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 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 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 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 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 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 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.