31results about How to "Save the recycling process" patented technology

The invention discloses a synthetic method for gel-based water-retained slow-release urea fertilizer, mainly comprising the following steps: 1) acrylic monomer is neutralized with 20% potassium hydroxide solution, obtaining a mixed monomer solution with twenty-five percent neutralization degree; 2) the mixed monomer solution is gauged and added into an aqueous urea, forming a polymerization mixed liquid; 3) a cross-bonding agent is added on the condition of heat-preservation stirring, and then a radical initiator is added after agitating the awaiting cross-bonding agent to dissolve; 4) a water gel is generated when the of polymerization is generated on the condition of heat-preservation stirring; 5) the gel-based water-retained slow-release urea fertilizer is crushed, dried, grinded, screened and packed. The synthetic method for gel-based water-retained slow-release urea fertilizer has the advantages of no-use of organic solvent, no solvent recovery problem, simple craft and lower cost.

The invention relates to a method for producing aqueous polyurethane synthetic leather for costume by using a physically-foamed pore forming coating technology. According to the present invention, a physically-foamed polyurethane coating dry film transferring process replaces the original solvent-based polyurethane wet coagulation coating process, such that the problems of pollution and residue of the DMF solvent are solved; with adopting the aqueous polyurethane dry film transferring process to replace the solvent-based polyurethane dry film transferring process, the solvent pollution problem during the production process is eliminated; the synthetic leather for the costume is washed in hot water, the pore forming agent is lixiviated by the hot water, such that the penetrating pores are formed in the aqueous polyurethane coating of the synthetic leather, the water vapor permeability and the air permeability of the synthetic leather for the costume are improved, and the synthetic leather with the good-sanitary property is obtained; with the method, the DMF solvent recovery apparatus and the DMF solvent recovery process are saved, the production cost is reduced, and the technical process is simplified; when the conventional physical properties and the conventional mechanical properties are met, the water vapor permeability of the synthetic leather for the costume is more than or equal to 1.6 mg / cm<2>.h, and the air permeability of the synthetic leather for the costume is more than or equal to 2500 ml / cm<2>.h.

The invention relates to a processing technology of a spinning belt pulley with inner and outer lug bosses, which belongs to the field of manufacturing belt pulleys. The processing technology comprises the following steps of: stamping and performing a blank, reprocessing the performed blank and spinning the reprocessed and performed blank, wherein the reprocessing step of the performed blank comprises the following steps of: cold extruding a formed blank A into a performed blank B with a predetermined size; and rolling and forming the performed blank B by a spinning mode to form the performed blank C with inner and outer lug bosses. Compared with the traditional processing technology, the processing technology of the spinning belt pulley with the inner and outer lug bosses has wide source of raw materials, low cost, high production efficiency and low rejection rate, the spinning mode is used for replacing a stamping mode to produce the blank with the inner and outer lug bosses, products are not easy to deform, the dimensions of the product can achieve higher required precision, and an adopted spinning machine has small erosion, low power consumption and convenient maintenance.

The invention provides a production method for waterborne polyurethane synthetic leather wet process impregnated bass, comprising the following steps of: preparing impregnation liquid by using waterborne polyurethane, filler and water; preparing solidification liquid by mixing a demulsification cross-linking agent with water; saturating a non-woven fabric by the impregnation liquid through an impregnation groove, and extruding some impregnation liquid in the non-woven fabric by a pair of rollers; enabling the non-woven fabric with the impregnation liquid to pass through a solidification groove filled with a coagulating agent to form porous filler by the waterborne polyurethane coagulated by the coagulating agent and the filler, and filling the filler in the non-woven fabric; and washing by water, extruding water and drying to obtain the waterborne polyurethane synthetic leather wet process impregnated bass. The product produced by the invention has the extremely similar microcellular structure, and is better in physical and mechanical properties, water vapor penetration performance, and hand feel characteristic. According to the production method, the solvent pollution problem of DMF (dimethyl formamide) and the product safety problem caused by the residue of the DMF in the production of solvent type polyurethane wet process impregnated bass can be solved.

The invention provides a method for preparing O, -O diethyl-O-(3, 5, 6-trichloro-2-pyridyl) thiophosphate, comprising the following steps: O, -O diethyl thiophosphoryl chloride is added into the mixed solution of 3, 5, 6-trichloropyridine-2-ethanol-sodium and water in a dripping way at the temperature of 45-70 DEG C under the condition that a catalytic amount of phase transfer catalyst exists for reaction, and then the target product which is dursban is collected from resultant of reaction; the pH value of a reaction system ranges from 10 to 12, the phase transfer catalyst is a multivariant compound phase transfer catalyst which is formed by 4-dimethylamino naphthyridine and more than one of trialkyl phenmethyl ammonium halide, tetra-allkyl ammonium halide, triethylene diamine or 4-methyl drewamine. The method adopts water as solvent, eliminates the recycling process of organic solvent, is simple and safe to operate, has little waste water, is easy to process and has high yield and product purity.

The invention discloses a method for preparing N-ethyl-N-hydroxyethylaniline. The method comprises the following steps: by taking N-ethylaniline and ethylene oxide as raw materials, in the absence ofa solvent, under catalysis of taurine, performing programmed heating, directly synthesizing N-ethyl-N-hydroxyethylaniline, cooling, and discharging, thereby obtaining a finished product. The method iseasy in raw material obtaining, good in atom economy, gentle in reaction condition, green and environment-friendly, simple and efficient and applicable to industrial production.

The invention discloses a high-crush-resisting rapid degradation magnesium alloy and a preparation method thereof. The alloy is prepared from, by mass percent, 5.0-10wt% of Zn, 1.20-6.0wt% of Cu, 1.50-3.0wt% of Ni, 1.50-5.0wt% of Nd, 0.5-1.5wt% of Ca and the balance Mg and the other impurity elements. According to the high-crush-resisting rapid degradation magnesium alloy and the preparation method thereof, Cu, Nd, Ca and other alloy elements are added to improve the crush resistance of a material, and the degradation rate is increased through Cu and Ni. According to the prepared high-crush-resisting rapid degradation magnesium alloy, the corrosion rate in a 3% KC1 solution at the temperature of 25 DEG C can reach 7.4 mg cm<-2>h<-1>, and the corrosion rate in the 3% KC1 solution at the temperature of 93 DEG C can reach 88 mg cm<-2>h<-1>; and high crush resisting strength is achieved, and the high-crush-resisting rapid degradation magnesium alloy and the preparation method thereof are suitable for the field of shale gas extraction with a rapid corrosion requirement.

The invention provides a production method of protein synthetic leather based on salt coagulation and solidification. The production method comprises the following steps that (1) an impregnating liquid is prepared, 60-85 parts of water soluble protein and 15-40 parts of anionic stuffing agent by mass are added into a stirring kettle for uniform mixing; (2) a coagulating liquid is prepared, 20-30 parts of coagulation agent, 1-3 parts of cross-linking agent, 3-8 parts of formic acid and 50-66 parts of water by mass are added into the stirring kettle for stirring and mixing; (3) a protein / nonwoven cloth complex is prepared; nonwoven cloth passes through an impregnating groove containing the impregnating liquid; the nonwoven cloth with the impregnating liquid passes through a coagulating groove with the coagulating liquid; and the post-treatment is conducted. According to the production method, a solvent DMF (dimethyl formamide) is not required in the whole production process; a production working environment is safe; the environmental pollution is not caused; and the produced protein synthetic leather has good physical and mechanical properties, breathability, moisture permeability, moisture absorption and removal properties and dyeing property.

The invention relates to the technical field of lithium carbonate production, in particular to a method for preparing lithium carbonate through thermal reduction by taking alpha-type spodumene as a raw material. The method comprises the following steps: mixing alpha-type spodumene concentrate powder with a reducing agent and a flux inhibitor, carrying out reducing in a reduction furnace under vacuum and high-temperature conditions to reduce lithium in spodumene into metal lithium steam, and condensing to obtain metal lithium and reduced spodumene slag containing the metal lithium and lithium oxide; leaching spodumene slag containing metal lithium and lithium oxide with water to obtain leached slag and slurry; and precipitating the leaching residues and the slurry, removing calcium, filtering to obtain a filtrate which is a lithium carbonate raw material solution, and concentrating and precipitating lithium to produce a battery-grade or high-purity lithium carbonate product. The new method is a green and environment-friendly technology, production of high-risk chemical chlorine and use of sulfuric acid in the prior art are avoided, and the environmental load is small; environmental pollution and solid waste emission are avoided, the environmental benefit is high, and the safety is high.

The preparation process of 2-thiothiazoliidone includes the steps of: forming saturated ammonia-alcohol solution, reaction of ammonia and carbon bisulfide to produce ammonium dithiocarbamate, further reaction with chloracetate to obtain clear condensate liquid, mixing with acid solution through stirring to react to produce crystal, separating and purifying to obtain product. The present invention uses ammonia-alcohol solution, rather than ether, as the solvent and pure water, rather than methanol, for purifying coarse product, and has lowered production cost, improved work environment, environment friendship and other advantages.

The separation and purification method of dodecanedioic acid includes the following steps: decolouring the fermenting liquor in which the organism is fermented with active carbon, filtering, adding chitosan and ethylene diamine tetraacetic acid into the filtrate, making them combine with impurity being in fermenting liquor to form suspended matter, microfiltering to remove the suspended matter, ultrafiltering and further removing impurity to make purification, then adding acid in the filtrate to make dodecanedioic acid precipitate, filtering and drying so as to obtain the dodecanedioic acid product.

The invention discloses a novel fuel cell stack with inlet gas multistage self-preheating and a control method, the novel fuel cell stack comprises an inlet manifold, the inlet manifold comprises an anode gas inlet flow channel and a cathode gas inlet flow channel which are respectively arranged at two sides in the stack; a cooling liquid outlet flow channel is arranged on the periphery of the air inlet manifold in a surrounding mode, and a sleeve type air inlet manifold is formed. And the cooling liquid and the air inlet fluid flow in opposite directions to form counter-flow type convection heat exchange. The hydrogen and oxygen inlet gas is subjected to multi-stage preheating in the galvanic pile, the inlet gas temperature preheating target under different working conditions can be achieved, devices and power consumption required for heating the inlet gas outside the galvanic pile are reduced, a fuel cell system is more portable, and the total efficiency of a fuel cell is improved through step-by-step utilization of waste heat of cooling liquid.

The invention relates to the technical filed of preparation of organic intermediates, and in particular relates to a method for preparing 2, 6-bis-(picrylamino) pyridine. The method comprises the following steps: with picrylamino and 2, 6-diaminopyridine as raw materials, water as a medium, and NaHCO3 as a reaction promoter, reacting for 2 to 6 hours at the temperature of 83 to 90 DEG C in the presence of a phase transfer catalyst; and filtering, washing by hot water and recrystallizing by methanol to obtain the 2, 6-bis-(picrylamino) pyridine. According to the method, single water is used as the reaction medium to replace an organic solvent adopted by an existing technology, and the phase transfer catalyst is adopted to reduce interfacial tension and improve activity of the reaction; the picrylamino and the 2, 6-diaminopyridine are reacted under the condition being close to a theoretical material ratio so as to reduce consumption and cost of raw materials; the solvent recovery and separation process is simplified, and the pollution to the environment is reduced.

The invention relates to a method for producing aqueous polyurethane synthetic leather for costume by using a physically-foamed pore forming coating technology. According to the present invention, a physically-foamed polyurethane coating dry film transferring process replaces the original solvent-based polyurethane wet coagulation coating process, such that the problems of pollution and residue of the DMF solvent are solved; with adopting the aqueous polyurethane dry film transferring process to replace the solvent-based polyurethane dry film transferring process, the solvent pollution problem during the production process is eliminated; the synthetic leather for the costume is washed in hot water, the pore forming agent is lixiviated by the hot water, such that the penetrating pores are formed in the aqueous polyurethane coating of the synthetic leather, the water vapor permeability and the air permeability of the synthetic leather for the costume are improved, and the synthetic leather with the good-sanitary property is obtained; with the method, the DMF solvent recovery apparatus and the DMF solvent recovery process are saved, the production cost is reduced, and the technical process is simplified; when the conventional physical properties and the conventional mechanical properties are met, the water vapor permeability of the synthetic leather for the costume is more than or equal to 1.6 mg / cm<2>.h, and the air permeability of the synthetic leather for the costume is more than or equal to 2500 ml / cm<2>.h.

The invention discloses environment-friendly water-based synthetic leather which sequentially comprises a surface layer, a middle layer and a base layer from outside to inside, the surface layer is obtained by coating water-based slag surface layer slurry; the middle layer is a one-layer bonding layer or two-layer foaming layers or a one-layer foaming layer and a one-layer bonding layer; the foaming layer is obtained by coating a water-based slag foaming layer; the bonding layer is obtained by coating water-based slag bonding layer slurry; the water-based residue is prepared by grinding coffee residues, dry flower residues and other domestic waste residues through low-temperature liquid nitrogen, adding water-based polyurethane resin and then carrying out high-speed shearing dispersion. One of the purposes of the invention is to provide the environment-friendly water-based synthetic leather which can effectively and repeatedly utilize waste residues in life and has no potential chemical hazard to a user, and the other purpose of the invention is to provide the production process of the environment-friendly water-based synthetic leather.

The invention discloses a method for comprehensively recycling a vanadium-titanium series denitration spent catalyst. The spent catalyst and sodium carbonate are mixed and subjected to high-temperature roasting, then obtained high-temperature melt is subjected to water quenching, and a glass body is manufactured; the glass body is subjected to fine grinding and then water leaching, and filter liquid and filter slag are obtained after filtering; and the filter liquid is used for extracting vanadium oxide, tungsten oxide and molybdenum oxide, and the filter slag is used for preparing titanium dioxide. By means of the method, valuable elements in the spent catalyst are completely recycled, in addition, the obtained product can be directly returned to be used for preparing of the denitration catalyst, various elements can be recycled at the same time, and especially, the titanium element can be recycled. By means of the method, a titanium dioxide product can be directly obtained finally, the purity of the titanium dioxide product can reach 99.0% or above, the process of sulfuric acid method recycling is omitted, and the method has the beneficial effects that the technology is environment-friendly, the comprehensive recycling cost is low, and the product value is high.

The invention discloses a material cutting system for empty capsule production, which comprises a rack, a sorting device and a cutting device, the sorting device comprises an index plate capable of gradually and circumferentially rotating, a material turning mechanism and a material ejecting mechanism, and a plurality of groups of material placing holes for placing capsule shells are circumferentially distributed in the index plate; the material ejecting mechanism comprises a first ejector pin set and a second ejector pin set which can synchronously and horizontally rotate by 180 degrees, the cutting device comprises a transferring disc capable of rotating by 180 degrees and a cutting knife capable of rotating in the circumferential direction, the first ejector pin set is used for ejecting inverted capsule shells in the material containing holes to fall to the material overturning mechanism, and the material overturning mechanism is used for overturning the inverted capsule shells to be upright. The second ejector pin group is used for ejecting and conveying the capsule shells which are positively arranged in the material placing hole and the positively arranged capsule shells in the material turning mechanism to fall to the transfer disc; and the transfer disc is used for conveying the capsule shells to a cutting position so as to be cut by the cutting knife. The capsule cutting device is beneficial to improving the cutting yield, simplifying the cutting procedure and greatly improving the capsule production efficiency.

The invention relates to a water accommodating tool, and provides a disposable water bag, which can prevent a water body in a bucket from being influenced by the outside environment, and a processing method for the disposable water bag. The disposable water bag is provided with a bag body, a bag plug and a plug cap, wherein the bag body is provided with an outer layer, a middle layer and an inner layer. The processing method comprises the following steps of: compounding a polyethylene terephthalate (PET) film and a protactinium (PA) film by glue, and solidifying the compound at constant temperature to obtain a PET and PA compound film; compounding the PET and PA compound film and a polyethylene (PE) film by glue, and solidifying to obtain a PET, PA and PE compound film; making a bag by using the compound film by a bag making machine to form the bag body; performing injection molding to make the bag plug, and performing secondary injection molding on the outer wall at the lower end of the bag plug to form a compound layer; thermally adhering the bottleneck of the bag opening of the bag body to the outer wall at the lower end of the bag plug; filling water, sealing compactly, and detecting whether the water bag leaks water by using a pressure machine; performing injection molding on a threaded body and a movable plug of the plug cap, assembling the threaded body and the movable plug to form a whole, and arranging a sealing gasket; and folding the disposable water bag, putting into a packaging box, and matching the plug cap.

The invention discloses a preparation method of a catalyst and belongs to the field of preparation and application of catalysts. The preparation method comprises the following steps of: a) in the presence of inert gas, mixing acetylacetone, cobalt hydroxide, benzene and / or benzene derivative, then distilling moisture until the moisture content of reflux is less than 300ppm, so as to obtain a solution A containing cobalt acetylacetonate, and cooling to the temperature below -10 DEG C for later use; b) in the presence of inert gas, mixing cyclopentadiene, 1,5-cyclooctadiene, benzene and / or benzene derivative, cooling to the temperature below -10 DG C, adding triethyl aluminum, and uniformly mixing, so as to obtain a solution B is obtained; and c) slowly adding the solution B into the solution A at the temperature below 0 DEG C, stirring, heating to 25 DEG C, reacting for 3-5 hours, and filtering, wherein the obtained filtrate is the catalyst benzene and / or benzene derivative solution of 1,5-cyclooctadiene cyclopentadienyl cobalt. The invention also discloses a method for preparing 2,2-dipyridyl by utilizing the catalyst.

The invention discloses a method for rapidly determining high dietary fiber rice. The method comprises the following steps: (1) taking polished rice grains and cooking; (2) sequentially removing fat, protein and starch in the cooked rice grains by organic solvent extraction, protease hydrolysis and amylase hydrolysis to obtain residue; (3) by observing the form of the residue with the naked eyes, determining that the residue which can retain the intact grain form is high dietary fiber rice, and the residue which becomes white loose floccules without a grain structure is low dietary fiber rice, wherein the dietary fiber content of the high dietary fiber rice is more than or equal to 5 percent. The cooked polished rice grains are taken as a study object, the fat, the protein and the starch in the rice grains are removed by a relatively mild treatment method, and the content of the dietary fiber in the rice is determined by the appearance form of the rice grains; the method not only is simple and efficient, but also the results are accurate.

The invention discloses a production process for synthesizing tricyclazole by using a solid super acid. The process takes an intermediate 4-methyl-2-hydrazinobenzothiazole as a raw material, formic acid as a ring-closing agent, chlorobenzene as a solvent, and the solid super acid as a catalyst for synthesizing the tricyclazole, wherein the solid super acid is perfluorosulfonic acid resin. The process comprises the following steps: mixing 4-methyl-2-hydrazinobenzothiazole with chlorobenzene, then adding formic acid, conducting heating for refluxing until the 4-methyl-2-hydrazinobenzothiazole iscompletely converted into an oximido intermediate; then adding the solid super acid, conducting refluxing for dehydrating, when the reaction reaches the end point, filtering out the solid super acidwhile the system is hot, then removing the solvent from the mother liquor, adding water for crystallization, conducting cooling, filtering, water washing and drying to obtain the tricyclazole. The production process disclosed by the invention creatively introduces the solid super acid as the catalyst, and uses a slight excess of formic acid to efficiently synthesize the tricyclazole, thereby increasing the utilization rate of formic acid from 10% to 70% or more, and greatly improving the utilization rate of formic acid.

The invention discloses a method for rapidly determining high dietary fiber rice. The method comprises the following steps: (1) taking polished rice grains and cooking; (2) sequentially removing fat, protein and starch in the cooked rice grains by organic solvent extraction, protease hydrolysis and amylase hydrolysis to obtain residue; (3) by observing the form of the residue with the naked eyes, determining that the residue which can retain the intact grain form is high dietary fiber rice, and the residue which becomes white loose floccules without a grain structure is low dietary fiber rice, wherein the dietary fiber content of the high dietary fiber rice is more than or equal to 5 percent. The cooked polished rice grains are taken as a study object, the fat, the protein and the starch in the rice grains are removed by a relatively mild treatment method, and the content of the dietary fiber in the rice is determined by the appearance form of the rice grains; the method not only is simple and efficient, but also the results are accurate.

The invention relates to a method for preparing a ternary polyacrylonitrile copolymer applicable to a carbon fiber precursor; the method comprises the steps: under the protection of nitrogen gas, mixing acrylonitrile, itaconic acid, dispersant and water and heating to 60-75 DEG C; dropwise adding initiator aqueous solution and acrylamide aqueous solution in sequence; after dropwise adding, timing and reacting for 3-24h, washing, denitrifying, filtering, drying and obtaining the ternary polyacrylonitrile copolymer. A water-phase suspension polymerization process is adopted to polymerization; the polymerization heat is easy to be removed and the polymerization temperature is easily controlled; the average molecular weight of the ternary polyacrylonitrile copolymer is higher and the molecular weight distribution is narrow; the prepared ternary polyacrylonitrile copolymer is capable of effectively improving thermal stability performance at a high-temperature pre-oxidation stage and has certain actual application prospects.

The invention discloses a method for preparing a COFs@HPAN nanofiltration composite membrane. COFs and a meltable PAN-based copolymer are fully blended by a high-speed mixing technology to prepare a uniformly distributed COFs-PAN masterbatch, and then the COFs with a uniform distribution are prepared. COFs-PAN blend membrane, and then through three levels of cross-linking in sequence to obtain COFs@HPAN nanofiltration composite membrane. In this method, by adjusting the process parameters of hydrolysis, irradiation and pre-oxidation reaction, the COFs-PAN blend film is processed by hydrolysis-irradiation-pre-oxidation reaction in sequence, and a multi-level adjustable network cross-linked structure can be constructed. According to the needs of different purposes, the network cross-linking structure of the nanofiltration composite membrane can be adjusted to achieve different pore sizes, so as to achieve the functions of efficient decolorization, desalination and virus removal. The prepared asymmetric structure COFs@HPAN nanofiltration composite membrane has excellent permeability and selectivity, high porosity, uniform pore size distribution, excellent thermodynamic stability, chemical resistance, and cycle stability, and can be applied in harsh water environments Separation and purification.

The invention belongs to the field of pesticide synthesis, and in particular relates to a preparation method of 1-naphthaleneacetic acid. The method specifically comprises: adding naphthalene and chloroacetic acid into a reactor for reaction to obtain a mixture containing 1-naphthaleneacetic acid and excess chloroacetic acid; performing solid-liquid separation on the mixture to obtain 1-naphthaleneacetic acid and a mother liquor; the mother liquor circulation To the above reaction; when the naphthalene is fed, it is in a molten liquid state, and the chloroacetic acid is in a gaseous state. The method for continuously producing 1-naphthaleneacetic acid of the present invention greatly reduces the generation of by-products, solves the problem of excessive chloroacetic acid recovery, is highly efficient and environmentally friendly, saves complicated separation steps, greatly reduces production costs, and is suitable for large-scale continuous production. Production of 1-naphthylacetic acid.

The invention relates to a preparation method for a ternary polyacrylonitrile copolymer for precursor fibers of carbon fibers. The preparation method comprises the following steps: under a nitrogen protecting condition, mixing a first monomer acrylonitrile, a second monomer acrylamide and a third monomer methacrylic acid with water; raising the temperature to 55-75 DEG C; then successively dropwise adding a chain transfer agent aqueous solution, a reducer aqueous solution and an oxidant aqueous solution; carrying out a timed reaction for 1-6 h after dropwise addition; and carrying out washing,monomer removing, filtration and drying to obtain polymer powder. The copolymer is polymerized by means of a water phase precipitation polymerization method. The polymerization reaction heat is easyto remove, the polymerization temperature is easy to control, and the relative molecular mass and distribution of the polymer are relatively uniform. The ternary polyacrylonitrile copolymer prepared by the method can improve the heat stability of the copolymer in a pre-oxidizing stage and has a certain actual application prospect.