301results about "Preparation by oxygen reduction" patented technology

The invention belongs to the field of furfuryl alcohol hydrogenation, and particularly relates to a catalyst for preparing 1, 2-pentanediol from furfuryl alcohol as well as a preparation method and application of the catalyst. The catalyst for preparing 1, 2-pentanediol from furfuryl alcohol comprises a composite oxide carrier and a metal catalyst attached to the composite oxide carrier, the composite oxide carrier comprises an oxide core and magnesium oxide attached to the oxide core; the oxide inner core is selected from one, two or three of TiO2, CeO2 and Al2O3; the metal catalyst is Pt or Pt and doped metal, and the doped metal is selected from at least one of Pd and Ru. A novel catalyst carrier design is adopted, the selectivity of the catalyst to 1, 2-pentanediol is further improved, the selectivity of the catalyst to 1, 2-pentanediol reaches 65% or above, and when a double-doped metal form is adopted, the selectivity of 1, 2-pentanediol reaches 80% or above.

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 belongs to the technical field of organic synthesis catalysts, and particularly relates to a preparation method and application of a composite catalyst for synthesizing 1, 2-pentanediol through furfuryl alcohol hydrogenation. The preparation method comprises the following steps: preparing cerium nitrate, lanthanum nitrate, urea, a surfactant and water into an aqueous solution, dipping spherical gamma-Al2O3, and then sequentially carrying out hydrothermal reaction, drying and roasting to obtain CeO2-La2O3 / Al2O3; the preparation method comprises the following steps: preparing palladium chloride, ruthenium chloride, hydrochloric acid and water into an acidic solution, dipping CeO2-La2O3 / Al2O3, drying, roasting and performing hydrogen reduction in sequence, thereby obtaining the composite catalyst Pd-Ru-CeO2-La2O3 / Al2O3. The composite catalyst can be applied to preparation of 1, 2-pentanediol through furfuryl alcohol hydrogenation. By preparing the composite catalyst, the defects of the existing catalyst in the aspects of selectivity, stability and cost are overcome.

To provide methods for controlling continuous, unmodulated, multiple catalytic conversion step processes in order to accommodate changes in the performance of each catalyst during the course of the process when operating chemical conversion processes using two or more sequential catalytic conversions.SOLUTION: In this method, certain process parameters are used in a manner that is indicative of changes in catalyst performance, and this control method provides for adjustment of at least one of: the absolute amount of catalytically active species, the relative amounts of each of a first catalyst and a second catalyst, and at least one of the rate of feed or concentration of raw material to a reaction zone.SELECTED DRAWING: None

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 invention relates to a powdered Ni / La / SBA-15 catalyst, a preparation method thereof and its use. The powdered Ni / La / SBA-15 catalyst is composed of nickel oxide, lanthanum oxide and SBA-15 molecular sieve; wherein the content of nickel element is 10.0-25.0% by weight of the catalyst, the content of lanthanum element is 3.0-10.0% by weight of the catalyst, and the remainder is the total content of oxygen element and SBA-15 molecular sieve. The powdered Ni / La / SBA-15 catalyst of the present invention is applied to a method for preparing low-carbon alcohols by hydrogenation of sorbitol, showing good catalytic activity, sorbitol conversion rate greater than 96%, low-carbon alcohol total yield greater than 75%, and the catalyst is operated in a fixed bed reactor for 500h without significant decrease in activity and selectivity, and has good industrial application prospects.

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.

The invention discloses a metal-free catalyst, a preparation method and application of the metal-free catalyst in preparation of benzyl alcohol through transfer hydrogenation of biomass-based benzaldehyde, and the catalyst is a nitrogen-doped carbon catalyst; in the catalyst, nitrogen is used as a Lewis alkaline site, and does not contain a Lewis acidic site and a # imgabs0 # acidic site. According to the preparation method of the metal-free nitrogen-doped carbon-based catalyst, the metal-free nitrogen-doped carbon-based catalyst (MF-NC) can be prepared through solvothermal self-assembly and pyrolysis processes by virtue of a structure regulator and taking a ZIF material as a sacrificial template, the preparation process is simple, the surface appearance is controllable, and the metal-free nitrogen-doped carbon-based catalyst has a relatively high specific surface area. The obtained MF-NC can efficiently and selectively convert benzaldehyde into benzyl alcohol through a Lewis alkaline site mediated MPV transfer hydrogenation reaction by taking cheap and renewable bioethanol as an in-situ hydrogen donor and a reaction solvent.

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 catalyst for simultaneously producing an alcohol and an acid from a sugar and a method for simultaneously producing an alcohol and an acid from a sugar by using same and, more specifically, to a catalyst that is easily recoverable and enables the stable and simultaneous production of an acid and an alcohol from a sugar under mild reaction conditions with low temperature and low pressure compared with existing reaction conditions, and to a method for simultaneously producing an alcohol and an acid from a sugar by using same.

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 method for preparing a salt-resistant bimetallic supported catalyst and its application in the hydrogenation or oxidation reaction of polyols, belonging to the technical field of catalysts. The preparation process of the present invention includes metal oxide support pretreatment, salt washing treatment, first roasting treatment, impregnation treatment, second roasting treatment and desalination treatment. The present invention successfully removes residual salt on the surface of the catalyst by accurately controlling the conditions of each step and adopts an electrochemical desalination process, thereby improving the stability and activity of the catalyst in a high-salt environment. The bimetallic supported catalyst prepared by the present invention can be effectively applied to the hydrogenation and oxidation reactions of polyols, and has significant salt resistance, excellent catalytic efficiency and long-term stability. The catalyst of the present invention has a high reaction conversion rate and selectivity, and exhibits a stronger anti-degradation ability in a high salt concentration environment, solving the technical problem that the existing catalyst fails in a salt environment.

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.

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.

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.