230results about "Preparation by oxygen reduction" patented technology

The invention provides a catalyst for preparing 1, 2-pentanediol from furfuryl alcohol as well as a preparation method and application of the catalyst. The catalyst comprises a carrier and active components loaded on the carrier, the carrier comprises magnesium oxide and aluminum oxide, and the active components comprise a main active component and an auxiliary active component; the main active component comprises platinum, and the auxiliary active component comprises any one or a combination of at least two of yttrium, zirconium or manganese. The catalyst provided by the invention has the advantages of high stability, high activity, strong reusability and the like, the preparation method is simple, high-selectivity and high-yield 1, 2-pentanediol can be prepared from furfuryl alcohol as a raw material under mild conditions, the reaction time is short, the dosage of the catalyst is small, and the catalyst has extremely high application value.

The invention discloses a hydrogenation catalyst, a preparation method and application of the hydrogenation catalyst in preparation of 1, 2-pentanediol through furfuryl alcohol hydrogenation, the catalyst comprises a zirconium dioxide carrier (ZrO2) and loaded metal active components; the zirconium dioxide carrier has a monoclinic phase and tetragonal phase blended crystal structure, and based on the total mass of the zirconium dioxide carrier, the content of zirconium dioxide existing in a tetragonal phase form is 20-40%. The catalyst is simple in production process and suitable for large-scale batch production, the obtained catalyst can be used for the hydrogenation reaction of furfuryl alcohol and shows excellent catalytic performance, the reaction process is simple, the reaction condition is mild, the selectivity of 1, 2-pentanediol is high, and subsequent separation becomes simple.

Disclosed is the use of a dividing-wall column in a process for co-producing propylene oxide and styrene monomer. Feed streams to a dividing-wall column comprise a bottoms product produced in recovering crude propylene oxide from an epoxidation reaction product, a hydrogenated byproduct styrene monomer production, and a light fraction of a bottoms product withdrawn from the dividing-wall column. Products from the dividing-wall column comprise an overhead product comprising ethylbenzene for recycle to an oxidation zone, an intermediate product comprising methylbenzyl alcohol and acetophenone as feed to a dehydration zone to produce styrene monomer, and a bottoms product comprising methylbenzyl alcohol and heavy materials.

The present application relates to a kind of preparation method of vicinal diol compound, which comprises the following steps: in non-aqueous solvent, formula (I) compound and reducing agent are reacted under light condition, to obtain the vicinal diol compound shown in formula (II);The reducing agent is formic acid or formate;The wavelength of the light is less than 390nm;Its reaction formula is as follows.The preparation method of the present application does not need transition metal catalyst, also does not need other special catalyst and special additive, and the aldehyde ketone substrate can be reacted with formic acid or formate in solvent by specific wavelength of light, to obtain corresponding vicinal diol compound with high yield, its reaction condition is mild, has wide substrate applicability, and green and environmental protection, simple and practical operation method, provides an effective synthesis strategy for the synthesis of shikimic alcohol compound.

The present invention relates to a polymer comprising units derived from a carboxylic acid comprising at least two carboxylic groups or its anhydride and from an alcohol comprising at least two OH-groups, wherein the alcohol comprising at least two OH-groups is a bi-cyclo-aliphatic diol of formula (IX) with R1 = ethyl, -CH2-CH2-CH2OH, or -CH(-CH3)-CH2OH, and R2 = H or -CH2OH, with the proviso that R2 is not H when R1 = ethyl, to a process for preparing a polymer by reacting at least one carboxylic acid comprising at least two carboxylic groups or its anhydride or ester and at least one alcohol comprising at least two OH-groups, wherein the alcohol comprising at least two OH-groups used is a bi-cyclo-aliphatic diol of formula (IX), and to the use of a polymer according to the invention or obtained by a process according to the invention as or for the production of lacquers, coatings or adhesives, preferably tube or can coatings, metal decorating enamels, heat sealing lacquers, hot laminating adhesives, or primers.

A method for producing mono-ethylene glycol (MEG) from a wood-based raw material, and wherein method comprises: i) providing a wood-based feedstock originating from the wood-based raw material and comprising wood chips, wherein at most 5 weight-% of the wood chips in the wood-based feedstock are overthick wood chips as specified by SCAN-CM 40:01, and subjecting the wood-based feedstock to at least one pretreatment to form a liquid fraction and a fraction comprising solid cellulose particles; ii) subjecting the fraction comprising solid cellulose particles to enzymatic hydrolysis to form a lignin fraction and a carbohydrate fraction; iii) subjecting the carbohydrate fraction to catalytical conversion to form a liquid composition of glycols; and iv) recovering mono-ethylene glycol from the liquid composition of glycols. Further is disclosed a corresponding arrangement and mono-ethylene glycol obtainable by the method.

The present invention provides a method for preparing 1,2-pentanediol from D-xylose in one pot. In this method, water is used as the reaction solvent, formic acid is used as the dehydration catalyst, and Pt / mesoporous nitrogen-doped carbon spheres are used as the hydrogenation catalyst. In a high-pressure reactor under a hydrogen atmosphere, 1,2-pentanediol is prepared from D-xylose in one pot. The preparation process of the present invention is simple, the raw materials are easily available, the reaction process is environmentally friendly and pollution-free, and the catalytic system is relatively simple. The raw material conversion rate can reach 100%, and the highest yield of 1,2-pentanediol can reach 40.59%. Moreover, the Pt / mesoporous nitrogen-doped carbon spheres have good stability and can be recycled by simple filtration and drying, which can save resources and reduce costs, and have important application value and are suitable for industrial production and application.

The present invention relates to a method for preparing a mixture containing cyclohexanol and cyclohexanone, comprising the step of hydrogenating cyclohexyl hydroperoxide in cyclohexane in the presence of a Raney nickel catalyst to obtain cyclohexanol and cyclohexanone.

Process for the preparation of ethylene glycol and / or propylene glycol by reacting a carbohydrate source with hydrogen in the presence of tungsten compound and a heterogeneous catalyst comprising a metal of groups 8, 9 and 10 on a support which heterogeneous catalyst has (a) an active metal surface area (AMSA) of from 4.0 to 8.0 m2 / g, as determined by hydrogen chemisorption, and (b) a ratio of the percentage of the adsorbed ammonia that is desorbed at a temperature range of 100 °C to the temperature of the first peak (% DA100-FP) to the AMSA (% DA100-FP / AMSA) of from 0.35 to 8.0, and (c) 7.18×AMSA−%DA100−FPAMSA is at least 26.38, and process of selecting such heterogeneous catalyst.

A chemical synthesis apparatus comprising: one or more reactors configured to produce a process stream comprising at least one chemical product from one or more reactants; a feed preparation system configured to prepare one or more feed streams comprising one or more of one or more reactants to be introduced into one or more reactors; and / or a product purification system configured to separate at least one chemical product from reaction byproducts, unreacted reactants, or a combination thereof within the process stream, wherein the chemical synthesis apparatus is configured such that a majority of the net energy required for heating, cooling, compression, or a combination thereof used via one or more reactors, feed preparation systems, product purification systems, or a combination thereof is provided by a non-carbon-based energy source, renewable energy source, and / or electrical power.

Processes for conversion of propylene polyol feed into useful petrochemical products, including olefin monomers, are described. Such processes comprise: adding a feed stream comprising one or more propylene polyols, hydrogen, and optionally water, to a catalytic conversion reaction zone in the presence of a first solid acid catalyst component and a hydrogenation catalyst component and reacting at a pressure and temperature sufficient to form a first product stream comprising a propanol component. The first product stream can be added to a dehydration reaction zone in the presence of a dehydration catalyst and reacted at a pressure and temperature sufficient to form a second product stream comprising propylene.

An efficient one step, one pot process of synthesis of value-added products such as diols, monools and / or acids, preferably 1,2-PG from sugars / polysachhrides is disclosed. The process is catalyzed by a bimetallic catalyst supported on alumina and the catalyst is recyclable. The process of synthesis of the catalyst is a simple process and it converts a high % of the substrates to the desired polyols under mild conditions.

The present invention provides a production method for recycling carbide slag to produce neopentyl glycol and calcium formate. The method uses carbide slag slurry containing calcium hydroxide solution, which is made from carbide slag produced by the acetylene method for producing PVC, as a catalyst and adds it to the condensation reaction for preparing neopentyl glycol using isobutyraldehyde and formaldehyde as raw materials. The present invention uses a large amount of solid waste carbide slag containing calcium hydroxide produced by the acetylene method for producing PVC as a catalyst for the disproportionation method, solving the problem of difficult utilization of carbide slag. At the same time, it solves the problem that when directly adding calcium hydroxide solution as a catalyst, calcium formate wall sticking is likely to occur. The solid formed by calcium formate wall sticking has the characteristics of strong adhesion and compactness, which is difficult to clean. The cleaning cost is high and it is easy to cause equipment blockage and shutdown. In severe cases, the equipment cannot be cleaned and is abandoned. In addition, by adding a crystal form finishing agent to the condensation reaction solution, the crystallization mode of calcium formate and the size of crystallization particles can be changed, improving the purity and quality of calcium formate and neopentyl glycol.

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.

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

A method of treating waste water of neopentyl glycol is provided, comprising: recovering waste water containing a catalyst from one or more of a hydroxy aldehyde purification process, a neopentyl glycol purification process, and an extractant recovery process, and supplying the waste water to a volatile organic compound separation column; obtaining an upper effluent stream containing the catalyst and a lower effluent stream containing the waste water from which the catalyst has been removed in the volatile organic compound separation column; and supplying the lower effluent stream to a waste water treatment system to treat the waste water.

A method for shutting-down a process wherein a carbohydrate source is converted into one or more alkylene glycols. In particular the invention relates to a method for shutting- down such a process for the conversion of a saccharide into ethylene glycol. The procedure according to the invention aims to minimize foam formation occurring otherwise.

The present disclosure describes compositions comprising substantially pure ribitol, pharmaceutical compositions of ribitol, and methods of making ribitol. The methods may include combining a reducing agent (e.g., borohydride) and ribose (e.g. D-ribose), optionally with stirring, to form a first reaction mixture; and contacting the first reaction mixture and an acidic quenching agent, optionally with stirring, to form a second reaction mixture, thereby forming ribitol.

In alternative embodiments, provided are processes for producing propylene glycol from glycerol derived from manufacturing biodiesel. Processes as provided herein can reduce color and / or odor from a converted propylene glycol by removing impurities and by-products produced during the glycerol hydrogenation conversion process. In alternative embodiments, provided are improved process for producing propylene glycol from glycerol at high selectivity and conversion and reduced operating costs.

The present invention relates to halogenated alkenylalkoxymethyl ether compounds of the following general formula (1): R 1 CH2OCH2OCH2CH2CH=CH(CH2) a X 1 (1), wherein R 1 represents a hydrogen atom, a n-alkyl group having 1 to 9 carbon atoms, or a phenyl group, X 1 represents a halogen atom, and a represents an integer of 3 to 14. The present invention also relates to a method for producing terminal conjugated alkadien-1-yl acetate compounds of the following general formula (5): CH2=CHCH=CH(CH2) a OAc (5), wherein a is defined as above, and Ac represents an acetyl group, and a method for producing terminal conjugated alkadien-1-ol compounds of the following general formula (6): CH2=CHCH=CH(CH2) a OH (6), wherein a is defined as above.

The present application relates to the technical field of chemical essence and flavor, and particularly relates to a decenoic acid ester compound, a preparation method and application thereof, and comprises the following steps: (1) preparing 2-(4-methyl-benzylidene) heptanal: under the condition of an inorganic alkaline reagent, p-methylbenzaldehyde and n-heptanal are subjected to aldol condensation reaction to synthesize 2-(4-methyl-benzylidene) heptanal; (2) preparing 2-(4-methyl-benzylidene) heptyl alcohol: under the condition of a reducing agent, 2-(4-methyl-benzylidene) heptanal is reduced to 2-(4-methyl-benzylidene) heptyl alcohol; (3) preparing 5-decenoic acid 2-(4-methyl-benzylidene) heptyl alcohol ester: under the catalysis of an acid, 5-decenoic acid and 2-(4-methyl-benzylidene) heptyl alcohol are subjected to esterification to synthesize 5-decenoic acid 2-(4-methyl-benzylidene) heptyl alcohol ester. The compound in the present application has jasmine aroma and milk aroma, has elegant aroma, has long-lasting aroma, and has important use in the field of daily chemical flavoring.

The invention relates to the technical field of cyclododecanol production, in particular to a method for inhibiting by-product cyclododecane in a cyclododecanol hydrogenation preparation process, which comprises the following steps: mixing one or more of cyclododecanone, epoxy cyclododecane or epoxy cyclododecene as raw materials with a solvent to prepare a raw material solution; the raw material liquid is subjected to a hydrogenation reaction, cyclododecanol is prepared, and the water content in the raw material liquid is 3-15 wt%. By adopting the technical scheme provided by the invention, on the premise of not changing the catalyst and the reaction system, the water content in the raw material liquid is controlled to be 3-15wt%, so that the water content of the reaction system in the reaction process is in a proper range, the generation of a byproduct cyclododecane can be effectively inhibited, and the yield of cyclododecanol is obviously improved; and the yield of the byproduct cyclododecane is reduced, so that the heat load of the tower kettle of the light component removal tower can be reduced by 20-50%.

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.

The present invention relates to processes for preparing propylene oxide, comprising reaction of propene with ethylbenzene hydroperoxide in the presence of a catalyst, as well as to catalysts employed in such processes and to methods for their manufacture. The catalysts of the invention are prepared in a process comprising sol-gel-synthesis of catalyst hydrogel-precursor, drying of catalyst hydrogel precursor, calcining of dried catalyst hydrogel-precursor, and optionally hydrophobizing the calcined catalyst hydrogel-precursor. The catalysts of the invention comprise amorphous titanium doped silica comprising pentahedrally coordinated titanium species.

Provided is a method for preparing a diol. In the method, a saccharide and hydrogen as raw materials are contacted with a catalyst in water to prepare the diol. The employed catalyst is a composite catalyst comprised of a main catalyst and a cocatalyst, wherein the main catalyst is a water-insoluble acid-resistant alloy; and the cocatalyst is a soluble tungstate and / or soluble tungsten compound. The method uses an acid-resistant, inexpensive and stable alloy needless of a support as a main catalyst, and can guarantee a high yield of the diol in the case where the production cost is relatively low.

The present invention relates to the technical field of catalytic chemistry, particularly to a catalyst with a dual catalytic center, its preparation method and use, and a method for producing glycol. The catalyst comprises a porous support and, supported on the porous support, CN, a hydrogenation metal, and an inverse aldol catalyst metal, where the hydrogenation metal and the inverse aldol catalyst metal form clusters with CN. The hydrogenation metal and the inverse aldol catalyst metal are coordinated to the N-sites and supported on the porous support, forming clusters with CN, effectively stabilizing the metal active sites. The catalyst is used to produce glycol from polyhydroxy compounds. Both the raw material conversion and the selectivity for the glycol product are very high. The catalyst has high cycle stability, with no deactivation observed even after four cycles.

The present invention relates to processes for preparing propylene oxide, comprising reaction of propene with ethylbenzene hydroperoxide in the presence of a catalyst, as well as to catalysts employed in such processes and to methods for their manufacture. The catalysts of the invention are prepared in a process comprising sol-gel-synthesis of catalyst hydrogel-precursor, drying of catalyst hydrogel precursor, calcining of dried catalyst hydrogel-precursor, and optionally hydrophobizing the calcined catalyst hydrogel-precursor. The catalysts of the invention comprise amorphous titanium doped silica comprising pentahedrally coordinated titanium species.

The present invention provides: a ceramic-loaded palladium catalyst which has excellent selective reduction properties and is applicable to flow synthesis; a method for producing this ceramic-loaded palladium catalyst; and a flow reaction device which is provided with a ceramic-loaded palladium catalyst. A ceramic-loaded palladium catalyst according to one embodiment of the present invention comprises palladium that serves as an active component and a ceramic carrier that supports the palladium; and with respect to the ceramic carrier, the content ratio of aluminum oxide is 15% by mass to 45% by mass, the content ratio of silicon oxide is 40% by mass to 60% by mass, and the content ratio of magnesium oxide is 5% by mass to 30% by mass.

To provide enhanced systems and methods of chemical synthesis that reduce or eliminate the amount of fuel, particularly fossil fuel, that is burned to provide energy.SOLUTION: A chemical synthesis plant comprising a reactor configured for producing a process stream comprising a chemical product from a reactant; a feed preparation system configured to prepare a feed stream of the reactant for introduction into the reactor; and / or a product purification system configured to separate the chemical product from a reaction byproduct, unreacted reactant, or a combination thereof within the process stream, wherein the chemical synthesis plant is configured such that a majority of the net energy required for heating, cooling, compression, or a combination thereof utilized via the reactor, the feed preparation system, the product refining system, or a combination thereof is supplied from the intermittent energy source (IES).SELECTED DRAWING: Figure 3