920 results about "Propanol" patented technology

An absorbent retail paper product comprised of cellulosic fibers having a concentration of 1, 3-dichloro-2-propanol that is not detected to 50 ppb, as measured using the ACOC official method 2000.0150, a concentration of 3-monochloro-1, 2-propanediol that is not detected to 1000 ppb, as measured using the ACOC official method 2000.0150, as measured by the "adipic acid test", as measured by the ACOC official method 2000.0150, as measured by the ACOC official method 2000.0150, as measured by the ACOC official method 2000.0150, as measured by the ACOC official method 2000.0150, as measured by the ACOC official method 2000.0150, as measured by the ACOC official method 2000.0150. Polyaminoamide-epihalohydrin at a concentration of not detected to 0.09% has a lateral wet strength of from 80 n / m to 200 n / m wherein all of the cellulosic fibers contained in the absorbent paper product are non-synthetic, the cellulosic fibers and the absorbent paper product are substantially free of formaldehyde.

The invention discloses a haloalkane dehalogenase mutant and an application thereof in degradation of 1, 2, 3-tribromopropane, haloalkane dehalogenase DhaA31 coded by dhaA gene of a Rhodococcus rhodococcus NCIMB 13064 strain is modified to obtain the haloalkane dehalogenase mutant F168W / I246C, the haloalkane dehalogenase mutant has high degradation efficiency on haloalkane pollutant 1, 2, 3-tribromopropane, and the haloalkane dehalogenase mutant has high degradation efficiency on haloalkane pollutant 1, 2, 3-tribromopropane under the condition of water phase normal temperature. The degradation rate of the alkyl halide dehalogenase mutant to 10 mM of 1, 2, 3-tribromopropane within 1 h reaches 100%, and the degradation rate of the alkyl halide dehalogenase mutant to 10 mM of 1, 2, 3-tribromopropane reaches 100%. The haloalkane dehalogenase mutant has high stereoselectivity on (R)-2, 3-dibromo-1-propanol, and the e.r. Value of the haloalkane dehalogenase mutant reaches 6: 94. The haloalkane dehalogenase mutant provided by the invention has high catalytic efficiency and high stereoselectivity, is beneficial to recognition and further degradation of downstream enzymes, and has a good application prospect in bioremediation of emerging haloalkane pollutants.

Provided herein, inter alia, are ruminant feed or feed additive compositions, and methods of using these feed or feed additive compositions to reduce methane emissions in ruminants while improving animal performance, these feed or feed additive compositions comprise one or more compounds that increase hydrogen production in ruminants, such as, but not limited to, 3-nitroxypropanol (3NOP) and one or more acetogens.

The invention discloses a synthetic method of glabridin with optical purity, which comprises the following steps: by taking (R)-3-acetoxyl-2-(2, 4-dimethoxyphenyl) propanol and 2-isopentenyl resorcinol as raw materials, carrying out Mitsunobu reaction to obtain a key intermediate compound I, then carrying out hydrolysis and iodination to obtain an intermediate compound II, and then carrying out cyclization to obtain the glabridin with optical purity. Reducing and removing a protecting group to obtain glabridin. By introducing the isopentene side chain, the reaction activity of an olefin functional group is reserved, a key site is provided for subsequent cyclization conversion, the precise spatial configuration of the product is ensured, and finally glabridin with optical purity is prepared. The method is short in route, low in cost, mild in reaction condition and suitable for industrial production.

The invention relates to the field of chemical synthesis, in particular to a production process of allyl diethylene glycol dicarbonate, which comprises the following steps: by taking allyl alcohol and dimethyl carbonate as raw materials, carrying out transesterification under the action of a core-shell catalyst to generate dipropylene carbonate; carrying out solid-liquid separation, carrying out reduced pressure distillation to recover methanol and dimethyl carbonate, and then carrying out second-step ester exchange reaction with diethylene glycol under the action of the same catalyst to generate allyl diethylene glycol dicarbonate; and finally, performing multi-stage reduced pressure distillation purification to obtain a high-purity product. According to the core-shell type catalyst, an MCM-41 molecular sieve is used as a carrier, an inner core is formed after amino modification and zirconium ion coordination, then an interface layer and a phenyl modified silicon dioxide shell are used for packaging, and the core-shell type catalyst has high activity, high selectivity and excellent structural stability. The method has the advantages of mild process conditions, recyclable catalyst, high product yield and excellent purity, and is suitable for industrial production.

The invention relates to the technical field of propyl alcohol rectification detection, and discloses a quality detection method and system for a propyl alcohol rectification process. According to the method, a data acquisition module acquires initial operation data, counts operation time and task requirements of partitioned tower section equipment, matches available time of the equipment with man-hour distribution of personnel, and generates a tower section equipment distribution result; the quality analysis module calculates key quality parameter detection time and interval based on the result, sorts a man-hour priority calling sequence, and generates a parameter sorting result; the constraint evaluation module is used for calculating material supply and equipment operation time, calibrating resource conflicts, adjusting a detection interval and generating a constraint adjustment parameter set; the progress monitoring module counts time node and parameter distribution difference values and recombines resource distribution to generate a rectification progress plan; and the deviation response module monitors environment and equipment states, calculates deviation, adjusts equipment allocation and time nodes, and generates a deviation correction result. The system realizes precise and dynamic management and control of quality detection in the propyl alcohol rectification process.

The invention discloses a preparation method of ulinastatin adsorption resin, and belongs to the technical field of adsorption resin. Comprising the following steps: (1) preparing a water phase: adding pure water, gelatin, cellulose, sodium chloride and lignin into a reaction kettle until the materials are fully dissolved; (2) preparing an oil phase, wherein the oil phase contains divinylbenzene, methyl acrylate, benzoyl peroxide, tert-butyl peroxy-2-ethylhexanoate, triallyl isocyanurate, tripropanol alkyl trimethacrylate and methylbenzene, and the oil phase is uniformly stirred and mixed with the methylbenzene and the trivinylbenzene, the methyl acrylate, the benzoyl peroxide, the tert-butyl peroxy-2-ethylhexanoate, the triallyl isocyanurate, the tripropanol alkyl trimethacrylate and the methylbenzene; (3) suspension polymerization: putting the oil phase into the water phase, and carrying out staged heating reaction; (4) amination reaction; (5) alkylation reaction; and (6) acid-base alcohol treatment. Compared with the existing resin, the resin disclosed by the invention has the characteristics of high adsorption exchange rate, high desorption rate and high desorption concentration on ulinastatin, and the yield of ulinastatin is increased by 1.17 times compared with that of D215 resin.

The present invention belongs to the technical field of microbial fermentation, and discloses the application of a compound bacterium agent of Lactobacillus rhamnosus and Bacillus licheniformis for reducing acids and higher alcohols, Lactobacillus rhamnosus, and in Baijiu. Lactobacillus rhamnosus L21 has a preservation number of: CGMCC NO. 32609, a preservation date of: November 13, 2024, and a preservation unit of: China General Microbiological Culture Collection Center. The use of the compound bacterium agent of Lactobacillus rhamnosus L21 and Bacillus licheniformis XDNZ_Bl_27 can effectively reduce organic acids such as lactic acid and propionic acid in the Baijiu fermentation system, and at the same time can also reduce the content of n-propanol in the fermented grains, which is beneficial to the regulation of acidity and higher alcohols in the process of Baijiu production.

The invention discloses a preparation method of PBA nanoparticle in-situ modified halloysite nanotube-polyethyleneimine cross-linked composite aerogel, which comprises the following steps: modifying halloysite nanotubes by using an epoxy silane coupling agent to obtain epoxidized HNTs, and further grafting ethylenediamine on the surfaces of the epoxidized HNTs to obtain HNTs rich in amino groups and hydroxyl groups; the preparation method comprises the following steps: respectively stirring and dissolving K4Fe (CN) 6.3 H2O and polyvinylpyrrolidone in a hydrogen chloride solution, then adding HNTs rich in amino groups and hydroxyl groups, ultrasonically dispersing uniformly, and reacting to obtain PBA-coated HNTs; the preparation method comprises the following steps: taking polyethyleneimine as a raw material, taking 1, 3-dichloropropanol as a cross-linking agent, adding an acid-binding agent, carrying out a cross-linking reaction on the polyethyleneimine and PBAatHNTs, finally freeze-drying a reaction solution, then removing the residual acid-binding agent and salts thereof by soaking and cleaning, and drying again to obtain a finished product of aerogel. According to the invention, the problems that polyethyleneimine is easy to remain in a solution and a nano-powder material is not easy to recover and reuse are solved, and the adsorption performance on heavy metal ions is improved.

The invention discloses a self-repairing composite floor for a clean room and a preparation method of the self-repairing composite floor, and the preparation method comprises the following steps: carrying out amination treatment on nano silicon dioxide and carbon quantum dots by using a silane coupling agent, and sulfonating polyethersulfone ketone by using concentrated sulfuric acid; the preparation method comprises the following steps: carrying out curing treatment on epoxy resin, an amine curing agent, N-hydroxyethyl maleimide and tetrakis (3-mercaptopropionic acid) pentaerythritol ester to obtain epoxy-mercaptan resin; the preparation method comprises the following steps: carrying out prepolymerization reaction on vacuum dehydrated polyester polyol, tetrahydroxyethyl ethylenediamine, furanpropanol, diisocyanate, a catalyst, 2, 2 '-thiodiethanol and hydroxyl silicone oil to obtain a star-shaped polyurethane prepolymer, adding epoxy-thiol resin, glyceryl borate, sulfonated polyethersulfone ketone, aminated silicon dioxide, aminated carbon quantum dots and an auxiliary agent, carrying out ultrasonic treatment, and carrying out drying to obtain the star-shaped polyurethane resin. The self-repairing coating material is obtained; and coating the self-repairing coating material on the surface of a base plate, and performing hot-pressing curing molding to obtain the self-repairing composite floor for the clean room.

The invention discloses a two-phase absorbent for capturing CO2, which is characterized by being prepared from the following components in percentage by mass: 25%-30% of N-(2-ethoxyl) ethylenediamine, 0%-3% of N-aminoethyl piperazine, 0%-3% of 2-(1-ethoxyl) pyridine, 10%-13% of N, N '-diethyl ethylenediamine, 15%-20% of N, N'-diethylethylenediamine, 5%-10% of N, N '-diethylethylenediamine, 5%-10% of N, N'-diethylethylenediamine and the balance of water. The invention relates to a cleaning agent which is prepared from the following components in percentage by weight: 1 to 5 percent of N, N-diethylhydroxylamine, 1 to 5 percent of pentamethyldiethylenetriamine, 0 to 2 percent of tert-butylamine ethoxyethanol, 0 to 3 percent of 2-amino-2-methyl-propyl alcohol, 5 to 8 percent of sulfolane, 5 to 8 percent of dimethyl ether, 5 to 8 percent of p-xylene and 5 to 8 percent of n-butyl alcohol. The composition can be prepared by uniformly stirring the components. The preparation method is simple, and the prepared two-phase absorbent can improve the saturated absorption capacity, improve the desorption rate and optimize the performance of the phase change absorbent.

The present application relates to the field of cosmetic technology, in particular to a quick-drying and shaping spray and a preparation method thereof, in particular to a hair styling product which is quickly dried, permanently shaped and has hair care effect through the synergistic effect of specific film-forming agents and volatile systems, comprising the following components: ethanol 30-50%, aminomethyl propanol 0.1-1%, butanediol 1-5%, octyl acrylamide / acrylate / methyl acrylate copolymer 5-15%, PEG-12 dimethicone 0.5-2%, keratin 0.1-2%, hydrolyzed keratin 0.1-2%, oxidized keratin 0.1-2%, aloe barbadensis leaf extract 0.5-3%, selaginella kurata extract 0.5-3%, radix falatoniae extract 0.5-3%, radix salviae miltiorrhizae extract 0.5-3%, water 20-40%, essence 0.1-2%, cetrimonium chloride 0.1-1%, phenoxyethanol 0.5-1.5%, propylene glycol 1-5%, p-hydroxyacetophenone 0.5-1.5%, chlorphenesin 0.1-0.5%, ethylhexylglycerin 0.5-1.5%.

The invention relates to a liquid detergent composition comprising a first surfactant selected from fatty alcohol ether sulfates, a second surfactant selected from betaines, optionally at least one solvent selected from ethanol, propanol, isopropanol, ethylene glycol, butyl glycol, propylene glycol, polypropylene glycol, alcoholamine, monoethanolamine, glycerol and mixtures thereof, wherein the salt concentration in the composition is about 0.2 to about 10 wt.-% and wherein the salt is selected from the group consisting of sodium salts such as sodium chloride, sodium sulfate, sodium formate, sodium acetate or sodium propionate, potassium salts such as potassium chloride, potassium sulfate, potassium formate, potassium acetate or potassium propionate, magnesium salts such as magnesium chloride, magnesium sulfate, magnesium formate, magnesium acetate or magnesium propionate, and calcium salts such as calcium chloride, calcium sulfate, calcium formate, calcium acetate or calcium propionate, and mixtures thereof, and wherein the composition is a concentrate that can be diluted with water while maintaining or increasing the viscosity.The present invention further relates to the use of such a cleaning composition for cleaning hard surfaces, in particular dishes, and to a process for preparing a cleaning composition, the process comprising diluting the concentrated liquid cleaning composition with water.

The invention relates to the technical field of chemical detection, in particular to a sample pretreatment method and a GC-MS (Gas Chromatography-Mass Spectrometer) method for simultaneously detecting glycidol and monochloropropanol in heated cigarette aerosol. The sample pretreatment method for simultaneously detecting the glycidol and the monochloropropanol in the heated cigarette aerosol comprises the following steps: capturing particulate matters in the heated cigarette aerosol; mixing the trapping material with ethyl acetate and an internal standard substance, extracting to obtain an extracting solution, and diluting with n-hexane; adding heptafluorobutyrylimidazole to perform derivatization reaction, washing with water after the derivatization reaction is completed, and drying to obtain a solution to be detected. According to the present invention, ethyl acetate is adopted for extraction, and detection analysis can be performed through dilution, HFBI derivatization, water washing and drying, such that the sample pretreatment step is substantially simplified, and the analysis sensitivity and the accuracy of the simultaneous detection of the three compounds such as the glycidyl, the 3-chloro-1, 2-propylene glycol and the 2-chloro-1, 2-propylene glycol can be easily improved.

The invention relates to the technical field of electroplating, in particular to a nickel stripping agent, a preparation method of the nickel stripping agent and a nickel plating layer stripping method. The nickel stripping agent comprises the following raw materials: an oxidizing agent, a complexing agent, a dissolution promoter, a surfactant and a corrosion inhibitor, wherein the mass ratio of the oxidizing agent to the complexing agent to the dissolution promoter to the surfactant to the corrosion inhibitor is (4-15): (3-25): (1-11): (0.01-1): (0.01-5); wherein the oxidizing agent is nitrobenzoic acid; the complexing agent is one or more of 2-amino-2-methyl-1-propyl alcohol, acetylacetone, nitrilotriacetic acid, nitrilotriacetic acid sodium salt, acrylate, sodium gluconate and ethylenediamine hydrochloride; the dissolution promoter is an alcohol ether solvent. According to the nickel stripping agent, the oxidizing agent with relatively low toxicity and a non-toxic or low-toxicity non-volatile complexing system are adopted, nickel can be completely removed, a base material cannot be eroded, and the threat to the health of operators can be remarkably reduced.

The invention belongs to the technical field of chemical component detection, and particularly relates to a method for detecting residues of 1, 3-dichloro-2-propanol, 2, 3-dichloro-1-propanol and 3-chloro-1, 2-propylene glycol in dihydroxypropyl theophylline. The detection method comprises the following steps: (1) adding a solvent into diprophylline for dilution, and uniformly shaking to prepare a test solution; (2) detecting the liquid to be detected by adopting a gas chromatography-tandem mass spectrometry method, and calculating the content of 1, 3-dichloro-2-propanol, the content of 2, 3-dichloro-1-propanol and the content of 3-chloro-1, 2-propylene glycol in the diprophylline according to an external standard method; the solvent is a mixture of formic acid and DMF (Dimethyl Formamide). The method provided by the invention is good in specificity, high in sensitivity, good in repeatability and high in accuracy, and can be used for simultaneously detecting 1, 3-dichloro-2-propanol, 2, 3-dichloro-1-propanol and 3-chloro-1, 2-propylene glycol in the diprophylline.

The invention relates to an anti-aging color master batch for a film and a preparation method of the anti-aging color master batch, and belongs to the technical field of polyester color master batches. The color master batch is prepared from the following components: 25 to 32 weight percent of pigment, 0.35 to 0.48 weight percent of modified anti-aging agent, 1.2 to 1.6 weight percent of dispersing agent, 0.1 to 0.12 weight percent of heat stabilizer, 2.8 to 3.6 weight percent of lubricating agent and the balance of PET (Polyethylene Terephthalate) resin, according to the modified anti-aging agent, 3-bromopropanol and tetramethyl piperidylamine are substituted to form an intermediate, then oxalyl chloride monoethyl ester and active alcoholic hydroxyl groups introduced into intermediate molecules are esterified to form a double-chain diester structure, the modified anti-aging agent has high compatibility with a PET matrix and is easy to disperse, the double-chain diester structure containing tertiary amine forms a chelation effect, and the modified anti-aging agent is chelated with a metal-based pigment during blending, so that the anti-aging effect is good. Interface free radicals are efficiently cleared in situ, interface aging is effectively retarded, and a long-acting anti-aging effect is formed.

The invention discloses a temperature-resistant and salt-resistant tackifier and a preparation method thereof, and relates to the technical field of fracturing fluids. The preparation method of the temperature-resistant and salt-resistant tackifier comprises the following steps: taking a first monomer and diethanol amine to carry out epoxy ring-opening reaction, and after the reaction is finished, separating and purifying to obtain an intermediate; taking the intermediate, adding a quaternization reagent for quaternization reaction, and then separating and purifying to obtain an active monomer; the first monomer is one of allyl alcohol glycidyl ether, acrylic acid glycidyl ether and methacrylic acid glycidyl ether, and the quaternization reagent is one of halogenated carboxylate or halogenated sulfonate; the preparation method comprises the following steps: dissolving acrylamide, an active monomer and unsaturated phosphate, and carrying out free radical polymerization under the action of an initiator. The tackifier provided by the invention has good temperature-resistant and salt-resistant effects, and can tolerate salt water with mineralization degree of 120,000 mg / L and high temperature of 150 DEG C.

The invention discloses a preparation method of gardenia blue pigment. The preparation method comprises the following steps: (1) precipitating and removing impurities by copper sulfate: precipitating and removing impurities from column liquid after gardenia yellow is extracted by copper sulfate to obtain supernate; (2) oxidizing and decoloring by potassium permanganate and removing excessive copper ions: performing neutral oxidation on the supernate by potassium permanganate to obtain decolored supernate; (3) nanofiltration concentration and spray drying: carrying out alkaline nanofiltration concentration and spray drying on the decolorized supernatant to obtain a geniposide solid crude product; (4) extracting geniposide with propyl alcohol and recrystallizing: extracting the crude product with ethyl acetate and recrystallizing to obtain a fine geniposide product; (5) ethyl acetate two-phase acid hydrolysis: carrying out ethyl acetate two-phase acid hydrolysis and recrystallization on the refined product to obtain a genipin pure product; and (6) preparing a gardenia blue pigment pure product: reacting the genipin pure product with sodium isoleucine to obtain the gardenia blue pigment. The method is simple and easy to implement, convenient to operate, outstanding in product characteristics, easy in equipment type selection and matching, low in equipment investment, high in product additional value, good in economic benefit and capable of being mechanized.

The invention discloses a preparation method of 1-chloro-2, 3, 3-trifluoropropene, which comprises the following steps: (1) an addition step: carrying out an addition process on chlorotrifluoroethylene and methanol under the action of a free radical initiator to obtain 2-chloro-2, 3, 3-trifluoropropanol; (2) a chlorination step: carrying out a chlorination reaction on the 2-chloro-2, 3, 3-trifluoropropanol under the combined action of a chlorination reagent and a catalyst to obtain 1, 2-dichloro-2, 3, 3-trifluoropropane; and (3) a dehydrochlorination step: carrying out gas phase dehydrochlorination on the 1, 2-dichloro-2, 3, 3-trifluoropropane to obtain the 1-chloro-2, 3, 3-trifluoropropene. The method has the advantages of easily available raw materials, mild reaction conditions, high purity, easiness in separation, suitability for industrial application and the like.

The invention discloses a copper-based catalyst for preparing propyl alcohol by electrocatalytic reduction of carbon dioxide and application of the copper-based catalyst. The preparation method of the copper-based catalyst comprises the following steps: adding a sodium hydroxide solution into an aqueous solution of a copper compound to obtain a turbid solution; adding a hydroxylamine hydrochloride aqueous solution into the turbid solution, carrying out a reaction, and carrying out centrifugal drying to obtain Cu (OH) 2 / CuO; cu (OH) 2 / CuO is prepared into a working electrode, and then the working electrode is reduced into the Cu / Cu2O nanosheet through an electrochemical reconstruction method. The Cu / Cu2O electrocatalyst with the bicontinuous nano-domain structure is obtained by using a two-step electrochemical reconstruction method, and the Cu / Cu2O electrocatalyst is used as a cathode for electrocatalytic reduction of carbon dioxide. The hydrogen evolution reaction is inhibited in a KOH or KHCO3 aqueous solution system, so that the activity of propyl alcohol preparation is remarkably improved. Experiments show that the Faraday efficiency of propyl alcohol exceeds 12.1% under the current density of 0.84 A cm <-2 >, and the Faraday efficiency of propyl alcohol is good. According to the analysis, the Cu / Cu2O catalyst obtained through the electrochemical reconstruction method serves as the cathode, and the propyl alcohol can be prepared through the carbon dioxide electrocatalytic reduction reaction.

This application provides a method for preparing compound I-b or a pharmaceutically acceptable salt thereof, wherein (S)-N-methylamino-1-(2-thiophene)-1-propanol reacts with 4-fluorobenzo[1,3]dioxolane in a system containing sodium hydride and potassium benzoate to obtain compound I-b. This method has short steps, mild reaction conditions, and is simple to operate, making it suitable for industrial scale-up; moreover, the obtained product has high purity and low isomer content.

The invention belongs to an allyl alcohol copolymer, and particularly relates to a method for preparing an allyl alcohol copolymer based on an intermediate conversion method, the allyl alcohol copolymer and application of the allyl alcohol copolymer. The method comprises the following steps: reacting allyl alcohol with a hydroxyl conversion reagent to convert hydroxyl into other groups so as to obtain a new allyl monomer; carrying out copolymerization on the monomer and other comonomers under the action of an initiator to obtain a copolymer; the hydroxyl is recovered by removing a conversion group, so that efficient and green preparation of the allyl alcohol copolymer is realized. The hydroxyl is converted into other groups, so that the reactivity rate of copolymerized monomers is closer during copolymerization, and the regulation and control of molecular weight and molecular composition are easy to realize; the high-temperature and high-pressure reaction conditions are avoided, and the safety risk caused by the fact that the highly toxic allyl alcohol raw material is greatly excessive is avoided; the polymerization reaction can be performed under normal pressure, the reaction condition is mild, and the equipment investment and maintenance cost are reduced; and the amount of residual allyl alcohol in the product is greatly reduced.

The invention discloses a phosphorus-nitrogen flame retardant and a flame-retardant polyvinyl alcohol composite material based on the phosphorus-nitrogen flame retardant, the phosphorus-nitrogen flame retardant is prepared by reacting phenyl phosphorus dichloride with 1, 3-diamino-2-propanol, and the flame retardance of the polyvinyl alcohol composite material can be remarkably improved by adding the phosphorus-nitrogen flame retardant into polyvinyl alcohol through a melt processing method. The phosphorus-nitrogen flame retardant synthesized by the invention combines the advantages of a phosphorus-based flame retardant and a nitrogen-based flame retardant, contains a large amount of hydroxyl groups, has good compatibility with polyvinyl alcohol, has stable properties at about 200 DEG C, is not acidic or alkaline, and can be suitable for the melting processing process of a polyvinyl alcohol film.

The invention belongs to the technical field of preparation of electronic-grade tartaric acid, and particularly relates to a method for preparing a high-purity electronic-grade tartaric acid solution by using a secondary recrystallization method, which comprises the following steps: (+)-tartaric acid with the purity of 99.7% L is reacted with metal ions 1t under the condition of 90 DEG C; preparing a tartaric acid solution from 1ppt of ultrapure water, cooling to 20 DEG C, crystallizing and separating out; the sample after the primary recrystallization is treated with a solvent 1 (metal ion lt respectively) under the condition of 60-90 DEG C; 0.1 ppb of electronic grade methanol / ethanol / propanol / isopropanol and metal ions lt; 1 ppt of ultrapure water) is prepared into a tartaric acid solution, and the tartaric acid solution is cooled to 0-20 DEG C for crystallization and precipitation; after secondary recrystallization, using a solvent 2 (metal ion lt; 0.1 ppb of electronic grade methanol / ethanol / propanol / isopropanol and metal ions lt; 1 ppt of ultrapure water) is prepared into a 2%-30% tartaric acid solution, and metal ions are removed through secondary electronic-grade strong-acid cation exchange resin. The method is simple in step and easy to operate, and the maximum removal rate of metal ions reaches 99.92%.

The invention relates to a high-selectivity amine-process absorbent and a preparation method thereof, and belongs to the technical field of industrial desulfurization. The absorbent comprises a main absorbent, an organic sulfur removal accelerant, an auxiliary agent and deionized water, the main absorbent comprises alcohol amine containing a tertiary amine structure and / or steric hindrance; the alcohol amine containing the tertiary amine structure and / or the steric hindrance comprises one or more of methyldiethanolamine, diisopropanolamine, 2-(tert-butylamino) ethanol, tert-butylamino ethoxyethanol and 2-amino-2-methyl-1-propanol. According to the method, CO2 absorption is inhibited through the steric hindrance amine, the regeneration energy consumption is reduced by 40%, and the technical problems that in the prior art, the CO2 co-absorption rate is high, and the regeneration energy consumption is large are solved.

The invention belongs to the technical field of daily chemicals, and particularly relates to high-temperature and neutral alkyl glycoside sulfonate as well as a preparation method and application thereof. The alkyl glucoside sulfonate provided by the invention is obtained by utilizing hydroxyl activity on a glucoside sugar unit to perform chemical modification, and specifically, 1, 3-dichloro-2-propanol is firstly adopted to perform intramolecular crosslinking on alkyl glucoside, and then 3-chloro-2-hydroxy sodium propanesulfonate is adopted to perform anionic modification. The prepared alkyl glycoside sulfonate has the advantages of being mild, low in irritation, high in hard water resistance, good in foaming performance, low in permeation amount on skin and small in residual amount, and can effectively overcome the defects that alkyl glucoside is high in permeability, high in deproteinization and degreasing capacity, large in damage to skin barriers, weak in thickening effect and the like in personal cleaning products; the method is very suitable for being widely used and popularized in daily chemicals.

The invention belongs to the field of edible oil processing. Specifically, the invention provides a grease deodorization method, the method comprises the step of deodorizing decolored oil to be deodorized, and the oil to be deodorized contains circulating decolored oil which is decolored at least twice. By controlling the content of DG in the raw materials and the addition amount and deodorization temperature of circulating decolorized oil in the deodorization step, the content of 3-chloropropanol ester in the prepared grease can be reduced, the color of the grease is reduced, and meanwhile the frying frequency of the grease is prolonged.

The invention belongs to the technical field of raw material preparation, and particularly relates to a production method for co-production of isopropanolamine and DL-2-aminopropanol. The production method for co-production of isopropanolamine and DL-2-aminopropanol comprises the following steps: adding ammonium carbonate, ammonium carbamate, epoxypropane and water into a high-pressure reaction kettle, uniformly stirring, heating to 88-90 DEG C, preserving heat for 30-35 minutes under 0.8 MPa, then heating to 100-103 DEG C, reacting for 40-45 minutes under 1.0 MPa, cooling to room temperature, filtering, washing, and drying to obtain the DL-2-aminopropanol. And after the reaction is finished, carrying out post-treatment to obtain a mixture of isopropanolamine and DL-2-aminopropanol. According to the production method for co-production of isopropanolamine and DL-2-aminopropanol, the process is simple, parameters are easy to control, reaction conditions are relatively mild, it is guaranteed that a large amount of monoisopropanolamine and DL-2-aminopropanol are generated, and meanwhile generation of by-products diisopropanolamine and triisopropanolamine is reduced.

The invention relates to ultralow-temperature concrete which comprises the following components: cement, fly ash, machine-made sand, gravel, an anti-freezing agent and water, wherein the anti-freezing agent is prepared from a water reducing agent, sodium sulfate, sodium alkyl benzene sulfonate, meronitrotripropanol, 6-caprolactone and p-toluenesulfonic acid; the invention further relates to a manufacturing process of the ultralow-temperature concrete. The machine-made sand and the broken stone which are well graded are adopted, the small void ratio can be obtained, and the water consumption and the cement consumption can be reduced; under the catalysis of p-toluenesulfonic acid, 6-caprolactone is subjected to ring opening, and a modified polyol mixture generated through the reaction of meronitrotripropanol and 6-caprolactone can be adsorbed on the surface of an ice crystal, so that the expansion of the ice crystal is inhibited, and the freezing point is effectively reduced; the sodium sulfate accelerates the hydration process of the cement to achieve the purpose of early strength, the water reducing agent is used for reducing water consumption and reducing expansion caused by water freezing, and the sodium alkyl benzene sulfonate serving as an air entraining agent can improve the performance of the concrete and ensure normal hardening of the concrete at the ambient temperature of-20 DEG C.