32results about How to "Avoid flammable" patented technology

The invention relates to a neutral blockage removing agent composition used for an oil recovery formation in an oilfield. The neutral blockage removing agent composition is prepared from the following raw materials in parts by weight: 10-14 parts of polyepoxysuccinic acid amine, 35-40 parts of diethylenetriaminepentaacetic acid amine, 33-37 parts of hydroxyl succinic acid amine, 20-25 parts of polyacrylamide, 7-10 parts of sodium polyaspartate, 10-14 parts of sodium gluconate, 10-15 parts of activated clay, 20-25 parts of potassium peroxodisulfate, 9-11 parts of hydroxyl butanedioic acid amine, 4-7 parts of sodium salicylate, 5-9 parts of hexamethylene tetramine, 0.2-0.3 part of vanadium pentoxide, 2-5 parts of starch, 5-8 parts of alpha-sulphonated fatty acid methyl ester and derivative thereof (MES) and 0.1-0.3 part ofdiethyl ethanolamine. The neutral blockage removing agent composition is used for the blockage removal of an oil pumping well and a screw pump well in the oilfield, can effectively solve the problems of cleaning blockage removal of the oil pumping well and the screw pump well in the oilfield and the corrosion of oil recovery equipment, has high blockage removing speed, is neutral and is free of corrosion; waste liquid for blockage removal can be degraded and does not need to be discharged onto the ground to be subjected to sewage treatment, no corrosion, dead angle, precipitation or secondary well blockage are generated, and more safety and more reliability are realized as compared with traditional pickling blockage removing, biological blockage removing and solvent blockage removing.

The invention provides a method for synthesizing o-phenylenediamine from ortho-nitroaniline by virtue of catalytic hydrogenation. The method comprises the following steps: firstly, adding ortho-nitroaniline and a palladium-carbon catalyst into a high-pressure reaction kettle, introducing nitrogen to exhaust air in the kettle, and then introducing hydrogen to exhaust nitrogen in the kettle; secondly, heating and introducing hydrogen, performing catalytic hydrogenation reduction reaction under the conditions that the temperature is 110 DEG C and the pressure is 1.0MPa, reacting for 7-8 hours, then stopping introducing hydrogen, water-cooling, then filtering to recycle the catalyst, and collecting a filtrate after filtration to obtain o-phenylenediamine. According to the method provided by the invention, a raw material namely ortho-nitroaniline is subjected to direct hydrogenation without using a solvent, so that the consumption of the solvent can be greatly reduced, the after-treatment energy consumption can be saved, and large-sized solvent steaming equipment can be saved; and by adopting the method, a separation process can be simplified, the equipment investment, separation energy consumption, material consumption and environmental pollution can be reduced, and the system productivity and production safety can be improved.

The invention discloses a novel straw insulation board, and the straw insulation board is prepared from the following raw materials in parts by weight: 40-80 parts of straw, 5-20 parts of epoxy glue, 1-10 parts of univalent dihydric phosphate powder, 3-20 parts of metallic oxide powder, 0.5-5 parts of borate powder, 3-6 parts of jade powder, 8-12 parts of pearlite, 5-10 parts of modified kaolin and 30-50 parts of water. The straw insulation board comprises a core material layer and a cladding layer, the core material layer is mainly prepared by press-forming the epoxy glue, the jade powder, the pearlite and the straw, the surface cladding layer is obtained by mainly uniformly cladding an inorganic cementing material with an adhesion effect on the surface layer of the straw board, and therefore, the novel straw insulation board using the straw as a board is obtained. The novel straw insulation board has excellent performances of fast forming, preserving heat and insulating, flame retarding, mould proofing and high strength, and has a clear market prospect whether being applied to the building field or other related fields in future.

There is provided a composition of refrigerant mixtures for high back pressure condition, comprising propane, propylene or 1,1-difluoroethane and, optionally, additive selected from the group consisting of carbon dioxide, trifluoromethyl iodide and mixture thereof. The composition according to the present invention is environment-friendly and can be directly drop in the conventional refrigerator system adopting HCFC-22 refrigerant without any systemic change.

The invention discloses an agriculture straw regeneration fire-proof heat preservation plate material. The agriculture straw regeneration fire-proof heatpreservation plate material comprises raw materials, by weight, 60-80 parts of agriculture straw, 10-15 parts of binder, 3-6 parts of metal oxide, 3-7 parts of water-proof agent, 3-5 parts of fire retardant, 15-20 parts of modified kaolin, 12-18 parts of white cement and 20-26 parts water. The agriculture straw regeneration fire-proof heat preservation plate material has the excellent properties of rapid prototyping, heat insulation and heat preservation, inflaming retarding, mould proof, deliquescence resistance, high strength and the like, the plate material is divided into a pressed inner core and an outer surface coating layer, the problems of being prone to breaking billet, sticking plate and demoulding are solved, continuous production is achieved, and the production efficiency is improved greatly; and meanwhile, the source of the main raw materials of the agriculture straw regeneration fire-proof heat insulation plate material is wide, the cost is low, the technology is simple and clear, and the high practical value and the good application prospect are achieved.

The invention provides a preparation method of an AlN particle enhanced Mg-Al based composite material. The preparation method comprises the following steps: weighing magnesium powder, aluminum powder, AlN powder and stearic acid and putting all the weighed materials into a nylon ball milling jar with argon protection, putting the nylon ball milling jar on a roller grinding machine for long-time ball milling mixing at a low speed to obtain an evenly mixed powder, next, pressing the evenly mixed powder into a prefabricated block green body by virtue of bidirectional pressurization in a steel mold, and finally, putting the green body into a graphite crucible, loading the graphite crucible in a vacuum sintering furnace, pre-vacuumizing the sintering furnace, and then introducing argon and heating for sintering under the argon protection. The AlN particle enhanced Mg-Al based composite material prepared by use of the preparation method is even in distribution, high in density, excellent in interface bonding, and good in mechanical and physical properties; and meanwhile, the danger caused by easy combustion of the high-activity magnesium powder during high-energy ball milling, and the problems such as excess interface reaction are avoided.

The invention discloses a method for synthesizing 2-halogenated nicotinic acid ester and intermediates thereof through microwave method. The method comprises the following steps: adding substitute amino acrolein, a catalyst and cyan-acetic ester into a reactor, carrying out reaction under microwave radiation, and tracking the reaction till substitute amino acrolein disappears to prepare and obtain reaction liquid of the intermediates of 2-halogenated nicotinic acid ester; adding hydrogen halide into the reaction liquid, continuously carrying out reaction, and tracking and monitoring the reaction till the reaction is complete; adding alkali liquor into the reaction liquid to adjust the pH value to 5-6; carrying out standing delamination to obtain an aqueous layer and an organic layer; extracting the aqueous layer with an organic solvent, combining the extracted aqueous layer with the organic layer, and carrying out refinement to prepare and obtain 2-halogenated nicotinic acid ester. The synthesis method of 2-halogenated nicotinic acid ester related to the invention has the advantages of beingenvironment-friendly, short in reaction time, simple to operate, high in product yield and good in quality.

The invention discloses a low-quality waste heat recovery power generation device. The low-quality waste heat recovery power generation device comprises a resource recovery system, a power generation system and a water supply system; the resource recovery system comprises a heat tube steam generator, a descending steam pipeline, a steam manifold, an ascending steam pipeline, a flue gas inlet, a flue gas primary path, a flue gas bypass, a coal saver, a flue gas pipeline entering the coal saver and a residual flue gas exhaust pipeline; the power generation system comprises a steam bypass, a steam primary path, a gas storage tank, a root's power machine, a power generator and an electric energy quality monitoring instrument; the water supply system comprises a condenser, a deaerator, a drainage pipeline, a water supply tank, a condensing and supplementing pump, a condenser liquidometer, a water supply pipeline, a condensing pump, a water feeding pump and a deaerator liquidometer. A circulating work medium in the device is water and steam which circulate, a flue gas in a low-quality waste heat resource can be recycled. The device is simple in structure, low in cost and high in utilization ratio of energy sources.

The invention discloses a preparation process of aqueous silvery vacuum aluminized paper and a transfer coating used for the preparation process. The transfer coating is uniformly coated on a transfer transparent base film to form a uniform and compact transfer coating and then a continuous bright metal aluminum layer is plated to form a transfer film; the transfer film is adhered to bottom paper by using a transfer adhesive; the base film is separated from the paper sheet, so that only the transfer adhesive, the aluminum layer and the coating are remained on the surface of the paper sheet; the stripped base film can be newly coated and reutilized; the transfer coating consists of aqueous acrylic resin emulsion, matting paste, de-ionized water and absolute ethanol; and the mass ratio of the aqueous acrylic resin emulsion to the matting paste to the de-ionized water is 9-11:1.0-1.5:0.4-0.6. The process has higher temperature resistance level, and also has the characteristics of good viscous resistance, water resistance and leveling property. The aqueous transfer coating has the characteristics of no toxicity, no smell, transparency, stability, environmental friendliness and safety, the cost can be effectively saved, and the displacement of VOC (Volatile Organic Compounds) can be greatly reduced.

The invention discloses a low-VOC (volatile organic compound) semi-water-based heavy oil stain cleaning agent, and the cleaning agent comprises the following components in percentage by mass: 0.5-5% of a chelating agent, 0.5-3% of a surfactant, 0.5-10% of organic alkali, 0.1-0.5% of a corrosion inhibitor, 1-5% of an alcohol ether solvent, 5-20% of a builder and the balance of deionized water. Theinvention has the beneficial effects that the cleaning agent is of a semi-water-based type, a stable system is formed by combining an environment-friendly solvent and a water-soluble auxiliary agent,volatility and combustibility of the solvent are avoided, and the addition of organic alkali enhances the dissolving capacity of water-soluble dirt; warious metal processing oily dirt, including antirust oil, stamping oil, drawing oil, lubricating oil, animal fat and the like, attached to the surfaces of metal products such as steel and the like in the machining, manufacturing, storing and using processes can be rapidly and effectively removed.

The invention discloses a waste straw composite board which is prepared from the following raw materials in parts by weight: 20-30 parts of epoxy glue, 8-12 parts of a modifying agent, 80-100 parts of waste straws, 10-15 parts of a tackifier, 6-8 parts of gypsum, 6-12 parts of shell powder, 2-4 parts of nano zinc oxide, 1-3 parts of nano titanium dioxide, 3-7 parts of a waterproof agent, 7-9 parts of a flame retardant, 8-14 parts of attapulgite and 25-35 parts of water. The waste straw composite board has the characteristics of being high in strength, good in moisture resistance, good in dimension stability, resistant to corrosion, retardant to flame, and attractive, the problems of easy blank dispersion, board sticking and difficult de-molding are avoided, the agricultural straws are greatly used to reduce cost and save resources, continuous production is realized, production efficiency is greatly improved, a process is simple, and the waste straw composite board has a relatively high practical value and good application prospect.

Steel slag sand-straw ash co-doped mortar of the invention comprises the following raw materials (by weight): 5-30 parts of cement, 20-50 parts of river sand, 20-60 parts of steel slag sand, 1-20 parts of straw ash, 1-20 parts of fiber, and 0-5 parts of a mortar additive. By high value-added utilization of two industrial waste materials (steel slag and straw ash), the straw ash is used as an alkali-activator to activate early activity of steel slag and heat insulation function of straw fiber, high strength, low shrinkage, slight expansion, safety and stability, heat insulation and environmental protection of the steel slag sand-straw ash co-doped mortar have achieved good effects.

This invention relates to a preparation method for benzonitrile monomer liquid crystal, belonging to monomer liquid crystal preparation technology field. The method is characterized by the monomer liquid crystal synthesis routes, as shown in formula (I), wherein R is C1-C10 straight chain alkyl, n = 0 or 2, m = 0 or 1, A = cyclohexyl, and Y, Z = F or H, but at least one of Y and Z is H atom. The high-yield products could be obtained through using the formula (II) above as raw materials and high temperature cyanidation. The synthesis method is simple, has relatively mild reaction conditions, low cost of production, and is also environmental-friendly, therefore it is particularly suited to industrialized production of 4-(trans-4'-substituted cyclohexyl) benzonitrile monomer liquid crystal.

The invention belongs to the technical field of disinfection, and particularly relates to a disinfectant with a composite medium-effect disinfection function. The disinfectant with the composite medium-effect disinfection function, provided by the invention, is prepared by taking a disinfectant, a nano antibacterial material, a stabilizer and a surfactant as main raw materials in a water system. The pH value of the disinfectant is 7-8.5, and the disinfectant comprises 0.5-1.7 parts of a surfactant, 2-12 parts of a disinfectant, 3-10 parts of a stabilizer, 4-10 parts of a nano antibacterial material and 80-100 parts of deionized water. According to the formula and the preparation process adopted by the invention, the stability of the sodium hypochlorite and the nano sol in the water-based disinfectant is improved. Under the action of the surfactant and the stabilizer, the use effect of the disinfectant can be greatly improved. During use, secondary pollution is small, and the problems of inflammability and explosiveness caused by volatilization of alcohol disinfectants in air are solved. The disinfectant can be used as a spray, a lotion and the like, and has a good disinfection effect.

The present invention discloses a method for preparing insoluble sulfur, and the method comprises the following steps of: adding sulfur into a reactor, when the temperature in the reactor rises to 160 degrees centigrade, starting stirring, and adding a stabilizer after keeping the temperature for 10-15min; continuing to heat to a reaction temperature, actuating a fan after the reaction is terminated, simultaneously feeding nitrogen gas into the reactor, and rapidly cooling the reaction product which enters an ice water bath from sieve pores; placing the cooled product into an drying oven for curing and drying, then ball milling for crushing, adding the crushed product together with an extractant into an extraction tank to perform extraction, for residue after suction filtration, repeatedly performing the above-mentioned extraction and filtration until the final residue is substantially constant in weight, and vacuum drying the residue to obtain insoluble sulfur powder. The insoluble sulfur obtained by using the present method is not mixed with metal ions; the improvement of the reactor apparatus can accelerate the cooling of the product; and the organic solvent used is non-toxic and non-volatile.

The invention discloses a method for separating and purifying 7-hydroxyl tropolone from bacteria supernatant. The method comprises the following steps: (1) collecting fermentation liquor of pseudomonas donghuensis HT (the accession number is CCTCC NO: M 2015481), centrifuging and then filtering supernatant to obtain supernatant of a bacteria solution; (2) extracting the supernatant of the bacteria solution with ethyl acetate, retaining a water phase of the lower layer, regulating the pH of the water phase to be acidic, extracting the water phase with the ethyl acetate again, and collecting an organic phase of the upper layer; (3) evaporating the ethyl acetate in the organic phase to dryness under reduced pressure, and dissolving the rest of substances in anhydrous ethanol; and (4) carrying out chromatographic purification by using Sephadex LH-20, wherein a mobile phase is the anhydrous ethanol; collecting components with ferrous chelate activity, and evaporating the anhydrous ethanol to dryness under reduced pressure to obtain the 7-hydroxyl tropolone. By the method, the 7-hydroxyl tropolone of which the purity reaches 90% or above can be obtained, and the recovery rate is greater than 60%.

The invention belongs to the field of kitchen equipment and discloses kitchen waste water pump drainage and kitchen waste treatment equipment, which comprises an outer shell component, a pumping device, a smashing device, a separating device, a motor component and a residue barrel. The invention provides the kitchen equipment which can pump waste water in cookers and smash and separate residues. The equipment can clean water accumulated in a pot through a pumping function, send waste water containing solid wastes including vegetable leaves, broken bones and the like to the equipment, and smashthe solid wastes, the smashed residues enter the separating device together with the waste water, water is thrown out and discharged out of the equipment under the action of a centrifugal force generated through high speed rotation, residues enter the residue barrel to be collected and treated, further, the equipment allows running water to enter to clean automatically, and after being introducedinto the equipment, high temperature steam can sterilize the equipment at a high temperature, so as to keep the equipment clean and sanitary all the time.

Steel slag sand-straw ash co-doped mortar of the invention comprises the following raw materials (by weight): 5-30 parts of cement, 20-50 parts of river sand, 20-60 parts of steel slag sand, 1-20 parts of straw ash, 1-20 parts of fiber, and 0-5 parts of a mortar additive. By high value-added utilization of two industrial waste materials (steel slag and straw ash), the straw ash is used as an alkali-activator to activate early activity of steel slag and heat insulation function of straw fiber, high strength, low shrinkage, slight expansion, safety and stability, heat insulation and environmental protection of the steel slag sand-straw ash co-doped mortar have achieved good effects.

The invention discloses an artificial board processing method, which comprises the following manufacturing steps that 1, a flame retardant is added into cherry blossom texture decorative paper; dryingis performed to obtain flame retardant cherry blossom texture adhesive film paper; 2, the flame retardant and blank seeds for manufacturing a base plate are uniformly mixed; hot pressing is performedfor manufacturing a flame retardant base plate; 3, assembling a flame retardant cherry blossom texture stainless steel template and a buffer pad into a single layer hot pressing machine; the flame retardant cherry blossom texture adhesive film paper is conveyed to a specific position; the buffer pad is put between a hot pressing plate of the hot pressing machine and the cherry blossom texture stainless steel template; the temperature is slowly raised; then, heat insulation is performed; 4, sundries such as board scraps and dust on the flame retardant base plate are cleaned and brushed; 5, thefirst flame retardant cherry blossom texture adhesive film paper, the cleaned and brushed flame retardant base plate and the second cherry blossom texture adhesive film paper are paved from top to bottom to form an artificial board blank; 6, the artificial board blank in the step 5 is subjected to hot pressing by the hot pressing machine; 7, after trimming and cooling balance, the manufacturing of a flame retardant cherry blossom texture veneer composite board is completed.

The invention provides a barite pollution blockage remover composition of an oil-gas well of an oilfield. The composition is prepared from the following raw materials in parts by weight: 20-25 parts of acetone semicarbazon, 16-20 parts of 5-carboxylic acid-3-amino-1,2,4-triazole, 13-16 parts of L-sodium aspartate, 3-5 parts of crown ether (18-crown-6), 7-10 parts of phenyl diethyl malonate, 11-15 parts of dimethylethanolamine, 33-37 parts of ethosuximide, 9-13 parts of iminodiacetic acid, 30-35 parts of ammonia water (40 wt%) and 70-80 parts of water. The blockage remover composition is used for removing blockage of a stratum with barite pollution in drilling mud; the blockage removal speed is high, and the blockage removal of barite pollution in the oil-gas well can be completed within 4-12 h, and therefore, the yield of the oil-gas well of the oilfield is recovered and improved; the descaling rate is 98% or higher, and the blockage removal of barite pollution in the oil-gas well of the oilfield is completed by a one-step method; the safe and non-corrosive blockage removal is achieved; no corrosion, no dead angle, no precipitation or no secondary well clogging are caused; 90% or more of barite mud pollution can be effectively removed.

The invention relates to a preparation method of 3-aminomethyl tetrahydrofuran, and the preparation method comprises the following steps: cyclizing compound 1 cis-butenediol to obtain a compound 2, namely 2,5-dihydrofuran, then formylating the 2,5-dihydrofuran to obtain a compound 3, namely 3-formyl tetrahydrofuran, and finally performing reductive amination to obtain a compound 4, namely the 3-aminomethyl tetrahydrofuran. The preparation method has the advantages of simple production process, high utilization rate of materials, large production capacity, high selectivity, durability and highefficiency of catalysts in each step. The preparation method is simple in route and easy to scale up in industrialization.

The invention discloses a rich oil debenzolization heating system which comprises a heat exchanger, a heated fluid inlet of the heat exchanger is connected with a rich oil inlet pipeline, a heated fluid outlet of the heat exchanger is connected with a rich oil outlet pipeline, the other end of the rich oil outlet pipeline is connected to a debenzolization tower, and a temperature sensor is arranged on the rich oil outlet pipeline. A heat transfer fluid inlet of the heat exchanger is connected with a superheated steam pipeline, the other end of the superheated steam pipeline is connected with asteam boiler, a heat transfer fluid outlet of the heat exchanger is connected with a condensed water pipeline, and the other end of the condensed water pipeline is connected to a low-pressure flash tank. The heating system is small in occupied area, safe and environmentally friendly, sulfur, nitric oxide and other return gas are not generated, the risk of coal gas combustion is avoided, cost is saved, and economic benefits are improved.

The invention discloses a method for synthesizing 2-halo-3-substited alkylsulfonyl pyridine and an intermediate compound thereof through a microwave method. The method comprises the following steps: adding substituted amino acraldehyde, a catalyst and substituent cyanoethyl sulfone into a reactor, reacting under microwave radiation, and tracking the reaction until the substituted amino acraldehyde or the substituent cyanoethyl sulfone reacts completely, thereby preparing the intermediate compound; adding halogen hydride into the reaction solution, further reacting, and tracking detection until the reaction is complete; and adding an alkaline solution into the reaction solution to regulate the pH value to 7-8, standing for stratification to obtain a water layer and an organic layer, extracting the water layer with organic solvent, then merging the organic layers, and refining to prepare the 2-halo-3-substited alkylsulfonyl pyridine. According to the invention, the method for synthesizing 2-halo-3-substited alkylsulfonyl pyridine has the advantages of greenness, environment friendliness, short reaction time, simple operation process and high product yield; and the product has favorable bactericidal activity.

The invention provides a preparation method of a fireproof organic negative ion coating, which comprises the following steps: preparing negative ion particles: mixing tourmaline powder and water underthe condition of magnetic stirring to obtain tourmaline suspension; adding rare earth salts into the tourmaline suspension and mixing to obtain a mixed solution; adding a precipitant into the mixed solution to precipitate, drying the precipitate to obtain negative ion particles; preparation of fireproof particles: graphite is mixed with a mixture solution of hydrogen peroxide and nitric acid by stirring to obtain oxidized graphite; mixing the oxidized graphite with water, and then adding glacial acetic acid into the oxidized graphite dropwise and stirring to obtain fireproof particles; preparation of fireproof organic anion coating: mixing and grinding PVC and fire-retardant particles to obtain abrasive; preparing the fireproof organic negative ion coating by adding negative ion particlesand processing aid into the abrasive and stirring. The fireproof organic negative ion coating has the advantages of high performance-price ratio, effective removal of organic hazards and good fireproofing performance.

A kind of preparation method of AlN particle reinforced Mg-Al matrix composite material, after weighing magnesium powder, aluminum powder, AlN powder and stearic acid, put into the nylon ball mill tank that has argon protection, put on the roller mill and pass through low-speed Long-term ball milling and mixing to make a uniformly mixed powder, and then press in a steel mold to form a prefabricated block green body by two-way pressure, and finally put the green body into a graphite crucible and put it into a vacuum sintering furnace. Carry out pre-evacuation, then pass through argon, and heat and sinter under the protection of argon. The AlN particle-reinforced Mg-Al-based composite material prepared by the invention is evenly distributed, has high density, good interface bonding, good mechanical and physical properties, and at the same time avoids the danger of high-activity magnesium powder being easily combusted during high-energy ball milling , and problems such as excessive interface reactions.

The invention provides a mine ventilation system based on coal mining. The mine ventilation system comprises a plurality of monitoring modules, an air inlet fan, an air inlet shaft, a plurality of shutter air inlet modules, a plurality of atomization spraying modules, an air return shaft, an air return fan and a remote controller. The plurality of monitoring modules are installed on the top of the well wall of a mine, and each monitoring module is in bidirectional communication connection with the remote regulator. Various concentrations of air in a mine are monitored through the monitoring module, the air inlet amount of the shutter air inlet module is adjusted through the remote controller according to data monitored by the monitoring module, the ventilation amount in the mine can be adjusted, the atomization spraying module is controlled through the remote controller to conduct atomization spraying, and the spraying efficiency is improved. The spray can flow into the mine along with air, and is combined with various hazardous gases in the mine to settle, so that the hazardous gases can be diluted and settled in the circulation process, and the inflammable and explosive conditions of the gases in the circulation process are avoided.

The invention relates to a rectifying and spray-freezing drying method for preparing polyethylene oligomer powder. The method comprises the following steps: (1) performing indirect heat exchange between a polyethylene wax solution and saturated steam, thereby separating a solvent, methylbenzene, from polyethylene wax; (2) performing indirect heat exchange between the solvent, methylbenzene, and a cooling medium for cooling the solvent, methylbenzene, till the solvent, methylbenzene, is in a liquid state, and circulating part of methylbenzene in a liquid state in a rectifying tower while discharging the rest; and (3) dividing the polyethylene wax solution into two parts, heating one part with saturated steam and returning the heated part into the rectifying tower to obtain steam condensate and discharging the steam condensate, and conveying the other part into a spray-freezing tower to form vaporific polyethylene wax drops, performing heat exchange between the drops and cold nitrogen to obtain powder and nitrogen containing superfine powder, purifying the nitrogen containing superfine powder to obtain superfine powder and purified nitrogen, and performing supercharging and cooling on most of the purified nitrogen and then returning the nitrogen into the spray-freezing tower while feeding the rest into an exhaust treatment system. The rectifying and spray-freezing drying method has a simple operation process and is high in heat efficiency.

The invention provides a preparation method of an isoprothiolane suspending agent by employing water as a solvent. The method comprises the following steps: heating deionized water to 30-80 DEG C, adding the deionized water to a high-shear kettle, stirring, and adding a dispersing agent until the dispersing agent is completely dissolved; feeding the following raw materials in percentage by weight: 10%-60% of isoprothiolane, 0.1%-10% of a wetting agent, 0.1%-10% of a thickening agent, 0.1%-8% of an antifreezing agent, 0.1%-5% of a defoaming agent, 0.1%-10% of a dispersing agent and the balance being the deionized water to the high-shear kettle, pulping, carrying out high-speed shearing, and cooling; pumping pulp into a sand mill through a pipeline and a diaphragm pump, and grinding at a high speed; and adjusting the particle sizes of suspending agent particles to be 0.1-4 microns, and adjusting the pH to be 6.5, so as to obtain a qualified isoprothiolane suspending agent product. Compared with missible oil, the isoprothiolane suspending agent has the beneficial effects that use of a lot of organic solvents and the problems of combustion and pesticide hazards generated by the organic solvents are avoided; the effects on environment, caused by the organic solvents, are completely eradicated; and compared with wettable powder, the isoprothiolane suspending agent is free of dust flying and drifting, safe to an operator and the environment, low in cost, and safe to produce, store, transport and use.

The invention discloses a preparation method and application of a hydrophobic layered bimetallic oxide catalyst. The preparation method comprises the following steps of: firstly, preparing a Pt / NiAl-LDHs catalyst precursor of which Pt ions are reduced into elementary substance Pt by an in-situ precipitation reduction process; then calcining the catalyst precursor to obtain a catalyst Pt / NiAl-LDO of which the simple substance Pt grows on layered bimetallic metal oxide laminates and among the laminates in situ. According to the invention, the prepared catalyst Pt / NiAl-LDO is further prepared into a catalyst sheet for application. Firstly, the lattice positioning effect on LDHs laminates and the induction effect of the laminate growth process on the growth of active metal precursor microcrystals are utilized to implement high dispersion of active elemental Pt particles, thereby enhancing the catalytic efficiency, reducing the consumption of Pt noble metal and lowering the cost. And secondly, the carrier NiAl-LDO obtained by roasting NiAl-LDHs has better hydrophobic performance, so that the poisoning phenomenon of the traditional Pt / C catalyst in a high-humidity environment can be effectively prevented, the regeneration frequency of the catalyst is reduced, the operation efficiency of the system is improved, and the operation cost is reduced.