31 results about "Tetrachloropropylene" patented technology

The invention discloses a preparation method for 3,3,3-trifluoropropene, and the preparation method comprises the following steps of: (1) taking carbon tetrachloride and ethylene as a raw material and organic peroxides as a catalyst, and reacting to prepare 1,1,1,3-tetrachloropropane, wherein the molar ratio of carbon tetrachloride and ethylene is (1:1)-(30:1), the reaction pressure is 0.3-1.5MPa, the reaction temperature is 50-150DEG C, and the reaction time is 2-5 hours; (2) taking the prepared 1,1,1,3-tetrachloropropane and anhydrous hydrogen fluoride as a raw material, and preparing 1,1,1-trifluoro-3-chloropropane in a reactor under the action of the catalyst and a polymerization inhibitor, wherein the molar ratio of 1,1,1,3-tetrachloropropane and anhydrous hydrogen fluoride is (1:3)-(1:50), the reaction pressure is 0.2-0.7MPa, the reaction temperature is 40-70DEG C, and the reaction time is 6-8 hours; and (3) carrying out dehydrochlorination on the prepared 1,1,1-trifluoro-3-chloropropane so as to prepare 3,3,3-trifluoropropene.

Processes for the production of chlorinated propanes are provided. The processes comprise catalyzing the chlorination of 1,1,1,3-tetrachloropropane with aluminum chloride, either alone or in combination with ferric chloride. Low intensity conditions are appropriate for the process, e.g., temperatures of from ambient to 100°C and pressures of from ambient to 200 psig may be used. Even though low intensity conditions are used, the aluminum chloride provides at least 1.5 times greater the conversion rate and / or productivity of 1,1,1,3-tetrachloropropane as compared to ferric chloride when used as a single catalyst under similar processing conditions.

The invention discloses a preparation method of 1,1,1,3-tetrachloropropane. Carbon tetrachloride and an auxiliary agent are mixed, preheated and forced to circulate for a period of time, and then reacted with ethylene in an intensified reactor for forced circulation. The crude product of 1,1,1,3-tetrachloropropane was obtained, which was finally separated by vacuum distillation to obtain 1,1,1,3-tetrachloropropane. The method for preparing 1,1,1,3-tetrachloropropane provided by the present invention has simple process, low energy consumption, and easy control of the reaction process. 75% to 95% of the residual liquid in the second rectification column can be recycled, with high material utilization rate, less waste generation, and high purity of the target product. At the same time, the use of ammonia-nitrogen-free and phosphorus-free catalysts solves the problem of nitrogen and phosphorus. The pollution of the three wastes is highly efficient and environmentally friendly.

The invention discloses a method for producing 1,1,3-trichloropropene by liquid-phase homogeneous catalyzed dehydrochlorination of 1,1,1,3-tetrachloropropane. In a tank reactor, 1,1,1,3-tetrachloropropane is heated and dehydrochlorinated to produce 1,1,3-trichloropropene, and after the reaction, an extractant is added to recover the catalyst iron p-toluenesulfonate. The catalyst of the invention has good activity, high selectivity, easy separation and reuse, and is environmentally friendly. After the reaction is completed, the catalyst is extracted and recovered by using a solvent, reducing waste solid discharge, and the activity of the recovered catalyst remains unchanged.

The invention discloses a method for synthesizing 2,3,3,3-tetrafluoropropene and belongs to the field of organic synthesis. The method comprises the following steps: (1) preparing 2-chloropropene from 1,2-dichloropropane, which serves as a raw material, through continuous catalytic cracking by adopting a fixed bed in the presence of beta-zeolite, which serves as a catalyst; (2) selectively chlorinating 2-chloropropene with chlorine gas under the catalysis of ferric chloride, so as to prepare 2,3,3,3-tetrachloropropylene; and (3) fluorating 2,3,3,3-tetrachloropropylene with hydrofluoric acid under the catalysis of SbF3 or SbF5, thereby obtaining 2,3,3,3-tetrafluoropropene. The synthesis route has the advantages that the source of raw materials is wide, the cost is low, and the product yield is high; and the obtained product can serve as an automotive air conditioning refrigerant and has a positive significance in reduction of greenhouse effect.

The invention discloses a preparation method of 3,3,3-trifluoropropene, (1) uniformly mixing 1,3,3,3-tetrachloropropane and an inhibitor at a molar ratio of 1:5-50; (2 ) Send the mixture to the first vaporizer for vaporization, the vaporization temperature is 80°C-300°C; (3) Pass hydrogen fluoride into the second vaporizer for vaporization, the vaporization temperature is 80°C-300°C; (4) After the steps ( The product of 2) and the product of step (3) are simultaneously fed into a gas phase reactor equipped with a catalyst for reaction, the total molar ratio of 1,3,3,3-tetrachloropropane and inhibitor to hydrogen fluoride is 1:1, Reaction temperature 200℃~600℃, reaction space velocity 2000h ‑1 ~4000h ‑1 , the reaction pressure is 0.2Mpa-1.0Mpa; (5) Purifying the product in step (4) to obtain 3,3,3-trifluoropropene. The invention improves the service life of the catalyst, reduces impurities produced in the preparation process, and improves the conversion rate of 1,3,3,3-tetrachloropropane and the yield of 3,3,3-trifluoropropene.

The invention discloses a gas-phase preparation method of 1,1,2,3-tetrachloropropene. Under the action of a catalyst, 1,1,1,2,3-pentachloropropane undergoes a gas-phase catalytic dehydrochlorination reaction, and the reaction The temperature is 150-250° C., the contact time is 1-15 seconds, and the reaction product is collected and rectified under reduced pressure to obtain 1,1,2,3-tetrachloropropene product. The invention has the advantages of simple process, good catalyst activity, long service life, environmental protection and easy industrialization.

The invention relates to a method for synthesizing cis / trans-3,3,3-trifluoro-1-chloropropylene and belongs to the technical field of organic synthesis. The method comprises the following steps: (1) selectively chlorinating 1,3-dichloropropylene by chlorine gas in the presence of a catalyst, i.e., ferric chloride, so as to synthesize 1,3,3,3-tetrachloropropylene; and (2) fluorating 1,3,3,3-tetrachloropropylene by hydrogen fluoride in the presence of a catalyst, i.e., antimony pentafluoride, thereby synthesizing cis / trans-3,3,3-trifluoro-1-chloropropylene. The product cis / trans-3,3,3-trifluoro-1-chloropropylene can be used as a polyurethane foaming agent, and trans-3,3,3-trifluoro-1-chloropropylene can be used for replacing HCFC, HFC and alkane foaming agents, is an ideal environment-friendly polyurethane foaming agent and can be prepared from cis isomers through ionic liquid catalysis or ultraviolet illumination isomerization.

The invention provides a preparation method of 1,1,1,2,3-pentachloropropane, the method uses 1,1,1,3-tetrachloropropane as raw material, 1,1,1,2,3- Pentachloropropane is used as a solvent, and dehydrochlorination reaction is carried out to obtain 1,1,3-trichloropropene, chlorine gas is introduced into the reaction system after the reaction, and chlorination reaction is carried out to obtain 1,1,1,2,3-pentachloropropane , in the present invention, 1,1,1,2,3-pentachloropropane is used as a solvent or diluent, and can be used as a solvent to prevent high boilers such as dimers, oligomers or polymers from being produced in the process of dehydrochlorination The inhibitor can increase the conversion rate of 1,1,1,3-tetrachloropropane and the yield of the final product 1,1,1,2,3-pentachloropropane. The preparation method of the invention can be used in the production mode of batch reaction, and can also be used in the production mode of continuous reaction, is suitable for industrial production, and has wide application prospects.