32results about How to "Coagulation does not occur" patented technology

The present invention relates to a line connector (1) for media lines, comprising a connecting piece (2) having at least one connection section (6, 8) for the connection to a media line (4) or to an assembly, and having a transitional section (10) comprising a flow channel (11), the section adjoining the connection section (6, 8). To this end, electrical heating means (12) are provided at least in the region of the transitional section (10) in an arrangement that at least partially surrounds the flow channel (11). The invention further relates to an assembled media line comprising a pipe line having a heating conductor (29) arranged on the circumference thereof, and a heatable line connector attached to at least one pipe line end of the media line.

The invention relates to cryopreservation protection liquid for Wharton jelly tissues of a human umbilical cord. The cryopreservation protection liquid comprises 5-10 percent of a permeable cryoprotectant, 1-5 percent of a non-permeable cryoprotectant, 10-20 percent of a knockout serum replacement and 70-80 percent of a serum-free basal culture medium. The invention also discloses a preparation method of the cryopreservation protection liquid. The preparation method specifically comprises the steps of (1) precooling the serum-free basal culture medium, the non-permeable cryoprotectant and the knockout serum replacement, mixing and uniformly shaking; (2) adding the permeable cryoprotectant; and (3) performing refrigeration under a temperature condition of 2-6 DEG C for more than 30min. The invention also discloses a cryopreservation method for the Wharton jelly tissues of the human umbilical cord by the cryopreservation protection liquid. The cryopreservation method comprises the following steps of (1) pretreating the umbilical cord; (2) peeling off the Wharton jelly tissues; and (3) cryopreserving the Wharton jelly tissues of the human umbilical cord. The cryopreservation protection liquid and the cryopreservation method which are used for treating the Wharton jelly tissues of the human umbilical cord have the advantages that injury to umbilical cord mesenchymal stem cells in a cryopreservation process can be alleviated, so that the activity and the clinical use safety of the umbilical cord mesenchymal stem cells are guaranteed.

The invention provides an anti-freezing glass cleaning agent. The anti-freezing glass cleaning agent comprises the following main components in parts by weight: 5-20 parts of a solvent, 1-10 parts ofa surface active agent, 0.01-0.1 part of an anti-freezing agent, 0.1-1 part of a disinfecting agent, 0.01-0.05 part of a PH regulating agent, 0.01-0.1 part of a chelating agent and 0.05-0.1 part of apreservative. The anti-freezing glass cleaning agent provided by the invention has the advantages of strong cleaning capability, disinfection, sterilization and low-temperature anti-freezing property.

The invention relates to a preparation method of naphthol AS. The method comprises a condensation process, an alkali cooking process, a filtration process, a drying process and a tail gas recycling process, wherein the condensation process comprises the following steps: 1) adding chlorobenzene and an organic solvent into a suspension pot; 2) after stirring and mixing, adding 2-hydroxy-3-naphthoic acid and an oil soluble ionic dispersant, stirring and adding aniline into the suspension pot; 3) filling materials in the suspension pot into a condensation reaction kettle and dropwise adding mixed liquid of phosphorus trichloride; 4) after the completion of dropwise adding of the mixed liquid of the phosphorus trichloride, heating with steam to obtain condensation materials. The preparation method of the naphthol AS provided by the invention has the benefits that a produced naphthol AS product has good quality and high yield; as the oil soluble ionic dispersant and the organic solvent are added in the condensation process, the dispersion of particles in suspension liquid is more uniform, and the coagulation phenomena cannot occur, so that the condensation process reaction is complete, the time of the condensation process is shortened, and the economic benefit is improved.

The invention relates to a liquid-phase CO2 methanation catalyst, a preparation method and application of the catalyst. The liquid-phase CO2 methanation catalyst comprises amphipathic ionic liquid and metal active components dispersed in the amphipathic ionic liquid in the state of stable colloid, the grain sizes of the metal active components range from 0.5nm to 20nm, the spherical metal active components include a first metal active component and a second metal active component, the first metal active component includes nickel, the second metal active component includes one or mixture of more than one of lanthanum, cerium, molybdenum, ruthenium, ytterbium, rhodium, palladium, platinum, potassium and magnesium, and the molar ratio of the first metal active component to the second metal active component is 10:0.1-2. The metal active components in the liquid-phase CO2 methanation catalyst are small in grain size, narrow in distribution, wide in application prospect, easy to separate and recyclable, CO2 methanation of low-temperature liquid phase can be realized at the temperature of 100-200 DEG C, the liquid-phase CO2 methanation catalyst has excellent low-temperature catalytic activity, methane selectivity and heat stability, and the preparation method is simple and practicable, low in cost and easy in popularization.

The invention relates to the technical field of cosmetics, in particular to an antibacterial and moisture preservation mask with the mild touch sense and a manufacturing method thereof. Glycerol contents are not added in a product; after the face is coated with the mask, the touch sense is mild but not sticky or greasy; under the effects of emulsifying and thickening ingredients such as acrylic ester / vinyl isodecanoate crosslinked polymers, dimethicone, carbomer and butanediol, after the still standing for 4 to 8 h after the coating of the product, the surface layer is in a half solidified state; the influence of the product on bedding, mattress and pillows under unconscious actions during deep sleeping can be reduced. In addition, through the use of nanometer silver with strong antibacterial and bactericidal effects, the complementary effect is achieved with allantoin, and D-panthenol antibacterial and bactericidal ingredients in the formula, so that the antibacterial and bactericidalcapability of the product is improved. The synergistic effect is achieved with moisture preservation ingredients of trimethylglycine trimethylglycocoll, phycite, sodium hyaluronate and the like in the product; the skin fine blood vessels, inflammation or acne are fast restored; meanwhile, watery and glossy states are restored.

The invention discloses small-size gadolinium-polyphenol polymer nano-particles and a preparation method and application thereof. In a mixed solvent containing polyvinylpyrrolidone, under the alkalescent condition, polyphenol is covalently cross-linked into polyphenol oligomer with an aldehyde cross-linking agent, then metal gadolinium salt is added, and the metal gadolinium salt and the polyphenol oligomer are cross-linked through metal-organic ligand to form the small-size gadolinium-polyphenol polymer nano-particles. In the reaction process, the size of the gadolinium-polyphenol polymer nano-particles is controlled by adjusting the use level of the polyvinylpyrrolidone. The method is easy to operate, low in synthesis process and high in process controllability, and the size and composition of the small-size (10-100 nm) metal-polyphenol polymer nano-particles can be precisely regulated and controlled. Due to the fact that functional and targeted modification of the polymer nano material are easy, the small-size gadolinium-polyphenol polymer nano-particles have wide application prospects in the fields of medical imaging, drug delivery, photo-thermal treatment, biosensing and the like.

The invention belongs to the technical field of engineering construction and specifically discloses a grouting pipe bit for road construction. The grouting pipe bit comprises a drill bit main body, wherein a first chamber is formed in the drill bit main body; a high-pressure runner which is connected with the first chamber is formed on the drill bit main body; a high-pressure nozzle is arranged inthe high-pressure runner; a drill tip is arranged on the lower part of the drill bit main body; a second chamber is formed in the drill bit; the first chamber is connected with the second chamber; anauxiliary grouting hole which is connected with the second chamber is formed on the drill tip; a hydraulic control cut-off unit and a grout backflow unit are arranged in the second chamber. The grouting pipe bit with such a structure is capable of solving the problem of pipeline blocking caused by the stagnation and solidification of residual grout in the channel during high / low pressure conversion process.

The invention discloses a preparation method of a CT imaging molecular probe of folate receptor targeted tumors, which comprises the following steps: dissolving folic acid which is used as a wrapping agent in a solution which contains gold ions and is used for preparing nanogold, adjusting the pH to 7.0-7.5 to obtain a mixed solution, wherein the molar ratio of folic acid to gold ions is 1:2-6; adding a reducing agent into the mixed solution, rapidly stirring and reacting for at least 1 hour, naturally cooling after the reaction, performing dialysis to remove unreacted parts so as to obtain the nanogold coated by folic acid. The nanogold coated by folic acid FA-GNP prepared in the invention has high attenuation capability for X ray, and can be used as a CT imaging contrast agent; the FA-GNP can provide CT images with high contrast for tumors.

The invention discloses a spicy hot pot seasoning and a preparation method thereof, wherein the spicy hot pot seasoning is prepared from the following raw materials in parts by weight: 45-55 parts ofsalad oil, 25-35 parts of beef tallow, 3-7 parts of onion, 3-7 parts of garlic, 2-4 parts of ginger, 7-13 parts of chili pepper, 50-80 parts of oyster oil, 5-10 parts of rock candy, 5-10 parts of zanthoxylum bungeanum, 0.1-0.3 part of radix angelicae, 0.8-1.2 parts of star anise, 0.3-0.7 part of fennel, 0.05-0.2 part of clove, 0.4-0.6 part of bay leaf, 0.1-0.3 part of amomum tsao-ko, 0.1-0.3 partof lemongrass, 1-3 parts of cassia bark, 0.1-0.5 part of nutmeg, 1-3 parts of amomum cardamomnm, 0.5-2 parts of pericarpium citri reticulatae, 0.1-0.3 part of alpinia hainanensis, and 0.5-2 parts of piper longum l. The spicy hot pot seasoning not only has bright red color and luster, but also tastes delicious, mellow and soft, has high nutritional value, and does not easily cause the symptom of gastrointestinal discomfort after being eaten.

The invention discloses a biological viscosity-reducing agent for seatangle composed constituents with weight percent as: 50-60% biochemical seatangle viscosity liquid, 2-15% vitamin H, 3-15% kerogen, 10-25% emulsifier OP-10, with activity performance index: water wetting contact angle less than 70Deg, medium wetting 75-125Deg, and oil wetting contact angle more than 125Deg. The opposite preparation comprises: selecting dried seatangle of 50-60% full weight; cleaning, smashing; bathing with sodium hydroxide to separate seatangle viscosity; taking biochemical emulsification treatment with proper other said material. This product has well viscosity reduction effect to solve existing problem in oil refining with high economic and social benefits.

The invention discloses small-size gadolinium-polyphenol polymer nano-particles and a preparation method and application thereof. In a mixed solvent containing polyvinylpyrrolidone, under the alkalescent condition, polyphenol is covalently cross-linked into polyphenol oligomer with an aldehyde cross-linking agent, then metal gadolinium salt is added, and the metal gadolinium salt and the polyphenol oligomer are cross-linked through metal-organic ligand to form the small-size gadolinium-polyphenol polymer nano-particles. In the reaction process, the size of the gadolinium-polyphenol polymer nano-particles is controlled by adjusting the use level of the polyvinylpyrrolidone. The method is easy to operate, low in synthesis process and high in process controllability, and the size and composition of the small-size (10-100 nm) metal-polyphenol polymer nano-particles can be precisely regulated and controlled. Due to the fact that functional and targeted modification of the polymer nano material are easy, the small-size gadolinium-polyphenol polymer nano-particles have wide application prospects in the fields of medical imaging, drug delivery, photo-thermal treatment, biosensing and the like.

The invention relates to an anesthesia breathing mask. The anesthesia breathing mask comprises a rigid mask body, a soft annular sealing part used for covering the mouth and the nose of a user is arranged on the mouth edge of the open end of the rigid mask body, an air supply connecting pipe is at least arranged on the mask body, a catheter seat is arranged on the mask body, a central hole of thecatheter seat serves as a rigid pore passage enabling the inner face and the outer face of the mask body to communicate, a soft diaphragm of an annular-strip-shaped structure is arranged in the rigidpore passage, the periphery of the soft diaphragm is fixed to the inner wall of the rigid pore passage in a closed mode, an annular filling cavity is defined by a rigid inner wall area, between the upper edge and the lower edge of the diaphragm, in the rigid pore passage and the diaphragm, the outer surface of the diaphragm arches towards the center of the central hole and forms a sealing fit holeallowing a catheter to penetrate, a connecting hole allowing liquid or gas in the cavity to communicate with the outside is formed in the side wall of the filling cavity, and a ventilation connectingpipe communicating with the outside is connected to the connecting hole.

The invention relates to a metal surface alloying method in which a non-uniform heat source promotes convection of a molten pool, comprising the following steps: 1) using a first heat source to heat and melt the metal surface to form a molten pool; 2) alloying gas entering the molten pool for reaction Compounds with high melting points are generated, and the compounds tend to solidify to form a solidified layer. The second heat source is used to heat the area where the compound is located to ensure that the compound does not solidify, promote the convection of the molten pool, and form an alloyed layer with uniform composition and structure. The first heat source and The second heat source is arranged in sequence along the moving direction of the heat source, and the power density of the second heat source is greater than that of the first heat source; 3) Along the moving direction of the heat source, the first heat source and the second heat source move as a whole, and the molten pool solidifies to form an alloy layers. The above-mentioned non-uniform heat source is used for laser gas alloying of the metal surface, and finally an alloyed layer with better structure and performance is obtained.

The invention discloses Bavistin microemulsion which comprises the following components by weight percent: 0.8-1.6% of Bavistin, 5.8-11% of solvent chloroform, 4-7.4% of solvent acetic acid, 16.7-22.2% of emulsifier HSH (hydrogenated starch hydrolyzate), 8.3-11.1% of emulsifier Nongru 0204, 12.5-16.7% of co-emulsifier methanol and the balance deionized water. The invention also discloses a preparation method of the Bavistin microemulsion. The Bavistin microemulsion has the advantages of high efficiency, low toxicity, low cost, good environment compatibility and the like, and can be widely used for preventing and treating the plant diseases of various crops, fruits, vegetables and the like.

The invention discloses a calf artery blood sampling method. The calf artery blood sampling method includes the following steps that 1), a blood collecting barrel is washed with pure water 2-3 times,then the blood collecting barrel is soaked with 75% medical alcohol for 30-50 min, and the blood collecting barrel is put in a clean region for use after being dried; 2), a medical silicone tube and ablood receiving tool which are soaked with 2% sodium hydroxide are flushed with pure water 2-5 times, and then a blood drawing tool and a blood sampling tube with the two ends seal-bound by tin foilpaper are put in a high-pressure sterilization pot to be sterilized for use; 3), a calf is put on an operating table, conventional skin preparation is carried out on the neck artery of the calf, and then the skin is disinfected with a 5% bromogeramine solution; 4), after the skin is disinfected, the neck of the calf is cut up, an artery blood vessel is found, a small opening is cut up, the medicalsilicone tube is inserted into the small opening, the other end of the medical silicone tube is put in an inlet of the blood collecting barrel, and blood sampling is carried out. By means of the blood sampling method, rapid blood sampling can be achieved, the blood sampling amount is large, blood samples are not easily contaminated, and the method is suitable or large-scale use and popularization.

The invention discloses a leakage plugging method for an oil pipe, which belongs to the safety field of oil and gas wells. The method includes: determining the position of the leak point on the oil pipe; setting the oil pipe with a plug, the plug being located below the leak point in the length direction of the oil pipe; squeezing a plugging agent from the oil pipe into the leak point, and make the plugging agent solidify in the leak point during the extrusion process; take out the plug. In the invention, the oil pipe is first set with a plug, and the leakage plugging agent is squeezed into the leakage point channel from the oil pipe to block the leakage point. The whole process does not need to take out the oil pipe and does not change the structure of the pipe string. The entire plugging construction operation is simple, and the construction time is only It takes a few days, the cost is low, and the risk is low.

The invention belongs to the technical field of engineering construction and specifically discloses a grouting pipe bit for road construction. The grouting pipe bit comprises a drill bit main body, wherein a first chamber is formed in the drill bit main body; a high-pressure runner which is connected with the first chamber is formed on the drill bit main body; a high-pressure nozzle is arranged inthe high-pressure runner; a drill tip is arranged on the lower part of the drill bit main body; a second chamber is formed in the drill bit; the first chamber is connected with the second chamber; anauxiliary grouting hole which is connected with the second chamber is formed on the drill tip; a hydraulic control cut-off unit and a grout backflow unit are arranged in the second chamber. The grouting pipe bit with such a structure is capable of solving the problem of pipeline blocking caused by the stagnation and solidification of residual grout in the channel during high / low pressure conversion process.

The invention relates to cryopreservation protection liquid for Wharton jelly tissues of a human umbilical cord. The cryopreservation protection liquid comprises 5-10 percent of a permeable cryoprotectant, 1-5 percent of a non-permeable cryoprotectant, 10-20 percent of a knockout serum replacement and 70-80 percent of a serum-free basal culture medium. The invention also discloses a preparation method of the cryopreservation protection liquid. The preparation method specifically comprises the steps of (1) precooling the serum-free basal culture medium, the non-permeable cryoprotectant and the knockout serum replacement, mixing and uniformly shaking; (2) adding the permeable cryoprotectant; and (3) performing refrigeration under a temperature condition of 2-6 DEG C for more than 30min. The invention also discloses a cryopreservation method for the Wharton jelly tissues of the human umbilical cord by the cryopreservation protection liquid. The cryopreservation method comprises the following steps of (1) pretreating the umbilical cord; (2) peeling off the Wharton jelly tissues; and (3) cryopreserving the Wharton jelly tissues of the human umbilical cord. The cryopreservation protection liquid and the cryopreservation method which are used for treating the Wharton jelly tissues of the human umbilical cord have the advantages that injury to umbilical cord mesenchymal stem cells in a cryopreservation process can be alleviated, so that the activity and the clinical use safety of the umbilical cord mesenchymal stem cells are guaranteed.

The water lettuce plant viscosity reducer and production method of the present invention belong to the petroleum field. The water lettuce plant viscosity reducer contains the following components, and the weight percentages of each component are as follows: biochemical water lettuce plant fermentation liquid 20-65%, surface Active agent 5-25%, liquid silicone 2-15%, mixed for emulsification treatment, the present invention has a good visbreaking effect on petroleum crude oil and stable performance, and the visbroken crude oil basically does not occur during transportation and storage. The solidification phenomenon solves the problem of secondary visbreaking and multiple dehydration before oil refining, and reduces the cost of oil refining. At the same time, because the present invention adopts the mechanism of biological visbreaking, it avoids the large use of organic matter and overcomes the problems caused by the use of organic matter. It has high economic and social benefits.

The preparation process comprises the following steps: firstly, grinding a flame retardant and an antibacterial agent, and mixing with NMMO (N-methylmorpholine-N-oxide) to prepare a functional additive; dissolving cotton linter fibers in a copper ammonia solution, stirring and dissolving, then adding the prepared functional additive, fully stirring, and obtaining a copper ammonia fiber spinning solution after the functional additive is completely dispersed; adding a sodium hydroxide solution into the spinning stock solution, stirring, standing, solidifying, neutralizing with dilute sulphuric acid, and then adding a coagulant ethanol for solidifying to obtain copper ammonia fibers; the copper ammonia fiber prepared by adopting the preparation method disclosed by the invention has good flame retardant property and antibacterial property, and the functional additive has good adhesiveness, good serviceability and durability and good acid and alkali resistance.

The present invention relates to a line connector (1) for media lines, comprising a connecting piece (2) having at least one connection section (6, 8) for the connection to a media line (4) or to an assembly, and having a transitional section (10) comprising a flow channel (11), the section adjoining the connection section (6, 8). To this end, electrical heating means (12) are provided at least in the region of the transitional section (10) in an arrangement that at least partially surrounds the flow channel (11). The invention further relates to an assembled media line comprising a pipe line having a heating conductor (29) arranged on the circumference thereof, and a heatable line connector attached to at least one pipe line end of the media line.

The invention relates to an antistatic agent for a spandex oiling agent and a preparation method of the antistatic agent. The antistatic agent for the spandex oiling agent is prepared by the followingsteps: reacting a hydrogen-containing siloxane polymer with an epoxy compound with double bonds to prepare an epoxy siloxane polymer, then distilling to remove unreacted residual raw materials, so asto obtain the epoxy siloxane polymer for the next reaction, reacting organic carboxylic acid with organic tertiary amine to obtain an organic acid quaternary ammonium salt, and finally, reacting theepoxy siloxane polymer with the organic acid quaternary ammonium salt to obtain the antistatic agent for the spandex oiling agent. The antistatic agent for the spandex oiling agent not only has good antistatic performance, but also can be stably dispersed in basic components of the spandex oiling agent, does not coagulate after being placed for a long time, and can be widely applied to the technical field of spandex oiling agent auxiliaries.

The invention discloses a preparation method of a CT imaging molecular probe of folate receptor targeted tumors, which comprises the following steps: dissolving folic acid which is used as a wrapping agent in a solution which contains gold ions and is used for preparing nanogold, adjusting the pH to 7.0-7.5 to obtain a mixed solution, wherein the molar ratio of folic acid to gold ions is 1:2-6; adding a reducing agent into the mixed solution, rapidly stirring and reacting for at least 1 hour, naturally cooling after the reaction, performing dialysis to remove unreacted parts so as to obtain the nanogold coated by folic acid. The nanogold coated by folic acid FA-GNP prepared in the invention has high attenuation capability for X ray, and can be used as a CT imaging contrast agent; the FA-GNP can provide CT images with high contrast for tumors.

The invention relates to a medical polyurethane elastic fiber with biocompatibility and a preparation method thereof. The preparation method comprises the following steps: 1) adding polyglycol A, aliphatic diisocyanate B, chain extender glycol C, a catalyst, an auxiliary additive and the like directly into a twin-screw reactor after metering for melting, mixing and slicing to prepare a polymer P1;2) mixing and reacting modified aliphatic diisocyanate B' with polyglycol A to generate a prepolymer P2; 3) after the polymer P1 is fused and extruded and fully mixed with the prepolymer P2 in a certain proportion in a static mixer, distributing the mixture to a spinneret plate through a melt metering pump; and 4) spinning the polyurethane elastic fiber through a spinning box, a side blowing cooling device, a spinning tunnel, false twisting, oiling and a silk guide roller. The polyurethane elastic fiber prepared by the method provided by the invention has excellent biocompatibility.

The invention discloses a method for preparing antibacterial nanometer silver colloid, belonging to the technical field of nanometer biological materials. The method uses a chemical reduction method, comprising the following steps: dissolving water-soluble protective agent in silver nitrate water solution with the concentration of 0.001-0.1mol / L, wherein the mass ratio of protective agent to silver nitrate is 0.5-10.0:1; carrying out ice bath on sodium borohydride water solution with the concentration of 0.001-0.2mol / L for 10-30min; and dropwise adding the silver nitrate water solution containing protective agent in the sodium borohydride water solution with the speed of 30-60 drop / min, stirring by a magnetic stirrer, stirring for 20-40min after dropwise adding to prepare the nanometer silver colloid with the grain size of 5-80nm, wherein the mol ratio of the sodium borohydride to the silver nitrate is 1.0-30.0:1. The nanometer silver colloid prepared by the invention has the advantages of high concentration, high stability, high dispensability, and obviously-enhanced antibacterial property.

The invention relates to a metal surface alloying method for promoting molten pool convection by adopting non-uniform heat sources. The method comprises the following steps that 1) a metal surface isheated by adopting a first heat source and molten to form a molten pool; 2) alloying gas enters the molten pool to carry out reaction to generate a high-melting-point compound, the compound has the tendency of solidifying to form a solidified layer, an area where the compound is located is heated by adopting a second heat source, it is guaranteed that the compound is not solidified, convection ofthe molten pool is promoted, an alloyed layer uniform in component and structure is formed, the first heat source and the second heat source are sequentially arranged in a heat source moving direction, and the power density of the second heat source is larger than that of the first heat source; and 3) the first heat source and the second heat source integrally move along the heat source moving direction, and the molten pool is solidified to form an alloyed layer. According to the method, laser gas alloying is carried out on the metal surface by adopting the non-uniform heat sources, and finally the alloyed layer with good structure and performance is obtained.

The invention discloses an anti-solidification large-temperature-difference LNG cold energy recovery heat exchanger. The recovery heat exchanger comprises a heat exchanger cavity, an intermediate medium is injected into the cavity, the upper portion of the cavity is an intermediate medium gas phase area, the lower portion of the cavity is an intermediate medium liquid phase area, an LNG coil pipe and an NG coil pipe are arranged in the gas phase area, and a heating medium coil pipe is arranged in the liquid phase area; a baffle is arranged on the upper portion of the heat exchanger and divides the upper portion of the heat exchanger into an LNG heating area and an NG heating area, the tops of the LNG heating area and the NG heating area are communicated, an LNG coil pipe is arranged in the LNG heating area, an NG coil pipe is arranged in the NG heating area, and the top of the LNG coil pipe is in communication with the bottom of the NG coil pipe; and a heat insulation baffle is arranged on the lower portion of the heat exchanger cavity and connected to a baffle, the lower portion of the heat exchanger is divided into a mixed preheating area and an evaporation area through the heat insulation baffle, the two areas are communicated at the bottom, a low-temperature heating medium coil is arranged in the mixed preheating area, and a high-temperature heating medium coil is arranged in the evaporation area. According to the recovery heat exchanger, solidification-free efficient recycling of LNG cold energy under the large temperature difference can be achieved, and a secondary refrigerant needed by ice making or air conditioning and the like can be directly prepared.

The invention relates to a preparation method of naphthol AS. The method comprises a condensation process, an alkali cooking process, a filtration process, a drying process and a tail gas recycling process, wherein the condensation process comprises the following steps: 1) adding chlorobenzene and an organic solvent into a suspension pot; 2) after stirring and mixing, adding 2-hydroxy-3-naphthoic acid and an oil soluble ionic dispersant, stirring and adding aniline into the suspension pot; 3) filling materials in the suspension pot into a condensation reaction kettle and dropwise adding mixed liquid of phosphorus trichloride; 4) after the completion of dropwise adding of the mixed liquid of the phosphorus trichloride, heating with steam to obtain condensation materials. The preparation method of the naphthol AS provided by the invention has the benefits that a produced naphthol AS product has good quality and high yield; as the oil soluble ionic dispersant and the organic solvent are added in the condensation process, the dispersion of particles in suspension liquid is more uniform, and the coagulation phenomena cannot occur, so that the condensation process reaction is complete, the time of the condensation process is shortened, and the economic benefit is improved.