42results about How to "Does not affect yield" patented technology

The invention provides a soil cadmium passivant which comprises the following raw materials in parts by weight: 30-85% of red mud, 10-70% of rape stalk, less than or equal to 10% of lime, less than or equal to 5% of phosphatic fertilizer, and less than or equal to 1% of zinc, wherein when pH of soil is greater than 6, the lime is equal to 0%. The soil cadmium passivant aims at reducing effective cadmium in the soil; the main raw materials belong to recycled wastes; the consumption of the auxiliary materials is less; the total cost is very low; the pretreatment of the raw materials is very simple, convenient and easy; special treatment processes such as chemical method modification are not required; the passivant can be obtained only by simple air drying, crushing, screening and mixing; the technology is simple; an application method of a passivant product is relatively simple; the passivation on soil cadmium is higher; the passivant has specificity and is wide in application scope; secondary pollution cannot be generated on the soil; the quality and the yield of crops cannot be influenced; the content of effective cadmium in the soil can be reduced effectively; and the passivant is suitable for various moderately and slightly polluted soil types.

The invention discloses a preparation method of cetrorelix. The method has the specific steps that: (A) AM resin is adopted as initial resin; according to cetrorelix main-chain peptide sequence, amino acids with N-terminal Fmoc protection and side-chain protection are coupled sequentially, wherein peptide sequence 6-site amino acid coupling adopts Fmoc-D-Orn(Dde)-OH; (B) when coupling is finished, Fmoc protecting group is removed, and an acetylation reaction is carried out on the N terminal; (C) a mixed solution with hydrazine hydrate and DMF with a volume ratio of 3:97 is used for removing D-ornithine side-chain Dde protecting group; tert-butyl isocyanate is added, such that D-ornithine side-chain in decapeptide resin is subjected to a modification reaction, and fully protected cetrorelix peptide resin is obtained; and (D) peptide resin is subjected to cracking, purification, desalination, and lyophilization, such that cetrorelix can be obtained. The content of a process impurity [D-Cit(Ac)<6>]-cetrorelix is less than 0.1%. The preparation process provided by the invention has the advantages of high product purity and low cost. The preparation method is suitable for large-scale cetrorelix production. With the process, the content of the impurity [D-Cit(Ac)<6>]-cetrorelix can be effectively controlled without influencing the yield of cetrorelix.

The invention discloses a preparation method of TCPP (trichloropropylphosphate) flame retardant, which comprises the following steps of: reacting phosphorus oxychloride with propylene oxide to obtain a TCPP crude product under the catalysis of a Lewis acid catalyst, then washing the crude product by alkali and water and distilling;. after phosphorus oxychloride is added into a reaction vessel, dropwise adding NaOH aqueous solution, then adding a catalyst and dropwise adding propylene oxide for reaction. The color number of the finished product of TCPP is reduced to below No.30 at present, to No.10 as the lowest, from the original above No.60 produced without dropwise adding the sodium hydroxide aqueous solution. The method provided by the invention has the advantages of convenience, simplicity and easiness of operation and is good for operation in production, and enables the appearance of the product to be improved significantly without affecting the yield and acid value of TCPP, as well as the quality of TCPP.

The present invention provides a preparation method of vinylene carbonate used in a lithium battery, which is a technical improvement of the prior synthesis method. On one hand, in the synthesis process of chlorinated ethylene carbonate, different novel initiators are used so that the reaction can be completed within a shorter period of time at the lower temperature; on the other hand, a novel composite antioxidant is added in the technical process of dechlorination, instead of adding a common inhibitor in the prior art. Therefore, the present invention overcomes the defects in the prior preparation method that the products can be easily polymerized and can not be easily separated, and has the advantage that the synthesis purity of the final product is enhanced.

The invention discloses an agricultural planting method and system based on internet of things; the method comprises the steps of acquiring natural environment information and planting alternation history information of a planting area; determining a planting scheme according to a preset database, the natural environment information and the planting alternation history information; planting cropsaccording to the planting scheme and the preset database; and acquiring real-time information of the planted crops to control diseases and pests. The method and system help achieve the effects of maximizing resource utilization, effectively controlling plant diseases and pests and providing good growth conditions for crops. The agricultural planting method and system based on internet of things are widely applicable to the technical field of agriculture.

The invention provides a method for overcoming continuous cropping and successive cropping obstacles of apple trees. The method for overcoming the continuous cropping and successive cropping obstacles of the apple trees comprises the steps that intermediate cutting is conducted, old tree roots in soil of an orchard are removed, soil is deeply ploughed, organic fertilizer is applied, and finally apple saplings are planted. According to the method for overcoming the continuous cropping and successive cropping obstacles of the apple trees, the amount of labor used is small, no chemical or biological agent is used, cost is low, the ecological environment is prevented from being destroyed, the method is suitable for apple orchards of any scales, the economic benefit is high, and the continuous cropping and successive cropping obstacles appearing during changing of the apple trees in an old apple orchard can be completely overcome.

The invention discloses a method for preparing phosphocholine chloride calcium salt tetrahydrate, which comprises the steps of (1) subjecting a choline chloride crude product and a phosphorylating agent to phosphorylation reaction to obtain a phosphocholine chloride mixture; (2) subjecting the phosphocholine chloride mixture and a calcium-source aqueous solution to replacement reaction to obtain a metathetical mixture; (3) subjecting the metathetical mixture to reduced pressure distillation to separate out solids and obtain a solid-liquid mixture; (4) crystallizing, filtering and drying the solid-liquid mixture at -10 to -1 DEG C to obtain phosphocholine chloride calcium salt tetrahydrate. The phosphorylating agent is selected from phosphoric acid and/or polyphosphoric acid. The calcium-source aqueous solution is one or more selected from calcium chloride aqueous solution, calcium carbonate aqueous solution, calcium hydroxide aqueous solution and calcium bicarbonate aqueous solution. The method is mild in environment condition, high in yield and high in product purity.

The invention provides a preparation method of human serum albumin and the human serum albumin. The preparation method of the human serum albumin comprises the following steps: I, extracting supernatant of a component IV from human plasma with a low-temperature ethanol method to serve as a raw material; II, performing fine-filtering treatment on the supernatant of the component IV; III, adjusting the pH of clear liquor obtained by fine-filtering treatment to obtain precipitate of a component V; IV, dissolving the precipitate of the component V and purifying to obtain finished human serum albumin. By adopting the preparation method, the prekallikrein activator content of the finished human serum albumin is lower than or equal to 12IU/ml, and the polymer content is lower than or equal to 2 percent. The preparation method has the advantages of easiness and convenience in operation and stable process in production and application, and the quality of a final product is higher than the national standard.

The invention relates to a purification method for obtaining high-purity recombinant human serum albumin. The method comprises the following steps: centrifugal ultrafiltration and secondary ultrafiltration are carried out after centrifuging and heating the fermentation liquid, the impurities encapsulated in the recombinant human serum albumin are then removed using 30% of alcohol and 6 of mol/L urea, the protein is renatured, eluted, and dialyzed to obtain the decontamination liquid, finally, the obtained decontamination liquid is sequentially subjected to cation exchange chromatography, anionexchange chromatography, and hydrophobic chromatography to obtain the high-purity recombinant human serum albumin. The recombinant human serum albumin obtained by the method has the advantages of high purity, less impurities, low degradation, high stability, and the like, and has the good application prospect. The final obtained recombinant human serum albumin reaches the level of pharmaceuticalgrade (the purity is greater than 99.999999%), which fully meets the requirements of the US Pharmacopoeia and the Japanese Pharmacopoeia for the injection-level recombinant human serum albumin.

The invention discloses a clean and high-conversion-rate preparing method of 2,2,2-trifluroacetophenone. The method includes the following steps of S1, making N,O-dimethylhydroxylamine hydrochloride as the raw material react with organic alkali to obtain free N,O-dimethylhydroxylamine; S2, making trifluoroacetic anhydride react with free N,O-dimethylhydroxylamine to generate N,O-dimethyltrifluoroacetamide; S3, making a Grignard reagent react with N,O-dimethyltrifluoroacetamide to prepare trifluroacetophenone, recovering N,O-dimethylhydroxylamine generated in the step S1, applying N,O-dimethylhydroxylamine to the step S2, and recycling the reaction solvents used in the steps S1, S2 and S3. By means of the preparing method, prepared high-nucleophilicity N,O-dimethyltrifluoroacetamide reactswith the Grignard reagent, 2,2,2-trifluroacetophenone is efficiently prepared, meanwhile produced byproducts can be applied for preparing N,O-dimethyltrifluoroacetamide, and a recycling effect is achieved.

The invention relates to the technical field of separation and extraction of bioactive substances, in particular relates to a clean production technique for the separation and the extraction of catalase, and provides an environment-friendly technique for the separation and the extraction of catalase. The technique can realize zero-discharge of waste water and waste residue during the process of processing and producing catalase and radically solve the environment pollution problem in the prior technique of processing and producing catalase without influencing the yield and quality of catalase. The technique is suitable for the processing and the production of catalase by using the raw material of the liver of various animals such as pig, cattle, ship, chicken, duck, goose, fish, etc after autolysis treatment, and is also suitable for the processing and the production of catalase by using the catalase-containing fermentation liquid obtained through the fermentation and the cultivation of microbe. According to the invention, taking pig liver as an example, 2 kg of catalase liquid (50,000 U/ml) can be prepared from 1 kg of pig liver, the water consumption is reduced to lower than 2.2 kg, and 230 g of the solid substances with protein content being higher than 60% can be obtained at the same time.

The invention discloses a coal slime classified concentration device which comprises a pool body, a bridge frame arranged on the top of the pool body, a rotating frame arranged in the pool body and a transmission device arranged at the upper part of the pool body and used for driving the rotating frame to rotate, wherein the center of the pool body is provided with a liquid-solid fluidized bed cylinder body the upper part of which is provided with a guide cylinder, the rotating frame is arranged on the outer part of the liquid-solid fluidized bed cylinder body, the liquid-solid fluidized bed cylinder body is internally provided with a concentration sensor connected with a controller, the lower part of the liquid-solid fluidized bed cylinder body is provided with a liquid distributor, a tapered guide groove is arranged below the liquid distributor, and a coarse particle bottom current discharging valve is arranged on a discharging hole of the tapered guide groove. The invention overcomes the defect of a concentrator used in first stage concentration in a coal slime two-concentrating and two-recycling process, and has the advantages of simple structure, small occupation area and lowcapital construction cost.

The invention discloses sodium 8-(2-hydroxylbenzamido)caprylate and a preparation method therefor and belongs to the field of preparation of compounds. A key of the technical scheme of the invention is as follows: the preparation method comprises the steps: mixing salicylic acid with tetrahydrofuran, adding N,N-carbonyl diimidazole, adding 8-amino ethyl caprylate hydrochloride, and dropwise addingtriethylamine; carrying out a concentrating reaction solution until no solvent is distilled off, adding dichloromethane for dissolving, and carrying out washing once separately with diluted hydrochloric acid, a saturated sodium carbonate solution and a saturated saline solution, so as to obtain an intermediate I; mixing a sodium hydroxide solution with the intermediate I, and carrying out stirring until solids are dissolved; cooling the temperature of a reaction solution to 10 DEG C or below, dropwise adding diluted hydrochloric acid, adjusting a pH value of a reaction solution to 4.5 to 5, and carrying out solid precipitation, so as to obtain free acids; and dissolving the free acids with isopropanol, dropwise adding a sodium hydroxide solution, carrying out a reaction for 1 to 1.5 hours, supplementing isopropanol, and continuing to carry out stirring for 1.5 to 2 hours. The method has the advantages that steps are few, the yield of each step is high, the product purity is good, impurities are more easily controlled, and raw materials are more readily available.

The invention provides an extraction method of morphine from opium. In the extraction method, the opium is taken as a main raw material, and the extraction method comprises the steps of heating and extracting aqueous solution, concentrating, performing paraffin solid-liquid extraction, removing impurities and the like so as to obtain morphine extract solution. By adopting the method, the impurities can be effectively removed, the yield is high, the preparation process is simple, the repeatability is high, the operability is good, the production cost is low, the energy consumption is low, and the industrialization is easy.

The invention relates to a method for recovering interferon from a polyethylene glycol modified interferon reaction liquid, belonging to the field of separating and purifying each component in the polyethylene glycol modified interferon reaction liquid. The method of the invention comprises the following steps: a, regulating the pH value of the polyethylene glycol modified interferon reaction liquid to 5.0-8.0 with acid or alkali; b, replacing the obtained reaction liquid into a sample loading buffer liquid with the same pH, regulating the ion strength of the sample loading buffer liquid, and carrying out ion-exchange chromatography so that the polyethylene glycol modified interferon penetrates and the dissociated interferon is absorbed; and c, after treating and regenerating the ion-exchange chromatography columns, eluting with low salt to obtain the eluting peak which is the recovered dissociated interferon. The method of the invention does not affect the yield and purity of PEG IFN, and simultaneously, each quality control index of the recovered IFN from the reaction liquid is consistent with a comparison product, and the IFN can be recycled.

The invention discloses a method for recycling phosgene in tail gas produced through a thermo-optical reaction for synthesis of 3,5-dichlorophenyl isocyanate. The method comprises steps as follows: a phosgene-toluene solution in a tail gas cooling pan is fed into a cold-light kettle, a 3,5-dichloroaniline toluene liquid in a dropping addition tank is dropwise added to the cold-light kettle, and phosgene I is introduced from the bottom of the cold-light kettle; a mixed solution is transferred into a thermo-optical kettle, and phosgene II is introduced from the bottom of the thermo-optical kettle until the toluene solution is transparent; gas produced in a reaction process enters a thermo-optical condenser, non-condensing gas is introduced into a thermo-optical tail gas buffer kettle and is heated to 80 DEG C, and the heated gas is introduced into the tail gas cooling pan; a condensed liquid in the thermo-optical condenser and a liquid in the thermo-optical tail gas buffer kettle are subjected to acid distribution treatment, a product is introduced into the thermo-optical kettle through a pipe, and reflux is formed; N2 is introduced from the bottom of the thermo-optical kettle in a reflux process for light repelling; a material is flirted by a filter device, then is introduced into an intermediate tank and is introduced into a next procedure through a pump P1.

The invention discloses a method for planting Bletilla striata in northern Hubei and belongs to the technical field of crop planting. The method includes the steps of S1, selecting seeds, to be more specific, selecting large and full tubers with many bud eyes and without damage and diseases from September to November, and dipping the tubers in plant ash to serve as planting seeds, wherein each tuber has 1-2 buds; S2, selecting a field and preparing soil, to be more specific, selecting sandy loam which is deep, fertile, loose, good in draining performance and rich in humus as the planting field; S3, planting, to be more specific, placing the planting seeds obtained in S1 into holes in a way that the bud eyes face upwards, and covering the holes with soil until the soil is parallel with theseed bed; S4, performing intertillage weeding; S5, using biological microbial fertilizer to perform top dressing for 3-4 times every year; S6, irrigating and draining; S7, controlling diseases and pests; S8, harvesting. By the scientific sowing and top dressing, the planted Bletilla striata is high in disease and pest resistance, high in yield and high in medicinal effect. In addition, the methodeffectively increase the mu yield of the Bletilla striata.

The invention belongs to the technical field of permanent magnetic ferrite materials, and discloses a dispersing agent for a permanent magnetic ferrite material as well as a preparation method and application thereof. The dispersing agent for the permanent magnetic ferrite material is prepared by mixing citric acid, ammonia water, sodium hydroxide and water, the mass concentration of the ammonia water is 20-30%, the mass ratio of the citric acid to the water to the ammonia water is 1: (0.7-1.3): (0.5-1.5), and the pH value of the dispersing agent is 4-7. The dispersing agent is a water-based dispersing agent which is autonomously synthesized from cheap industrial raw materials, can be applied to the preparation process of a permanent magnetic ferrite material, can effectively improve the comprehensive magnetic performance of the material, and basically does not influence the yield of a final product.

The invention discloses a high-frequency welding impedor. The high-frequency welding impedor comprises a cylindrical magnetic rod box and a magnetic rod arranged in the cylindrical magnetic rod box, and a baffle connected with one end of the magnetic rod box. The high-frequency welding impedor is characterized by further comprising a quick-changing connector connected with the other end of the magnetic rod box; the other end of the quick-changing connector is connected with a quick-changing water pipe; the magnetic rod box, the quick-changing connector and the quick-changing water pipe are communicated; the baffle is provided with a plurality of baffle through holes. With the adoption of the design, the quick-changing connector is used for connecting the magnetic rod box with the quick-changing water pipe, the magnetic rod box and the quick-changing water pipe can be conveniently and rapidly detached by the quick-changing connector when the magnetic rod is checked and exchanged, and a product does not need to be cut from the middle to form an opening, so that the yield of the product is not influenced and the production efficiency is improved.

The invention discloses a blowout prevention oil-well pump, and is characterized in that a pump barrel, a connecting pipe and an oil inlet valve are connected in sequence, an oil outlet valve is arranged on the lower part of a plunger, the inner diameter of the connecting pipe is greater than the inner diameter of the pump barrel, an elastic lock claw is arranged on the lower part of the oil outlet valve, an inner lock pipe is suspended on a shoulder of a strip body milled at the lower part of the elastic lock claw, an suspension surface is a conical surface, the strip body milled at the lower part of the elastic lock claw is coated by an outer lock sleeve, the outer lock sleeve is supported by a spring, after a blowout prevention valve ball is placed in the blowout prevention plunger, the blowout prevention plunger is connected to the lower part of the inner lock pipe, a pressure rod is arranged in the elastic lock claw, the blowout prevention valve ball is pressed by the lower part of the pressure rod, the upper part of the inner lock pipe is communicated with the lower part of the blowout prevention plunger, the outer diameter of the outer lock sleeve is great than the inner diameter of the pump barrel, the plunger drives the outer lock sleeve to move upwards to a shoulder surface formed by the pump barrel and the connecting pipe, the outer lock sleeve breaks away from the strip body milled at the lower part of the elastic lock claw, the strip body milled at the lower part of the elastic lock claw is expanded outwards under the action of axial force, so that the elastic lock claw and the inner lock pipe are separated, the pressure rod is lifted away along with the plunger, and the blowout prevention valve ball rises to block a channel of the blowout prevention plunger.

The invention discloses high-early-activity phosphorus slag powder and a preparation method thereof, and belongs to the technical field of inorganic cementing materials. The preparation method comprises the following steps: mixing phosphate ore, silica, coke and a glass body structure regulator to form a mixture, heating the mixture to 800-900 DEG C, keeping the temperature for 5-10 minutes, then continuously heating to 1300-1400 DEG C for co-melting, and carrying out water quenching treatment on molten slag after co-melting. The prepared phosphorus slag powder has the advantage of high early activity, the preparation method is simple, the energy consumption in the technological process is low, and the economic benefit of preparation is improved.

The invention belongs to the field of pharmaceutical chemistry and discloses a preparation method of ibuprofen-arginine. The preparation method is characterized by comprising the following steps of: under the conditions of room temperature and stirring, simultaneously dissolving ibuprofen and arginine in an alcohol-water solution by using the difference between solubility of the components, then adding a right amount of alcohol to clear reaction liquid, salifying and crystallizing. The preparation method has the advantages of simple preparation technology, mild reaction conditions, low cost, high yield, controlled quality and suitability for industrial production.

The invention belongs to the technical field of gelatin extraction, and particularly relates to a method for producing cow leather gelatin by using pickled raw leather. The method is realized through the following steps: depilating cow leather, cleaning and degreasing; stirring and soaking the degreased cow leather in a gradient sodium chloride triethanolamine aqueous solution, and filtering and cleaning the cow leather after soaking; adding the treated cow leather into a phosphate buffer solution containing lauryl sodium sulfate, adding acid protease and sodium diethylhexyl sulfosuccinate, carrying out enzymolysis, and carrying out enzyme passivation after the enzymolysis is finished; and cleaning the cow leather subjected to enzymolysis to be neutral, oscillating the sol, filtering to obtain a glue solution, centrifuging the glue solution, collecting supernatant, and performing freeze drying. According to an extraction method provided by the invention, the gelatin extraction rate can be increased, and the extracted gelatin is high in purity, conforms to the related standards of medicinal cow leather gelatin and is uniform in particle size; according to the method provided by the invention, the enzymolysis time can be shortened, but the gelatin yield is not influenced.

The invention discloses a clinical application-grade adipose-derived stem cells and a preparation method thereof. The preparation method comprises the following steps: carrying out primary culture onseparated adipose-derived stem cells, digesting, subculturing and screening out cells with cell clone groups, and carrying out subculturing inoculation. The adipose-derived stem cells prepared by themethod disclosed by the invention are high in nucleated cell yield, short in separation time and high in cell survival rate, and the passage can reach more than 10 generations.

The invention discloses an industrial material grinding mechanical device. The industrial material grinding mechanical device comprises a support frame, a material collecting box, a material outlet and a sound isolation layer, wherein a box body of a material grinding machine is arranged on the support frame; the sound isolation layer is arranged at the outer side of the box body of the material grinding machine; the upper end of the box body of the material grinding machine is provided with a material adding port; a material grinding roll is arranged in the box body of the material grinding machine; a grinding ring is arranged on the material grinding roll; rotary shafts are arranged at both ends of the material grinding roll; a motor is arranged at one end of each rotary shaft, and is connected with the corresponding rotary shaft through a coupling; a bearing is arranged on each rotary shaft; a shaft sleeve is arranged at one side of each bearing; a protective cover is arranged at the outer side of each motor. The industrial material grinding mechanical device has the beneficial effects that the material is ground under the cooperation function of the material grinding rolls andthe grinding ring, the material is fully ground by the grinding ring under the action of centrifugal force, and the quality of the ground material is uniform; by arranging the sound isolation layer and a dustproof cover on the material grinding machine, the noise pollution and dust pollution are effectively reduced, and the environment-friendly effect is realized.

The invention relates to a method for treating methanol protein comprehensive wastewater to effectively solve the problems that wastewater treatment can not meet the standard, the utilization efficiency of equipment is low, and recycling can not be achieved. According to the method, flushing wastewater A generated from methanol protein production is centrifuged to obtain heavy-phase sediment C and light-phase liquid D; the light-phase liquid D is subjected to ultrafiltration and concentration, and then separation is conducted to obtain concentrated solution E and clear liquid F; the heavy-phase sediment C and the concentrated solution E are mixed to serve as the raw material for making organic fertilizer; the clear liquid F is mixed with wastewater B generated from methanol protein extraction aftertreatment for reverse osmosis treatment and concentration, so that desalted water G and water H high in salinity and ammonia and nitrogen content are obtained. By the adoption of the method, recycling and zero discharge of wastewater are achieved, usage of inorganic salt is reduced greatly, production cost is reduced for enterprises without affecting the growth of yeast cells and the yield of methanol protein, and production efficiency and economic benefits of enterprises are improved.

The invention relates to the technical field of clubroot prevention and control, and discloses a method for rapidly reducing clubroot harm in a farmland. The method comprises the following steps: S1,seedling field preparation is conducted, specifically, a field parcel with serious clubroot is selected, plowing is conducted after removing weeds, and a fertilizer required by soybeans is applied before sowing; S2, soybeans are planted, specifically, soybean seeds are selected, and the soybeans are uniformly sowed between May 10th and May 15th; S3, plowing and re-planting are conducted, specifically, after 35-55 days, the grown soybean plants are smashed, plowing is conducted, and the soybeans are uniformly sowed again; and S4, harvesting is conducted timely, specifically, the soybeans are harvested between September 10th and September 15th. According to the method, the soybeans are continuously planted twice, and the respective planting time, growth time and treatment modes of the soybeans in two seasons are limited, so that the bacterial source amount of soil is reduced, the available soil quantity is rapidly increased, clubroot dormant spore propagation is prevented, and meanwhile,the effects that the yield of cruciferous crops such as oilseed rape is not influenced, and the cost is low are achieved.

The invention discloses a method for preparing maltol and a homologue thereof by regulating and controlling a chlorination-hydrolysis reaction. According to the method, by regulating and controlling the chlorination reaction process, the polymerization reaction under the acidic condition of alpha-furanidine is inhibited, the conversion rate of a main reaction is increased, and a target product with high yield is obtained. By adopting the preparation method, the yield of the prepared methyl maltol and the yield of ethyl maltol reach 80% or above, and the generation of byproducts is greatly reduced.

The invention provides a high-low staggered cultivation method for pods of oilseed rapes. Short oilseed rapes and high oilseed rapes are uniformly sown on the same field; the plant number of the high-stalk rape accounts for 5%-20% of the plant number of the short-stalk rape; in the mature period, the plant height of the short-stem oilseed rape is not higher than 1.2 m, and the plant height of the high-stem oilseed rape is not lower than 1.5 m; the growth heights of all siliques of the high-stalk oilseed rape are higher than those of all siliques of the short-stalk oilseed rape. According to the method, by selecting the plant height difference of the high-stalk oilseed rape and the short-stalk oilseed rape in the mature period, the growth height of all siliques of the high-stalk oilseed rape is higher than that of all siliques of the short-stalk oilseed rape, the upper-layer space of the oilseed rape planting land is fully utilized, and the yield of the short-stalk oilseed rape is increased on the premise that the per unit yield of the short-stalk oilseed rape is basically not affected. The yield per unit of the high-stalk rape becomes the yield which is directly increased in unit area, so that the yield per unit of the rape is quickly increased.

The invention discloses an extracting and energy-saving system for L-tryptophan. The system comprises a fermentation liquid storage tank, a ceramic membrane filter and a clear liquid tank which are sequentially connected by virtue of a pipeline, wherein the fermentation liquid storage tank is connected with a dialysis water adding device and is further provided with an L-tryptophan concentration detection opening; the ceramic membrane filer is provided with a controller which is used for controlling operation of the filter according to concentration of L-tryptophan. The bottom of the fermentation liquid storage tank is further connected with a mushroom dreg tank by virtue of a centrifugal pump, the mushroom dreg tank is internally filled with a flocculation agent and is communicated with the plate-and-frame filter press by virtue of the mushroom dreg tank, and a filtrate discharge pipe of the plate-and-frame filter press is connected and communicated with the top of the fermentation liquid storage tank. The system can be used for effectively shortening the operating time of the ceramic membrane, improving the tank-loading batch for fermentation, lowering the production cost and reducing the quantity of wastewater effluent.