56results about How to "High quality and purity" patented technology

The present invention discloses preparation process of high purity scutellarin from baicalin. Baicalin is added into water solution of sulfuric acid and reacted at 50-70 deg.c for 10-15 min to obtain separated coarse crystal product; and the coarse product is purified with acetone to obtain high purity scutellarin. Thus prepared scutellarin product, high efficiency liquid phase test process shows, has scutellarin content of 96 % or over. The process has short reaction time, mild reaction condition, simplicity and low cost, and is suitable for industrial production.

The invention discloses a method for recovering platinum and rhenium from a platinum-rhenium catalyst. The method comprises the following steps of 1, carrying out electrodissolution reaction on the platinum-rhenium catalyst so as to obtain slurry; 2, centrifuging the slurry so as to obtain supernatant and precipitates; 3, adjusting the pH value of the supernatant to be 1-4 and then carrying out adsorption with resin; 4, after mixing ammonia water and an ammonium chloride solution, carrying out desorption on the resin subjected to absorption and carrying out evaporation and concentration on anobtained desorption solution so as to obtain ammonium rhenate; and 5, leaching the precipitates by using aqua regia, carrying out centrifuging to obtain supernatant, obtaining platinum-contained precipitates from the supernatant by adopting an ammonium chloride precipitation method and then carrying out hydrazine hydrate reduction so as to obtain platinum powder. The method has the advantages thatthe rhenium in the platinum-rhenium catalyst is selectively dissolved through electrochemical action, so that the rhenium and the platinum are separated and then are recovered separately through an ion exchange method and an aqua regia dissolution-ammonium chloride precipitation method, and therefore the separation efficiency of the rhenium and the platinum can be improved, and the quality and the recovery rate of obtained products are relatively high.

The invention discloses a method and device for preparing nitrogen-doped carbon nanotubes by using microwave vapor deposition. The method comprises the following steps that carbon nanotube powder is placed in a closed cavity, and the cavity is vacuumized; nitrogen gas is introduced to the cavity, the flow rate and air pressure of the nitrogen gas are adjusted, and meanwhile microwave irradiation is conducted to make the gas in the cavity absorb microwave energy and be excited to generate plasma; nitrogen atoms after plasma treatment can be doped into the surfaces and internal structures of carbon nanotubes to form the nitrogen-doped carbon nanotubes, and by controlling the microwave power and nitrogen doping time, the nitrogen carbon nanotubes with different nitrogen contents are obtained.A nitrogen gas source is subjected to plasma treatment by adopting a microwave plasma technology. Since the microwave power and the energy density are high and radical groups have high activity, thegas can be easily dissociated; the nitrogen carbon nanotubes prepared by means of the method are high in quality and purity and facilitates the test and characterization of ferromagnetic properties, optical properties and other properties, and prepared samples show good ferromagnetism.

The invention discloses a bronopol refining process. The process comprises the following steps: performing reduced pressure distillation on a bronopol crude product crystalline liquid prepared by a conventional method to obtain a concentrate, adding crystallization agent into the concentrate, and crystallizing to obtain a sodium bromide product; further distilling the mother solution, adding pure water, and crystallizing to obtain a bronopol product; and performing resin adsorption on the residual bronopol in the obtained mother solution, resolving, and returning to the bronopol crude product crystalline liquid, wherein in the whole technical process, no loss of bronopol exists, and wastewater is directly subjected to biochemical treatment. According to the invention, sodium bromide and bronopol products with purities of 99% or above can be obtained, and the yield of the bronopol is more than 99%.Compared with the existing one-step reduced pressure distillation and crystallization process, the bronopol refining process increases the bronopol yield and lowers the bronopol and sodium bromide contents in wastewater, so that the wastewater can be directly discharged into a biochemical system, thereby lowering the wastewater treatment cost and reducing environmental pollution.

The invention relates to the technical field of manufacturing of electronic-grade isopropanol. Aiming at solving the problem that the process steps of the isopropanol preparation process are tedious,the invention discloses a production system of electronic grade isopropanol. The production system comprises a raw material conveying unit, a molecular sieve adsorption unit, an evaporation tank, a first rectification unit, a second rectification unit and a filtering unit, which are sequentially connected. A modified adsorption material is arranged in the molecular sieve adsorption unit, a first rectification filler area is arranged in the first rectification unit, a second rectification filler area is arranged between an inlet and an outlet in the inner side of the second rectification unit,the raw material conveying unit is further provided with a feed port A, and the filtering unit is further provided with a discharge port B. One-step dehydration is adopted in the preparation process,the modified adsorption material with magnetic directional adsorption capacity and ultra-large specific surface energy is adopted, electronic-grade isopropanol with high isopropanol purity and low metal ion content is finally obtained, the electronic-grade isopropanol with excellent stability is prepared, and the production process is simple and efficient.

The invention discloses a preparation method of high-purity micron-scale spherical molybdenum powder. The preparation method comprises the following steps of S1, sequentially dropwise adding ammoniumhydroxide into ammonium paramolybdate and ageing, carrying out purification by a resin column adsorption to obtain a purified ammonium paramolybdate solution; S2, adjusting the pH of the purified ammonium paramolybdate solution to be neutral, adding citric acid to adjust the pH value to be 1.0; S3, carrying out airflow-type atomization on the purified ammonium paratungstate solution with the pH value of 1.0 to obtain ammonium paramolybdate powder; and S4, placing the ammonium paramolybdate powder in a tubular rotary furnace to be reduced to obtain the molybdenum powder. According to the method, ammonium paramolybdate is prepared into a solution to purify, the quality purity of the molybdenum powder is improved from the source, then the surfactant citric acid is added, the surface tension of the purified ammonium paramolybdate solution is reduced, more uniform drops with higher spherical degree, smaller particle size of the ammonium paramolybdate solution is generated in the airflow type atomization process, so that the spherical degree of the molybdenum powder is improved, molybdenum powder which is high in purity, micron-sized and uniform in particle size distribution is obtained;and meanwhile, the granularity controllability of the molybdenum powder is improved.

A method for purifying the acetyl citrate relates to the purification technique and comprises the following steps: (1) the citrate reacts with an excessive amount of acetic anhydrides and then is preliminarily dehydrated in a reaction vessel on the vacuum condition after being deacidified, neutralized and washed so as to obtain the crude products of the acetyl citrates; (2) the crude products are subject to the secondary treatment utilizing a film evaporator, the vacuum degree is controlled to range from 100Pa to 13300Pa and the flow of the film evaporator ranges from 2kg/m<2> h to 200kg/m<2> h; the film evaporator and the preheater are heated by the steam or heat conduction oil; when the steam is used for heating, the heating steam pressure of the preheater is controlled to range from 0.5kgf/cm<2> to 1.5kgf/cm<2> and the steam pressure of the evaporator ranges from 2.0 to 5.0kgf/cm<2>; when the heat conduction oil is used for heating, the temperature of the heat conduction oil ranges from 100 to 140 DEG C. The method is very effective for reducing the purities in the acetyl tri-n-butyl citrate and lowering the water and acid value so as to enhance the quality purity of the acetyl citrate.

The invention discloses a recovery device for cathode and anode materials of a lithium ion battery. The structure of the recovery device comprises a motor bottom case groove, a polar plate winding drum, a grinding roller, a clamping shaft frame, a beam plate, a side ring slot vertical plate, a drawer plate cut-off cabinet and a heat exchange bottom groove. The recovery device achieves that the polar plate winding drum and the drawer plate cut-off cabinet are matched to pull out the cathode and anode material rolled plates of the lithium ion battery, the stretched surface enters the polar platewinding drum and the upper and lower sliding surfaces of the grinding roller to press and rotate a surface-grinding cleaning block layer, the effects of eliminating and cleaning the thickness of an upper additive and a lower additive and sweeping powder particles on the surface of an iron-copper incineration plate are formed, a cathode and anode material plate recycling and outputting effect is formed, and after the cathode and anode material plates of the battery are pulled out, the splitting hydrolysis operation of the lithium battery is supported, the free state of organic matters with chemical properties can be decomposed and ionized, the cathode and anode plates of the lithium ion battery taken out from a terminal can be forged, remelted and deformed, the recycling utilization rate is high, the pollution degree of the battery is low, and the environment-friendly treatment is achieved.

The invention relates to a reactive distillation method and device for 4EMD (4-ethyl-2-methyl-1,3-dioxolame) production. A reactive distillation tower comprises a distillation section and a reactive distillation section, wherein a 1,2-butanediol feed port is formed in the top of the reactive distillation section, acetaldehyde is fed into tower bottom, a reaction product is produced from tower top and enters an acetaldehyde recovery tower for acetaldehyde separation, a 4EMD and water mixture after acetaldehyde separation enters a distillation tower through a tower top phase splitter or one tower plate of the 4EMD distillation tower, by means of the tower top phase splitter, an organic phase flows back, an aqueous phase is produced, and a 4EMD product is obtained from the tower bottom. The method and the device have the advantages that the reaction and the separation coupling are performed in the same equipment simultaneously, so that the equipment investment can be saved, energy consumption can be reduced, the forward reaction is promoted, and a high reaction conversion rate is acquired. By means of the phase splitter arranged at the tower top, water can be removed very well, the 4EMD product with high purity is obtained, and meanwhile, the high recovery rate of the 4EMD product can be guaranteed.

The invention discloses a preparation method of a fiber-wound reinforced graphite heating tube structure. The method comprises the following steps: 1, pretreating a graphite heating tube; 2, winding continuous carbon fiber dry yarn onto the pretreated graphite heating tube; 3, forming a dry yarn winding reinforcing layer; 4, preparing an antioxidant coating to obtain a fiber-wound reinforced graphite heating tube structure. The invention also discloses a fiber-wound reinforced graphite heating tube structure prepared by the method. According to the invention, the pretreated graphite heating tube is subjected to dry yarn belt tension winding, and then densification and surface coating treatment are respectively carried out by sequentially combining CVI and CVD processes, so that the fiber winding reinforced graphite heating tube has better breaking strength, tensile strength, thermal shock resistance and oxidation resistance, the service life is obviously prolonged, and the preparationperiod is shortened; in addition, the fiber winding reinforced graphite heating tube is simple and reliable in structure, and meets the application requirements of various types of graphite heating tubes.

The invention relates to a preparation method of a potential anti-new coronavirus drug monaprevir, which comprises the following process steps: step (1) synthesis of an intermediate ML-B: dissolving a material ML-A in an organic solvent, and reacting with hydroxylamine salt to obtain the intermediate ML-B; (2) synthesizing an intermediate ML-C: reacting the intermediate ML-B obtained in the step (1) with anhydride, and carrying out ester exchange to obtain the intermediate ML-C; and (3) synthesis of monaprevir: carrying out a deprotection reaction on the intermediate ML-C obtained in the step (2) to obtain monaprevir. The preparation method is simple to operate and high in yield. According to the embodiment of the invention, the product obtained by the preparation method is quite high in quality and purity, tedious product purification operation is not needed, and the production efficiency of the product is greatly improved. Therefore, the preparation method provided by the invention is a process method particularly suitable for large-scale production, and can effectively meet the current requirements.

The invention provides a method for industrially preparing high-purity ergothioneine. The method comprises the following steps of: carrying out hot water treatment on mycelium, carrying out solid-liquid separation, and performing collecting to obtain feed liquid containing ergothioneine; carrying out vacuum concentration, filtration, ultrafiltration, decoloration, desorption and concentration on the feed liquid containing ergothioneine; performing chromatographic purification on an ergothioneine desorption concentrated solution, collecting a target peak, performing concentrating until the solution is dry, and dissolving a product in water to obtain an ergothioneine sample solution; desalting and decolorizing the ergothioneine sample solution through ion exchange resin, and performing collecting to obtain a desalted ergothioneine concentrated solution; and carrying out coarse crystallization and recrystallization on the desalted ergothioneine concentrated solution, and performing drying to obtain high-purity ergothioneine crystal powder. According to the method, a large amount of high-purity ergothioneine is prepared from the mycelia of the pleurotus ostreatus CGMCC No.23071, the product quality of the ergothioneine is ensured. The method is particularly suitable for large-scale production of the ergothioneine, so that the requirements of the product in the fields of food, cosmetics, health care, medicine and the like are met.

The invention belongs to the field of natural organic chemistry, and relates to a method for enzymatically extracting high-purity resveratrol from Daxinganling wild blueberries. The invention uses the blueberry fruit picked in Daxing'an Mountains as a raw material, and obtains a high-purity resveratrol crystal powder product through a simplified process of biological enzymolysis reaction, water extraction, alcohol precipitation, deep extraction, separation, concentration and drying. The method of the invention has the characteristics of sufficient biological enzymolysis, short time consumption, low energy consumption cost, high operation safety, full use of raw materials and organic solvents, waste liquid mainly being water, good for environmental protection, and easy industrialization and application. The resveratrol crystal powder product prepared by the method of the invention has a high purity, which can reach more than 98 percent; and a high yield, which can reach 1.40 percent.

The invention discloses a purifying method of biodiesel. The purifying method is characterized by purifying crude biodiesel by adopting a percolation system, thus obtaining the biodiesel, wherein thepercolation system at least comprises one percolation tower taking thermal activated bauxite as filler. According to the purifying method disclosed by the invention, the percolation tower taking the thermal activated bauxite as the filler is adopted for percolating and purifying the crude biodiesel, and the adsorption ability on impurities such as polar molecular water, methanol, sterol, glycerinum, phospholipid, acid-base catalyst residue and free fatty acid in the crude biodiesel is increased by utilizing strong adsorption and filtering functions and high purifying resolution of the thermalactivated bauxite on the impurities, so that the biodiesel with higher quality and higher purity is obtained; meanwhile, the acid value of the biodiesel is reduced, mixing of poor impurities is avoided, the quality of the biodiesel is increased, and the purifying efficiency is high.