152results about How to "Reduce stirring speed" patented technology

A carrying process for the carried non-metallocene catalyst includes activating the porous carrier, washing, filtering, drying and directly carrying the nno-metallocene catalyst used for olefine polymerization. Said catalyst can be used for the slurry-type or gas-phase homopolymerization or copolymerization of C2-C10 olefin, styrene, or ethylene.

The invention provides a genetically engineered bacterium for high-yielding L-valine. A construction method of the genetically engineered bacterium comprises the steps that starting from an escherichia coli W3110, an acetolactate synthase gene alsS of a bacillus subtilis is integrated on a genome of the escherichia coli W3110 and subjected to high expression; an escherichia coli ppGpp 3'-pyrophosphoric acid hydrolytic enzyme mutant R290E/K292D gene spoT is integrated on the genome of the escherichia coli W3110 and subjected to high expression; genes of frdA, frdB, frdC and frdD of four subunits of a lactic dehydrogenase gene ldhA, a pyruvate formate lyase I gene pflB and fumaric reductase on the genome of the escherichia coli W3110 are knocked out; a branched chain amino acid transaminasegene ilvE of the escherichia coli is replaced with leucine dehydrogenase gene bcd of the bacillus subtilis; and an acetyl-hydroxyl acid isomerized reductase gene ilvC of the escherichia coli is replaced with an encoding gene of a mutant L67E/R68F/K75E. According to the genetically engineered bacterium for the high-yielding L-valine, an L-valine fermentation method is further modified. Double-phasedissolved oxygen control is adopted, and the L-valine yield and the saccharic acid conversion rate are improved.

The invention provides a double-impeller mechanical stirring self-suction flotation machine and a flotation method. The double-impeller mechanical stirring self-suction flotation machine comprises a column type flotation cell, a rotary shaft, an upper impeller and a lower impeller, wherein the rotary shaft is vertically inserted into the center of the inner part of the column type flotation cell;the upper impeller is fixed to the middle lower part of the rotary shaft; the lower impeller is fixed to the lower part of the rotary shaft; a guide cylinder sleeves outside the upper impeller; the lower impeller is located on the outer side of the bottom part of the guide cylinder; guide plates are arranged on an inner wall of the guide cylinder along a circumferential direction at intervals; circulation holes are uniformly distributed on the lower part of the guide cylinder along the circumferential direction; an ore feeding pipe and an ore discharging pipeline are symmetrically arranged ontwo sides of the lower part of the flotation cell; the ore feeding pipe is connected with the guide cylinder; and a foam tank is arranged on the upper part outside the flotation cell. According to thedouble-impeller mechanical stirring self-suction flotation machine and the flotation method provided by the invention, a flotation bubble mineralization effect can be improved, a flotation three-phase flow field separation environment is optimized, the reverse flow of an ore pulp and bubbles is realized, and the efficiency and the separation precision of a flotation process are improved.

The invention provides a trichoderma reesei mutant strain VLKDN-1. The preservation number of the stain VLKDN-1 is CCTCC NO:M 2014506. A trichoderma reesei mutant strain capable of producing cellulase in high yield is obtained by adopting an ultraviolet-induced mutation technology combined with shake flask selection. Compared with a starting strain, the enzyme activity of the fermentation supernatant of mutant strain trichoderma reesei VLKDN-1 is increased by 235%, the content of protein is increased by 157%, the colonial morphology of the mutant strain is obviously smaller than that of the starting strain; the hyphae are shorter than that of the starting strain; the branches are more than that of the starting strain. The viscosity of a fermentation strain solution is remarkably reduced by virtue of the characteristics of short hyphae and more branches of the small colonial morphology of the mutant strain in the production process; the purposes of reducing the stirring rate and improving the dissolved oxygen are achieved; the production cost is reduced; the trichoderma reesei mutant strain VLKDN-1 is wide in application prospect.

The invention relates to a fine-particle high-energy low-sensitivity explosive compound and a preparation method thereof. The method comprises the following steps: mixing an explosive with a macromolecular bonder according to a weight part ratio of 100 to (2-5), and stirring at 40-60 DEG C for dissolving in an organic solvent to obtain an explosive compound solution with 5%-30% by weight of explosives; putting the explosive compound solution into an ejection tank, pumping air into the ejection tank to increase the pressure in the ejection tank to be 0.3-0.7MPa, ejecting the explosive compound solution into an explosive antisolvent with the temperature of -10 DEG C to 10 DEG C, performing centrifugal separation on a solid product, washing, and drying to obtain the explosive compound. According to the explosive compound, explosive particles are micron-sized, the CL-20 surface is densely wrapped with the macromolecular bonder in the form of an interwoven mesh shape, the impact sensitivity of the wrapped CL-20 is reduced to be 24%-40% from 100%, and the friction sensitivity is reduced to be 66%-92% from 100%.

The invention relates to a method for producing crystals of cefadroxil monohydrate, comprising the following steps: adding an N, N-dimethyl formamide solvent compound of cefadroxil to a mixed solvent of N, N-dimethyl formamide and water, wherein the mass ratio of the cefadroxil solvent compound to the mixed solvent is 1:1-1:2, stirring to obtain a suspending liquid, and keeping the temperature at15-30 DGE C and the pH value of the solution at 6.0-7.5 during feeding; after the cefadroxil solvent compound is totally changed into the cefadroxil monohydrate, reducing the pH value of the suspending liquid to 4.5-5.0 within 1-20 minutes, keeping the temperature at 10-18 DEGC, and stirring for crystal cultivation for 10-90 minutes; and filtering, washing and drying after crystal cultivation is finished to obtain a product, the square platy crystal-form cefadroxil monohydrate. The square platy crystal-form cefadroxil monohydrate obtained by the method has uniform particle size distribution, does not generate coalescence, and is applicable to industrial production.

The invention discloses a humic acid type porous adsorption material and a preparation method and application thereof, and belongs to the technical field of preparation of materials and environmentalmanagement. The preparation method disclosed by the invention has the beneficial effects that the humic acid type porous adsorption material is prepared by using and dissolving raw materials of potassium humate and natural macromolecules, then adding a crosslinking agent and an initiating agent, dropwise adding polyethylene glycol under a heating condition, stirring and drying; the method is simple to operate; the raw materials are easy to obtain; the requirements on equipment are low; and the cost is low. In terms of the prepared porous adsorption material, humic acid is macromolecular organic acid composed of aromatics and multiple functional groups thereof, is naturally degradable, and has good biological activity and the functions of adsorption and absorption, complexation, exchange and the like, so that a formed porous structure is capable of enhancing the adsorption and complexation effects on heavy metal ion particle matters; when the porous adsorption material is applied to pollution management and ecological restoration, heavy metal in a water body and soil can be adsorbed; and after adsorption is finished, the porous adsorption material can be used as a soil fertilizer, and can improve soil structure, restore ecological balance and reduce chemical pollution.

The invention provides a method for producing zinc by use of high-silicon zinc oxide ore. The method comprises the following steps: grinding high-silicon zinc oxide ore and mixing the obtained product with water in a mass ratio of 0.7-0.8:1; heating the mixture to 40 to 60 DEG C and preparing hot ore pulp; preheating H2SO4 solution in a concentration of 150 to 220 g/L to 40 to 90 DEG C; continuously conveying the hot ore pulp and hot sulfuric acid solution in a volume ratio of 1:3-5 into a reaction container; supplying air to ensure that the pressure in the reaction container is 0.4 to 0.8 MPa; performing reaction for 30 to 180 minutes at a temperature kept between 80 and 130 DEG C at a stirring speed of 200 to 300 revolutions per minute so as to leach zinc; forming leaching solution from leaching slurry discharged from the reaction container through liquid-solid separation; adopting a conventional zinc hydrometallurgy process to treat the leaching solution; and producing the zinc through iron removal, purification, electrowinning and melt casting. The method for producing zinc has the characteristics of high leaching efficiency, high safety, reaction conditions easy to realize, low production cost and the like.

The invention belongs to the technical field of filling adhesive preparation and particularly relates to flowing type chip-grade bottom filling adhesive and a preparation method thereof. No diluents is adopted in the chip-grade bottom filling adhesive prepared through the method, the adhesive has the advantages of being high in flowing speed, high in reliability, low in thermal expansion coefficient, high in bending modulus, low in moisture absorbility and the like, through adding of wetting dispersant, the effects of effectively lowering viscosity and increasing flowing speed are remarkable, it is more effective to disperse the filling material uniformly, and reliability of a packaged component is guaranteed.

The present invention relates to an aerated stirring apparatus for automatically controlling an aeration volume. The apparatus comprises a vessel body, an aerating structure, a controlling structure, and a stirring structure. The stirring structure comprises a stirring shaft, a power input structure of the stirring shaft that supplies power to the stirring shaft, and a plurality of stirring blades disposed on the stirring shaft and located within the vessel body. The aerating structure comprises a plurality of separate aeration lines. An inlet chamber, an aeration conduit with one end communicating with the inlet chamber, and an aeration manifold communicating with the other end of the aeration conduit form an aeration line. An electromagnetic valve is disposed on each aeration line to control an air intake volume. The controlling structure comprises a plurality of controllers. A probe of a dissolved oxygen device is fixed on each of the stirring blades. The ON/OFF of the corresponding electromagnetic valve is controlled by the controller according to a received signal of oxygen concentration. The apparatus can effectively control the problems of non-uniform gas delivery, high energy consumption, wasting gas resources, high costs, poor product quality, and low productivity in an amplified reactor.

The invention relates to a preparation method of a SAPO-34 molecular sieve. The raw materials are as followings: a template R, an auxiliary template R', a phosphorus source, a silicon source, an aluminum source and deionized water in the molar ratio of 1-3:0-0.3:1.8-2.2:0.3-0.6:1:50-180. The method comprises the steps of: (1) evenly mixing and stirring the aluminum source, phosphorus source and part of the deionized water; (2) sequentially adding the silicon source, template agent R, auxiliary template R' and the rest of the deionized water into the above mixed solution to obtain a gel; and (3) transferring the gel to a crystallization kettle, adding seed crystal, crystallizing, filtering, washing, drying and roasting to obtain the SAPO-34 molecular sieve. Due to the addition of the small amount of auxiliary template R 'and seed crystal, the prepared cubic crystal has high degree of crystallinity and structured crystal form, and the product has large specific surface area and high acid content, shows a great prospect for industrialization, and is expected to be used as a catalyst for low carbon olefin preparation from methanol and automobile tail gas treatment.

The invention discloses a fulvic acid type three-dimensional network composite material, and a preparation method and application thereof, and belongs to the technical field of material preparation and environment treatment. The fulvic acid type three-dimensional network composite material is prepared by dissolving fulvic acid and natural macromolecules, adding a cross-linking agent and an initiating agent, adding polyethylene glycol dropwise under the condition of heating, and stirring and drying. The fulvic acid is a high molecular organic acid which consists of aromatic groups and various functional groups thereof, is natural and degradable, and has good physiological activity and the functions of adsorbing, absorbing, complexing, exchanging and the like. The formed porous structure canenhance the adsorbing or complexing actions on heavy metal ion particulate matters. When the composite material is used for pollution treatment and ecological remediation, heavy metals in a water body and land can be adsorbed; after the adsorption is completed, the composite material can also be used as soil fertilizer to improve soil structure, restore ecological balance and reduce chemical pollution.

The object of the present invention is a new method for kneading dough containing soft wheat flour, conducted in the presence of ozone and using at least one mechanical agitator (“fraser”). The dough so produced may be used to manufacture finished cereal bakery products such as loaves or related products (raised pizza dough for example).

A further object of the invention is new kneading devices adapted for kneading in the presence of ozone.

The invention discloses a fatty alcohol ether carboxylic acid preparation method which comprises the following steps: the first step, mixing fatty alcohol ether with deionized water, adding alkali, warming and reacting, then adding a catalyst, keeping pressure under the oxygen environment to react, finishing reacting until oxygen pressure does not change again, extruding a material mixed solutionand generating alcohol ether carboxylate; the second step, performing suction filtration on the mixed solution obtained in the first step to obtain filtrate and filter cake, utilizing deionized waterto wash the filter cake and storing the filter cake in alkali liquor to be applied to the next oxidizing reaction, wherein the filtrate is a fatty alcohol ether carboxylate solution; the third step, adding acid into the filtrate obtained in the second step, warming ad reacting, then adding inorganic salt to be stirred evenly, standing and layering and obtaining fatty alcohol ether carboxylic acidfrom the upper layer. The fatty alcohol ether carboxylic acid preparation method disclosed by the invention has the advantages of simple technological process, production process easy to control, highproduct purity, stable quality, green and environment-friendly production process, quick reaction speed, low energy consumption and more economic production process.

The invention relates to bacillus licheniformis, a method for preparing a flocculating agent from the bacillus licheniformis and an application of the flocculating agent. The strain is bacillus licheniformis LZ-1 which is preserved in China General Microbiological Culture Collection Center on November 06, 2012 with preservation number of CGMCC No.6782. With the application of the bacillus licheniformis LZ-1 as well as a production method provided by the invention, a fermentation broth, which is high in flocculating activity, is obtained under the condition that an initial pH value is alkaline, and high-molecular-weight polysaccharide, which is 0.8-3.2*10<7>Da, serves as a major flocculating active ingredient. The polysaccharide flocculating agent provided by the invention has the advantages of being high in flocculating activity, low in dosage, low in production cost and the like, and the flocculating agent has a flocculating conditioning effect on sludge. The bacillus licheniformis LZ-1 fermentation broth or a product, which is extracted from the fermentation broth and contains the polysaccharide flocculating agent, can be applied to deep dewatering by sludge plate-frame pressure filtration in a mode of replacing a polyacrylamide flocculating agent, so that sewage treatment plant concentrated sludge, which is 96-98% in moisture content, is further dewatered into a sludge cake which is lower than 60% in moisture content and the size of the sludge is diminished to be 1/20-1/10 of an original size.

The invention discloses an enzyme slimming cream and a preparation method thereof. The enzyme slimming cream is prepared from 1-10 parts of orbignya oleifera seed oil, 1-5 parts of crambe abyssinica seed oil, 2-8 parts of caprylic/capric triglyceride, 2-8 parts of palmitate, 1-9 parts of dimethylcydosiloxane, 1-9 parts of polydimethylsiloxane, 0.05-0.4 part of propylparaben, 0.05-0.3 part of carbomer, 1-15 parts of glycerine, 1-15 parts of propanediol, 50-80 parts of deionized water, 0.05-0.3 part of triethanolamine, 0.01-0.05 part of water-borne preservative and 4-10 parts of plant fat-burn mixture. The preparation method includes adding oil-soluble mixture of the raw materials into water-soluble mixture to achieve emulsifying, cooling emulsified mixture, then adding fat-burn mixture into the emulsified mixture and uniformly stirring to obtain the enzyme slimming cream. The enzyme slimming cream prepared by the method has quick action and zero toxic and side effects without any harm to normal metabolism of human bodies.

The invention relates to a process for preparing 2, 4-dichlorotoluene by using p-chlorotoluene, chlorine as raw material for synthesizing 2, 4-dichlorotoluene through catalyzed chloridization, which comprises the steps of synthesizing, alkaline cleaning, rectifying, the synthesizing reaction temperature is between 35-45 deg. C, the alkaline cleaning agent for washing synthetic reaction product in the alkaline cleaning step is sodium carbonate crystal containing crystal water. The invention increases the yield of 2, 4-dichlorotoluene and improves the chlorine distribution status during reaction.

The invention relates to an adjustable n-shaped mixer. The mixer is in an n shape. A motor connecting shaft which is connected with a motor is arranged on the upper portion of the mixer. A cuboid screw type mixing blade adjuster is welded to the lower end of the motor connecting shaft. Tooth sliding blocks which are located in a slideway and engaged with the slideway are pushed by rotating a screw, so that mixing blades fixed to the lower portions of the tooth sliding blocks are driven, and the distance between the two mixing blades is adjusted to be adapted to different cylindrical containers. Each mixing blade is in the shape of an inverted L, and in order to improve the mixing effect, the included angle between the transverse direction of the mixing part of each mixing blade and the tangent line of a rotating arc of the mixing part of the mixing blade is 35 degrees. The purpose of even mixing is achieved through revolution of the mixing blades and a lower revolution speed, and thus side effects of mechanical shearing on a polymer solution are reduced to the maximum extent in the preparation process. The adjustable n-shaped mixer is mainly used for stirring in the indoor polymer solution preparation process.

The invention relates to a gravel bed foundation deep-cement-mixing pile impervious wall construction method, and relates to the technical field of cement mixing pile impervious wall construction. Thegravel bed foundation deep-cement-mixing pile impervious wall construction method sequentially comprises the following steps of levelling a ground, excavating a guide slot, surveying and setting out,placing a pile machine in position and levelling, preparing for drilling, drilling a soft soil layer, drilling a gravel bed, drilling after penetrating through the gravel bed, and lifting, spouting and stirring until forming a pile on the ground. According to the gravel bed foundation deep-cement-mixing pile impervious wall construction method provided by the invention, aiming at a foundation with the gravel bed, a soil body can be smoothly drilled, cut and stirred, and a cement grout is quickly fully-filled in a clearance of the gravel bed, so that the quality of a finally formed cement mixing pile impervious wall is further improved.

The invention discloses an industrial crude iodine recovery stirring device, which comprises a sealing cover, wherein a gear shaft is arranged at the central position of the top of the sealing cover;a rack is arranged on the left side of the gear shaft; a moving rod is arranged at the left end of the rack; a cylindrical cam is arranged at the left end of the moving rod; and a supporting frame isarranged above the cylindrical cam, and the supporting frame is further arranged below the cylindrical cam. A braking device of the crude iodine recovery stirring device drives the rack to move back and forth by a cylindrical cam mechanism, the rack drives a stirring rod to rotate in the positive and negative directions, the stirring speed is small, the solution can be fully heated, the heating ismore uniform, and the rotation in the positive and negative directions can cause the solution to generate larger water fluctuation and more vapor dense, so that the iodine vapor still maintains a higher temperature during the transfer process, blocking plates on stirring fan blades can further generate larger water fluctuation, and the swinging plate can enlarge the stirring range.

A polymerizing reactor cooled directly by liquid ammonia for the continuous liquid-phase polyisobutene reaction features that the internal multi-layer squirrel-cage ammonia evaporator with vertical cooling tubes, the external semi-circular tube jacket type ammonia evaporator with vertical cooling tubes, and a three layers combined multifunctional stirrer are used.