12 results about "Dichloroprop" patented technology

The invention relates to a method for resource utilization of 1, 1, 2-trichloropropane, and the method comprises the following steps: (1) carrying out high-temperature cracking on a material flow containing 1, 1, 2-trichloropropane to obtain a material flow containing 3, 3-dichloropropene; and (2) carrying out chlorination on the material flow containing 3, 3-dichloropropene to obtain a material flow containing 1, 1, 2, 3-tetrachloropropane. According to the method disclosed by the invention, the propylene chlorination by-product 1, 1, 2-trichloropropane can be subjected to high-temperature cracking to obtain 3, 3-dichloropropene, and 1, 1, 2, 3-tetrachloropropane is obtained after the 3, 3-dichloropropene is chlorinated. The byproduct 1, 1, 2-trichloropropane is fundamentally solved, the process route is simple, the flow is short, the reaction conversion rate is high, the selectivity is good, and industrial implementation is facilitated.

This utility model relates to the field of chemical product refining technology, and provides a refining apparatus for trans-1,3-dichloropropylene. The apparatus includes a distillation column body with an anti-clogging mechanism inside, and a pretreatment mechanism at the bottom. The distillation column body includes a jacketed heater, with a reboiler fixedly connected to its bottom. The jacketed heater is fitted onto the upper end of the reboiler, with an oil inlet pipe fixedly connected to its input end and a return oil pipe fixedly connected to its output end. The anti-clogging mechanism includes an insulation pipe, a ring pipe, and a sieve. This technical solution solves the problems in the prior art where high-boiling-point substances adhere to the inner wall of the reboiler and the surface of the guide plates, leading to decreased heat transfer efficiency and increased heating energy consumption to maintain the reboiler temperature; and also causes clogging of the reboiler discharge port and reboiler heat exchange tubes.

This invention belongs to the field of organic synthesis technology and discloses a method for preparing trans-3-chloro-2-propenylhydroxylamine hydrochloride. The method involves adding trans-1,3-dichloropropene to a ketoxime, a base, a phase transfer catalyst, and a first solvent for etherification. After the reaction, the mixture is first extracted with an extractant, and the resulting oil phase is then distilled to obtain the oxime ether. The oxime ether, an aqueous hydrochloric acid solution, and a second solvent are mixed and subjected to vacuum distillation in a distillation column to obtain trans-3-chloro-2-propenylhydroxylamine hydrochloride. This invention avoids the use of an aqueous base in the etherification stage, effectively preventing the hydrolysis of the ketoxime. The purified oxime ether obtained in the etherification step is purified by distillation, significantly reducing side reactions during the subsequent hydrolysis. Adding a solvent during the hydrolysis stage allows for better mixing of the aqueous hydrochloric acid solution and the oxime ether, resulting in more uniform acidification, a more complete reaction, and improved conversion and selectivity.

The invention relates to the technical field of synthesis, and provides a method for efficiently and continuously synthesizing 1-isothiocyanate-2-chloro-2-propylene, which comprises the following steps: S1, reacting 2, 3-dichloropropene and a thiocyanate compound in a first-stage reaction kettle to obtain a reaction solution; s2, upwards discharging a water phase of the reaction liquid out of the first-stage reaction kettle, enabling an oil phase of the reaction liquid and undissolved sodium chloride solid to run downwards until the oil phase separated by an oil-solid separator enters a second-stage reaction kettle, and discharging the sodium chloride solid out of the system; s3, carrying out rearrangement reaction on the oil phase in a secondary reaction kettle to obtain a mixed solution; and S4, cooling the mixed solution, adding water, mixing, standing for layering to form a first oil phase and a first water phase, and carrying out reduced pressure rectification on the first oil phase to obtain the 1-isothiocyanate-2-chloro-2-propylene. According to the technical scheme, the problems of tedious reaction steps and low production efficiency of the 1-isothiocyanate-2-chloro-2-propylene in the prior art are solved.

The utility model discloses a liquid sorting detection control device in dichloroacrylonitrile production. The liquid sorting detection control device comprises a reaction kettle, a main discharge pipe is arranged at a discharge port at the bottom of the reaction kettle, a main valve is arranged on a pipe section of the main discharge pipe, an observation sight glass is arranged at the lower end of the main discharge pipe, and a detection sensor is mounted on the main discharge pipe and on the opposite side of the observation sight glass; the detection sensor comprises a light supplementing light source and a color and brightness detection device, the detection sensor is connected with the control part through a signal line, and the control part comprises a PLC and a touch screen. According to the utility model, dichloro acrylonitrile and liquid impurities can be effectively layered in the reaction kettle, and dichloro acrylonitrile and impurities can be automatically detected.

The invention discloses a preparation method of 3, 3, 3-trifluoro-1-propyne, and the preparation method comprises the following steps: S1, in the presence of a solvent, reacting 3, 3, 3-trifluoro-1, 1-dichloro-1-propylene or 3, 3, 3-trifluoro-1, 1-dibromo-1-propylene with a strong base to prepare a 3, 3, 3-trifluoro-1-propyne strong base salt; s2, enabling the 3, 3, 3-trifluoro-1-propyne strong alkali salt to react with water, so as to prepare the 3, 3, 3-trifluoro-1-propyne. The preparation method of the 3, 3, 3-trifluoro-1-propyne, disclosed by the invention, has the advantages of easily available raw materials, simple process, no need of using a catalyst, recyclable solvent, small amount of three wastes, high product yield and suitability for industrial application.

The invention discloses a herbicide stabilizer and a preparation process thereof. The invention relates to a water-retaining agent, which is prepared from the following raw materials in percentage by mass: 20 to 25 percent of dichloropropene amine, 10 to 15 percent of beta-cyclodextrin-chitosan graft, 12 to 18 percent of sodium lignin sulfonate modified bentonite, 3 to 6 percent of alpha-tocopherol succinate, 4 to 8 percent of nano titanium dioxide coated UV-P, 1 to 3 percent of ethylene diamine tetraacetic acid, 2 to 5 percent of polyaspartic acid, 1 to 4 percent of sodium glycerophosphate and 8 to 11 percent of polyoxyethylene polyoxypropylene ether block copolymer. And the balance of modified white carbon black. The invention relates to the technical field of pesticides. According to the present invention, the dichloropropene amine is subjected to double anchoring, and the ultrasonic microwave synergistic inclusion process is combined to enhance the binding force of the dichloropropene amine and the carrier, such that the oxidation, the photolysis and the metal ion catalytic decomposition path of the dichloropropene amine are inhibited so as to further reduce the dichloropropene amine degradation rate, and the adaptation range of the dichloropropene amine can be improved; the function attenuation rate is also reduced, and the problem of insufficient dosage form compatibility caused by strong hydrophobicity of dichloropropene amine is effectively solved.

The invention discloses a synthetic method of dichloropropenylamine. The invention relates to the technical field of dichloroallylamine, which comprises the following steps: step 1, slowly dropwise adding liquid caustic soda with the mass fraction of 30-35% into 86-90g of cyanamide under the condition of normal temperature, controlling the system temperature to be not higher than 30 DEG C in the dropwise adding process, keeping the temperature for 30-40 minutes after dropwise adding, then adding 228-236g of allyl chloride and a composite solvent, reacting for 2-2.5 hours at the stirring speed of 250-300r / min, and after the reaction is finished, cooling to room temperature to obtain a reaction liquid; and distilling to recover the solvent, extracting and distilling under reduced pressure to obtain the diallyl cyanamide. According to the synthetic method of dichloropropenylamine and the preparation stage of diallyl cyanamide, a composite solvent is adopted, so that the solubility of raw materials is improved, the mass transfer efficiency is enhanced, gradient heating solvent recovery is combined, the solvent recovery rate is effectively improved, and meanwhile, the yield of diallyl cyanamide is stabilized at 93-95%; the 5% sodium chloride aqueous solution is added as a layering aid to destroy an emulsion layer, so that the layering time is shortened, and the efficiency is remarkably improved.

The invention relates to the technical field of synthesis of 1-isothiocyanic acid-2-chloro-2-propylene, and provides a preparation method of the 1-isothiocyanic acid-2-chloro-2-propylene. The invention relates to a preparation method of 1-isothiocyanate-2-chloro-2-propylene, which comprises the following steps: S1, blending a thiocyanate aqueous solution and 2, 3-dichloropropene in a primary reactor, and carrying out primary reaction and separation to obtain an oil phase and a salt water phase; s2, carrying out secondary reaction on the oil phase in a secondary reactor to obtain a reaction solution; s3, carrying out refining treatment on the reaction liquid, so as to obtain 1-isothiocyanate-2-chloro-2-propylene; during the primary reaction, the temperature is 80-90 DEG C, and the reaction time is 10-20 minutes; and during the secondary reaction, the temperature is 100-105 DEG C, and the reaction time is 1.5-4 hours. According to the technical scheme, the problems of low yield, low purity and low production efficiency during production of the 1-isothiocyanate-2-chloro-2-propylene in the prior art are solved.

This disclosure relates to the technical field of waste heat recovery. One embodiment of this disclosure provides a waste heat recovery device for dichloropropylene production, comprising: a base plate, a foundation, and a shell. The foundation is vertically fixed to the base plate, and the shell is disposed on the foundation. A fixing assembly is disposed between the shell and the foundation. Flow chambers are all opened within the side surface of the foundation and are distributed in multiple rows. Heat exchange components are disposed on the foundation and the shell, and the heat exchange components include a main inlet pipe and a main outlet pipe, which are respectively disposed at the top and bottom of the foundation. Both the main inlet pipe and the main outlet pipe are connected to the flow chambers, and several solenoid valves are installed on both the main inlet pipe and the main outlet pipe. This technical solution solves the technical problem of inconvenient disassembly and maintenance of existing heat exchangers in practical applications.