50results about How to "Play a role in decolorization" patented technology

The invention relates to a method of recycling anhydrous sulfate sodium from de-sulfurized lead paste filtration, belonging to a resource recovery and utilization process, which avoids the disadvantages that waste sulfate is used and low concentration sulfate sodium is emitted into the environment. The method of the invention comprises: desulfurized lead paste filtration collection, sodium carbonate neutralization, first time heavy metal removal, filtration PH value adjustment, second-time heavy metal removal, decolorizing step, and vaporization and crystallization step; the device comprises a transfer tank, a neutralization tank, a first-stage purifying tank, a PH adjusting tank, a second-stage purifying tank, a decolorization tank, a filtration collection tank and a vaporization crystallization system; the waste sulfate collection tank is connected with a waste sulfate pre-processing tank, the waste sulfate pre-processing tank is respectively connected with the neutralization tank and the PH adjusting tank. The invention can directly recycle anhydrous sulfate sodium, the waste sulfate is used to neutralize the carbonate sodium remained in the filtration; the heavy metal ions and other ions in the filtration are removed according to two steps, so that the grade of obtained anhydrous sulfate sodium is equal to or larger than industrial grade.

The invention provides a preparation method of walnut polypeptide. The preparation method comprises the following steps of: a, treatment of raw materials: uniformly mixing smashed material of walnut cake which is cold-pressed, degreased at a low temperature with water to obtain a walnut cake suspension; b, homogenization of the suspension: homogenizing the suspension to obtain a walnut cake mixed liquid; c, heat-insulating enzymolysis: adding a mixed enzyme liquid of AlcaLase enzyme and papain to the walnut cake mixed liquid, carrying out enzymolysis to prepare the walnut cake enzymatic hydrolysate under the enzymolysis conditions that the temperature is 50-60 DEG C, the pH value is 7.0-8.5 and the time is 6-8 hours; d, high-temperature sterilization: quickly heating the walnut cake enzymatic hydrolysate to 90-59 DEG C; e, liquid-solid separation: carrying out liquid-solid separation on walnut cake enzymatic hydrolysate after enzyme deactivation at a high temperature, removing insoluble solids to prepare a walnut polypeptide liquid; f, concentration: concentrating the walnut polypeptide liquid to obtain walnut polypeptide concentrated liquor; and g, drying: drying the walnut polypeptide concentrated liquor to obtain the walnut polypeptide.

The invention provides a preparation method of sesame polypeptide, comprising the following steps: a, treatment of raw materials: uniformly mixing water and a sesame cake crushed material, which is obtained after a low-temperature cold-pressed sesame cake is crushed, so as to obtain a sesame cake suspension; b, homogenization of the suspension: homogenizing the sesame cake suspension to prepare a sesame cake mixed liquor; c, thermal-insulation enzymatic hydrolysis: adding a mixed the sesame cake mixed enzyme liquid of AlcaLase enzyme and papain into the sesame cake mixed liquor to carry out enzymatic hydrolysis at the temperature of 50-60 DEG C at pH of 7.0-8.5 for 6-8h so as to prepare a sesame cake enzymatic hydrolysate; d, high temperature sterilization: rapidly heating the sesame cake enzymatic hydrolysate to 90-95 DEG C; e, liquid-solid separation: carrying out liquid-solid separation on the sesame cake enzymatic hydrolysate which has undergone high-temperature enzyme deactivation and removing insoluble solids so as to prepare a sesame polypeptide liquid; f, condensation: condensing the sesame polypeptide liquid to prepare a sesame polypeptide concentrate; and g, drying: drying the sesame polypeptide concentrate so as to obtain a sesame polypeptide powder.

The invention provides a preparation method of peanut polypeptide, comprising the following steps: a, processing of raw materials: uniformly mixing water and a peanut cake crushed material, which is obtained after a low-temperature cold-pressed peanut cake is crushed, so as to obtain a peanut cake suspension; b, homogenization of the suspension: homogenizing the peanut cake suspension to prepare a peanut cake mixed liquor; c, thermal-insulation enzymatic hydrolysis: adding a mixed the peanut cake mixed enzyme liquid of AlcaLase enzyme and papain into the peanut cake mixed liquor to carry out enzymatic hydrolysis at the temperature of 50-60 DEG C at pH of 7.0-8.5 for 6-8h so as to prepare a peanut cake enzymatic hydrolysate; d, high temperature sterilization: rapidly heating the peanut cake enzymatic hydrolysate to 90-95 DEG C; e, liquid-solid separation: carrying out liquid-solid separation on the peanut cake enzymatic hydrolysate which has undergone high-temperature enzyme deactivation and removing insoluble solids so as to prepare a peanut polypeptide liquid; f, condensation: condensing the peanut polypeptide liquid to prepare a peanut polypeptide concentrate; and g, drying: drying the peanut polypeptide concentrate so as to obtain a peanut polypeptide powder.

The invention provides a preparation method of sunflower seed polypeptide, comprising the following steps: a, processing of raw materials: uniformly mixing water and a sunflower seed cake crushed material, which is obtained after a low-temperature cold-pressed sunflower seed cake is crushed, so as to obtain a sunflower seed cake suspension; b, homogenization of the suspension: homogenizing the sunflower seed cake suspension to prepare a sunflower seed cake mixed liquor; c, thermal-insulation enzymatic hydrolysis: adding a mixed the sunflower seed cake mixed enzyme liquid of AlcaLase enzyme and papain into the sunflower seed cake mixed liquor to carry out enzymatic hydrolysis at the temperature of 50-60 DEG C at pH of 7.0-8.5 for 6-8h so as to prepare a sunflower seed cake enzymatic hydrolysate; d, high temperature sterilization: rapidly heating the sunflower seed cake enzymatic hydrolysate to 90-95 DEG C; e, liquid-solid separation: carrying out liquid-solid separation on the sunflower seed cake enzymatic hydrolysate which has undergone high-temperature enzyme deactivation and removing insoluble solids so as to prepare a sunflower seed polypeptide liquid; f, condensation: condensing the sunflower seed polypeptide liquid to prepare a sunflower seed polypeptide concentrate; and g, drying: drying the sunflower seed polypeptide concentrate so as to obtain a sunflower seed polypeptide powder.

The invention discloses a waste alkali solution recovery method, which is mainly applicable to recovery of waste alkali solution generated during dipping and pressing of pulp in viscose fiber production, and is also applicable to recovery of alkali solution generated during papermaking, pulping, dying, spinning and the like in textile industries. Through procedures of two-stage coagulation, two-stage precipitation and filtration, oxidization, adsorption and the like, the waste alkali solution recovery method ensures continuity of production, reduces filtration difficulties, reduces energy consumption, and enables the production to be more stable. After the alkali solution is treated by the method, the content of impurities in the alkali solution is less, and the chromaticity of the alkali solution is low, thereby realizing the aim of recycling waste alkali. According to the method, equipment investment and energy consumption are low, and operation expense is low; and the method has the characteristics of environmental friendliness, safety and high production efficiency, has remarkable benefits, and can reduce the pollution of the waste alkali on environment.

The invention discloses a refining method of rice oil. The refining method comprises the following steps: degumming; primarily decoloring; primarily deacidifying; dewaxing; degreasing; secondarily deacidifying; secondarily decoloring and deodorizing, wherein the degumming step specifically comprises the following steps: carrying out reaction on heated crude oil and phosphoric acid in an acid reaction tank, then, adding alkaline liquor to mix for centrifugal separation, then, adding water to mix for washing centrifugal separation, and finally vacuum-drying; the primarily deacidifying step is physical deacidifying; the secondarily deacidifying step specifically comprises the following steps: quickly mixing heated oil with alkaline liquor for centrifugal separation, then, adding water for washing centrifugal separation, and finally vacuum-drying. According to the method, in the degumming and secondarily deacidifying steps, alkaline liquor is added to remove part of free fatty acids in grease, thus, not only is oryzanol remained, but also part of pigments can be adsorbed. In the degumming, primarily deacidifying and secondarily deacidifying steps, physical refining and chemical refining are organically combined, so that not only is oryzanol remained and the color reduced, but also the product yield is effectively improved.

The invention relates to a decolouring silica gel regenerator and a regeneration method. The silica gel regenerator comprises a vertical heater body for filling silica gel. The upper portion of the heater body is provided with a hot air device for providing hot air. The lower portion of the heater body is equipped with an air-discharge mechanism. Thermal current which is provided by the hot air device and is in the core space of the heater body is discharged out of the heater body through the air-discharge mechanism from top to bottom. The silica gel regeneration method contains the following steps of: filling silica gel into the heater body; heating silica gel by the use of firewood as fuel until thermal current flows from the top of silica gel to the bottom and is discharged out of the bottom of the heater body; stopping heating after the thermal current at the bottom of the heater body contains no steam or oil, cooling, and discharging to obtain the product. The invention can guarantee regeneration and activation effects of silica gel and solves technical problems unsolved by technical personnel in the field for a long time. According to the invention, present silica gel and products of the same kind can be activated and regenerated, and use cost of products is greatly reduced.

The invention provides a cyanogen removing agent and a preparation method and application thereof. The cyanogen removing agent is prepared from activated carbon, FeSO4.7H2O, polymeric ferric sulfate,polymeric aluminum chloride, SnCl4, CuSO4.5H2O, Co(NO3)2.6H2O and polyacrylamide. The FeSO4.7H2O and the polymeric ferric sulfate have a good flocculation effect in water; the SnCl4, the CuSO4.5H2O and the Co(NO3)2.6H2O are heavy metallic salts and can be subjected to complexing with inorganic cyanide in coking wastewater to form a strong complexing compound; through the synergistic effect of thepolymeric aluminum chloride and the polyacrylamide, the flocculation speed of the coking wastewater is increased, and the sedimentation time is effectively shortened; by adopting the activated carbon,the adsorbing effect on organic substances such as pigment in the coking wastewater is achieved, after the activated carbon is compounded with a ferric salt and heavy metallic salts, cyanide not being subjected to complexing is adsorbed, and the cyanogen removing effect is enhanced; and according to the cyanogen removing agent, adopted raw materials are low in cost and wide in obtaining path, andmeanwhile, the cyanogen removing agent has the advantages that the medicine putting amount is small, effect taking is quick, the cyanogen removing effect is significant, and the sedimentation speed is high.

The invention discloses a method for quickly separating oyster peptide from oyster enzymolysis liquid. The method comprises the following steps: adding an emulsifier and lipase into enzyme-deactivated oyster enzymolysis liquid, uniformly mixing, and performing hydrolysis at the temperature of 35 to 50 DEG C for 4 to 8 h to obtain a secondary enzymolysis product of oyster; adding yeast cell wall polysaccharides and active carbon into the secondary enzymolysis product, oscillating during heat preservation at the temperature of 50 to 60 DEG C for 0.5 to 1.5 h, performing vacuum suction filtration through a filter membrane of 0.5 [mu]m, and collecting filtrate to obtain the oyster peptide. According to the method, the lipase is used for hydrolyzing fat in an enzymatic hydrolysis system to break the emulsification balance in the enzymatic hydrolysis system and drive a water phase to be separated from an oil phase. The hydrolysis conditions of the method are mild, and the process is safe and controllable; large-scale industrial production can be realized.

The invention discloses a method for preparing a sulfated water-soluble dietary fiber employing extrusion. The method comprises the following steps: (1) with an apple dietary fiber as a raw material, adding a sulfating agent by virtue of a screw extruder, and carrying out extruding esterification reaction, so as to obtain modified apple dietary fiber; and (2) carrying out water extract and alcohol precipitation, and dialysis and purification to obtain the sulfated water-soluble dietary fiber. The method disclosed by the invention has the advantages that great use of an organic solvent is avoided; and the sulfated product is safe, and simple in technological process. The sulfated water-soluble dietary fiber is prepared by virtue of a dry heating method of the screw extruder; the substitution degree of esterification of the prepared product is 0.51-0.79; and the sulfated water-soluble dietary fiber has good oxidation resistance, antiviral property and antitumor activity.

The invention relates to the field of pine resin processing and discloses a pine resin processing method with pine resin processing yield increased. The method includes the steps of pre-treatment, dissolution, water washing, clarification, residue recovery, distillation, and finish product collection. In the method, a raw material is pre-treated and is water-washed under supersonic wave; and during the dissolution, an internal heating coil is employed for heating the raw material, zeolite added to break the raw material; and meanwhile, through the residue recovery, vacuum distillation and the like, efficiency of pine resin processing is improved and yield of pine resin is increased. The method is free of big modification on devices and can achieve stable control, thereby achieving stable production and yield increasing.

The invention discloses a preparation method of sulfated apple water-soluble dietary fiber. The preparation method comprises the following steps: (1) extruding and modifying apple dietary fiber, and then extracting the water-soluble dietary fiber by adopting water extraction and alcohol precipitation; and (2) fast and efficiently preparing the sulfated apple water-soluble dietary fiber under ultrasonic-assisted conditions by adopting sulfamic acid-N,N-dimethylformamide method. The preparation method has the advantages that the reaction conditions are mild, the operation is simple, the toxicity of a product is low and the like, the substitution degree of the prepared sulfated apple water-soluble dietary fiber is 0.23-0.97, and the sulfated apple water-soluble dietary fiber has excellent oxidization resistance and anti-tumor activity.

The invention discloses a preparation method of an ultraviolet absorbent UV-329. The preparation method comprises the following steps that an azo intermediate shown as the formula (I) is reduced into an oxynitride shown as the formula (II) by a reducing agent; then, the oxynitride is reduced into a product shown as the formula (III) by a reducing agent; the reducing agent is formed by sintering metal powder and an adsorbent, wherein the formula (I), the formula (II) and the formula (III) are shown as the accompanying drawing. The preparation method has the beneficial effects that the method provided by the invention has the advantages that the consumption of the metal powder is low; the environment pollution is little; the operation is convenient and simple; the product yield is high.

A process for preparing isovitamin C by membrane-resin method includes such steps as membrane filtering of the fermented liquid of sodium diketogluconate, ion exchange and concentrating by ion exchange resin, esterifying, converting and refining.

The invention discloses a method for whitening agar under assistance of an enzymatic method. Gracilaria verrucosa is taken, put in an alkaline solution and treated at the constant temperature for 2-5h, the alkaline solution is removed, and the gracilaria verrucosa is blanched to be neutral; water and oxalic acid are added, the pH is adjusted with acid to range from 4.5 to 6.5, complex enzyme is added at the temperature of 45-60 DEG C, the gracilaria verrucosa is treated at the constant temperature for 1-3 h, an enzyme solution is removed, and the gracilaria verrucosa is rinsed to be neutral;a metal chelating agent is added, metal ions are removed, and the gracilaria verrucosa is filtered and rinsed to be neutral; a sodium hypochlorite solution is added, and the gracilaria verrucosa is treated for 20-60 min, filtered and rinsed to be neutral; water is added, and the gracilaria verrucosa is boiled to be completely molten and then filtered for residue removal; a gel solution is rapidlycooled, slit, subpackaged, subjected to oil-pressure dewatering, dried, crushed and sieved, and powder is collected. The method is applied to agar extraction through biological blanching under assistance of chemical blanching, usage of chemical agents is reduced, harm to body health is reduced, pollution to the environment is reduced, the production cost is saved, and the method has great significance for sustainable development of agar production enterprises.

The invention belongs to the technical field of lubricating oil, and relates to a method for regenerating waste lubricating oil. The method comprises the following steps: 1) feeding waste lubricatingoil into a plant; 2) carrying out flocculation and aggregation; 3) carrying out demulsification; 4) carrying out standing; 5) carrying out heating, 6) carrying out centrifugation; 7) carrying out heating; 8) carrying out acid refining; 9) carrying out alkaline neutralization; 10) carrying out clay refining; and 11) carrying out blending. According to the method disclosed by the invention, the yield of the lubricating oil is increased by reducing a distillation process, and the yield of the lubricating oil is increased to 89%-95%, which is increased by 10-15% compared with a yield in a common regeneration technology, and certain social and economic benefits are achieved.

The invention provides a preparation method of a cottonseed polypeptide. The method includes the steps of: a. raw material treatment: crushing a low-temperature cold-pressed degreased cottonseed cake, and mixing the crushed cottonseed cake with water uniformly to obtain a cottonseed cake suspension; b. homogenizing of the suspension: homogenizing the cottonseed cake suspension to obtain a cottonseed cake mixed solution; c. heat preservation enzymolysis: adding a mixed enzyme solution of AlcaLase enzyme and papain, carrying out enzymolysis at 50-60DEG C and under a pH value of 7.0-8.5 for 6-8h, thus obtaining an enzymatic hydrolysate of the cottonseed cake; d. high temperature sterilization: rapidly raising the temperature of the enzymatic hydrolysate of the cottonseed cake to 90-95DEG C; e. liquid-solid separation: subjecting the cottonseed cake's enzymatic hydrolysate that undergoes high temperature enzyme deactivation to liquid-solid separation, then removing insoluble solids so as to obtain a cottonseed polypeptide solution; f. concentration: concentrating the cottonseed polypeptide solution to obtain a concentrated cottonseed polypeptide solution; and g. drying: drying the concentrated cottonseed polypeptide solution to obtain cottonseed polypeptide powder.

The invention relates to a method of recycling anhydrous sulfate sodium from de-sulfurized lead paste filtration, belonging to the technical field of resource recovery and utilization process, which avoids the disadvantages that waste sulfate is used and low concentration sulfate sodium is emitted into the environment. The method of the invention comprises the following steps: desulfurized lead paste filtration collection, sodium carbonate neutralization, first time heavy metal removal, filtration PH value adjustment, second-time heavy metal removal, decolorizing step, and vaporization and crystallization step; the device comprises a transfer tank, a neutralization tank, a first-stage purifying tank, a PH adjusting tank, a second-stage purifying tank, a decolorization tank, a filtration collection tank and a vaporization crystallization system; the waste sulfate collection tank is connected with a waste sulfate pre-processing tank, the waste sulfate pre-processing tank is respectivelyconnected with the neutralization tank and the PH adjusting tank. The recycling method has the advantages that anhydrous sulfate sodium can be directly recycled, the waste sulfate is used to neutralize the carbonate sodium remained in the filtration; the heavy metal ions and other ions in the filtration are removed according to two steps, so that the grade of obtained anhydrous sulfate sodium is equal to or larger than industrial grade.

The invention discloses a preparation method of an ultraviolet light absorber UV-P. The preparation method includes the following steps that an azo intermediate shown in the formula (I) is reduced into nitric oxide shown in the formula (II) through a reducing agent, nitric oxide is reduced into a product shown in the formula (III) through the reducing agent, and the reducing agent is formed by sintering metal powder and an adsorbent, wherein the formula (I), the formula (II) and the formula (III) are shown in the description. The preparation method has the advantages that the use amount of the metal powder is small, environmental pollution is low, operation is convenient and easy, and the yield of the product is high.

The invention relates to a method for reducing the acid value of bio-oil materials, which comprises the following steps of evenly mixing bio-oil materials and alcohol amine compound, standing, layering, separating and collecting the bio-oil materials with reduced acid value. The bio-oil materials can be natural oil or products of ester exchange reaction of the oil. The method has high acid value reduction effect without generating a great deal of waste water, is convenient for environment protection, can effectively remove peculiar smell in biodiesel and has decoloration effect.

The invention provides a system and a method for advanced treatment of wastewater containing high-concentration organic amines. According to the system, an ozone composite oxidation tank, a heterogeneous catalytic oxidation reactor and a sedimentation tank are provided, can effectively decolorize organic amine wastewater and improve the biodegradability of the organic amine wastewater, and providea reliable treatment mode for industrial production; wherein a pipeline containing the organic amine wastewater is used for feeding the organic amine wastewater into the ozone composite oxidation tank; under the conditions of certain pH, temperature and time, wastewater treated after ozone composite oxidation and decoloration is conveyed into the heterogeneous catalytic oxidation reactor througha pipeline; and further, reaction of the organic amine wastewater with a residual oxidant in ozone oxidation in the heterogeneous catalytic oxidation reactor is carried out, so that residual organic matters are catalytically degraded under the action of a catalyst, the degraded wastewater is introduced into a sedimentation tank to be precipitated, and the precipitated wastewater is discharged intoa biochemical treatment system.

The invention discloses a high-purity esomeprazole sodium preparation method. The method comprises the following steps: A) dissolving esomeprazole sodium in a mixed solvent of an organic solvent A and an organic solvent B; B) dropping a sodium hydroxide aqueous solution, stirring the materials for crystallization; C) filtering the material, stirring a filter cake by a mixed solvent of acetone and an organic solvent C and washing the filter cake; and D) filtering the material, and performing vacuum drying on the filter cake to obtain the product. The method has the advantages of good repeatability, simple operation, high products yield, and high purity, and is suitable for industrial production.

The invention discloses a preparation method of sulfated apple water-soluble dietary fiber. The preparation method comprises the following steps: (1) extruding and modifying apple dietary fiber, and then extracting the water-soluble dietary fiber by adopting water extraction and alcohol precipitation; and (2) fast and efficiently preparing the sulfated apple water-soluble dietary fiber under ultrasonic-assisted conditions by adopting sulfamic acid-N,N-dimethylformamide method. The preparation method has the advantages that the reaction conditions are mild, the operation is simple, the toxicity of a product is low and the like, the substitution degree of the prepared sulfated apple water-soluble dietary fiber is 0.23-0.97, and the sulfated apple water-soluble dietary fiber has excellent oxidization resistance and anti-tumor activity.

The invention discloses a municipal discharged sewage disinfection and decolorization device, which comprises a disinfection tank, the bottom of the disinfection tank is provided with an upward concave conical part, the bottom of the conical part is provided with a vertical pipe communicated with the interior of the disinfection tank, and the upper surface of the conical part is fixedly provided with waterproof ultraviolet sterilization lamps which are annularly distributed at equal intervals. The top of the disinfection tank is of an opening structure, a flange ring is arranged at the opening position of the top of the disinfection tank, a plug cap is arranged at the bottom of the vertical pipe, a liquid drainage pipe is arranged at the bottom position of the side wall of the vertical pipe, a blow-off pipe is arranged at the bottom position of the side wall of the disinfection tank, and an annular net plate is arranged at the top position of the inner wall of the vertical pipe. A filter cartridge is inserted into the inner wall of the annular net plate, and an annular block is welded to the lower end of the filter cartridge. According to the invention, sewage can be filtered, a certain decoloration effect is achieved, water can be disinfected, part of water reversely impacts the annular screen plate, the screen plate is prevented from being blocked, and a self-cleaning effect is achieved.

The invention relates to the technical field of drinking water treatment and particularly relates to a drinking water purification method. The method comprises the following steps: inoculating pullulanase into drinking water for high-pressure processing to kill microorganisms, crushing marmor serpentinatum and mixing with the drinking water and straight-chain starch evenly; introducing krypton into the drinking water, killing pathogenic bacteria, crushing lapis chloriti and mixing with the drinking water; introducing a mixture into a supercritical CO2 reaction kettle to remove fluorine; inoculating amylase into the drinking water for preliminary purification of water; feeding the drinking water into a clarification tank for high-pressure pressure-holding clarification and inoculating laccase into the drinking water for decolorization; and finally carrying out flash evaporation for enzyme deactivation. The total bacterial count in the finally obtained drinking water is lower than or equal to 15CFU / ml; coliform and pathogenic bacterium are not detected; the fluorine content is lower than 0.7mg / L; a foreign flavor is avoided; the 'b' reading of a hunter chromometer is smaller than 5.0; and the NTU turbidity value is lower than 5.0.

The invention discloses a wine brewing waste liquid decolorizing agent and a preparation method thereof. The preparation method comprises the steps that loofah sponge is placed in an alkaline solutionto be subjected to heat treatment, and then washing, drying and smashing are conducted to obtain loofah sponge powder; and dispersing butyl titanate, zinc salt, acetylacetone and thiourea into absolute ethyl alcohol, then adding inorganic acid, water and the loofah sponge powder, stirring, and then standing to obtain sol; calcining the sol to prepare the wine brewing waste liquid decolorizing agent, wherein the alkaline solution is composed of an alkaline compound, water and alcohol. The wine brewing waste liquid decolorizing agent has the characteristics of directly degrading dark impuritiesand can be directly and repeatedly used for multiple times, and the preparation method has the characteristics of easily available raw materials and simplicity in operation.

The invention discloses a preparation method of a colorless transparent sodium polyacrylate dispersing agent, which comprises the following steps: initiating polymerization under the assistance of light in the initial stage of polymerization to synthesize low-molecular-weight polyacrylic acid, continuously irradiating ultraviolet light or visible light in the process of neutralizing the polyacrylic acid with sodium hydroxide, and finally, adding a certain amount of benzoyl peroxide into the synthesized polymer to achieve corresponding decolorization and corrosion prevention effects. The sodiumpolyacrylate dispersing agent prepared by the invention is in a colorless and transparent state, the chromaticity of the sodium polyacrylate dispersing agent is excellent by adopting a spectrophotometer, and the sodium polyacrylate dispersing agent achieves a good effect in the application field. The dispersing agent is simple in preparation method and low in cost, and has the characteristics ofstable product performance and good dispersing performances.

The invention discloses a method for synthesizing azithromycin. Using erythromycin thiocyanate as the starting material, after oximation, free erythromycin oxime is obtained, and the rearrangement, reduction, acidification and methylation reactions are directly carried out to obtain azithromycin. The whole reaction is carried out in one pot; the rearrangement reaction is qualified Then add a small amount of organic solvent to extract once, and directly carry out the reduction reaction. The reduction reaction reagent is potassium borohydride aqueous solution, and the configuration method of potassium borohydride solution is a small amount of multiple times at low temperature. To 9, separate layers, wash the organic layer once, add sorbitol aqueous solution, quickly add hydrochloric acid dropwise at low temperature until the pH is 1 for acidification, and after holding the heat for three minutes, quickly add liquid caustic soda dropwise until the pH is 10. After washing with water, azithromycin was obtained through methylation reaction. The whole reaction route of the present invention is relatively mild, the product color is white, the purity is high, the yield is high, the pollution is small, and the product is suitable for industrialized production.