350results about "Preparation by hydrogen halide split-off" patented technology

The invention belongs to the technical field of catalyst preparation, and particularly relates to a pentachloropropane dehydrochlorination catalyst and a preparation process of tetrachloropropene. The preparation process of the catalyst comprises the following steps: (1) modifying gamma-aluminum oxide powder by adopting an epoxy group-containing silane coupling agent to obtain activated gamma-aluminum oxide powder; (2) dispersing the activated gamma-aluminum oxide powder and polyamino POSS in a solvent, and stirring for reaction to obtain modified gamma-aluminum oxide powder; and (3) preparing trivalent metal salt-loaded modified gamma-alumina powder, and drying to obtain the pentachloropropane dehydrochlorination catalyst. The epoxy group-containing silane coupling agent not only improves the dispersion performance of alumina, but also plays a medium role, so that POSS is attached to the surface of alumina powder, and the stability of the catalyst is improved. Amino groups on POSS are used for complexing trivalent metal ions, and POSS micromolecules can also serve as a transmission track of a substrate, so that the catalytic activity is improved.

The invention relates to a process for the preparation of a halogenated 1,3-butadiene by dehydrohalogenation of a halogenated 1-butene. Preferably, the process is for the preparation of 2-chloro-1,3-butadiene (CP) from 3,4-dichloro-1-butene (3,4-DBN), or for the preparation of 2,3-dichloro-1,3-butadiene (DCB) from 2,3,4-trichloro-1-butene (TCB). The dehydrohalogenation is performed in the presence of an organic base that forms a salt with eliminated hydrohalogenic acid and provides a low melting halide salt, preferably an organic salt melting below 100 °C, that is an ionic liquid. Preferably, halogenated 1,3-butadiene is separated from the reaction mixture by in-situ distillation. Organic base is recovered from the low melting organic salt by e.g. heating and release of hydrohalogenic acid. After purification, recovered organic base is recycled into the process.

The invention provides a method for preparing p-chloromethyl styrene, which comprises the following steps: (1) in the presence of a catalyst and an assistant, carrying out reaction on paraformaldehyde and hydrogen chloride to obtain a chloromethylation reagent; (2) reacting beta-halogenated ethyl benzene with the chloromethylation reagent obtained in the step (1) to obtain chloromethyl halogenated ethyl benzene; (3) adding an extracting agent into the chloromethyl halogenated ethylbenzene reaction liquid obtained in the step (2) for extraction to obtain an oil layer containing chloromethyl halogenated ethylbenzene and a water-containing acid layer, and crystallizing the oil layer to obtain purified p-chloromethyl halogenated ethylbenzene; and (4) in the presence of a solvent, carrying out elimination reaction on the purified p-chloromethyl halogenated ethyl benzene and alkali to obtain p-chloromethyl styrene.

The invention relates to the technical field of catalytic synthesis, in particular to a chloromethylation catalyst, a preparation method of the chloromethylation catalyst and a method for preparing high-purity ortho-position, meta-position and para-position chloromethyl styrene through the chloromethylation catalyst, and the chloromethylation catalyst is prepared by loading sulfonic acid compounds and (or) pyridine compounds and (or) copper salt on a molecular sieve. The method can improve the localization selectivity of chloromethylation. The method for preparing high-purity ortho-position, meta-position and para-position chloromethyl styrene comprises the following steps of: reacting beta-bromophenylethane, paraformaldehyde and lewis acid in the presence of the chloromethylation catalyst to generate chloromethyl beta-bromophenylethane, and then performing elimination reaction under an alkaline condition to generate a chloromethyl styrene crude product; the high-purity ortho-position, meta-position and para-position chloromethyl styrene is obtained after the crude product is rectified, the brand-new catalyst is adopted in the method, the reaction selectivity is enhanced, the process is simple, and industrial production is facilitated.

A method is provided for manufacturing vinyl chloride monomer (VCM), the method comprises subjecting ethylene dichloride (EDC) to thermal cracking to yield a VCM-containing gaseous product, in which method an amount of thermal energy required to heat a stream of EDC-containing process fluid to temperature(s), at which cracking reactions occur, is produced and transferred to said EDC-containing process fluid using a rotary apparatus (100). A VCM production unit and use of the rotary apparatus in production of vinyl chloride monomer from EDC through therma cracking, are further provided.

The invention provides a reactor comprising a reaction chamber having a catalytic surface in contact with reactants in said chamber; and a source for passing electrical current through said catalytic surface. The reactor can be used for dehydrohalogentation reactions, such as dehydrochlorination of HCFC-244bb to HFO-1234yf, and for reactions where zero valent metals are employed for catalysis. The invention further provides a process to prepare HFO-1234yf from HCFC-244bb using an electrically heated reaction chamber.

Disclosed herein are fluoroolefin refrigerant compositions, methods of producing the same, methods and systems using the same, and systems containing the Z-HFO-1234ze refrigerant compositions. The inventive compositions are useful as refrigerants in air conditioning, refrigeration systems, such as chillers, and heat pumps.

The production of HFO-1132, and in particular HFO-1132 E, may be produced from 1, 1, 2-trichloro-1, 2, 2-trifluoroethane (CFC-113), and the production of HFO-1132, and in particular HFO-1132 E, may be produced from 1, 1, 2-trichloro-1, 2, 2- In a first step, 1, 1, 2-trifluoroethane (HFC-143) is produced by hydrogenating 1, 1, 2-trichloro-1, 2, 2-trifluoroethane (CFC-113) by reacting with hydrogen in the presence of a catalyst to produce 1, 1, 2-trifluoroethane (HFC-143). The 1, 1, 2-trifluoroethane (HFC-143) may then be dehydrofluorinated in the presence of a catalyst to produce trans-1, 2-difluoroethylene (HFO-1132E) and / or cis-1, 2-difluoroethylene (HFO-1132Z). The cis-1, 2-difluoroethylene (HFO-1132Z) may then be isomerized to produce the trans-1, 2-difluoroethylene (HFO-1132E), and then the cis-1, 2-difluoroethylene (HFO-1132Z) may be isomerized to produce the cis-1, 2

A method for reducing 1,1,1,2,2-pentafiuoropropane (HFC-245cb) in a trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E)) manufacturing process including catalyst conditioning, temperature reduction, and contact time reduction. The method includes dehydrofluorinating 1,1,1,3,3-pentafluoropropane (HFC-245fa) with a catalyst mixture to produce a product mixture with HFO-1234ze(E) and HFC-245cb, and either incorporating a conditioned catalyst, using a lower temperature for the dehydrofluorination, or reducing the contact time for the dehydrofluorination to reduce the formation of HFC-245cb.

The present invention relates to an electrically heated furnace, particularly a furnace for chemical reactions, and more particularly, in one embodiment, provides an electrically heated furnace comprising: a. a furnace chamber including: i. one or more process tubes extending through the furnace chamber; ii. a plurality of electrically powered heating means disposed within the furnace chamber for heating the one or more process tubes; iii. one or more gas inlets; and iv. one or more gas outlets; the electrically heated furnace further comprising: b. an external recirculation loop connecting the one or more gas outlets of the furnace chamber to one or more gas inlets of the furnace chamber such that gas exiting the one or more gas outlets of the furnace chamber flows to the one or more gas inlets and is recirculated back to the furnace chamber; and c. at least one gas analyzer or detector and / or at least one pressure monitor for pressure measurement provided on the external recirculation loop.

The present invention provides a method for the co-production of 1,1-difluoroethane and vinyl chloride, including: (a) vaporizing dichloroethane and hydrogen fluoride, and delivering the vaporized dichloroethane and hydrogen fluoride into a reactor for a catalytic reaction under the action of a catalyst to obtain a reaction product; (b) delivering the reaction product into a first rectifying tower for separation to obtain an overhead product from the first rectifying tower and a bottom product from the first rectifying tower; (c) delivering the overhead product from the first rectifying tower into a second rectifying tower for separation to obtain hydrogen chloride and a bottom product from the second rectifying tower; (d) delivering the bottom product from the second rectifying tower into a purifying tower for purification to obtain an overhead product from the purifying tower; (e) simultaneously delivering the overhead product from the purifying tower and a saturated organic solvent into a third rectifying tower for separation to obtain a 1,1-difluoroethane product and a bottom product from the third rectifying tower; and (f) delivering the bottom product from the third rectifying tower into a fourth rectifying tower for separation to obtain a vinyl chloride product and a bottom stream from the fourth rectifying tower. The present invention has the advantages of simple process, high conversion rate, and good product quality.

The invention relates to bio-based vinylidene difluoride. The invention also relates to processes for preparing bio-based vinylidene difluoride from various renewable raw materials. The invention further relates to vinylidene difluoride homopolymers obtained by polymerization of said monomer, as well as copolymers obtained by copolymerization of said monomer with one or more compatible co-monomers. Finally, the invention relates to the use of said homopolymers or copolymers in applications such as chemical engineering or electronics, particularly consumer electronic devices.

The invention discloses a method for preparing halogenated fluorine-containing olefin with high yield as well as a product and application of the halogenated fluorine-containing olefin, dihalogenated perfluoroethane (ICF2CF2I or BrCF2CF2Br) and ethylene are taken as raw materials, under the action of a peroxide initiator TAPP (tert-amyl peroxypivalate, the addition amount of which is 0.2%-0.3% of the weight of the perfluorinated halogenated ethane), the ethylene is continuously introduced to maintain the reaction pressure of 0-5 kg, and the halogenated fluorine-containing olefin with high yield is prepared. Carrying out addition reaction to generate a dihalogenated fluorine-containing alkane intermediate; and heating toluene and sodium hydroxide / potassium hydroxide to 60-80 DEG C in a three-neck flask, superposing the intermediate to carry out elimination reaction, and continuously collecting the generated olefin through a distillation head to finally obtain ICF2CF2CH = CH2 or BrCF2CF2CH = CH2. The method is strong in process controllability, high in ethylene utilization rate and high in product separation efficiency, and adapts to iodination and bromination double-system production.

The application discloses a method for preparing 1,2-difluoroethylene from 2-chloro-1,1-difluoroethane resource utilization, and the method comprises the following steps: under the action of an M-N / Y catalyst, 2-chloro-1,1-difluoroethane is subjected to a gas phase dehydrochlorination reaction to obtain 1,2-difluoroethylene, wherein M is an active component, is a fluoride and / or chloride of at least one of K, Cs, Mg, Sr or Ba; N is a metal additive, is at least one of Ru, Rh, Pd, La, Ce or Pr; and Y is a carrier, is selected from activated carbon, graphene or metal fluoride. The preparation method has the advantages of mild reaction conditions, high selectivity of target products and the like.

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 provides a fluorination catalyst composition, a preparation method and application thereof, and a method for catalyzing 1, 1, 1, 3, 3-pentachloropropane to generate E-1-chloro-3, 3, 3-trifluoropropene, and belongs to the field of materials. The fluorination catalyst composition comprises a main catalyst and a third metal element loaded on the main catalyst, wherein the main catalyst is biomass charcoal simultaneously modified by a first metal element and a second metal element; wherein the first metal element comprises at least one of rare earth metal elements; the second metal element comprises at least one of Zr, Nb, Mo, V, Fe, Mn, Ti, Hf, Ga, In and Sn; the third metal element comprises at least one of Mg, Ca, Ba and Sr. The fluorination catalyst composition provided by the invention can efficiently catalyze 1, 1, 1, 3, 3-pentachloropropane to generate a gas phase fluorination reaction to generate E-1-chloro-3, 3, 3-trifluoropropene, has the advantages of high conversion rate, strong selectivity, long service life and the like, and is suitable for wide application.

Disclosed herein are fluoroolefin compositions, methods of producing the same, methods and systems using the same, and systems containing the HFO-1234ze compositions. The inventive compositions are useful as refrigerants in air conditioning and refrigeration systems, and also as blowing agents.

A method for conversion of a composition containing HCFO-1233zd(Z) and HCFC-244fa to form HCFO-1233zd(E) by reacting a mixture including HCFO-1233zd(Z) and HCFC-244fa in a vapor phase in the presence of a catalyst to simultaneously isomerize HCFO-1233zd(Z) to form HCFO-1233zd(E) and dehydrohalogenate HCFC-244fa to form HCFO-1233zd(E). The catalyst may be a chromium-based catalyst such as chromium trifluoride, chromium oxyfluoride, or chromium oxide, for example.

An azeotrope or azeotrope-like composition consists essentially of an effective amount of 1-chloro-1, 1-difluoroethane (HCFC-142b) and 1, 1, 2-trifluoroethane (HFC-143), and a method for producing the azeotrope or azeotrope-like composition. Also disclosed are methods for separating azeotrope or azeotrope-like compositions and / or utilizing the same in extraction and pressure swing distillation in conjunction with methods of making 1, 1, 2-trifluoroethane (HFC-143).

The invention discloses a preparation process of an R-1234yf refrigerant based on a heterogeneous catalyst, and relates to the field of preparation of refrigerants. According to the method, tetrafluoroethylene and trichloromonofluoromethane are subjected to a reaction through a liquid phase reaction to generate an intermediate product CCl3CF2CF3 (CFC-215cb), then the CFC-215cb is subjected to a catalytic hydrodechlorination reaction to obtain CH3CF2CF3, and then the CH3CF2CF3 is subjected to a catalytic elimination reaction to generate the target product R-1234yf. According to the method, the self-developed catalyst is used as a liquid phase reaction catalyst, Pd / Pd-AlF3 is used as a hydrogenation catalyst, and AlF3, Cr2O3 or activated carbon is used as an elimination catalyst, so that efficient and environment-friendly R-1234yf preparation is realized under mild conditions, and the method has the advantages of high reaction selectivity, high yield and few byproducts.

Minimum-boiling, heterogeneous azeotropic and azeotrope-like compositions including 1,1,2,2,3-pentachloropropane (HCC-240aa) and hydrogen fluoride (HF), as well as methods for using these azeotropic or azeotrope-like compositions in the production of trifluorochloropropenes.

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 for co-production of 2,3,3,3-tetrafluoropropene and 1-chloro-2,3,3,3-tetrafluoropropene, comprising: A1. a telomerization step: preparing 3-chloro-1,1,1,2-tetrafluoropropane through pressurized telomerization reaction of monofluoromonochloromethane and trifluoroethylene in the presence of a telomerization catalyst; the telomerization catalyst is a Lewis acid catalyst or a mixed catalyst of a Lewis acid catalyst and dichloromethane; A2. a removal step: 3-chloro-1,1,1,2-tetrafluoropropane simultaneously undergoes dehydrochlorination and dehydrogenation reactions in the presence of an activated carbon-supported noble metal catalyst to obtain 2,3,3,3-tetrafluoropropene and 1-chloro-2,3,3,3-tetrafluoropropene; the activated carbon-supported noble metal catalyst is at least one of Pd / AC and Pt / AC. The present application has the advantages of simple process, mild reaction conditions, high yield of target product, etc.

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.