108results about "Preparation by halogen halide addition" patented technology

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.

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.

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 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 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 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.

The invention discloses a copper-based catalyst and preparation and application thereof, the copper-based catalyst comprises a CeO2 modified activated carbon carrier and active components loaded on the CeO2 modified activated carbon carrier, and the active components comprise CuCl2, SnCl4 and CsCl; according to the copper-based catalyst, the cerium oxide modified activated carbon is adopted as the carrier, SnCl4 and CsCl are introduced into the active components to cooperate with CuCl2, the activity and stability of the catalyst are effectively improved, and on the premise that the catalytic performance is guaranteed, the loading amount of copper is remarkably reduced, use of heavy metal is reduced, and the environmental risk is reduced.

A process for the production of vinyl chloride monomer (VCM) from acetylene and HCl in the presence of a hydrochlorination catalyst. The process involves a specific arrangement between the lights colu

According to the method, polyethyleneimine is used as a modifier, corncob is used as a biomass carbon source, potassium bicarbonate is used as an opening agent, water is used as a solvent, and the nitrogen-doped biomass charcoal material is obtained through calcination under inert gas and used for acetylene hydrochlorination reaction. The catalyst has high activity and chloroethylene selectivity in a reaction for preparing chloroethylene through acetylene hydrochlorination in a fixed bed, and has great industrial application value. Under the conditions that the reaction mass space velocity is 2.0 ml / g.min, V (C2H2) / V (HCl) is 1: 1.05 and the reaction temperature is 220 DEG C, the acetylene conversion rate can reach 84.7%, and the vinyl chloride selectivity is greater than 99%. Meanwhile, compared with the activity of a non-nitrogen-doped biomass charcoal material and the activity of nitrogen-doped commercial activated carbon, the activity of the nitrogen-doped biomass charcoal material is improved by 38.2% and 30%, and a novel preparation method of the nitrogen-doped biomass charcoal material is provided for acetylene hydrochlorination reaction.

The application provides an ethylene oxychlorination device system and method for preparing dichloroethane, the device system comprising a reaction device, a quenching device and a gas-liquid separation device connected in a loop; a catalyst is arranged in the reaction device; a plurality of heat exchange devices are arranged in the reaction device from bottom to top; a spraying device and a gas distribution device are arranged between adjacent heat exchange devices; and a plurality of gas-solid separation devices are arranged on the inner top of the reaction device. In the application, the fluidized bed reaction device for oxychlorination is precisely controlled in different bed layer reaction temperatures through staged heat exchange and liquid spraying of dichloroethane; the bed layer catalyst particle size distribution is improved by optimizing the bed layer position of catalyst recovery in the gas-solid separation device; and the oxygen content in different bed layers is regulated by optimizing the staged addition of oxygen, so that the ethylene ablation rate is low, the hydrogen chloride conversion rate is high, and the crude dichloroethane purity is high.

The invention discloses a method for accumulating activated carbon on an upper tube plate of a converter and enabling gas to uniformly enter a tube nest of the converter in calcium carbide method polyvinyl chloride production, and belongs to the technical field of polyvinyl chloride production. The method comprises the following steps: placing an activated carbon check ring on the upper tube plate of the converter, and laying glass wool cloth at the bottom end in the activated carbon check ring; a circular-truncated-cone-shaped activated carbon layer is stacked on the glass wool cloth; gas such as acetylene gas and hydrogen chloride gas or gas such as acetylene gas, hydrogen chloride gas and vinyl chloride enters an upper sealing head of the converter through a gas inlet of the converter; due to the fact that the thickness of the activated carbon layer is consistent, the gas amount of acetylene gas, hydrogen chloride gas and the like or acetylene gas, hydrogen chloride gas, vinyl chloride and the like entering each tube nest of the converter from the gas inlet in the upper portion of the converter is uniform, and the situation that the gas inlet amount of some tube nests is large, and the gas inlet amount of some tube nests is small is avoided.

The specification describes a process for producing vinyl chloride monomer (VCM) from acetylene. Purification of a reactor product stream comprising VCM, acetylene and HCl is achieved in sequence of steps involving cooling, compression, condensation and further separation in a lights column. The condensation stages produce a condensation overheads stream and a condensation bottoms stream. The condensation overheads stream is sent to a vent recovery section for further recovery of VCM from incondensables. The inclusion of a vent recovery section is particularly effective in situations where the degree of conversion in the reactor is ≤ 95%, which if often the case when using mercury-free catalysts.

This invention discloses a method for preparing and using a highly dispersed Ru catalyst for the fixed-bed acetylene process to prepare vinyl chloride. The method employs a "confined coordination + pyrolysis anchoring" strategy, utilizing the spatial confinement of the ruthenium salt precursor within the polymer three-dimensional network and the coordination effect of the polymer monomers on Ru species to achieve uniform and stable dispersion of the ruthenium salt in the polymer system. Based on this, the aforementioned ruthenium salt-containing polymer system is pyrolyzed at high temperature, causing the Ru species to be anchored in situ onto a carbon substrate by N atoms, achieving stable and highly dispersed active metal Ru. Subsequently, the addition of phosphazene compounds and ionic liquids (especially morpholine-based ionic liquids) as auxiliaries further enhances the valence stability of the Ru species and effectively inhibits the formation of reaction carbon deposits, thereby significantly improving the activity and long-term reaction stability of the Ru catalyst.

The present invention, as disclosed herein, relates to compounds, combinations, kits, and methods of using them for use in bioorthogonal release reactions. In particular, the compounds, combinations, and kits of the present invention can be used to achieve rapid and efficient click release. The applications of the compounds, combinations, and kits of the present invention include both in vitro and in vivo applications.

The present application provides a non-noble metal composite catalyst, a preparation method and application thereof. Specifically, the present application provides a non-noble metal composite catalyst, which is prepared by impregnating a catalyst carrier in a metal salt solution, a cocatalytic metal salt solution (including an alkali metal salt solution or a rare earth metal salt solution), and a coordination compound solution.

In a method for acetylene hydrochlorination to vinyl chloride catalyzed by ultra-low content aurum-based material, a nitrogen-modified activated carbon support is obtained by using 1,10-phenanthroline as a modifier. A trace amount of aurum is used as a main active component and an organic solvent with a low polarity and a low boiling point, isopropanol, is used as a solvent. An ultra-low content of aurum-based catalyst with the aurum loading amount of 0.01 wt % using the above nitrogen-modified activated carbon as a support is prepared by improving the synthesis procedure, and the efficiency of the catalyst is significantly improved. The catalyst has high activity and vinyl chloride selectivity for acetylene hydrochlorination to vinyl chloride, which is low cost, no mercury pollution, simple in preparation process and expansibility, and has great industrial application value.

The application provides a gold-based catalyst for preparing vinyl chloride by an acetylene hydrochlorination method and a preparation and use method thereof. The catalyst is mainly used for synthesizing vinyl chloride from acetylene and hydrogen chloride in a normal-pressure fixed bed reactor and belongs to the field of chemical catalysis. According to the principle of isoelectric point and electrostatic adsorption, imidazole is uniformly grown to stabilize the iodine-containing ligand and the active component Au to form two kinds of stable gold iodine complexes with different valence states by taking activated carbon as a carrier and gold salt as an active component, so that a new type of high-efficiency acetylene hydrochlorination mercury-free catalyst is prepared, the activity and stability of the catalyst are improved, and the carbon deposition amount is reduced. The method has high feasibility, high catalyst conversion rate and good stability.