23results about "Preparation by oxygen reduction" patented technology

A method for producing a higher alcohol from a waste plastic feedstock is disclosed, comprising: (a) providing a hydrocarbon feed stream comprising a pyrolysis oil feed obtained from pyrolysis of plastic waste, wherein the pyrolysis oil comprises at least 20 wt % higher olefins with a carbon number in the range C5-C20, based on its total hydrocarbon content; (b) contacting the hydrocarbon feed stream with synthesis gas under hydroformylation conditions in the presence of a hydroformylation catalyst and recovering a hydroformylation product; (c) subjecting the hydroformylation product to hydrogenation and / or a distillation to recover a higher alcohol product.

This invention provides a neutral-electron-reversed carbene, its preparation method, and its applications, belonging to the fields of organic chemistry and organic catalysis. The neutral-electron-reversed carbene described in this invention has the structure shown in formula (I). This invention synthesizes the neutral-electron-reversed carbene in one step by reacting a diazo compound as a precursor with a rhodium complex, followed by nitrogen removal and COD (1,5-cyclooctadiene) removal processes. The reaction conditions of this invention are simple, and the yield is good. Stable separation of neutral-electron-reversed carbene is achieved for the first time.

A process for producing glycols from a carbohydrate source using a catalyst system, and which process can be carried out continuously in a reactor, and in which process a catalyst material is recovered from the reactor effluent. The reactor effluent is subjected to separation to obtain some valuable glycols, and one or more of the bottom streams comprising heavy polyols and some catalyst material containing one or more tungsten compounds is subjected to burning, and the burner is part of a boiler that can generate steam. Such steam may be used in the separation of one or more of the desired compounds.

The application discloses a method for preparing pentanediol by hydrogenolysis of furfuryl alcohol, which uses furfuryl alcohol as raw material, and generates 1,2-pentanediol and 1,5-pentanediol by hydrogenolysis of the furfuryl alcohol under the action of a catalyst; the catalyst comprises copper, calcium, barium and silicon. The process and the catalyst can obtain high furfuryl alcohol conversion rate and 1,2-pentanediol yield, different catalysts participate in different reactions, can effectively inhibit other side reactions, the 1,2-pentanediol yield is high, and the catalyst has long service life.

This invention relates to the field of chemical process treatment technology, and discloses a method and system for treating organic wastewater from ethanol dehydration to ethylene production. The invention first hydrogenates a mixed solution containing ethanol, diethyl ether, and acetaldehyde, converting acetaldehyde in the mixed solution into ethanol, effectively avoiding the impact of acetaldehyde accumulation on the dehydration catalyst. Then, the overhead gas from the stripping tower is collected to recover ethanol and diethyl ether from the aqueous phase, with recovery rates reaching over 99 wt%. This invention employs a "hydrogenation reaction + stripping" technology, effectively recovering and reusing ethanol and diethyl ether from the aqueous phase. It solves the problems of difficulty in separating the ternary azeotrope of diethyl ether, acetaldehyde, and water through distillation, acetaldehyde in the recovered product causing deactivation of the dehydration catalyst, and the high energy consumption caused by the need for condensation followed by vaporization of the recovered product.

A shell-and-tube type heat exchange reactor for performing a catalytic gas-phase partial oxidation reaction, comprising a shell-side heat exchange passage for circulating a heat transfer medium and a reaction passage including a plurality of reaction tubes, an inlet for introducing a reaction stream into the reaction passage, and an outlet from the reaction passage for recovering the discharge stream from the reaction tubes. The reaction tubes include a reactant preheating zone adjacent to the inlet and a reaction zone downstream of the reactant preheating zone, the reaction zone having a catalytically active wire matrix insert having a catalytically active noble metal on at least a part of its surface. This reactor reduces the need for frequent maintenance in the form of catalyst regeneration and / or replacement. The catalyst can be easily arranged in the reaction tubes and can be easily removed from the reaction tubes. Only the portion of the entire reaction stream that flows near the wall of the hot reaction tubes is heated. As a result, the portion of the reaction stream flowing through the center of the reaction tubes is not heated to the reaction temperature, and thus blind reactions of unstable starting materials are reduced or even avoided.

A process for separating a Cs or C6 alkanediol from a crude product stream comprising the Cs or C6 alkanediol, light contaminants and heavy contaminants comprising one or more of: a C 10 or C 12 linear ester, or a C 10 or C 12 cyclic acetal or ketal is disclosed. The process comprises feeding the crude product stream to a separation system comprising a first distillation zone, to which the crude product stream is fed and from which the heavy contaminants are removed in a heavies stream taken as a bottom stream, and a second distillation zone, in which the Cs or C6 alkanediol is separated from a reaction product, comprising one or more of: a Cs or C6 cyclic ester, or a Cs or C6 aldehyde, formed in the first distillation zone and from which the Cs or C6 alkanediol is withdrawn in a refined product stream.

The present invention provides a method for more easily decomposing a polyol or a polyol ester. A method for decomposing a polyol or a polyol ester according to the present invention is a decomposition method in which a substance to be decomposed containing at least one of a polyol and a polyol ester and a solid of a metal oxide or a metal hydroxide having a standard redox potential different from that of water are brought into contact with each other in specific reaction water, and in which the substance to be decomposed is heated to 100°C to 250°C inclusive in a state of being in contact with the solid in the specific reaction water.

The application discloses a method for preparing cinnamyl alcohol by hydrogenating cinnamyl aldehyde. The method comprises the following steps: in a reactor, under a non-active gas atmosphere, mixing isopropanol with cinnamyl aldehyde, and contacting the mixture with a catalyst to obtain cinnamyl alcohol by reaction; the catalyst is composed of a carrier and cobalt particles loaded on the surface of the carrier; the size of the cobalt particles is 2-30 nm, and the cobalt particles are highly dispersed; and the loading amount of the cobalt particles in the catalyst is 30-70 wt%. The biomass alginate with low price is used as a carbon source, and the preparation method is simple and easy to implement. The catalyst has the advantages of high Co loading amount, small Co particle size and high dispersion, and exhibits good catalytic activity and cinnamyl alcohol selectivity in the selective hydrogenation reaction of cinnamyl aldehyde.

The application relates to the field of catalyst material synthesis, and discloses a core-shell structure catalyst, a preparation method and application thereof, and a 1,3-propanediol synthesis method. The catalyst comprises a core, a sandwich layer and a shell. The core of the catalyst comprises a heat-resistant inorganic oxide and / or a molecular sieve, the sandwich layer comprises W oxide and Pt nanoparticles, and the shell comprises a mesoporous molecular sieve. The catalyst has high hydrothermal stability, and the selectivity of the product 1,3-propanediol in a catalytic reaction is high.

A method for recovering a co-catalyst that has been used in a process wherein a carbohydrate fraction is subjected to a catalytical conversion process to form a liquid composition of glycols is disclosed. The method comprises: - subjecting the carbohydrate fraction to the catalytical conversion process in the presence of the co-catalyst to form the liquid composition of glycols, - recovering a mixture feed, - combining the mixture feed with water such as to provide an aqueous mixture feed, - feeding the provided aqueous mixture feed into a combustion chamber, wherein the aqueous mixture feed is subjected to a burning treatment, and - recovering the co-catalyst from the combustion chamber.

A method comprising producing a reaction mixture comprising a sugar, a nickel-rhenium catalyst, a tungsten co-catalyst and a solvent, wherein the catalyst comprises a nickel-rhenium alloy supported

In a method for decomposing a polyol or a polyol ester according to the present invention, a substance to be decomposed containing at least one of a polyol and a polyol ester is brought into contact with a solid of a metal oxide or a metal hydroxide having a standard oxidation-reduction potential different from that of water in predetermined reaction water.

In a method for decomposing a polyol or a polyol ester according to the present invention, a substance to be decomposed containing at least one of a polyol and a polyol ester is brought into contact with a solid of a metal oxide or a metal hydroxide having a standard oxidation-reduction potential different from that of water in predetermined reaction water.

Integrated processes are disclosed for the catalytic conversion of carbohydrate to ethylene glycol and / or propylene glycol using a homogeneous, tungsten-containing retro-aldol catalyst. In these processes, the carbohydrate is subjected to retro-aldol conversion and hydrogenation to provide a reaction product containing ethylene glycol and / or propylene glycol, other reaction process including organic acids, itols and tungsten species. Ethylene glycol and propylene glycol are separated from the reaction product for purification, and at least a portion of the remaining fraction is subjected to ion exclusion chromatography to provide an eluant containing tungsten species and a subsequent eluant containing organic acids and a substantially reduced concentration of tungsten species. At least a portion of the eluant containing tungsten species can be recycled for reuse directly or with intervening unit operations to enhance the catalytic activity of the tungsten species. The organic-containing fraction can be subjected to one or more unit operations to provide salable products or subjected to selective hydrogenolysis to lower glycols.

Disclosed is a method for producing higher alcohols from a waste plastic feedstock, the method comprising the steps of: (a) providing a hydrocarbon feedstream comprising a pyrolysis oil feed obtained from the pyrolysis of plastic waste, the pyrolysis oil comprising at least 20 wt. % higher olefins having carbon numbers in the range of C5 to C20, based on the total hydrocarbon content of the pyrolysis oil; (b) contacting the hydrocarbon feedstream with a synthesis gas under hydroformylation conditions in the presence of a hydroformylation catalyst and recovering a hydroformylation product; and (c) subjecting the hydroformylation product to hydrogenation and / or distillation to recover a higher alcohol product.

This invention provides a catalyst for preparing methanol from waste liquid generated during ethylene glycol production from syngas, along with its preparation method and application, belonging to the field of resource comprehensive utilization technology. This invention uses silica as a support to improve the dispersibility of the copper-based catalyst and auxiliary metals in the catalyst, thereby enhancing the catalytic effect. This invention uses a copper-based catalyst, CuZr₂O₃. x Using one or more of Fe, Ce, and K as the main catalyst, the interaction between the auxiliary metal and the copper-based catalyst can be utilized to improve the catalytic effect, thereby enabling methyl formate, methyl acetal, and dimethyl carbonate in the waste liquid from syngas-to-ethylene glycol production to participate in the reaction and form methanol. The results of the examples show that after treating the waste liquid from syngas-to-ethylene glycol production using the catalyst provided by this invention, the methanol content in the liquid product is higher than 92%, achieving resource utilization of the waste liquid from syngas-to-ethylene glycol production.

The invention provides a start-up method for a process for the preparation of glycols from a starting material comprising one or more saccharides in the presence of hydrogen and a catalyst system comprising one or more retro-aldol catalysts comprising tungsten and one or more catalytic species suitable for hydrogenation in a reactor, said method comprising introducing the one or more retro-aldol catalysts to the reactor whilst also in the presence of one or more agents suitable to suppress tungsten precipitation.

Integrated processes are disclosed for the catalytic conversion of carbohydrate to ethylene glycol and / or propylene glycol using a homogeneous, tungsten-containing retro-aldol catalyst. In these processes, the carbohydrate is subjected to retro-aldol conversion and hydrogenation to provide a reaction product containing ethylene glycol and / or propylene glycol, other reaction process including organic acids, itols and tungsten species. Ethylene glycol and propylene glycol are separated from the reaction product for purification, and at least a portion of the remaining fraction is subjected to ion exclusion chromatography to provide an eluant containing tungsten species and a subsequent eluant containing organic acids and a substantially reduced concentration of tungsten species. At least a portion of the eluant containing tungsten species can be recycled for reuse directly or with intervening unit operations to enhance the catalytic activity of the tungsten species. The organic-containing fraction can be subjected to one or more unit operations to provide salable products or subjected to selective hydrogenolysis to lower glycols.

A system and method for the production of formaldehyde from electrocatalytically generated formic acid can include using a highly energy efficient electro-catalytic conversion step for producing aqueous formic acid, combined with a thermocatalytic reaction step to produce formaldehyde.