20 results about "Dichloropropane" patented technology

The invention discloses a method for simultaneously detecting the purity and impurities of 3-chloro-1-propanol, and relates to the technical field of chemical analysis, the method comprises the following steps: the impurities comprise 1, 3-dichloropropane, 1, 7-dichloro-4-oxaheptane and 3-(3-chloropropoxy) propan-1-ol, and the method comprises the following steps: S1, preparing a test solution; s2, preparing a reference substance solution; s3, gas chromatography determination: respectively carrying out gas chromatography detection on the reference substance solution prepared in the step S2 and the test solution prepared in the step S1, and recording chromatograms; s4, calculating the contents of 1, 3-dichloropropane, 1, 7-dichloro-4-oxaheptane and 3-(3-chloropropoxy) propyl-1-alcohol in the test sample by adopting an external standard method according to the peak area and concentration of each substance in the reference substance solution and the peak area of the corresponding substance in the test sample solution; the purity of the 3-chloro-1-propanol is calculated by adopting an area normalization method, so that the problem that the purity and impurities of the 3-chloro-1-propanol cannot be detected at the same time in the prior art is solved.

The application discloses a preparation method of 1,3-propanedisulfonic acid, which uses sodium sulfite and 1,3-dichloropropane as starting materials, and synthesizes sodium propanedisulfonate through sulfonation, and then concentrates, acidifies, separates sodium chloride, secondarily concentrates, evaporates and dehydrates, so as to obtain 1,3-propanedisulfonic acid with a purity of greater than or equal to 95.0%. The method is stable in process, high in yield (greater than or equal to 60.0%), and suitable for industrial production, and the raw materials are easy to obtain, so that the problems of low yield and low purity in the prior art are solved.

The invention discloses a novel refrigerant and a preparation method thereof, and an underground phase change temperature adjusting device, method and equipment, and relates to the technical field of underground operation, the novel refrigerant containing trichloroethane and dichloropropane provided by the invention is in a liquid state at normal temperature and normal pressure, the boiling point temperature can be about 70-110 DEG C according to different component contents at the normal pressure, and the temperature of the refrigerant can be about 70-110 DEG C according to different component contents. The critical temperature of the novel refrigerant can reach about 130-300 DEG C according to different component contents under pressurization, so that the novel refrigerant provided by the invention can be subjected to phase change in a high-temperature environment, the novel refrigerant can be applied to underground phase change temperature adjusting devices and equipment for high-temperature operation, heat can be absorbed by utilizing heat absorption phase change to realize cooling, and the service life of the novel refrigerant is prolonged. The heat release phase change can release heat to achieve temperature rise, so that heat transfer and temperature control are achieved, the temperature control device can be suitable for controlling the temperature of the working environment of underground instruments and equipment, and the instruments and equipment can normally, stably and reliably work underground.

The application discloses a 3-chloropropylene device by-product 1,2-dichloropropane refining device and method, in particular, the 3-chloropropylene device by-product 1,2-dichloropropane purity reaches >=99.9% by using the extraction rectification technology, residual dichloropropylene is <100ppm, the economic value of the product is improved, the extraction rectification technology plays the role of energy saving and consumption reduction, and has wide industrialization application prospect.

The application provides a preparation method of high-quality 2,2-bis(3-amino-4-hydroxyphenyl)propane, which comprises the following steps: uniformly stirring o-aminophenol, 2,2-dichloropropane and a catalyst, increasing the temperature, and performing heat preservation reaction; after the reaction is completed, the temperature is reduced, white solids are precipitated, filtration is performed, a filtrate and solids are obtained, and the solids are washed, filtered and vacuum-dried to obtain 2,2-bis(3-amino-4-hydroxyphenyl)propane. The preparation method adopts a new process system, raw materials and a catalyst are low in price, environment-friendly, safe in operation, and high in product quality, and is suitable for large-scale production.

The invention provides a method for co-producing HFO-1234yf and HFO-1234ze. The method comprises the following steps: (1) reacting dichloroethylene with trifluoromethane under the action of a first catalyst to prepare trifluorodichloropropane; (2) carrying out gas-phase dehydrochlorination reaction on the trifluorodichloropropane under the action of a second catalyst to generate trifluorochloropropene; and (3) the trifluorochloropropene and anhydrous hydrogen fluoride are subjected to a gas phase fluorination reaction under the action of a third catalyst, and HFO-1234yf and HFO-1234ze are generated. By optimizing a reaction path and a catalyst system, efficient co-production of HFO-1234yf and HFO-1234ze is realized, and the method has the advantages of mild reaction conditions, high product selectivity and the like, and is suitable for industrial production.

A device and method for refining 1,2-dichloropropane, a by-product of a 3-chloropropene unit, by combining distillation, polymerization, and adsorption. The present invention discloses a device and method for refining 1,2-dichloropropane, a by-product of a 3-chloropropene unit. The device utilizes a combination of a light removal tower, a polymerization reactor, a heavy removal tower, and an adsorption tower to convert difficult-to-separate dichloropropene impurities into a polydichloropropene polymer through a polymerization reaction. Since the polymer has a large boiling point difference from dichloropropane, it is easy to separate and purify, thereby successfully achieving the refining and purification of 1,2-dichloropropane. The final 1,2-dichloropropane purity is ≥99.9%, and the residual dichloropropene content is <100 ppm. At the same time, the dichloropropene polymerization process conditions are mild, the equipment requirements are low, the process is simple, and it is conducive to expanding production.

The application discloses a refining device and method for 1,2-dichloropropane by-produced in a 3-chloropropylene device. The device combines a light-removing tower, a chlorination reaction kettle, a heavy-removing tower and an adsorption tower, so that dichloropropylene compounds which are difficult to separate from 1,2-dichloropropane react with chlorine to form saturated chloro-compounds heavy components which are easy to separate from 1,2-dichloropropane, thereby purifying 1,2-dichloropropane, and the purity of 1,2-dichloropropane by-produced in the 3-chloropropylene device is greater than or equal to 99.9%, and the residual dichloropropylene is less than 100 ppm, the economic value of the product is improved, the energy-saving and consumption-reducing effect of the extractive distillation technology is achieved, and the device has a wide industrial application prospect.

The invention discloses a preparation method of a PBA nanoparticle in-situ modified halloysite nanotube-polyethyleneimine cross-linked composite aerogel, comprising the steps of: modifying halloysite nanotubes with an epoxysilane coupling agent to obtain epoxylated HNTs, further grafting ethylenediamine on the surface of the halloysite nanotubes to obtain amino- and hydroxyl-rich HNTs; stirring and dissolving K4Fe(CN)6·3H2O and polyvinylpyrrolidone in a hydrogen chloride solution, then adding the amino- and hydroxyl-rich HNTs, ultrasonically dispersing them uniformly, and reacting to obtain PBA@HNTs; using 1,3-dichloropropane as a cross-linking agent, adding an acid-binding agent, and cross-linking the polyethyleneimine with the PBA@HNTs; finally, freeze-drying the reaction solution, then removing the residual acid-binding agent and its salts by soaking and washing, and drying again to obtain the finished aerogel. The invention solves the problems of polyethyleneimine easily remaining in the solution and the difficulty of recovering and reusing nanopowder materials, and improves the adsorption performance for heavy metal ions.

The application belongs to the technical field of noble metal separation, and particularly relates to a high-ionic-density polyionic liquid adsorbent and a method for recovering platinum (IV). The application first synthesizes a double triethylene diamine ionic liquid monomer containing four high-activity nitrogen positive ions through a quaternary ammonium reaction of triethylene diamine with 1,3-dichloropropane and 4-chloromethylstyrene. Then, the high-ionic-density polyionic liquid is further synthesized as a platinum (IV) adsorbent through a free radical polymerization reaction. The application has simple preparation process and low raw material cost. The obtained adsorbent has high ionic density and good swelling performance, can efficiently and quickly recover platinum (IV) in a solution, and exhibits excellent adsorption effect.

The present invention relates to a method for preparing dichloropropane by low-temperature catalysis. The method comprises the steps of preparing allyl alcohol by reacting allyl chloride, a polymerization inhibitor, and a catalyst. The method can achieve highly selective conversion of allyl chloride to dichloropropane, and the concentration of the dichloropropane produced by the photocatalytic reaction is as high as over 80% by weight. The method generates little wastewater when used to produce epichlorohydrin, thus being environmentally friendly.

The invention belongs to the technical field of waterborne polyurethane, and particularly relates to a tetrahydroxy gemini quaternary ammonium salt cationic waterborne polyurethane emulsion and a preparation method thereof. Aiming at the problems that waterborne polyurethane is invaded by bacteria, the emulsion stability is poor, the mechanical property of a membrane is poor and the like, N-methyldiethanolamine and 1, 3-dichloropropane are used for synthesizing gemini quaternary ammonium salt containing 2N < + > / 4-OH as a hydrophilic chain extender, and the gemini quaternary ammonium salt is used for synthesizing the waterborne polyurethane. The waterborne polyurethane emulsion with small particle size and good dispersion stability and the waterborne polyurethane film with good mechanical property can be obtained.

The invention relates to a synthesis method of a 1, 6-dicarbonyl compound, which takes N-aryl-N-(arylsulfonyl) acrylamide and cyclopropanol as raw materials, takes potassium persulfate or sodium persulfate or ammonium persulfate as an oxidant, and adopts one of the following solvents: a first solvent: 1, 2-dichloroethane and water in a volume ratio of (4: 1)-(1: 4); the second solvent comprises 1, 3-dichloropropane and water, and the volume ratio of the 1, 3-dichloropropane to the water is (4: 1)-(1: 4); the third solvent comprises chlorobenzene and water, wherein the volume ratio of chlorobenzene to water is (4: 1)-(1: 4); the 1, 6-dicarbonyl compound as shown in the formula C is obtained by reacting the raw materials in the presence of argon or nitrogen at 70-120 DEG C for 12-24 hours, and a noble metal catalyst and a reagent are not required to be used.

A process for making a compound of Compound 1 having the following structure: or a salt thereof, said method comprising contacting 2-fluorobenzoic acid (compound 1) with an iron catalyst and a phosphine ligand in the presence of a methylaluminum reagent and 1,2-dichloropropane.

According to the technical scheme, a chlorine injector is connected with a propylene injector through a connecting pipe, a chlorine connector is arranged on the upper side of a chlorine injector main body, a first injection nozzle is arranged in an inner cavity in the right side of the chlorine injector main body, and a first injection diffusion cavity is formed in an inner cavity in the left side of the chlorine injector main body; the left end is connected with the first mixer body; a propylene connector is arranged on the upper side of the propylene ejector, a second ejection nozzle is arranged in a right inner cavity, a second ejection diffusion cavity is formed in a left inner cavity, and the left end of the propylene ejector body is connected with a second mixer body. The device disclosed by the utility model has the beneficial effects that chlorine is firstly mixed and reacted with process water of the chlorine ejector, and a generated hypochlorous acid solution enters the propylene ejector; the gas-phase propylene and the hypochlorous acid solution are subjected to mixed reaction, so that direct contact between chlorine and propylene is avoided, the generation of dichloropropane is reduced, the side reaction of a chlorohydrination system is reduced, the utilization rate of propylene can be effectively improved, and the production cost is reduced.

The invention relates to a method for separating and recycling a dichloropropanol hydrochloric acid solution, which comprises the following steps: carrying out positive pressure desorption on the dichloropropanol hydrochloric acid solution to obtain recovered hydrogen chloride and a desorbed material; performing high-temperature layering on the analyzed material to obtain an oil layer and a water layer; mixing the oil layer with glycerol, and then separating to obtain a cyclization reaction raw material and a chlorination reaction raw material; carrying out negative pressure concentration on the water layer to obtain a cyclization reaction raw material and a concentrated material; and carrying out cyclization reaction on the cyclization reaction raw material to obtain the epoxy chloropropane. The method provided by the invention can effectively separate and recover all components of dichloropropanol, hydrogen chloride and water in the dichloropropanol hydrochloric acid solution, is low in treatment energy consumption, and meets the requirements of green and energy-saving production.

The invention provides a chemical milling protection adhesive. The chemical milling protection adhesive comprises a polymer resin material and methylcyclohexane or dichloropropane. The chemical milling protective glue can be widely applied to local chemical milling of aluminum plates for aerospace, has the characteristics of high milling precision, difficulty in corrosion leakage, easiness in glue tearing, low toxicity and the like, and fills the market blank of domestic like products. The protective glue is a perfect substitute material for traditional conventional imported chemical milling protective glue.

The invention belongs to the technical field of compounds, and discloses a preparation method of 3-[3-(cholamidopropyl) dimethylamino] propanesulfonic acid inner salt, which comprises the following steps: S1, carrying out reflux reaction on cholic acid and p-toluenesulfonic acid in a methanol solvent, cooling, crystallizing, filtering, and drying to obtain a product I; s2, heating the product I, N, N-dimethyl-1, 3-diaminopropane and p-toluenesulfonic acid to react for a certain time, evaporating to be thick after the reaction, adding water to crystallize, filtering, and drying to obtain cholamide; s3, carrying out reflux reaction on cholanamide and 1, 3-dichloropropane in ethanol, and carrying out reduced pressure distillation until the product is thick, so as to obtain a product III; and S4, adding water, sodium sulfite and copper chloride into the product III, carrying out reflux reaction for a certain time, carrying out desalting treatment, then carrying out evaporative crystallization, filtering and drying to obtain the 3-[3-(cholamidopropyl) dimethylamino] propanesulfonic acid inner salt. The method disclosed by the invention has the beneficial effects that only water and ethanol are used as solvents, so that the use of DMF (Dimethyl Formamide) is avoided.