remove solvent and to obtain the mating member of schiff base and trimethyl indium.

The invention discloses a method utilizing phosphate mineralized bacteria to solidify and loosen loose sand particles. The method comprises the steps that bacillus subtilis is inoculated to beef extract and a peptone culture medium for obtaining bacterial liquid, then disodium phenyl phosphate is added to the prepared bacterial liquid, an anhydrous calcium chloride solution with the concentration of 0.5-1.5mol / L is prepared, 70-90g of sand with two levels of less than 0.15mm and of 0.15-0.30mm is prepared according to the closest Fuller packing method and then loaded into a trial mould with a buffering pad and a sand filter, the bacterial liquid and a chemical solution are respectively poured into the prepared sand in the third step through a peristaltic pump according to a volume ratio of 1:1, the flowing speed of the bacterial liquid is controlled to be 4-6mL / min, the flowing speed of the chemical solution is 10-15mL / min, continuous pouring is carried out for 8-15 days, and the sand with the mould is placed into an oven of 60 DEG C for being conserved for 48h and then taken out and released from the mould. The compressive strength of the sand can reach 1.0MPa.