39 results about "Tetrachloropropylene" patented technology

The invention relates to a method for continuously producing 1, 1, 1, 3-tetrachloropropane, which comprises the following steps: adopting a loop reactor in which a beam pipe is arranged in the reactor, mixing reaction raw materials ethylene and carbon tetrachloride at a Venturi nozzle at the lower part of the reactor through a gas circulation loop and a liquid circulation loop outside the reactor, and spraying into the reactor filled with a main catalyst. A cocatalyst and a chelating agent are added into a carbon tetrachloride raw material in advance, are pumped into a liquid loop by a feeding pump and then enter a reactor. Reaction raw materials are circularly stirred under the action of a beam pipe in the reactor, so that solid, liquid and gas phases are fully mixed. By adopting the method disclosed by the invention, the selectivity and the production efficiency of the 1, 1, 1, 3-tetrachloropropane can be greatly improved, and the method also has the advantages of simplicity in operation, environment friendliness, long service life of the catalyst and low cost.

Disclosed in the present invention is a method for co-producing 3,3,3-trifluoropropene and 2,3,3,3-tetrafluoropropene. The method comprises: introducing 1,1,1,3-tetrachloropropane, 1,1,1,2,3-pentachloropropane, and hydrogen fluoride into a first reactor, and reacting under the action of a first catalyst to obtain a first reactor reaction product; performing rectification on the first reactor reaction product to obtain a 3,3,3-trifluoropropene product and a tower kettle product, mixing the tower kettle product with hydrogen fluoride, and then introducing the mixture into a second reactor, and reacting under the action of a second catalyst to obtain a second reactor reaction product; and separating the second reactor reaction product from hydrogen chloride, water washing, alkaline washing, and drying to obtain a 2,3,3,3-tetrafluoropropene product. The present invention has the advantages of simple process, high efficiency, flexible operation, low investment, and low energy consumption.

The invention belongs to the technical field of catalyst preparation, and particularly relates to a catalyst special for tetrachloropropane dehydrochlorination and a preparation method and application thereof. The preparation method of the catalyst comprises the following steps: (1) placing gamma-alumina powder in a solvent, adding an amino-containing silane coupling agent, and heating for reaction to obtain modified gamma-alumina powder; and (2) preparing modified gamma-alumina powder loaded with trivalent iron salt or trivalent chromium salt, and drying to obtain the special catalyst for dehydrochlorination of tetrachloropropane. Iron ions or chromium ions complexed by an amino silane coupling agent improve the stability of the active component, the active component is attached to a gamma-alumina matrix by the catalyst, the activity of the main catalyst can be effectively regulated and controlled, the phenomena of chlorine absorption, coking and the like are reduced, the dehydrochlorination reaction is carried out when tetrachloropropane is in contact with the solid matrix, and the dehydrochlorination reaction is carried out when the tetrachloropropane is in contact with the solid matrix. On the basis of high conversion rate and selectivity, side reaction is avoided.

The invention relates to production equipment and a production method of 1, 1, 1, 2, 3-pentachloropropane, and belongs to the technical field of preparation of chemical intermediates. According to the invention, 1, 1, 1, 3-tetrachloropropane is adopted as an initial raw material, 1, 1, 1, 2, 3-pentachloropropane is produced through dehydrochlorination and chlorination in the serial tower reactor, and compared with a traditional two-step synthesis process of 1, 1, 1, 2, 3-pentachloropropane, after dehydrochlorination of 1, 1, 1, 3-tetrachloropropane and a 1, 1, 3-trichloropropene chlorination system are coupled, the process flow is shortened; compared with the existing one-pot synthesis process, the reaction is easier to control; a fixed bed catalyst system is adopted, the problems that traditional anhydrous ferric chloride catalyst powder is not easy to add, poor in dispersity and frequent to add are solved, saponification salt-containing wastewater is not discharged, the process is green and environmentally friendly, and the application prospect is wide.

Provided is a process for the preparation of 2-chloro-3, 3, 3-trifluoropropene (HCFO-1233xf) by contacting 1, 1, 2, 3-tetrachloro-1-propene (HCO-1230xa) and HF in the presence of a zinc doped alumina catalyst at a suitable temperature and in a suitable molar ratio of HCO-1230xa: HF. Also provided herein is a process for the preparation of 3, 3, 3-trifluoropropene (HFO-1243zf) by contacting 1, 1, 1, 3-tetrachloropropane (HCC-250fb) and HF in the presence of a zinc doped alumina catalyst at a suitable temperature and in a suitable molar ratio of HCC-250fb: HF.

The invention belongs to the field of organic synthesis technology, and in particular to a kind of 1,1,1,3 tetrachloropropane and its synthesis method.The synthetic method comprises the following steps:Carbon coated elemental iron catalyst, co-catalyst and carbon tetrachloride are added into reactor, ethylene is passed through to reaction pressure after being warming up to reaction temperature, after heat preservation and pressure holding are reacted, tetrachloropropane crude product is obtained, tetrachloropropane crude product is filtered, and 1,1,1,3 tetrachloropropane is obtained after distillation;The preparation method of coated elemental iron catalyst is:Ferric citrate is dissolved in ethanol, stirring is uniform, precursor solution is obtained, precursor powder is dried at 50 DEG C in a vacuum drying oven, and precursor powder is carried out high temperature pyrolysis under an inert atmosphere to obtain carbon coated elemental iron catalyst.1,1,1,3 tetrachloropropane synthetic reaction of the present invention has the advantages that carbon tetrachloride conversion is high, tetrachloropropane selectivity is high, reaction time is short and by-product generation amount is few.

The invention discloses a method and system for preparing 1, 1, 3-trichloropropene through gas phase cracking, and belongs to the technical field of organic synthesis.The method comprises the following steps that 1, 1, 1, 3-tetrachloropropane is preheated to be vaporized and then introduced into a tubular fixed bed reactor provided with a catalyst bed layer to be subjected to a dehydrochlorination reaction, and 1, 1, 3-trichloropropene is obtained; the catalyst bed layer is formed by stacking a self-supporting structured metal catalyst, and the self-supporting structured metal catalyst is made of one or a combination of more of iron, zinc, copper, cobalt and nickel; the self-supporting structured metal catalyst has an open-pore annular structure, the open-pore annular structure is selected from one of a Raschig ring, a Pall ring, a theta ring or a cascade ring, and the catalyst with the corresponding structure can realize high gas flux, carbon deposition blockage resistance and low mass transfer resistance, and is good in catalytic effect, less in carbon deposition and low in maintenance cost. The method provided by the invention has the advantages of high reaction conversion rate and good selectivity on 1, 1, 3-trichloropropene.

A method of synthesizing 3,3,3-trifluoropropene including contacting 1,1,1,3-tetrachloropropane, in the vapor phase, at a temperature sufficient to effect dehydrochlorination to form 1,1,3-trichloro-1-propene. The 1,1,3-trichloro-1-propene is isolated and subsequently contacted, in the vapor phase, with hydrogen fluoride in the presence of a fluorination catalyst at a temperature sufficient to effect formation of 3,3,3-trifluoropropene.

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.

The utility model discloses a reaction system for continuously preparing pentachloropropane and tetrachloropropane, which comprises a reaction kettle, a heat exchanger, a static mixer and a Venturi ejector which are connected in sequence, the reaction kettle comprises a reaction kettle body, a stirring device, a magnetic attraction device and a cooling and heating device, wherein the stirring device, the magnetic attraction device and the cooling and heating device are respectively arranged on the reaction kettle body. According to the utility model, iron powder is skillfully fixed in the reaction kettle and is uniformly distributed, so that a larger contact area between liquid and solid phases is provided, the formation of a divalent iron complex is accelerated, and an effective catalyst is supplemented for a reaction system in time. A large amount of circulating liquid can quickly remove reaction heat, and after newly added carbon tetrachloride and auxiliaries are uniformly mixed, vinyl chloride or ethylene gas is uniformly dissolved in the circulating liquid through the venturi ejector, so that the vinyl chloride or the ethylene gas reacts quickly.

The utility model relates to a device for continuously producing 1, 1, 1, 3-tetrachloropropane, which adopts a loop reactor in which a beam pipe is arranged, reaction raw materials ethylene and carbon tetrachloride are mixed at a venturi nozzle at the lower part of the reactor through a gas circulation loop and a liquid circulation loop outside the reactor, and then the mixture is fed into the reactor. And spraying into a reactor filled with a main catalyst. Reaction raw materials are circularly stirred under the action of a beam pipe in the reactor, so that solid, liquid and gas phases are fully mixed. According to the utility model, the gas raw material circulation loop and the liquid raw material circulation loop are adopted for double-circulation mixed reaction, so that the reaction conversion rate and selectivity can be improved, and industrial continuous production can be well realized.

The invention relates to 1, 1, 3, 3-tetra (mercaptomethylthio) propane, a preparation method thereof and an optical coating material, and belongs to the technical field of high-molecular optical materials.The preparation method of the 1, 1, 3, 3-tetra (mercaptomethylthio) propane comprises the steps that 1, 1, 3, 3-tetrachloropropane, tetrabutylammonium bromide and zinc acetate are taken and added into a mixed solvent, and a mixed solution is obtained; dropwise adding a mixed solution containing sodium hydrosulfide, ethanol and water, and carrying out temperature-controlled reaction to obtain a reaction solution; and adjusting the pH value of the reaction solution to 6-7, cooling to room temperature, filtering, drying, eluting an organic phase, and carrying out reduced pressure distillation on the filtrate to recover the solvent, thereby obtaining the 1, 1, 3, 3-tetra (mercaptomethylthio) propane. The preparation method has the characteristics of small environmental pollution, simple process and high yield, and the optical coating material has the advantages of high light transmittance, low haze value, high refractive index and adjustability.

The invention discloses a method for preparing 1,1,2,3-tetrachloropropylene, which belongs to the field of fine chemicals. 3-chloropropyne is used as a starting material, 3-chloropropyne is reacted with N-chlorosuccinimide ( NCS) is chlorinated under alkaline conditions to obtain 1,3-dichloropropyne; then chlorine is introduced under the action of a catalyst to prepare 1,1,2,3-tetrachloropropylene. The overall two-step process of the present invention is simple, the raw material market source is abundant, and after the step-by-step reaction, chlorine is finally added with a specific catalyst, which has the advantages of easy product purification, relatively high yield and low cost.

The present invention discloses a method for co-producing 3,3,3-trifluoropropene and 2,3,3,3-tetrafluoropropene, introducing 1,1,1,3-tetrachloropropane, 1,1,1,2,3-pentachloropropane and hydrogen fluoride into a first reactor to have a reaction in the presence of a first catalyst to obtain a reaction product of the first reactor; distilling the reaction product of the first reactor to obtain a 3,3,3-trifluoropropene product and a column bottom product, mixing the column bottom product with the hydrogen fluoride, and feeding a resulting mixture into a second reactor to have a reaction in the presence of a second catalyst to obtain a reaction product of the second reactor; and separating hydrogen chloride from the reaction product of the second reactor, and then carrying out water washing, alkali washing and drying to obtain a 2,3,3,3-tetrafluoropropene product. The present invention has the advantages of simple process, high efficiency, high operation flexibility, small investment and low energy consumption.

This invention discloses a catalyst for the chlorofluorination of 1,1,1,3-tetrachloropropane to prepare 2-chloro-3,3,3-trifluoropropylene, the catalyst being designated M. x O y / Fe p O q -MgF2, in which Fe p O q -MgF2 as support, Fe p O q It is a mixture of Fe2O3 and Fe3O4, M x O y M is the active component. x O y It consists of one or more of Al2O3, CuO, ZnO, and La2O3. The catalyst preparation method includes: adding a polyamine to an aqueous solution of a soluble magnesium salt at 30℃~60℃ with stirring, then adding hydrofluoric acid dropwise, and continuing stirring for 10min~60min after the addition is complete; adding a soluble iron salt to the above solution, and continuing stirring for 30min~90min; adding ammonia dropwise to adjust the pH to 8~10, and continuing stirring for 60min~180min; filtering, washing the filter cake with deionized water until the pH of the filtrate is ~7, drying at 80℃~120℃, and calcining at 200℃~260℃ to obtain the supported Fe. p O q The precursor salt of the active component is loaded onto a support using an impregnation method, dried at 80℃~120℃, and calcined at 260℃~320℃ to obtain the desired catalyst. The catalyst in this invention does not involve chromium or antimony compounds, and exhibits high selectivity and yield for 2-chloro-3,3,3-trifluoropropylene, making it valuable for industrial applications.

The invention discloses a co-production method for preparing pentachloropropane by chlorination of 1, 1, 1, 3-tetrachloropropane, and relates to the technical field of organic chemical synthesis, in particular to a co-production method for preparing pentachloropropane by chlorination of 1, 1, 1, 3-tetrachloropropane, which takes 1, 1, 1, 3-tetrachloropropane and chlorine as raw materials to react under the action of a solid chloride catalyst to prepare 1, 1, 1, 2, 3-pentachloropropane and co-produce 1, 1, 1, 3, 3-pentachloropropane. And 3, 3, 3-pentachloropropane is added. The molar ratio of the raw materials is 1.3: 1, chlorine is introduced from the bottom of the reactor, the reaction temperature is 50-120 DEG C, the pressure is 0-0.05 MPa, and at least one of aluminum chloride and the like can be selected as a catalyst. A reaction kettle is adopted, the temperature is initially increased to 80 DEG C, and chlorine is introduced; after the reaction, a crude product is separated by a negative pressure rectification system (containing a low-boiling-point rectification tower and a high-boiling-point rectification tower), unreacted raw materials are recycled by the low-boiling-point rectification tower, qualified 1, 1, 1, 2, 3-pentachloropropane is obtained at the top of the high-boiling-point rectification tower, 1, 1, 1, 3, 3-pentachloropropane is co-produced through tower kettle enrichment, and no sewage is generated in the whole process.

The invention discloses a preparation method of 2, 3, 3, 3-tetrafluoropropene, which comprises the following steps: by taking ethylene and carbon tetrachloride as raw materials, firstly preparing 1, 1, 1, 3-tetrachloropropane, then decomposing the 1, 1, 1, 3-tetrachloropropane to obtain 1, 1, 3-trichloropropene, reacting the 1, 1, 3-trichloropropene with hydrofluoric acid and chlorine to generate 1-chloro-3, 3, 3-trifluoropropene, and reacting the 1-chloro-3, 3, 3-trifluoropropene with hydrofluoric acid to prepare the 1, 1, 1, 3, 3-tetrafluoropropene. And finally, carrying out gas-phase dehydrochlorination on the 2, 2, 2-tetrafluoro-2-chloropropane to generate the 2, 3, 3, 3-tetrafluoropropene. According to the production route, raw materials are easy to obtain, the cost is low, unreacted raw materials can be recycled for continuous reaction, and emission of three wastes is little; the method is mild in liquid-phase fluorination condition and high in selectivity, and the yield of the intermediate product 2-chloro-1, 1, 1, 2-tetrafluoropropane is high.

The present application discloses a catalytic system for the preparation of 1, 1, 1, 3-tetrachloropropane, comprising an iron-based catalyst, the iron-based catalyst comprising iron and a halide of iron; and a cocatalyst selected from the group consisting of tributyl phosphate, tri (C2-C4 alkyl) phosphite, or a combination thereof. The invention also discloses a method for preparing 1, 1, 1, 3-tetrachloropropane, which comprises the following steps: i) in the presence of the catalytic system provided by the invention, introducing ethylene into a carbon tetrachloride solution in a certain manner, and reacting in a reaction zone at a reaction pressure p1 and a reaction temperature T to obtain a reaction product liquid; and ii) carrying out post-treatment on the reaction production liquid in a post-treatment area to obtain a target product.

The invention discloses a preparation process of 2, 3, 3, 3-tetrafluoropropene, which comprises the following steps: introducing ethylene into a mixed solution of carbon tetrachloride, a catalyst and a promoter for reaction, and separating and purifying to obtain 1, 1, 1, 3-tetrachloropropane; mixing the 1, 1, 1, 3-tetrachloropropane obtained in the step 1 with hydrogen fluoride, carrying out a fluorination reaction under the action of a catalyst, and carrying out deacidification and purification to obtain 3, 3, 3-trifluoropropene; 3, 3, 3-trifluoropropene obtained in the step 2 and chlorine are separated and purified under the action of an ultraviolet lamp, and then 2, 3-dichloro-1, 1, 1-trifluoropropane is obtained; and mixing the 2, 3-dichloro-1, 1, 1-trifluoropropane obtained in the previous step with hydrogen fluoride, carrying out a fluorination reaction under the action of a catalyst, and carrying out deacidification and purification to obtain the 2, 3, 3, 3-tetrafluoropropene. The raw materials are easy to obtain, the cost is low, the unreacted raw materials can be recycled for continuous reaction, the emission of three wastes is less, and the yield is high.

In a process for the production of 1,1,1,2,3-pentachloropropane, optionally in the presence of carbon tetrachloride, by introducing 1,1,1,3-tetrachloropropane, chlorine and a Lewis acid catalyst, the improvement comprising: introducing the Lewis acid as a slurry in a chlorinated hydrocarbon.

The invention discloses a compound polymerization inhibitor for improving the selectivity of 1, 2, 3-trichloropropene prepared from 1, 2, 2, 3-tetrachloropropane as well as a preparation method and application of the compound polymerization inhibitor. The compound polymerization inhibitor consists of the following components: a phenol polymerization inhibitor, an inorganic compound polymerization inhibitor, a regulator and a solvent. The compound polymerization inhibitor can efficiently inhibit further polymerization of 1, 2, 3-trichloropropene to generate by-products, so that the reaction selectivity is improved, and the separation difficulty of subsequent products is reduced. The compound polymerization inhibitor provided by the invention can effectively reduce excessive polymerization of 1, 2, 3-trichloropropene in the reaction process without influencing the reaction conversion rate, is not easy to block a pipeline, has high product selectivity, is easy for subsequent product separation and purification, and is suitable for industrial scale use. The compound polymerization inhibitor can be dissolved in a water phase, is simple to separate and has no influence on subsequent rectification. Meanwhile, a method for dehydrochlorination by using alkali liquor is adopted, so that the reaction conditions are mild, and the safety performance is high.

This invention discloses a method for preparing 2,3,3,3-tetrafluoropropylene. Using ethylene and carbon tetrachloride as raw materials, 1,1,1,3-tetrachloropropane (HCC-250fb) is first prepared. Then, 1,1,1,3-tetrachloropropane is decomposed to obtain 1,1,3-trichloropropene (HCC-1240za). This 1,1,3-trichloropropene is then reacted with chlorine to generate 1,1,1,2,3-pentachloropropane (HCC-240db). The 1,1,1,2,3-pentachloropropane is then decomposed to obtain 1,1,2,3-tetrachloropropene (HCC-1230xa). The 1,1,2,3-tetrachloropropene is reacted with hydrofluoric acid to generate 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf). Finally, 2,3,3,3-tetrafluoropropylene is prepared using two different methods. This invention has low raw material costs and high yield.

Disclosed is a continuous preparation method for 1,1,1,2,3-pentachloropropane. 1,1,1,3-tetrachloropropane and chlorine are continuously introduced into a reactor respectively and are subjected to a reaction under the action of a solid oxide catalyst to obtain the 1,1,1,2,3-pentachloropropane. The reaction is a gas-liquid-solid three-phase reaction, the 1,1,1,3-tetrachloropropane is introduced from the top of the reactor, and the chlorine is introduced from the top or the bottom of the reactor. The reaction condition is mild and the process is simple. In addition, the process also has the advantages of less three wastes, good conversion rate of 1,1,1,3-tetrachloropropane, high product selectivity, stable catalyst, and capability of achieving continuous production and the like, and has a wide industrial application prospect.

This invention discloses a metal-carbon composite catalyst and method for the continuous preparation of 1,1,1,3-tetrachloropropane. The main component of the catalyst is Cu-Ni-Cl-C / Fe, and the catalyst preparation process includes four steps: mixing, carbonization, displacement, and loading. The catalyst of this invention can efficiently catalyze the telomerization reaction of carbon tetrachloride and ethylene, generating the target product 1,1,1,3-tetrachloropropane with high selectivity. The catalyst exhibits stable performance, maintaining good catalytic effect even after five repeated uses. The conversion rate of carbon tetrachloride and ethylene reaches over 95%, and the selectivity of 1,1,1,3-tetrachloropropane is greater than 98.5%.

The application discloses a method for co-production of 3,3,3-trifluoropropene and 2,3,3,3-tetrafluoropropene, which comprises the following steps: feeding 1,1,1,3-tetrachloropropane, 1,1,1,2,3-pentachloropropane and hydrogen fluoride into a first reactor, and reacting under the action of a first catalyst to obtain a first reactor reaction product; rectifying the first reactor reaction product to obtain 3,3,3-trifluoropropene product and a column still product; mixing the column still product with hydrogen fluoride, and feeding the mixture into a second reactor to react under the action of a second catalyst, so as to obtain a second reactor reaction product; and separating hydrogen chloride from the second reactor reaction product, washing with water, washing with alkali, drying and then obtaining 2,3,3,3-tetrafluoropropene product. The method has the advantages of simple process, high efficiency, large operation flexibility, low investment and low energy consumption.

The invention discloses a preparation method for synthesizing 3, 3, 3-trifluoropropene under the assistance of organic amine, which comprises the following steps: by taking 1, 1, 1, 3-tetrachloropropane and hydrogen fluoride as raw materials, metal chloride as a catalyst and organic amine as a cocatalyst, carrying out one-step liquid phase reaction to synthesize the 3, 3, 3-trifluoropropene; the molar ratio of 1, 1, 1, 3-tetrachloropropane to hydrogen fluoride is (1: 1)-(1: 100), the reaction temperature is 50-200 DEG C, the reaction pressure is 0-3Mpa, and the reaction time is 0.25-7h. The method disclosed by the invention is simple in process route, few in three wastes and green and environment-friendly; the catalyst has low requirements on equipment, is cheap and easy to obtain and can be recycled; under the condition of organic amine assisted catalysis, the catalyst has the advantages of high conversion rate and high selectivity.

The invention discloses a supported catalyst and method for preparing 1, 1, 1, 3-tetrachloropropane, and belongs to the technical field of industrial catalysis and organic chemistry, the supported catalyst comprises an alumina carrier and a ferrous chloride-phosphate ester complex active component supported by the alumina carrier; active components of the ferrous chloride-phosphate complex are loaded on the alumina carrier through an impregnation method, and an impregnation solution is prepared from anhydrous ferrous chloride, anhydrous phosphate and an anhydrous organic solvent in an anhydrous environment. The supported catalyst is simple and convenient in preparation process, low in cost, high in catalytic activity, high in carbon tetrachloride conversion rate, good in 1, 1, 1, 3-tetrachloropropane selectivity, easy to recycle, good in reusability and easy to popularize and use, and the problem that an existing catalyst is difficult to recycle or prone to inactivation can be solved.

Processes for making 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) by contacting 1,1,2,3-tetrachloro-1-propene (HCO-1230xa) and HF at suitable temperatures and suitable HCO-1230xa:HF mole ratios in the presence of a zinc doped alumina catalyst are provided. Also provided herein are processes for making 3,3,3-trifluoropropene (HFO-1243zf) by contacting 1,1,1,3-tetrachloropropane (HCC-250fb) and HF at suitable temperatures and suitable HCC-250fb:HF mole ratios in the presence of a zinc doped alumina catalyst.

The invention provides a method for continuously preparing 1, 1, 2, 3-tetrachloropropene through ultrasonic catalysis, and relates to the technical field of preparation of 1, 1, 2, 3-tetrachloropropene. The method comprises the following steps: 1, 1, 1, 1, 3-tetrachloropropane continuously enters a first ultrasonic reaction kettle, a catalyst is added for reaction, and 1, 1, 1, 3-tetrachloropropane is partially converted into 1, 1, 3-trichloropropene; the liquid mixture reacted in the first ultrasonic reaction kettle and chlorine gas continuously enter a second ultrasonic reaction kettle, a catalyst is added for continuous reaction, and 1, 1, 3-trichloropropene is chlorinated and converted into 1, 1, 1, 2, 3-pentachloropropane; a liquid mixture reacted in the second ultrasonic reaction kettle continuously enters a third ultrasonic reaction kettle, a catalyst is added for continuous reaction, and 1, 1, 1, 2, 3-pentachloropropane is converted into 1, 1, 2, 3-tetrachloropropene. The catalyst is subjected to ultrasonic treatment in an ultrasonic kettle to form a uniform system, and the concentration of the catalyst is 0.001%-0.9%. The catalyst is good in dispersity, simple in process and easy for continuous production.

This invention discloses a method for synthesizing 1,1,1,3-tetrachloropropane, belonging to the field of fine chemical intermediate synthesis technology. The method uses chloroform, chlorine, and ethylene as raw materials. Chloroform is mixed with a specific solid chloride catalyst as a mother liquor and added to a reactor. Chlorine and ethylene are continuously introduced from the bottom of the reactor. An addition reaction occurs under reaction conditions of 80-120℃ and 0.5-1.5 MPa, wherein the molar ratio of chloroform, chlorine, and ethylene is controlled at 1.6:0.8:1. The crude product generated is separated by distillation in a recovery tower, and unreacted chloroform and ethylene are returned to the reactor for recycling. No wastewater is generated throughout the reaction process. This invention features a simple process, high reaction selectivity, high catalyst activity and reusability, significantly improved raw material utilization, low equipment material requirements, low investment, and easy implementation for continuous industrial production. It overcomes the technical shortcomings of existing technologies, such as numerous by-products, complex control, large catalyst consumption, and difficult wastewater treatment.