208results about "Preparation by halogen halide addition" patented technology

Natural renewable resources are used as raw materials, efficient and environment-friendly catalytic performance is achieved through multi-stage optimization, coconut shells, fruit shells, reeds and wood chips are used as base materials in the process, a channel template is introduced after fine crushing, a graded pore structure is constructed, and the mercury-free catalyst is prepared. Dynamic extrusion forming and program temperature control carbonization-activation technologies are adopted to form an active carbon skeleton with a high specific surface area, a pulsating pressure impregnation system is innovatively designed, ultrasonic vibration is combined to strengthen copper chloride solution permeation, deep and uniform loading of active components is realized, and a mixed pickling process is developed in a matched manner. Metal impurities are efficiently removed through the synergistic effect of hydrochloric acid and citric acid, and the obtained catalyst has three-dimensional through pore channels and high-activity component dispersity, can replace a traditional mercury-containing catalyst to be applied to the fields of vinyl chloride synthesis and the like, remarkably reduces the risk of environmental pollution, improves the reaction selectivity and prolongs the service life of the catalyst, and is suitable for industrial production. And a technical support is provided for green transformation of the chemical industry.

This invention relates to a method for using a low-content ruthenium-based catalyst modified with nitrogen and oxygen ligands in the hydrochlorination of acetylene. The invention utilizes 2-pyridine carboxylate as a ligand, commercial activated carbon as a support, trace amounts of ruthenium as the main active component, and water as a solvent. An improved synthesis procedure yields a low-content ruthenium-based catalyst with ruthenium ions coordinated by a modifier and commercial activated carbon as a support, significantly improving catalyst performance while reducing ruthenium content. This catalyst exhibits high activity and vinyl chloride selectivity in the fixed-bed hydrochlorination of acetylene to vinyl chloride, and its low cost makes it highly valuable for industrial applications. The ruthenium loading is 0.1%, and the reaction gas space velocity is 170 h⁻¹. ‑1 V (C2H2) / V (HCl) With a ratio of 1:1.05 and a reaction temperature of 180℃, the acetylene conversion rate can reach 84.3%, the vinyl chloride selectivity is greater than 99%, and the activity remains basically unchanged within 10 hours.

To provide a method for efficiently producing β-bromoethylbenzene while enabling miniaturization of an electromagnetic wave irradiation device and reducing formation of by-products such as photopolymers and dimers.SOLUTION: A method for producing β-bromoethylbenzene comprises: irradiating hydrogen bromide gas with electromagnetic waves; and contacting the hydrogen bromide gas irradiated with electromagnetic waves with styrene.SELECTED DRAWING: Figure 2

The invention relates to a preparation method of a high-stability copper-based catalyst for acetylene hydrochlorination reaction, which comprises the following steps: by taking P3 (diethyl p-toluenesulfonyloxymethylphosphonate) as a phosphorus modifier, commercial activated carbon as a carrier, copper chloride as a main active component and absolute ethyl alcohol as a solvent, preparing a copper-based catalyst by a hydrothermal method; the phosphorus-modified high-stability copper-based catalyst is prepared by improving the synthesis steps, and the inactivation condition of the catalyst in the reaction process is inhibited while the performance of the copper-based catalyst is improved. The catalyst has relatively high activity and vinyl chloride selectivity in a reaction for preparing vinyl chloride through acetylene hydrochlorination on a fixed bed, is relatively low in cost and has relatively high industrial application value. Under the conditions that the reaction gas space velocity is 170h <-1 >, V (C2H2) / V (HCl) is 1: 1.05 and the reaction temperature is 180 DEG C, the acetylene conversion rate can reach 71%, the vinyl chloride selectivity is greater than 99%, and the activity is basically kept unchanged within 7.5 h.

The invention relates to the technical field of transition metal catalysts, in particular to a transition metal / alkali metal bimetallic monatomic catalyst for catalyzing acetylene hydrochlorination reaction and a preparation method and application of the transition metal / alkali metal bimetallic monatomic catalyst. After dipping in an alkali metal nitrate solution, the alkali metal is firstly converted into a metal oxide through two-stage calcination, and then the metal oxide is converted into a super-strong alkali metal monatomic material containing a high defect site. And dipping the alkali metal monatomic catalyst in a transition metal salt solution to obtain the transition metal / alkali metal bimetallic monatomic catalyst. Transition metal monatomic serves as a main active center, alkali metal monatomic serves as a super alkali auxiliary, the microenvironment of active sites is greatly improved, the adsorption capacity of the transition metal sites to reactants is enhanced, meanwhile, carbon deposition side reaction can be inhibited, and synergistic catalysis between transition metal and alkali metal monatomic is achieved; the catalyst shows high catalytic activity and stability on acetylene hydrochlorination reaction.

The invention belongs to the technical field of catalyst continuous flow method preparation, and particularly relates to a method for preparing a supported copper-based catalyst by using a sectional continuous flow technology. The sectional continuous flow method has the advantages of automatic continuous production, accurate control of reaction conditions, uniform mixing of materials, reduction of personal errors and the like, and effectively solves the problems of long time consumption, easy non-uniform mixing, poor repeatability and the like of an impregnation method. Secondly, the active carbon serves as a carrier, copper serves as a main active component, ethyl alcohol serves as a solvent, the sectional type continuous flow technology is utilized, the particle size of copper species is regulated and controlled by adjusting the gas flow rate, the copper-based catalyst which is evenly distributed, small in particle size and high in activity is prepared, the production efficiency of the catalyst is improved, and meanwhile the catalyst yield is increased. And the catalytic performance of the catalyst in the reaction of preparing vinyl chloride from acetylene and hydrogen chloride is optimized.

The invention discloses a process for continuously producing chloroethane by using byproduct hydrogen chloride, which belongs to the field of chloroethane production, and comprises the following steps: (1) catalytic reaction: fully mixing hydrogen chloride and ethylene, and feeding the mixture into a reactor for reaction to generate a gas phase and a liquid phase; (2) multi-stage condensation: after the gas phase of the reactor is subjected to first-stage circulating water cooling condensation and second-stage refrigerant cooling, most of chloroethane is cooled to a crude product tank, and a small amount of residual chloroethane and hydrogen chloride enter the reactor through a compressor; and (3) recycling hydrogen chloride: a gas phase obtained by secondary condensation mainly comprises hydrogen chloride, and is recycled to the bottom of the reactor for continuous reaction after being pressurized by a compressor, the process flow is simple, the purity of chloroethane is high, the production consumption is low, and recycling and continuous production of chloroethane are realized.

The invention relates to a copper-based catalyst for catalyzing acetylene hydrochlorination and a preparation method and application thereof, the copper-based catalyst comprises a carrier, a phosphine-containing ligand and a copper-containing stable metal precursor; the molar ratio of the stable-state metal precursor to the phosphine-containing ligand is (2: 1)-(16: 1), and the mass of copper in the copper-containing stable-state metal precursor is 5-10% of the mass of the copper-based catalyst. For a copper-based catalyst containing ligand dimethyl phosphine oxide, when reaction gas contains a certain amount of water vapor, the activity and selectivity of the catalyst are still maintained at a relatively high level; when the reaction gas contains a certain amount of hydrogen, the influence on the activity and selectivity of the catalyst is small, which indicates that the catalyst has excellent hydrophobicity and reduction resistance in the acetylene hydrochlorination reaction, thereby not only enhancing the generation efficiency of the vinyl chloride monomer, but also prolonging the service life of the catalyst and lowering the production cost.

The present invention discloses a preparation method and a use method of a Cu-based catalyst for the preparation of vinyl chloride by acetylene hydrochlorination in a fixed bed. This method adopts an "in-situ loading + pyrolysis activation" strategy. By means of the physical barrier, chemical coordination of the polymer network to the copper salt precursor during the polymerization process of vinyl monomers and the in-situ anchoring effect of the N sites in the subsequent polymer pyrolysis products on Cu atoms, the dispersion of Cu species on the surface of the carrier is significantly improved, and their agglomeration is effectively inhibited. Further modification with sulfur-containing inorganic compounds and quaternary phosphonium salt ionic liquids can further enhance the valence stability of Cu sites and effectively inhibit reaction carbon deposition, improving the long-term reaction stability of the catalyst. The present invention develops a new type of Cu-based catalyst and proposes a preparation technology. Applying this catalyst to the reaction of acetylene hydrochlorination to prepare vinyl chloride in a fixed bed has good catalytic activity and reaction stability.

The invention discloses a preparation method of a bimetallic complex catalyst for acetylene hydrochlorination reaction, and the preparation method comprises the following steps: mixing an aldehyde compound and an amine compound in a solvent at room temperature, fully stirring and reacting to generate a polydentate ligand, then adding a copper salt and a cobalt salt, and reacting to obtain the bimetallic complex catalyst for acetylene hydrochlorination reaction. And fully stirring the obtained mixture for reaction to generate a bimetallic complex, mixing the obtained reaction liquid with an acid-washed activated carbon carrier, fully stirring and dipping, drying, and cooling to obtain the bimetallic complex catalyst for acetylene hydrochlorination reaction. The bimetallic complex catalyst prepared by the invention has good activity and carbon deposition resistance, and has good catalytic activity, vinyl chloride selectivity and stability in the process of generating vinyl chloride through acetylene hydrochlorination reaction.

The present invention relates to the technical field of catalyst preparation, and in particular to a platinum-ionic liquid complex catalyst for catalyzing acetylene hydrochlorination reaction, and a preparation method and application thereof. The present invention provides a catalyst using asphalt-based spherical activated carbon as a carrier, H 2 PtCl 6 6H 2 O is a metal precursor and triphenylmethylphosphine chloride is a platinum-ionic liquid complex catalyst. 6 ] 2‑ The strong interaction between the precursor and the ligand effectively regulates the electronic properties of the active metal, promotes the anchoring and dispersion of platinum active species on the carrier surface, and enhances the catalyst's adsorption and activation ability for hydrogen chloride and acetylene, thereby significantly improving the activity and stability of the catalyst. The preparation method is simple and efficient, and has great value for industrial application and promotion.

The invention discloses an aluminum oxide loaded ruthenium-erbium-cerium tri-metal catalyst for acetylene hydrochlorination reaction as well as preparation and application of the aluminum oxide loaded ruthenium-erbium-cerium tri-metal catalyst. The catalyst comprises a carrier and a metal active component loaded on the carrier, wherein the carrier is porous alumina; the alumina-loaded ruthenium-erbium-cerium tri-metal catalyst is prepared by the following steps: uniformly adsorbing a salt solution containing ruthenium salt, erbium salt and cerium salt onto a carrier through wet impregnation, and then drying and calcining in an air atmosphere to obtain the alumina-loaded ruthenium-erbium-cerium tri-metal catalyst. The invention provides application of the catalyst in acetylene hydrochlorination reaction. The aluminum oxide loaded ruthenium-erbium-cerium trimetal catalyst is applied to acetylene hydrochlorination reaction, the acetylene conversion rate is high, the vinyl chloride selectivity is high, and the catalyst stability is good.

The invention belongs to the technical field of catalysts, and particularly relates to a waste PVC derived carbon composite metal material and a preparation method and application thereof. The waste PVC derived carbon composite metal material comprises a carbon carrier, an active component and a modification reagent, wherein the active component and the modification reagent are loaded in the carbon carrier. According to the present invention, with the introduction of the modification reagents, the electronic structure around the active component metal is adjusted, such that the two modification reagents and the active metal component produce the synergistic effect, the metal component can be stably anchored on the carbon carrier, the dispersibility of the active metal is significantly improved, and the catalytic performance of the catalyst is further improved. Meanwhile, the coordination effect between the active metal component and the modification reagent inhibits the loss of the active metal, the content of the active metal component in a high valence state is increased, and the carbon deposition content in the catalyst is also obviously reduced.

The invention relates to an amino silane coupling agent modified halloysite nanotube mercury-free catalyst for acetylene hydrochlorination reaction. The catalyst comprises a carrier and an active component. The carrier is a halloysite nanotube modified by one or more amino silane coupling agents. The active component is one or a combination of more of halides and complexes of precious metals such as gold, silver, rhodium, palladium, platinum and ruthenium, and the mass ratio of the single active component to the carrier is 0.01-1%. The preparation method of the catalyst adopts a preparation method combining a reflux method and an ultrasonic / microwave-assisted impregnation method, and comprises the following two steps: 1) grafting an amino silane coupling agent by adopting the reflux method to modify halloysite nanotubes; and 2) loading an active component on the halloysite nanotube obtained in the step 1) by using an ultrasonic / microwave-assisted impregnation method.The catalyst prepared in the invention shows good catalytic performance in an acetylene hydrochlorination reaction process, the acetylene conversion rate reaches 97.34%, and the vinyl chloride selectivity reaches up to 99.68%.

The application discloses an Au / HOF-Co0.5Fe0.5 catalyst for acetylene hydrochlorination reaction and a preparation method and application thereof. The Au / HOF-Co0.5Fe0.5 catalyst comprises a carrier and a gold active component loaded on the carrier, and the carrier is a doped hydrogen-bonded organic framework HOF-Co0.5Fe0.5. The application provides application of the Au / HOF-Co0.5Fe0.5 catalyst in a reaction of synthesizing chloroethylene through acetylene hydrochlorination, and the catalyst has good stability and high activity.

The invention relates to the field of chemical equipment, and discloses a production device and method of 1, 1-difluoroethane. The production apparatus comprises: a reactor; a reflux tower and a first condenser, a feed inlet and a liquid phase outlet of the reflux tower are connected with the reactor, a gas phase outlet of the reflux tower is connected with the first condenser, and a gas phase outlet of the first condenser is connected with the reactor; the separation tower is connected with a liquid phase outlet of the first condenser, a liquid phase outlet of the separation tower is connected with the reactor, a gas phase outlet of the separation tower is connected with the second condenser, a gas phase outlet of the second condenser is connected with the reactor, and a liquid phase outlet of the second condenser is connected with the separation tower; and the post-treatment system is connected with the liquid phase extraction port of the separation tower. The production device can be used for separating and recycling hydrogen fluoride, reducing the content of hydrogen fluoride in the product, eliminating the consumption of fresh water and alkali liquor caused by a water alkali washing process, avoiding the generation of aqueous hydrofluoric acid with low additional value, and eliminating a heavy component removal tower.

The invention belongs to the technical field of continuous flow preparation of catalysts, and particularly relates to a method for preparing a ruthenium-based catalyst by using a sectional continuous flow technology in a reaction for preparing vinyl chloride through acetylene hydrochlorination. According to the catalyst, activated carbon is used as a carrier, ruthenium is used as a main active component, water is used as a solvent, a sectional type continuous flow technology is utilized, the dispersity of Ru species is accurately regulated and controlled by adjusting the gas flow rate, the high-dispersion and high-activity ruthenium-based catalyst is prepared, and the catalytic performance is optimized while the production efficiency of the catalyst is improved. Meanwhile, by adopting a sectional type continuous flow preparation method, automatic continuous production is realized, the reaction flow rate can be accurately controlled, materials can be uniformly mixed, personal errors are reduced, and the method has remarkable industrial application potential.

The present disclosure provides an integrated process for producing trifluoroiodomethane (CF3I), in three steps: a) reacting a first reactant stream comprising hydrogen (H2) and iodine (I2) in the presence of a first catalyst to produce a first product stream comprising hydrogen iodide (HI); (b) reacting the first product stream with a second reactant stream comprising trifluoroacetyl chloride (TFAC) in the presence of a second catalyst to produce an intermediate product stream comprising trifluoroacetyl iodide (TFAI); and (c) reacting the intermediate product stream to produce a final product stream comprising trifluoroiodomethane. (CF3I).

To provide a process for making 2,3,3,3-tetrafluoropropene (HFO-1234yf) from a composition including 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb).SOLUTION: A method includes providing a composition including 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb) to a reactor including a heater surface at a surface temperature greater than about 850°F (454°C), and then bringing the composition into contact with the heater surface for a contact time of less than 10 seconds to dehydrochlorinate a portion of the HCFC-244bb to make HFO-1234yf.SELECTED DRAWING: Figure 1

Provided is a method for producing monofluoroethane, which enables production of monofluoroethane from ethylene and hydrogen fluoride at a high conversion rate even under mild reaction conditions. This method for producing monofluoroethane comprises reacting ethylene gas with hydrogen fluoride gas in the presence of a catalyst to obtain monofluoroethane. The catalyst contains a chromium compound, which is at least one selected from chromium fluoride and chromium oxyfluoride.

The present application provides a process for producing vinyl chloride using a mercury-free catalyst, belonging to the technical field of synthesis of vinyl chloride by acetylene method. The process controls the parallel or counter-current heat exchange of the first and second stage converters, and uses different heat exchange media in the first and second stage converters, so as to match the temperature requirements of the catalysts at different periods and different positions, ensure that the catalysts are always in the active temperature range throughout the life cycle, prevent the catalyst from flying temperature, and prolong the service life of the catalyst. The number of catalyst turnover can also be reduced, and the loss of catalyst pulverization can also be reduced.

The invention discloses a preparation method of a carbon-doped boron nitride catalyst and application of the carbon-doped boron nitride catalyst in synthesis of vinyl chloride through acetylene hydrochlorination. Comprising the following steps: 1) dissolving a boron source and a nitrogen source in a solvent to prepare a mixed solution; 2) heating, drying and calcining the solution obtained in the step 1) to obtain a porous boron nitride precursor; and 3) introducing a carbon source, and carrying out CVD treatment on the precursor obtained in the step 2) to obtain the carbon-doped boron nitride catalyst. The carbon-doped boron nitride catalyst disclosed by the invention can be applied to acetylene hydrochlorination to prepare and synthesize vinyl chloride, the conversion per pass of acetylene is 88.4% or above, the selectivity of vinyl chloride is 99.2% or above, and the service life can reach 400 hours or above. The method has the characteristics of simple and environment-friendly catalyst preparation process, low cost, excellent performance, small industrialization difficulty, good process repeatability and the like, is expected to replace a mercury catalyst in the existing calcium carbide process, and solves the problem of mercury emission pollution.

The invention belongs to the technical field of catalyst preparation, and discloses a method for preparing a gold-based catalyst by taking alluvial gold as a gold source and application of the gold-based catalyst in acetylene hydrochlorination reaction, the alluvial gold is treated with aqua regia after being treated with acid, and a gold-containing solution is obtained; and adding the carrier into a gold-containing solution, and reacting under reflux to obtain the gold-based catalyst. According to the invention, the use of alluvial gold as a brand new gold source is helpful for reducing the dependence on expensive gold resources, promoting the development of green chemical processes, and bringing significant economic and environmental benefits to related industries. The cost is reduced, the acetylene hydrochlorination reaction is facilitated, and the activity and the stability of the gold-based catalyst can be remarkably improved. The eutectic solvent can regulate and control the electronic structure of an active site, and is more beneficial to adsorption and reaction of acetylene and hydrogen chloride, so that the reaction activity and selectivity are improved.

The present invention provides a gas-liquid phase vinyl chloride production device and process, which belongs to the technical field of vinyl chloride production, including a reaction tower, a liquid distributor, a gas distributor, a demister, a liquid catalyst circulation mechanism, and a condenser; the reaction tower is provided with a gas-liquid reaction zone, a liquid catalyst inlet, and a liquid catalyst outlet, a mixed gas inlet at the bottom, and a reaction gas outlet at the top; the liquid distributor is arranged in the reaction tower; the gas distributor is arranged in the reaction tower; the demister is used to recover the liquid catalyst droplets entrained in the reaction gas; the liquid catalyst circulation mechanism is arranged outside the reaction tower; and the condenser is arranged outside the reaction tower, which is used to collect the reaction gas and cool it down. It is intended to solve the technical problems in the prior art that gas-solid phase reactions are often accompanied by serious temperature runaway and surface carbon accumulation, which easily cause catalyst deactivation, and there are many side reactions, and the product impurity content is high, which puts pressure on the fine manufacturing of subsequent products.

The specification describes a process for the production of vinyl chloride monomer (VCM) from acetylene and HCl. The process involves a primary reactor and a secondary reactor each comprising a hydrochlorination catalyst. The feed from the primary reactor is sent to a knockout drum. The feed from the secondary reactor is split, part is combined with the feed from the primary reactor while the other part is sent to a vent recovery unit. The vent recovery unit includes one or more stages in which liquid containing VCM is separated and sent directly to the KO drum. A cold vapor is generated from the KO drum which is sent to a compressor, followed by a lights separation unit and a lights column.

The application discloses a polyethylene nanofiber supported gold-ion liquid catalyst for catalyzing acetylene hydrochlorination reaction and a preparation and application thereof. The polyethylene nanofiber supported gold-ion liquid catalyst comprises a carrier and a gold active component and an ion liquid supported on the carrier, and the carrier is polyethylene nanofiber. The application provides application of the polyethylene nanofiber supported gold-ion liquid catalyst in a reaction of catalyzing acetylene hydrochlorination to synthesize chloroethylene, solves the problems of reduction loss of high-valence Au and carbonization denaturation or even loss of the ion liquid caused by reaction heat of the supported Au-ion liquid system catalyst in the acetylene hydrochlorination reaction, and makes the catalyst have higher stability.

The application belongs to the field of vinyl chloride synthesis process, and particularly relates to a vinyl chloride synthesis process device capable of reducing the loss of gold-based catalysts. The device comprises a converter A, a converter B, a raw material gas pipeline, a front-back station interconnection pipeline and a crude vinyl chloride pipeline; a first valve is arranged between the raw material gas pipeline and the converter A, a second valve is arranged between the front-back station interconnection pipeline and the converter A, a fourth valve is arranged between the crude vinyl chloride pipeline and the bottom of the converter A, a third valve is arranged between the bottom of the converter A and the front-back station interconnection pipeline, a fifth valve is arranged between the raw material gas pipeline and the upper part of the converter B, a sixth valve is arranged between the front-back station interconnection pipeline and the converter B, an eighth valve is arranged between the bottom of the converter B and the crude vinyl chloride pipeline, and a seventh valve is arranged between the bottom of the converter B and the front-back station interconnection pipeline. The application can reduce the loss of gold components in the production process, improve the recovery rate of gold-based catalysts, and has a good application prospect.

The application discloses a method for preparing a monatomic mercury catalyst by using a waste mercury catalyst as a raw material and a product thereof. The method comprises the following steps: mixing the waste mercury catalyst with a mercury chloride gasification aid, and then heating to 300-350 DEG C in an inert gas flow to perform catalytic gasification; and using a defective carbon carrier to adsorb and capture mercury chloride in tail gas of the catalytic gasification to obtain the monatomic mercury catalyst. The mercury chloride gasification aid comprises at least one of potassium nitrate, sodium nitrate, barium nitrate, zinc nitrate and cerium nitrate. The application adopts the method of catalytic gasification-defective capture to obtain the high-performance monatomic mercury catalyst in one step by using the waste mercury catalyst as a raw material. Meanwhile, the carbon carrier after catalytic mercury extraction is crushed, bonded and formed into a shape, and catalytic carbonization is performed to obtain a chlorinated defective carbon carrier, which is used as a carrier of the monatomic mercury catalyst again, so that the waste mercury catalyst is fully recycled and utilized.

The present invention relates to a vinyl chloride synthesis reaction process, and in particular to an acetylene method vinyl chloride synthesis reaction process, comprising: (1) a mixed raw material gas A is subjected to an adiabatic catalytic reaction to obtain a mixed gas B; (2) the mixed gas B is subjected to an isothermal catalytic reaction to obtain a mixed gas C containing vinyl chloride, and the mixed gas C enters a post-processing system. The present invention adopts radial and two-stage catalytic reactions, eliminates a separate raw material gas preheater, reduces the number of equipment, saves equipment investment, reduces reaction pressure drop, prolongs catalyst life, and improves subsequent reaction efficiency, so that the conversion rate is greater than 98.5% and the selectivity is greater than 99%.