199results about "Organic oxidation" patented technology

Simple, economical preparative processes for the provision of pure hydroxyl functional materials that are derived by converting the alkene groups of the unsaturated molecules found in vegetable oils, into hydroxyl groups.

Disclosed is an optimized process and apparatus for more efficiently and economically carrying out the liquid-phase oxidation of an oxidizable compound. Such liquid-phase oxidation is carried out in a bubble column reactor that provides for a highly efficient reaction at relatively low temperatures. When the oxidized compound is para-xylene and the product from the oxidation reaction is crude terephthalic acid (CTA), such CTA product can be purified and separated by more economical techniques than could be employed if the CTA were formed by a conventional high-temperature oxidation process.

The present invention relates to a process for the production of polyols based on natural unsaturated oils.

This invention is linked to the chemical, pharmaceutical and cosmetic industries, where the bactericidal, virucidal, parasiticidal and fungicidal properties of the ozonized vegetable oils and fats are considered. The emulsified vegetable oil or fat is driven to react with ozone in a bubbling reactor, covered by a jacket that makes possible to control the reaction's temperature. Ozone reacts with the double bonds present in vegetable oil or fat, giving rise to the formation of different peroxidic species, responsible for the biological action of those products. The ozonized vegetable oils and fats in those conditions are applied with satisfactory and advanced results to the treatment of diseases in diverse medical specialties, such as ophthalmology, dentistry, dermatology, gastroenterology, gynecology, parasitology, and others. Likewise, the cosmetic application of the ozonized vegetable oil and fats is described, considering their oxygenating and revitalizing properties of the skin. The results of the toxicological studies previously performed show that the products obtained according to this process do not show any cross or adverse reaction.

The invention discloses a Ti-Si molecular sieve / diatomite composite catalyst and a preparation method thereof, which is characterized in that: the catalyst is formed by compounding Ti-Si molecular sieve (such as TS-1 and TS-2) and diatomite with particular chemical property which is treated in a particular way, and is modified chemically by transition metal oxide after molding; the preparation method comprises the following steps: (1) after being treated with acid solution and alkaline solution, the diatomite needs heat treatment in high temperature to obtain particular chemical property; (2) the molding Ti-Si molecular sieve / diatomite composite catalyst is modified chemically by transition metal oxide (such as lanthanum and nickel). The composite catalyst can be used as the catalyst of selective oxidation reaction of the organic compound (such as the catalytic hydroxylation reaction of phenol) on fixed bed liquidoid, which uses hydrogen peroxide as the oxidant. The Ti-Si molecular sieve / diatomite composite catalyst has the advantages of high catalytic activity, high stability, long service life and easy separation, recovery and regeneration of the catalyst. When using the catalyst in the hydroxylation reaction of phenol of fixed bed liquidoid, under the reaction conditions of 84 DEG C, atmospheric pressure and 8.46h<-1> space velocity, the conversion rate of phenol is greater than 33%, the selectivity of diphenol reaches 99.9%, and the effective use rate of hydrogen peroxide is greater than 85%.

The invention provides methods of synthesizing omega-3 and omega-6 very long chain polyunsaturated fatty acids (VLC-PUFAs, C28-C42:4, 5 and 6), analogs and derivatives thereof, pharmaceutical compositions containing these isolated VLC-PUFA compounds and therapeutic uses therefor.

The invention discloses a high stability catalyst used for oxidizing nano-Au by CO at room temperature and a preparation method thereof. The catalytic active component of the catalyst is Au or alloy formed by Au and noble metal Rh (or Pt). The carrier is TiO2 or TiO2 modified by rare earth, wherein, the rare earth is one or more than one of Ce, La, Ho, Dy and Tm. The preparation of the catalyst is divided into two steps: the sol-gel method is adopted to prepare TiO2 and carrier material of TiO2(Re-TiO2) modified by rare earth; then Re-TiO2 is taken as the carrier, the deposition-precipitation method is adopted to prepare a Au-Rh(or Pt) / Re-TiO2 catalyst. The catalyst of the invention has very high stability and can catalyze CO to lead to the complete conversion at room temperature. The activity of the catalyst remains the same after the catalyst is used for 1,000 hours.

Provided are: novel rutile titanium dioxide nanoparticles each having a high photocatalytic activity; a photocatalyst including the rutile titanium dioxide nanoparticles; and a method for oxidizing an organic compound using the photocatalyst. The rutile titanium dioxide nanoparticles each have an exposed crystal face (001). The rutile titanium oxide nanoparticles may be produced by subjecting a titanium compound to a hydrothermal treatment in an aqueous medium in the presence of a hydrophilic polymer. A polyvinylpyrrolidone, for example, is used as the hydrophilic polymer. An organic compound having an oxidizable moiety can be oxidized with molecular oxygen or a peroxide under photoirradiation in the presence of the photocatalyst including the rutile titanium oxide nanoparticles.

The present invention relates generally to polymers and monomers derived from agricultural feedstocks, and more particularly to methods for the production of monomers from renewable agricultural resources such as feedstocks, for example canola, flax and tallow, and polymers, in particular polyurethanes produced from monomers derived from such feedstocks. The present invention also relates to novel processes for the production of short-chain alcohols, as well as hydroxyl wax esters, from renewable feedstocks. An improved apparatus for carrying out ozonolysis reactions is also disclosed.

Oxidation catalysts which comprise at least one constituent active in the catalysis of oxidation reactions, and a support for said constituent, characterized in that the support includes carbon nanotubes; are disclosed along with processes for their use including the oxidation of hydrogen chloride. Such catalysts can exhibit a higher stability and activity than that of catalysts of the state of the art.

A solid phase reaction system for oxidation of an organic compound,having high industrial value in which an organic solvent exerting a reverse influence on earth environments is not necessary, reuse of a catalyst is possible, and high yield can be attained, comprisinga mixture of a powdery dispersion medium and a powder of a solid catalyst for the above-described oxidation reaction, and the above-described organic compound and aqueous hydrogen peroxide,wherein the above-described organic compound, the above-described solid catalyst and the above-described aqueous hydrogen peroxide are dispersed in the above-described mixture so that they get into contact mutually.

There is disclosed a process for hydroxylating vegetable oils to create polyols suitable for use in polymer processes, particularly polyurethane processes. The process includes contacting a vegetable oil with hydrogen peroxide and an organic acid having 1-3 carbon atoms under conditions sufficient to oxidize carbon to carbon double bonds found in the vegetable oil. There is also disclosed a vegetable oil based polyol having an acid number of 2.0 mg KOH / g or less. The polyol contains 0.1% w / w or less water, 0.1% w / w or less of the organic acid used to prepare the polyol, and triglyceride groups having fatty acid moieties ranging from C16 to C18. The fatty acid moieties contain pendant carboxylate groups having from 1 to 3 carbon atoms.

The invention relates to a preparation method for aldehyde or alkone, in particular to a method for preparing aldehyde or alkone by oxygen catalysis and alcohol oxidation under the mild condition. Themethod comprises the following steps: according to the 5 mmol of reaction substrate, 1-8 percent of 2,2,6,6-tetramethylpiperidine-oxygen radical (TEMPO) or a derivative thereof, 4-20 percent of halogen-containing compound and 4-20 percent of nitric acid or nitrate are taken as the catalysts, 0.1-0.8 MPa oxygen or air is taken as the oxidant, then the reaction is carried out for 1-36 h at the temperature of 0-80 DEG C, a series of alcohols can be oxidized into aldehyde or alkone with high selectivity, a catalyst TEMPO and the derivative thereof can be circularly and alternately used, the turn-over number (TON) is up to 800 and the cost is greatly reduced. The invention has the advantages of safer reagent with lower price, wider applicability of the substrate, mild reaction conditions, convenient product separation, no pollution to the environment, easy industrialization, and the like.

Oxidized compounds are produced in a continuous integrated process in liquid phase, which comprises: Step I, synthesis of non acidic hydrogen peroxide solutions by direct reaction between hydrogen and oxygen by catalytic reaction utilizing a noble metal catalyst. Step II, this hydrogen peroxide solution is directly mixed with an organic substrate, a suitable catalyst and optionally a solvent. The integrated process requires no treatment step and is particularly well adapted to the production of propylene oxide.

There is disclosed an electrochemical deblocking solution for use on an electrode microarray. There is further disclosed a method for electrochemical synthesis on an electrode array using the electrochemical deblocking solution. The solution and method are for removing acid-labile protecting groups for synthesis of oligonucleotides, peptides, small molecules, or polymers on a microarray of electrodes while substantially improving isolation of deblocking to active electrodes. The method comprises applying a voltage or a current to at least one electrode of an array of electrodes. The array of electrodes is covered by the electrochemical deblocking solution.

A process for oxidizing organic compounds is disclosed. Hydrogen peroxide is used to oxidize an oxidizable organic substrate in the presence of a silica-modified titania / silica-containing catalyst. A method for preparing a catalyst using a copolymer of diethoxysilane and ethyl titanate is also disclosed.

A process for separating a blend of saturated and unsaturated fatty acids or saturated and unsaturated fatty acid alky esters into a first fraction enriched with the saturated fatty acids or saturated fatty acid alkyl esters and a second fraction enriched with unsaturated fatty acids or unsaturated fatty acid alkyl esters. When separating fatty acids, the process includes the steps of (a) saponifying a blend of long chain saturated and unsaturated fatty acids to form free fatty acids, (b) complexing the free fatty acids with urea, and (c) separating the urea complexed free fatty acids into a first fraction enriched with saturated free fatty acids and a second fraction enriched with unsaturated free fatty acids. When separating fatty acid alkyl esters, the process includes the steps of (i) complexing the fatty acid alkyl esters with urea, and (ii) separating the urea-complexed fatty acid alkly esters into a first fraction enriched with saturated fatty acid alkyl esters and a second fraction enriched with unsaturated fatty acid alkyl esters.

Catalysts prepared from abundant, cost effective metals, such as cobalt, nickel, chromium, manganese, iron, and copper, and containing one or more neutrally charged ligands (e.g., monodentate, bidentate, and / or polydentate ligands) and methods of making and using thereof are described herein. Exemplary ligands include, but are not limited to, phosphine ligands, nitrogen-based ligands, sulfur-based ligands, and / or arsenic-based ligands. In some embodiments, the catalyst is a cobalt-based catalyst or a nickel-based catalyst. The catalysts described herein are stable and active at neutral pH and in a wide range of buffers that are both weak and strong proton acceptors. While its activity is slightly lower than state of the art cobalt-based water oxidation catalysts under some conditions, it is capable of sustaining electrolysis at high applied potentials without a significant degradation in catalytic current. This enhanced robustness gives it an advantage in industrial and large-scale water electrolysis schemes.

A method for manufacturing an oxygen sensor unit of the type which includes at least a shaped body of a solid electrolyte, an inner electrode provided on an inside surface of the shaped body and exposed to a reference gas, an outer electrode provided on an outside surface of the shaped body and exposed to a gas to be measured, and a porous protective layer covering the outer electrode and a portion of the shaped body adjoining to said outer electrode wherein the solid electrolyte is made of a mixture of zirconia and a stabilizer therefor and is constituted of a sintered product of partially stabilized zirconia. The method is characterized in that the partially stabilized, sintered zirconia is obtained according to a high temperature sintering process which includes at least the step of sintering the mixture at a temperature of 1200° C. or over for a duration of 2 to 6 hours wherein a value obtained by integrating a variation in the sintering temperature with the duration in the sintering process is in the range of 300 to 1500° C..hour.

Methods to convert biobased oils, oil derivatives, and modified oils to highly functionalized esters, ester polyols, amides, and amide polyols. The products can be used to make polyurethane and polyester films and foams.

The invention discloses a mesoporous molecular sieve catalyst, a preparation method thereof and application thereof in preparing aldehyde ketone by gas-phase catalytic selective oxidation of alcohols. The catalyst is marked as Ag-HMS, wherein the molar ratio of SiO2 to silver is 10-500. In the preparation method for the catalyst, a nonionic surfactant is taken as a template agent, tetraethoxysilane is taken as a silicon source and a water soluble silver salt is taken as a silver source. The catalyst has the advantages that: the silver is introduced, and the unique external circular platy particle feature and internal worm structure of the mesoporous molecular sieve HMS and the high dispersion and superhigh loading capacity of active components silver species are well maintained. The catalyst is applied to gas-phase catalytic selective oxidation of the alcohols, has high activity and good selectivity, and has the conversion rate for the alcohols of between 85 to 100 percent and the selectivity for the aldehyde ketone of over 96 percent which are much higher than those of the conventional related catalysts.