35results about How to "Overcome the defect of low yield" patented technology

The invention relates to the catalytic cracking field of heavy hydrocarbon class raw materials and particularly discloses a hydrocarbon catalytic converting method with high butene and light arene yields. The method comprises the following steps: 1, enabling a heavy hydrocarbon class raw material to carry out contact reaction with a first cracking catalyst in a first reactor, and then carrying out separation so as to obtain a first carbon depositing catalyst and a first reaction product; 2, enabling light cracked gasoline of which the final boiling point does not exceed 90DEG C to carry out contact reaction with a second cracking catalyst in a second reactor; and 3, directly guiding a reaction mixture which is obtained through reaction in the second reactor into a third reactor without separating the reaction mixture, enabling the reaction mixture to carry out contact reaction with hydrogenation modified cracked light oil of which the boiling range is between 200DEG C and 390DEG C, and then carrying out separation so as to obtain a second carbon depositing catalyst and a second reaction product, wherein the hydrogenation modified cracked light oil is prepared by carrying out hydrogenation treatment on the cracked light oil. High butene yield and high light arene yield can be obtained by the method provided by the invention.

The invention provides a preparation method for granulose condensable sugar. The preparation method comprises the following steps: mixing and stirring crystallization agent resistant, overheated and supersaturated cane sugar liquid and powdery condensable sugar seed crystals; after vacuum drying, granulating with a high speed granulator; then forced air drying and dry sieving to obtain a granulose condensable sugar product. The condensable sugar prepared by the preparation method is uniform in grain, high in flow ability and high in yield.

The invention relates to a synthesis method of benzo[d][1,2,3] thiadiazole-7-formic acid trifluoroacetate. The synthesis method comprises the following main steps of: performing esterification on m-aminobenzoic acid serving as an initiative raw material and methanol so as to obtain m-aminobenzoic acid methyl ester; in the presence of a surfactant, reacting the m-aminobenzoic acid methyl ester and thiocyanate so as to obtain N-(3-carbomethoxy phenyl)-thiourea; adding bromine into the N-(3-carbomethoxy phenyl)-thiourea in chlorobenzene or glacial acetic acid to perform a cyclization reaction so as to obtain 2-amino-7-carbomethoxy benzothiazole; performing heating and loop opening on the 2-amino-7-carbomethoxy benzothiazole in aqueous solution of KOH and performing diazotization and loop closing under an acid condition so as to obtain 7-carboxylic acid-[1,2,3] diazosulfide; and in the presence of oxalyl chloride, performing an esterification reaction on the 7-carboxylic acid-[1,2,3] diazosulfide and trifluoroethanol so as to obtain a target product. Compared with the prior art, the method increases the yield of the benzo[d][1,2,3] thiadiazole-7-formic acid trifluoroacetate.

The invention belongs to the technical field of oligosaccharide preparation, and relates to a continuous cyclic preparation method of a high-purity lactulose solution and a product thereof. Specifically speaking, the preparation method comprises the following steps: (1) performing lactulose isomerisation; (2) performing acidity adjustment; (3) diluting, dispersing and separating; (4) purifying clear lactulose liquid; (5) performing cyclic utilization of a catalyst. Through the preparation method, high-concentration lactulose solution and a subsequent product thereof can be prepared. Accordingto the continuous cyclic preparation method of the high-purity lactulose solution and the product thereof, sodium metaaluminate / an alkaline matter is taken as an alkaline complexing catalyst for the first time in China, and the conversion rate and lactulose concentration achieved by preparing the lactulose by taking the sodium metaaluminate / an alkaline matter as the alkaline complexing catalyst are far higher than those achieved by adopting a boracic acid / sodium hydroxide system; repeated cyclic use of a sodium metaaluminate catalyst is realized; the defect that precipitate wraps the lactuloseis overcome. The preparation method provided by the invention meets resource-saving and environment-friendly production requirements, and provides beneficial experience and reference for promoting clean, high-efficiency and environment-friendly lactulose industrial production.

The invention provides a catalyst and its preparation method and application. The catalyst comprises a carrier and an active component and an auxiliary agent which are loaded on the carrier, wherein the carrier is an activated carbon carrier which has undergone acid pickling and oxidation and has particle size of 200-2000 microns; the active component is the Group VIII metal component; and the auxiliary agent is the Group IVB metal component. When the catalyst provided by the invention is used in preparation of low carbon alcohols from synthesis gas, low carbon alcohols can be prepared at low temperature, and contents of low carbon alcohols, especially methanol and ethanol, in an oil-phase product are high. The preparation method has advantages of mild condition, high conversion per pass and low energy consumption, and is beneficial to industrial popularization.

The invention discloses a method for improving Mn alloy yield in semisteel steel-making. The method comprises the following steps: adding semisteel in a converter and adding slag making materials to perform converter smelting; and then performing the converter smelting terminal control and tapping. In the tapping process, middle carbon manganese iron alloy is added to increase the manganese of the semisteel, wherein the slag making material comprises ferrosilicon, active lime and high-magnesium lime, the adding amount of the slag making material enables the slag basicity to be 3-4, and the adding amount of the ferrosilicon is 4-6kg / ton of steel. By adopting the method disclosed by the invention, the high catch carbon tapping can be realized, the terminal oxygen activity is effectively reduced so as to effectively improve the Mn alloy yield.

The invention belongs to the technical field of bimetal composite plate preparation, and particularly relates to a bimetal composite plate and a preparation method thereof. According to the bimetal composite plate, by adopting a solid-liquid composite matched die-casting process, a bimetal composite plate blank with metallurgical composite strength is obtained by casting liquid carbon steel and solid stainless steel / nickel-based alloy for metallurgical composite, and then the composite plate blank is subjected to die-casting forming, so that the bonding quality and the wall thickness of the bimetal metallurgical composite plate blank meet preset requirements; and finally, a finished composite plate is obtained through hot rolling and cold rolling or cold rolling. According to the preparation method, the forging composite plate blank is directly prepared with the cooperation of casting forming and die casting processes, the quality of the composite plate blank is better than that of an as-cast composite plate blank, the process is simple, efficiency is high, and time and labor are saved.

The invention discloses a processing method for a lysine-containing solution. The processing method includes that the lysine-containing solution is enabled to sequentially pass one or more groups of positive ion exchange resin column groups which are in serial connection sequentially until the concentration of lysine in liquid flowed from ends of the one or more groups of positive ion exchange resin column groups is not larger than 0.1g / dL, each group of positive ion exchange resin column groups comprises one or more positive ion exchange resin columns which are in a parallel connection, and positive ion exchange resin columns with lysine are subjected to elution with an alkaline solution to obtain a lysine-containing elution. The processing method for the lysine-containing solution is characterized in that the lysine-containing solution passes the positive ion exchange resin column groups under the condition that the pH is 1.0-2.0 or the concentration of lysine is not lower than 1.0g / dL. The invention further discloses a circulating processing method for the lysine-containing solution. The processing method can improve the yield of the lysine, and be widely applied to industrial production.

The invention discloses a method for screening high-yield vitamin B2 strains. The vitamin B2 high-yield strains are obtained through the following steps: the original strains are pretreated, subjected to ultraviolet and chemical mutagenesis, and then domesticated by metabolic substrate analogues, and finally re-treated. It is obtained by screening nutrient medium and fermentation medium. The present invention comprehensively utilizes physical and chemical compound mutagenesis and domestication of metabolic substrate analogues, thereby screening out a stable and high-yielding vitamin B2 strain, which overcomes the defect of low vitamin B2 production in the prior art compared with the original strains , under the condition that the fermentation cycle remains unchanged, its vitamin B2 synthesis ability is increased by about 6g / L, and the fermentation cost is greatly reduced.

The invention provides a catalyst and its preparation method and application. The catalyst comprises a carrier and an active component and an auxiliary agent which are loaded on the carrier, wherein the carrier is an activated carbon carrier which has undergone acid pickling and oxidation and has particle size of being greater than or equal to 30 microns and less than 200 microns; the active component is the Group VIII metal component; and the auxiliary agent is the Group IVB metal component. When the catalyst provided by the invention is used in preparation of low carbon alcohols from synthesis gas, low carbon alcohols can be prepared at low temperature, and contents of low carbon alcohols, especially methanol and ethanol, in an oil-phase product are high. The preparation method has advantages of mild condition, high conversion per pass and low energy consumption, and is beneficial to industrial popularization.

The invention provides a method for increasing yield of major proteins 2 and 3 in royal jelly by liquid chromatography purification. The method comprises steps as follows: royal jelly is dissolved inan extraction buffer solution, the mixture is mixed uniformly and centrifuged, a supernatant is taken, saturated ammonium sulfate is added to the supernatant for precipitation, a supernatant is takenafter centrifugation, filtering is performed by a filter membrane, and a sample buffer solution is obtained; the sample buffer solution is replaced with a buffer solution A with pH being 7.0 by an ultrafiltration centrifuge tube; a royal jelly sample is loaded to a pre-assembled weak cationic chromatographic column balanced by the buffer solution A; the column is subjected to gradient elution by amixed solution of the buffer solution A and a buffer solution B, the ratio of the buffer solution B is gradually increased from 0 to 100%, and major proteins 2 and 3 in the royal jelly are separatedand purified in sequence. According to the method for increasing the yield of the major proteins 2 and 3 in the royal jelly by liquid chromatography purification, abundance of the major proteins 2 and3 in the royal jelly is increased, yield of the major proteins 2 and 3 in the royal jelly is increased, repeatability is good, the yield is high, and the major proteins 2 and 3 in the royal jelly canbe produced on a large scale.

The invention discloses a butadiene preparation method. The method comprises a step that a cracking raw material is subjected to a steam cracking reaction, the cracking raw material contains 5-100wt% of cyclohexene. The butadiene preparation method can substantially improve the butadiene yield.

In order to effectively solve the technical problems of narrow application range, difficult demoulding, low yield of airbag core film, short service life, complicated process and high cost of the existing manufacturing method of non-equal-diameter closed square tubular carbon fiber beams of unmanned aerial vehicles, the present invention A method for manufacturing a UAV non-equal closed square tubular carbon fiber beam is proposed, including steps: 1) processing an upper die and a lower die; step 2) using the upper die to process an upper beam; step 3) Using the lower female mold to process the lower beam; step 4) gluing the upper beam and the lower beam with the gluing and joining tool; step 5) removing the gluing and joining tool to obtain the required non-equal diameter closed square tubular carbon fiber beam. The invention divides the integral component into two parts and forms them separately. Compared with integral forming, the requirements for forming process and forming tooling are lower, and the problem of difficult demoulding of non-equal-diameter closed square tube beams is solved.

The invention provides a preparation method of butadiene. The method comprises following steps: carrying out hydrogenation reactions with hydrocarbon raw materials, which contain benzene and / or alkyl benzene, in the presence of a hydrogenation catalyst, and then carrying out steam cracking reactions by taking the obtained hydrogenation reaction products as part of the cracking reaction raw material. The preparation method of butadiene is capable of obtaining a high yield of butadiene and a low yield of methane, and thus reduces the energy consumption of a cooling cabinet during the separation process of cracking gas.

The invention relates to the field of production of high-value oil products by processing inferior diesel oil, and discloses a method for processing an inferior diesel oil raw material through movingbed hydrogenation. The method comprises: in the presence of hydrogen, introducing an inferior diesel oil raw material into a moving bed hydrorefining reaction unit, and carrying out a first contact reaction with the hydrorefining catalyst contained in the moving bed hydrorefining reaction unit; introducing the hydrogen and the remaining hydrorefining catalyst-separated material into a moving bed hydro-upgrading reaction unit, and carrying out a second contact reaction with the hydro-upgrading catalyst contained in the moving bed hydro-upgrading reaction unit; and separating and fractionating the remaining hydro-upgrading catalyst-separated material to obtain a naphtha product and a product diesel oil. With the method of the present invention, the disadvantages that the use of the fixed bedhydrogenation reactor as the main device can cause the short service life of the catalyst, and the insufficient contact between the oil and gas can cause the low yield of the product oil can be overcome.

The method discloses a method of preparing butadiene from gasoline. The method takes a hydrogenation reaction product as at least part of a cracking raw material to carry out steam cracking reactions, wherein the hydrogenation product is prepared according to at least one method picked from following two methods: (1) method one, carrying out hydrogenation reactions with gasoline, whose aromatic hydrocarbon mass content is larger than 12%; (2) method two, separating at least one component of a C6 fraction, a C7 fraction, and a C8 fraction from gasoline, whose aromatic hydrocarbon mass content is larger than 12%, and then subjecting the separated fraction to carry out hydrogenation reactions. The method provided by the invention of preparing butadiene from gasoline has a high yield of butadiene and a low yield of methane, and thus the energy consumption of the cooling box in the separation process of cracking gas is reduced.

The invention relates to the catalytic cracking field of heavy hydrocarbon class raw materials and particularly discloses a hydrocarbon catalytic converting method with high butene and light arene yields. The method comprises the following steps: 1, enabling a heavy hydrocarbon class raw material to carry out contact reaction with a first cracking catalyst in a first reactor, and then carrying out separation so as to obtain a first carbon depositing catalyst and a first reaction product; 2, enabling light cracked gasoline of which the final boiling point does not exceed 90DEG C to carry out contact reaction with a second cracking catalyst in a second reactor; and 3, directly guiding a reaction mixture which is obtained through reaction in the second reactor into a third reactor without separating the reaction mixture, enabling the reaction mixture to carry out contact reaction with hydrogenation modified cracked light oil of which the boiling range is between 200DEG C and 390DEG C, and then carrying out separation so as to obtain a second carbon depositing catalyst and a second reaction product, wherein the hydrogenation modified cracked light oil is prepared by carrying out hydrogenation treatment on the cracked light oil. High butene yield and high light arene yield can be obtained by the method provided by the invention.

The invention provides a method for removing a substance difficult to volatilize from a wafer, applied to a tungsten etching back process of a deep trench isolation processing process; in the deep trench isolation processing process, the substance difficult to volatilize is generated easily, and the substance difficult to volatilize is attached to the wafer; the method comprises the following steps of S1, putting the wafer into a reaction cavity; S2, heating the wafer, and pumping first reaction gas and second reaction gas to the reaction cavity; S3, controlling the heating temperature on thewafer to remove metal impurities attached on the wafer; and S4, maintaining the flow of the pumped second reaction gas to enable the second reaction gas to be reacted with the substance difficult to volatilize so as to form a volatile substance. The technical scheme has the beneficial effects that the shortcoming of relatively low wafer yield caused by the fact that the substance difficult to volatilize and metal impurities are attached on the wafer in the prior art can be overcome.

The invention provides a manufacturing method for an unmanned aerial vehicle non-equal-diameter closed square pipe shaped carbon fiber beam so as to effectively solve the technical problems that an existing manufacturing method for the unmanned aerial vehicle non-equal-diameter closed square pipe shaped carbon fiber beam is narrow in application range, demolding is difficult, the airbag core filmyield is low, the service life is short, the flow is complicated, and the cost is relatively high. The manufacturing method for the unmanned aerial vehicle non-equal-diameter closed square pipe shapedcarbon fiber beam comprises the following steps that 1) an upper female die and a lower female die are machined; 2) an upper beam is machined by using the upper female die; 3) a lower beam is machined by using the lower female die; 4) the upper beam and the lower beam are bonded by using a bonding combining tool; and 5) the bonding combining tool is removed to obtain the required non-equal-diameter closed square pipe shaped carbon fiber beam. According to the manufacturing method, an integral component is divided into two parts to be separately formed, compared with integral forming, the requirements on a forming process and a forming tool are relatively low, and the problem of difficult demolding of the non-equal-diameter closed square pipe beam is solved.

The invention discloses a plastic formula with high rate of finished products. The plastic formula comprises the following components in parts by weight: 69-88 parts of polypropylene, 1.3-1.5 parts ofstannous octoate, 0.2-1 part of monomer resin, 5-6.2 parts of calcium carbonate, 1.3-1.5 parts of a preservative, 0.2-1 part of a plasticizer, 1.1 parts of an alumina powder and 1.3 parts of magnesium stearate; the raw materials are fully mixed and then put in an injection molding machine for die-cast molding. Compared with the prior art, the plastic formula disclosed by the invention has the advantages of being low in price, high in rate of finished products and excellent in performance.