989results about How to "Short process route" patented technology

The invention discloses a method for preparing monopotassium phosphate by using wet-process phosphoric acid. The method comprises the following steps: reacting carbonyl diamide and wet-process phosphoric acid to obtain an intermediate; reacting the intermediate and potassium hydroxide to prepare a monopotassium phosphate product. The method has the advantages of short process route, low energy consumption, stable product quality, low production cost, convenience in operation and safety in production. A side product, namely, slurry can be recycled completely, an entire production process is environment-friendly, clean and free from pollution, and no waste gas, waste water or waste residues are discharged. A response is made to the policy calling of energy saving, emission reduction and clean production, the problems of complex process, instable product quality, high energy consumption and environmental pollution existing in the prior art are solved, and the purity of the obtained monopotassium phosphate product is more than or equal to 98 percent.

The invention discloses a method for desulfurizing acid gas containing hydrogen sulfide and recycling sulfur. The method for desulfurizing acid gas containing hydrogen sulfide and recycling sulfur sequentially comprises the following steps: introducing the acid gas into a combustion furnace to be mixed with air introduced by the other pipeline so as to carry out a combustion reaction; introducing the gas reacted in the combustion furnace into a cooler to be cooled to 230-250 DEG C, after cooling, separating the cooled liquid sulfur at a liquid outlet, introducing mixed gas in the combustion furnace into a catalyst reactor, enabling hydrogen sulfide to react with sulfur dioxide in the catalyst reactor so as to generate sulfur and water, and separating the generated liquid sulfur at the liquid outlet of the catalyst reactor; introducing the mixed gas in the catalyst reactor into a hydrogenation reactor and enabling the sulfur dioxide to react with hydrogen in the hydrogenation reactor; introducing the gas in the hydrogenation reactor into a hydrogen sulfide absorption device and preparing the hydrogen sulfide into elemental sulfur under the action of an alkaline solution, a complex catalyst and the introduced air. The method for desulfurizing acid gas containing hydrogen sulfide and recycling sulfur has the advantages of short process route, high quality of produced sulfur and low energy consumption, is capable of fully removing SO2 gas and is green and environmentally friendly.

The invention discloses a powder metallurgy method for preparing high-density titanium and titanium alloy products. The method comprises the following steps: preparing raw materials and mixing; performing pressure forming; performing atmosphere purifying; performing atmosphere-vacuum sintering. According to the method, titanium powder or titanium alloy mixed powder is adopted as the raw material and is subjected to pressure forming and atmosphere-vacuum sintering in sequence; the atmosphere sintering is adopted at the temperature of 400-600 DEG C, mixed gas of hydrogen and argon is introduced, and heat is preserved for 2-3 hours, thus generating TiHx (x is more than 0 and not more than 2); the vacuum sintering is adopted at the temperature of 600-1350 DEG C, and heat is preserved at 1200-1350 DEG C for 4-6 hours; by virtue of the diffusion analysis effect and the interstitial solid solution of hydrogen, the vacancy concentration and dislocation in titanium are increased, the surface activity of titanium is improved, and the sintering free energy effect is reduced, thus obtaining dense titanium and titanium alloy. The titanium/ titanium alloy products prepared by adopting the method are high in density, the process route is short, a subsequent pressure processing process can be reduced or shortened, and the processing cost is lowered. The problems of high cost and low density of a conventional powder metallurgy method for preparing titanium and titanium alloy are solved.

The present invention relates to the field of feed and oil processing technology, in particular, it relates to an one-step method for producing dephenolized cotton protein. It is characterized by that said invention fully utilizes the characteristics of 6# solvent and methyl alcohol mixed solvent, and utilizes the mutual incompatibility of polar solvent and non-polar solvent and simultaneously uses two solvents in one equipment so as to attain the goal of simultaneously extracting gossypol and oil, and can recover 6# solvent, methyl alcohol and oil.

The present invention discloses a preparation method for optical activity active 3-amino butanol and optical activity 3-amino butyric acid. The optical activity active 3-amino butanol preparation method comprises: in a solvent, under effects of a hydroboration reduction agent and a Lewis acid, carrying out a reduction reaction on a compound represented by a formlu 65 to produce a compound represented by a formlu 14. The optical activity active 3-amino butyric acid preparation method comprises: carrying out a hydrolysis reaction on a compound represented by a formlu 64 to produce a compound represented by a formlu 65. According to the present invention, the preparation method has characteristics of cheap and easily-available raw materials, simple operation, short process route, no hazard of raw materials, high yield, little waste production, environment protection, high raw material conversion rate, high product chemical purity and high product optical purity, and the industrialization is easily achieved. The formulas 64, 65 and 14 are defined in the instruction.

The invention relates to a process for separating and recovering butyl acetate and butyl alcohol in wastewater by using azeotropic rectification, comprising the following steps of: carrying out normal-pressure distillation and thickening on the wastewater containing the butyl alcohol, the butyl acetate, water and organic residues in a first rectifying tower T-01 to obtain pure water and the organic residues through a tower kettle; delaminating condensed steam at a tower top, flowing a water layer back, and causing an organic layer to enter a second rectifying tower T-02 for pressurization and rectification under 120-200 Kpa so that the high-purity butyl acetate is extracted by the tower kettle and the steam with the alcohol ester ratio of 3/1-9/1 is obtained at the tower top; condensing to cause one part of a condensate to back flow and one part of the condensate to enter a third rectifying tower T-03 for pressure reduction and rectification under 3-15 KPa so that the high-purity butyl alcohol is extracted by the tower kettle and the steam with the alcohol ester ratio of 1/3-1/2 is obtained at the tower top; and after condensing and cooling, causing the steam with the alcohol ester ratio of 1/3-1/2 to enter the tower from a feed inlet of the second rectifying tower T-02 for continuous thickening and purification. The process has the advantages of environmental protection, low energy consumption, investment saving, no entrainer addition, high recovery rate (above 99%) of solvents and the like.

The invention discloses sitagliptin and an enzyme-chemical preparation method of an intermediate of the sitagliptin. The method comprises the steps of mixing 3-carbonyl-4-(2, 4, 5-trifluoro-phenyl)butyrate, D-amino acid dehydrogenase, a cofactor, cofactor-catalyzing cyclophorase, an amino doner, a cosolvent and a buffer solution according to a certain ratio to obtain a product (R)-3-amino-4-(2, 4, 5 trifluoro-phenyl)butyrate; enabling the (R)-3-amino-4-(2, 4, 5 trifluoro-phenyl)butyrate to be subjected to the steps of amino protection, condensation and deprotection to obtain sitagliptin free alkali. Compared with the prior art, the method adopted by the invention is less in process route, shorter in reaction time, improved in product purity and yield and lower in production cost, and is suitable for industrial production.

The process of producing natural benzaldehyde directly with cassia twig, leaf and bark as raw material includes the steps of: crushing cassia twig, leaf and bark, and distilling in distiller; hydrolysis of the mixed gas of steam and cassia oil from the distiller, inside hydrolysis reactor with inlet connected to the outlet of the distiller and through contact with alkaline catalyst to produce benzaldehyde in the steam mixture; and condensing the mixture to obtain coarse benzaldehyde product. The present invention can produce natural benzaldehyde by increasing one hydrolysis reactor to available cassia oil producing apparatus, and has short technological path, low power consumption, low cost and coarse benzaldehyde yield of 0.5 %.

A device and a method for preparing a nanometer ceramic particle-reinforced aluminum-based composite relate to a device and a method for preparing a metal matrix composite and aim at solving the problems of long preparing technical path, excessive required equipment and high cost in the existing powder metallurgic method for preparing the nanometer ceramic particle-reinforced aluminum-based composite, as well as the problems of non-uniform distribution, layering and conglobation of nanometer ceramic particles in the existing stirring method. The device comprises a motor, a gearbox, a first gear shaft, a feeding hopper, a baffle, a heating base plate, a first heating device, a slurry collecting groove, a second heating device, a crucible, a cover plate, a hydraulic driving device, an argon protection device, two temperature measuring elements, two screw type stirring impellers and two ultrasonic devices, wherein stirring ends of the screw type stirring impellers extend into the crucible arranged below the gearbox, and probes of the ultrasonic devices penetrate through the cover plate and extend into the crucible. The device and the method, provided by the invention, are used for preparing the nanometer ceramic particle-reinforced aluminum-based composite.

The automatic paper box opening process includes the following steps: detecting, dismantling and recovering packing belt on the paper box; and turning the cover. The device used in the said process includes paper box package dismantling and recovering unit, front cover turning unit and back cover turning unit set along the paper box conveying line. The present invention can complete the number detection, locating, shearing and fast recovering of packing belt on the surface of paper box, the turning of paper box cover and removing the upper lining inside the paper box automatically and successively, is suitable for paper boxes of different sizes and has high work efficiency.

The invention discloses a method for preparing titanium diboride dispersion-strengthened Cu-base composites by using a mechanical alloying method, taking Cu powder, TiO2 powder, B2O3 powder and Mg powder with the granularity less than 100 meshes and purity more than 99 percent as raw materials. The method comprises the following steps of: thoroughly mixing the Cu powder, the TiO2 powder, the B2O3 powder and the Mg powder; carrying out high-energy ball-grinding on the mixed powder for 3 to 15 hours at the revolution speed of 1000 to 2000 rpm at room temperature; acid pickling the powder for 2 to 15 hours at the temperature of 20 to 80 DEG C with 1 to 3 mol/L hydrochloric acid to get mixed powder of Cu and TiB2; drying the mixed powder of Cu and TiB2, and carrying out high-energy ball-grinding on mixed powder of Cu and TiB2 for 1 to 3 hours ; cold pressing the mixed powder of Cu and TiB2 for forming; and at last sintering the mixture of Cu and TiB2 for 1 to 3 hours in a resistance furnace with argon protection gas at the temperature of 800 to 1000 DEG C to get the TiB2 dispersion-strengthened Cu-base composites with granularity of 5 to 10 microns. The method for preparing the TiB2 dispersion-strengthened Cu-base composites by using the simple high-energy ball-milling mechanical alloying method has the advantages of simple technology, low production cost, high product yield and high product quality.

The invention belongs to the technical field of environmental microbiology, and relates to high-efficiency heterotrophic nitrification aerobic denitrifying bacteria and a culture method and application thereof. The bacteria are Rhodococcus sp. DN2.3 with the preservation registration number of CCTCC M209300, can effectively remove ammonia nitrogen, nitrite nitrogen, nitric nitrogen and the mixture thereof from a water body, also can remove CODCr from organic wastewater, are suitable for treating high-concentration organic nitrogen-containing wastewater; the accumulation of nitrite and nitrate is avoided in the denitrifying process; and the process for treating wastewater by using the strain is simple and the denitrifying effect is stable.

A method for continuously producing fuel oil from waste lubricating oil is featured as carrying out treatment of stewing, setting, dewatering and impurity removing for raw material oil to separate out water and mechanical impurities, adding absorbent, catalytic cracking catalyst, molecular weight regulator, sending raw material oil with overheated steam into tube heater after heat exchanging and separating oil gas from heater outlet with fractionating column for obtaining different fue oil.