11 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.

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 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.

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.