157results 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 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 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 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).

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 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 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 invention discloses a method for upgrading and recycling polyvinyl chloride through mechanochemical catalysis, which comprises the following steps: putting polyvinyl chloride and a triboelectric material into a ball-milling tank, then adding olefin or alcohol into the ball-milling tank, putting the ball-milling tank on a ball mill, and carrying out ball-milling mechanical chemical reaction, so as to obtain a product comprising chlorinated organic matters after the reaction is finished. According to the invention, hydrogen chloride generated by polyvinyl chloride (PVC) dechlorination, a hydrochlorination reaction of olefin and a chlorination reaction of alcohol are connected in series, and the series mechanochemical reaction is carried out under a solvent-free mild condition by means of a cheap triboelectric catalyst. According to the invention, a good ratio of the PVC, the triboelectric material and the substrates (olefin and alcohol) is preferably selected, and dual purposes of PVC degradation and chlorine resource recovery are achieved.

The invention discloses a polyamido pinene formaldehyde adsorbent and a preparation method thereof, the method comprises the following steps: S1, adding carbon tetrachloride into alpha-pinene, stirring at 0 DEG C, dropwise adding liquid bromine, reacting for a certain time, then washing to remove residual liquid bromine, and performing rotary evaporation to remove carbon tetrachloride to obtain 2, 6-dibromocamphane; s2, dropwise adding m-phenylenediamine into the 2, 6-dibromocamphane, reacting for a certain time at 30 DEG C, and then removing residual m-phenylenediamine by rotary evaporation to obtain polyaminophenene; and S3, loading the polyamido pinene on the base material to obtain the polyamido pinene formaldehyde adsorbent.

The invention relates to the technical field of catalyst preparation, in particular to a mercury-free catalyst and a preparation method and application thereof. The preparation method of the mercury-free catalyst comprises the following steps: adding a copper salt, an active auxiliary agent and an iridium compound into ethanol to obtain a mixed solution; and impregnating the mixed solution in the pretreated activated carbon by adopting an equivalent-volume impregnation method, standing, and drying to obtain the mercury-free catalyst. The preparation method is simple in steps and easy to operate, and the prepared catalyst has the advantages of being high in catalytic activity, good in stability, long in service life, free of mercury, environmentally friendly and the like.

This specification describes a method for producing vinyl chloride monomer (VCM) from acetylene and HCl. This method involves a primary reactor and a secondary reactor, each containing a hydrogenation catalyst. The feed from the primary reactor is sent to a knockout drum. The feed from the secondary reactor is split, with a portion combined with the feed from the primary reactor, while the other portion is sent to a vent recovery unit. The vent recovery unit includes one or more stages where a liquid containing VCM is separated and sent directly to the KO drum. Low-temperature vapor is generated from the KO drum, sent to a compressor, and subsequently sent to a light component separation unit and a light component column.

The invention discloses a mercury catalyst added with a silver element and a preparation method and application thereof, and relates to the technical field of polyvinyl chloride production, the preparation method comprises the following steps: obtaining a graphene carrier; dipping a solution A containing a silver source on the graphene carrier, and then performing first drying to obtain a catalyst precursor; and dipping a solution B containing a mercury source on the catalyst precursor, and then carrying out second drying to obtain the mercury catalyst. Compared with a traditional mercury catalyst, the catalyst provided by the invention has better catalytic stability, and can maintain a higher catalytic effect in a long-time use process. The catalyst provides a greener and more efficient solution for the production of PVC (Polyvinyl Chloride).

The present invention provides a method for preparing a supported carbon catalyst, the method comprises at least the following steps: (1) contacting a gas containing an organic silicon source with a silicon oxide-based material to obtain a precursor; (2) contacting the precursor with a gas containing an organic carbon source to obtain the supported carbon catalyst. The temperature and energy consumption of the chemical vapor deposition of heteroatom-containing carbon material on silica-based materials can be greatly reduced in this method, and the cost of the catalyst can be effectively reduced.

The application discloses a gold single-atom catalyst for catalyzing acetylene hydrochlorination reaction and a preparation method and application thereof. Activated carbon is added to an ethanol solution containing a triazine nitrogen-containing heterocyclic organic compound and an alkali metal bromide, stirred and dried, and then calcined under a nitrogen atmosphere to obtain a treated carrier; the treated carrier is mixed with a gold precursor solution, and then stirred under a protective gas. The gold single-atom catalyst prepared by the application can preferentially form a coordination action with N atoms in the carrier through the introduced alkali metal atoms, thereby promoting the subsequent active component Au to mainly form a coordination action with C. Since the two have similar electronegativities, the active component Au can exist in a lower valence state more, the content of the active component Au in +1 and +3 valences is significantly increased, the stability of the active component in the catalyst is improved, the catalytic activity and stability are improved, and the production of carbon deposition can be reduced.

The invention belongs to the technical field of vinyl chloride, and discloses a method for preparing vinyl chloride from calcium carbide acetylene. The method comprises the following steps: mixing dry acetylene and hydrogen chloride gas, preheating, feeding into a vinyl chloride conversion process, and reacting the mixed gas under the action of a two-stage converter and a mercury-free gold-based catalyst to generate vinyl chloride gas and a small amount of by-products such as acetaldehyde. The acetylene conversion rate of the foreground converter is about 70%, the mixed gas at the outlet of the foreground converter contains 20-30% of unconverted acetylene gas, the mixed gas enters the background converter along with the crude vinyl chloride for continuous reaction, the unconverted acetylene gas in the gas at the outlet of the background converter is controlled to be below 3% after the reaction is finished, the reaction temperature does not need to be increased, and after passing through the background converter, the acetylene gas in the outlet of the background converter can be recovered. And the total conversion rate of acetylene reaches 99%.

Process for the hydrochlorination of alkenes, comprising the following steps: a)- preparing an organic solution A of a compound (I) comprising at least one alkene function by dissolving it potentially in an organic solvent; b)- mixing the solution A with a aqueous solution B comprising hydrochloric acid; c)- stirring the mixture comprising solution A and solution B at stirring speed of at least 500 rpm, and at a temperature in the range from -5 to 105°C for at least half an hour.

The invention relates to the technical field of chemical engineering, in particular to a mixed freezing dehydration system and method before vinyl chloride synthesis. The device comprises a hydrogen chloride primary cooler, a hydrogen chloride secondary cooler, a first molecular sieve dryer, a second molecular sieve dryer, an airflow cyclic regeneration device, an acid collecting tank, a mixer, a hydrogen chloride conveying pipeline and an acetylene conveying pipeline. Through combination of graded cooling and parallel molecular sieve deep drying, the water-containing volume fraction of mixed gas is stably controlled within 0.003%, the dehydration effect is remarkably improved, the follow-up catalyst activity and the vinyl chloride synthesis reaction efficiency are guaranteed, the parallel molecular sieve dryer can be automatically switched according to the saturation degree, and the process continuity is guaranteed.

The utility model provides a gas catalytic reactor which comprises a reaction tube body and a first sealing piece, one end of the reaction tube body is provided with a first opening, and the side wall of the reaction tube body extends to form a gas inlet tube and a gas outlet tube which only allow gas to flow. A gas reaction area filled with a catalyst and used for gas reaction is formed in the reaction tube body, and the first sealing piece is detachably connected with the first opening so as to seal the gas reaction area; a catalyst is directly placed in the reaction tube body, and the first openings are formed in the two ends of the reaction tube body; when the catalyst needs to be replaced, only the first sealing piece and the first opening need to be detached, the catalyst in the reaction tube body is poured out, then a new catalyst is put in, and finally the first sealing piece and the first opening are fixed. According to the utility model, the catalyst can be conveniently replaced, and the problem that the catalyst is inconvenient to replace is solved.