144results about "Preparation by oxygen reduction" patented technology

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.

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.

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.

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 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 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.

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

The present disclosure relates to using monomer-based heteropolymers to create random heteropolymers that act as biomimetic catalysts that can be evolved to mimic activities of different classes of natural enzymes. The random heteropolymers comprise a mixture of heteropolymer sequences wherein a portion of the heteropolymers comprise a catalytically active region similar to that of a naturally occurring enzyme active site.

The invention discloses a method for producing bio-based dihydric alcohol. According to the method, bio-based methyl 2-tetrahydrofuroate, tetrahydrofurfuryl propionate and methyl 2-(tetrahydrofuran-2-yl) acetate are used as precursors for dihydric alcohol synthesis, Cu-Ga-Mn / SiO2 or Cu-Ga-Mn / SiO2-Al2O3 is used as a hydrogenation catalyst, cyclic ether ester structures are synchronously activated in a fixed bed reactor, ester group hydrogenation and tetrahydrofuran ring opening are synergistically carried out, and the high-purity tetrahydrofuran is obtained. The reaction path is shortened. The hydrogenation catalyst is prepared by combining a sol-gel method and hydrothermal synthesis through roasting and reduction, active components are uniformly distributed, and the hydrogenation catalyst has excellent hydrogenation activity and structural stability.

The present invention refers to a process for preparing an enantiomeric pure Diels-Alder Adduct, in particular a santalol derivative, i.e. (-)-(Z)-β-santalol.

The present disclosure provides systems and methods for producing a regenerated hydrogenation catalyst used for hydrogenating a biomass feedstock. The method can include a regeneration cycle, in which a fouled hydrogenation catalyst is contacted with (a) a first flushing medium comprising water and a gaseous phase comprising oxygen and (b) a second flushing medium comprising water and a gaseous phase comprising at least 90% nitrogen by volume. In particular, multiple regeneration cycles can be used to improve efficiency in removing sulfur-containing impurities from the fouled catalyst.

The present invention provides a novel compound, (4Z,6E)-4,6-undecadienyl trimethylacetate (1). The present invention further provides a process for preparing (4Z,6E)-4,6-undecadienyl trimethylacetate (1), the process comprising subjecting a 4-halobutyl trimethylacetate compound (2) wherein X1 represents a halogen atom, to a phosphonium salt formation reaction with a phosphine compound of the following general formula (3) wherein Ar represents, independently of each other, an aryl group, to obtain a [4-(trimethylacetyloxy)butyl]triarylphosphonium halide compound (4) wherein Y represents a halogen atom, and Ar is as defined above, subjecting the [4-(trimethylacetyloxy)butyl]triarylphosphonium halide compound (4) to a deprotonation reaction in the presence of a base to obtain a reaction product mixture, and subjecting the reaction product mixture to a Wittig reaction with (2E)-2-heptenal (5) to obtain (4Z,6E)-4,6-undecadienyl trimethylacetate (1).

The invention discloses a method for preparing 1, 3-propylene glycol based on catalysis of a copper complex, and relates to the technical field of catalytic hydrogenation of aldehyde. According to the method, the problems of high reaction temperature and poor selectivity in the prior art are solved, the reaction process is simple, the yield of 1, 3-propylene glycol is high, and the selectivity is good; a cheap copper catalyst phosphine ligand is used, so that the cost is relatively low; the reaction conditions are mild, the temperature and the pressure are relatively low, and the requirement on production equipment is not high; the reaction system is wide in application range; the 1, 3-propylene glycol is prepared by hydrogenation of the 3-hydroxypropionaldehyde, the method is milder and quicker, and the method is also suitable for hydrogenation reaction of other aldehyde substances.

The invention relates to a process for preparing MPG from an aldohexose. It also relates to the use of a catalytic system to prepare MPG from a monosaccharide.

The present disclosure provides an equipment for production of butanol and octanol and a triple-effect distillation method, comprising two processes: butanol separation and octanol separation, both processes use same feedstocks to obtain n-butanol, iso-butanol and octanol products through different procedures, respectively, wherein butanol separation process is sequentially divided into hydrogenation, removal of light and heavy components and separation of isomeric; and octanol separation process is sequentially divided into separation of isomeric, hydrogenation and removal of light and heavy components; the removal of light and heavy components for butanol is carried out by a butanol pre-distillation column and a butanol distillation column, and the separation of isomeric for butanol is carried out by a first butanol isomer column and a second butanol isomer column; and the separation of isomeric for octanol is carried out by a first butyraldehyde isomer column and a second butyraldehyde isomer column.

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 invention provides a novel preparation method of 2-(3-isopropyl phenyl) propane-2-alcohol, which comprises the following steps: reacting m-diisopropylbenzene, air and alkali liquor to obtain an oxidation reaction solution, reducing the oxidation reaction solution, and then washing, rectifying and de-weighting to obtain a 2-(3-isopropyl phenyl) propane-2-alcohol product. The method has the advantages of convenience, rapidness, high selectivity and high practical value.

The present invention relates to the field of energy and chemical engineering, and provides an anthracene-based compound, a preparation method therefor, and a use thereof as a solar thermal fuel. The anthracene-based compound of the present invention can be converted into a dimer and store light energy as chemical energy under irradiation with 365 nm ultraviolet light, and under irradiation with 254 nm ultraviolet light, undergoes a photodepolymerization reaction and releases heat, that is, an anthracene-based solar thermal fuel can store or release photothermal energy by means of a reversible photodimerization / depolymerization reaction. In addition, the anthracene-based compound also has the unique advantage of light-controlled reversible solid-liquid phase change and can realize the simultaneous storage of photon energy and phase change energy. The anthracene-based compound has a storage energy density of about 65 kJ / mol and a storage half-life of up to 60 days. The anthracene-based compound and the preparation method therefor provided by the present invention provide a new strategy for light energy storage and utilization.

A method can include oxidizing hydrocarbons (and optionally oxygenates with oxygenation states less than carboxylic acids such as alcohols, aldehydes, etc.), separating the oxygenated hydrocarbons into saponifiable species and nonsaponifiable species, and treating the saponifiable species (e.g., heat treating, hydrogenation, etc. such as to reduce unsaturated bonds to saturated bonds, to convert oxygenates with greater degrees of oxygenation than monocarboxylic acids into monocarboxylic acids, etc.).