514 results about "Tropolone" patented technology

A bioengineered synthesis scheme for the production of quinic acid from a carbon source is provided. Methods of producing quinic acid from a carbon source based on the synthesis scheme as well as conversion of quinic acid to hydroquinone are also provided.

An antimicrobial mixture comprising or consisting of:

one or more compounds of the formula (I)

their salts or solvates,

• • wherein R¹ and R² in each case independently of one another are chosen from the group consisting of: H, OH, F, Cl, Br and I, and wherein X in each case denotes:

(CH₂)_m

where m=1, 2 or 3 or

OCH_2n

where n=1, 2 or 3 or

O—CH₂—CH(R³)

where R³═CH₃ or CH₂OH or

(CH₂—O_pCH₂

where p=1 or 2, wherein in the compound(s) of the formula I

a primary alcohol function CH₂OH is optionally replaced by a radical which is chosen from the group consisting of CH₂OR⁴, COOH and COOR⁴ and/or

a secondary alcohol function CHOH is optionally replaced by the radical CHOR⁴,

wherein each R⁴ denotes an aliphatic or aromatic radical, independently of the meaning of further radicals, and

one, two or more compounds chosen from the group consisting of the tropolones of the formula (II)

wherein the substituents R⁵, R⁶, R⁷, R⁸, R⁹ independently of one another have the following meaning: H; linear or branched, saturated or unsaturated, aliphatic hydrocarbon radical having up to 30 C atoms; OH;

OR¹⁰, wherein R¹⁰ is a linear or branched, saturated or unsaturated, aliphatic hydrocarbon radical having up to 30 C atoms; COOH;

COOR¹¹, wherein R¹¹ is a linear or branched, saturated or unsaturated, aliphatic hydrocarbon radical having up to 30 C atoms;

NO₂,

NH₂, F, Cl, Br, I.

Polycarbonates containing low or undetectable levels of Fries rearrangement products and comprising repeat units derived from one or more of resorcinol, hydroquinone, methylhydroquinone, bisphenol A, and 4,4′-biphenol have been prepared by the melt reaction of one or more of the aforementioned dihydroxy aromatic compounds with an ester-substituted diaryl carbonate such as bis-methyl salicyl carbonate. Low, or in many instances undetectable, levels of Fries rearrangement products are found in the product polycarbonates obtained as the combined result of a highly effective catalyst system which suppresses the Fries reaction and the use of lower melt polymerization temperatures relative to temperatures required for the analogous polymerization reactions using diphenyl carbonate.

The invention discloses a preparation method of polycarboxylic acids high efficiency water reducer, which includes steps of firstly synthesizing methoxypoly(ethylene glycol) monomethyl ether acrylate large monomer from methoxypoly(ethylene glycol) monomethyl ether and crylic acid which are used as raw materials, then copolymerizing the esterified large monomer and the acrylic acid to prepare the polycarboxylic acids high efficiency water reducer. In the synthesis of the esterified large monomer, hydroquinones and hydroquinone monomethyl ether are employed to coordinatedly blocking polymerization, thereby reducing failure ratio of unsaturated double bond, increasing effective content of the synthesized water reducer, increasing concrete water reducing ratio, and increasing slump retaining performance.

The invention discloses a preparation method for exo-dicyclopentadiene from bridge-type dicyclopentadiene or cyclopentadiene, belonging to the exo-dicyclopentadiene preparation technology. The method includes preparing a solution composed of bridge-type dicyclopentadiene or cyclopentadiene, and benzene, or toluene, or benzyl alcohol, or decalin, or cyclohexane, or heptane, or hexane at a certain quality ratio, adding p-tert-butylcatechol, or 2, 5-di-tert-butylhydroquinone, or 2,6-di-tertbutyl-4-methylphenol, or hydroquinone, or 2-methyl-1,4-dihydroxybenzene, or o-hydroquinone inhibitor and carrying out reaction at a certain temperature and pressure, distilling and separating to obtain the exo-dicyclopentadiene. The invention has the advantages of one-step synthesis without catalyst, mild reaction conditions and high yield, and is suitable for industrial production.

The invention relates to an industrial production method for semi-crystal poly(aromatic ether nitrile), which belongs to the field of polymer material. The method comprises the following steps: 2, 6-dichloro benzonitrile and hydroquinone are taken as raw materials; anhydrous potassium carbonate is taken as a catalyst; in the presence of a solvent and a dehydrating agent, the raw materials and the catalyst react under atmospheric pressure to obtain the poly(aromatic ether nitrile) homopolymer with low molecular weight and regular chain segments; and then the molecular weight of polymer is increased through pressurization, so as to obtain the semi-crystal poly(aromatic ether nitrile) polymer with high molecular weight. Due to the increase of crystallinity and molecular weight, the mechanical properties and heat resistance of the semi-crystal poly(aromatic ether nitrile) polymer are obviously improved.

The invention relates to a method for preparing alpha-arbutin which comprises steps of preparing slope seeds, selecting culture mediums, optimizing reaction conditions and extracting products and so on. The invention employs Xanthomonas campestris to ferment to produce the alpha-arbutin without use of organic solvents during the production and generation of harmful substances during the fermentation process. The invention has advantages of low production cost, simple process, and safe operation. And the alpha-arbutin yield produced by the method is high, the alpha-arbutin content in fermentation liquor is 8-11g/L, and the conversion rate of the hydroquinone can be 91%. The alpha-arbutin can obviously inhibit activities of tyrosinase, reduce tyrosinase deposition in skins, and bleach skins, remove freckles.

Synthesis of poly ether-ether-ketone resin as sulfolane as solvent is carried out by adding into 4,4,-difluoro-benzophenone and hydroquinone related to excessive dihydroxy-benzene 0.1~1%( or insufficient 0.1~1% ) successively, agitating, heating to 75~85 degrees C, adding into K2CO3 and Na2CO3 mixed salt, constant-temperature reacting at 230~260 degrees C for 1~3hrs, putting the reactant into cool water, cooling, freezing, crushing, filtering, boiling the solid product by non-ionic water repeatedly, removing solvent and by-product and drying the refined materials in oven to obtain final product. It can acquire poly ether-ether-ketone resin with two different hydroxyl terminal groups.

The invention discloses a synthesizing method of N-phenyl maleimide, which comprises the following steps: 1) acylating the maleic anhydride and aniline in the solvent; 2) reacting N-phenyl maleamic acid with hydroquinone as inhibitor and p-toluenesulfonic acid and N-ethyl pyrrolidone as double catalyst; decompressing the liquid to remove solvent; obtaining the rought product; 3) recrystallizing to obtain the product.

The present invention is a capacitor of a triphenyl phosphine oxide film as a base dielectric. More specifically, the base dielectric film is selected from the group consisting of Bisphenol-A (Bis-A PEPO). 4',4'-biphenol (BP-PEPO), and Hydroquinone (HQ-PEPO). TPPO based polymers have a very high breakdown strength, dielectric constant, low dissipation factor and high energy density. An ultra-thin coating can leverage the capabilities of this new dielectric, and potentially other commercial polymer films, to make possible energy storage in excess of 1 J/cc. The triphenyl phosphine oxide film can be fabricated containing a conducting PolyANiline (PAN) polymer layer located between the electrode and core polymer, or by being dip coated with PAN.

The invention relates to a method for preparing hydroquinone (HQ for short), which comprises the following steps: (1) dripping aqueous solution of sodium nitrite into sulphuric acid solution of para-aminophenol to carry out diazotization reaction to obtain dark brown diazonium solution, and using urea, thiourea, thioether, thioalcohol and the like to destroy excessive sodium nitrite; (2) pre-adding dilute sulphuric acid into a reaction kettle, refluxing and dripping the diazonium solution obtained in step (1) to carry out hydrolysis reaction; (3) after extracting hydroquinone from the hydrolyzed solution, using water-phase dilute sulphuric acid in the hydrolysis reaction, and after extracting oil phase and removing solvent, obtaining the crude product of the hydroquinone; and (4) refining the crude product and carrying out post treatment.

The invention provides an amphoteric water-coal-slurry dispersing agent and a preparation method thereof. The method comprises that: after polyethyleneglycol and polymerization inhibitor hydroquinone are mixed, acrylic acid, catalyst paratoluenesulfonic acid and a water-carrying agent dimethylbenzene are sequentially added to the mixture, are heated to react and are decompressed and distilled to obtain pale brown transparent liquid; the pale brown transparent liquid is adjusted to neutrality by Na2CO3 solution, is washed by saturated NaCl solution, and is extracted by 30ml aether to obtain an intermediate product I; deionized water, sulphonate or sulfoacid, cationic monomer and sodium bisulfate are stirred and dissolved; and the intermediate product I is dripped into persulfate aqueous solution to react to obtain polymer solution of an amphoteric ionic dispersing agent. The amphoteric water-coal-slurry dispersing agent synthesized by the preparation method introduces a long-chain group on the premise that the amphotericity of the dispersing agent is maintained, and can obviously improve the electric charge condition of coal particle surface so as to change the hydrophobic property of coal surface, thereby playing an excellent effect of viscosity reduction.

The invention provides a preparation method of a mixed cresol modified meta-xylylene diamine epoxy resin curing agent. The method comprises the following steps of: adding meta-xylylene diamine into an N2-charged reaction kettle; raising the temperature to 80-95 DEG C; adding hydroquinone; fully mixing; adding cardanol; keeping the temperature at 85-95 DEG C till a solution is clear and transparent; adding a catalyst; gradually adding polyformaldehyde in batches simultaneously; lowering the temperature to 70-80 DEG C; vacuumizing and dehydrating; after dehydrating, raising the temperature to 130-150 DEG C; undergoing a polymerization reaction; cooling to 70-85 DEG C; filtering the catalyst; diluting to 15-25 percent by using an organic solvent; and discharging to obtain the mixed cresol modified meta-xylylene diamine epoxy resin curing agent. A product prepared with the method has the advantages of stable performance, high curing speed, low toxicity, high transparency, unremarkable whitening phenomenon, nontoxicity and freeness of irritation, can be applied to underwater construction, and is a superior sea heavy-duty coating.

The invention belongs to the field of electrochemical detection and discloses a modified electrode for detecting hydroquinone and catechol. The modified electrode comprises a substrate electrode as well as graphene treated by L-tryptophan and attached on the substrate electrode. The modified electrode disclosed by the invention can be used for respectively detecting the hydroquinone and the catechol in a quantitative manner without a mutual interference problem, wherein a detecting linear range of the catechol is 5*10<-6>mol/L-3*10<-4>mol/L, and detecting limit is 1.45*10<-7>mol/L; and the detecting linear range of the hydroquinone is 5*10<-6>mol/L-5*10<-4>mol/L, and the detecting limit is 1.69*10<-7>mol/L.

A process for preparing plant extracts is provided. Plant materials, including tropolones, lignins and polar molecules, are mixed with a liquid polar solvent to form an extraction mixture, which is maintained under extraction conditions effective to extract lignins, polar molecules and at least 50% of the tropolones into the polar solvent to form a pregnant polar solvent liquid phase. The pregnant polar solvent phase is separated from the solid plant materials, and mixed with a substantially immiscible nonpolar solvent under conditions effective to partition the tropolones and lignins substantially into the nonpolar solvent and to partition the polar molecules substantially into the polar solvent to form a partitioned nonpolar solvent phase comprising lignins and tropolones, and a partitioned polar solvent phase comprising the polar molecules, and separating the polar solvent phase from the nonpolar solvent phase to obtain a polar plant extract and a nonpolar plant extract.

The invention relates to a separation and purification method of catechol and hydroquinone prepared by hydroxylation reaction of phenyl hydrate with hydrogen peroxide, wherein the product consists of water, phenyl hydrate, pyrocatechol, p-dihydroxy benzene and tar. The separation and purification method of present invention principally includes the following steps: transmitting resultant of reaction into normal pressure leading tower, and water solution containing phenols on tower top partially entering extraction column for reclaiming phenyl hydrate; the liquid of leading tower passing though de-phenol main tower, de-phenol auxiliary tower in sequence and tower top fraction of auxiliary tower returning main tower; the liquid of de-phenol auxiliary tower passing through pyrocatechol fractionating tower and p-dihydroxy benzene fractionating tower and then obtaining producers of pyrocatechol and p-dihydroxy benzene whose purity is more than 99% in sequence, at last the tar discharged from decoking tower.

The invention discloses polyarylether polymers containing aminophenyl lateral group and a synthesis method thereof, and belongs to the technical fields of high molecular materials and synthesis thereof. The polymers comprise polyether ether ketone containing 4-aminophenyl lateral group, the polyether ether ketone containing the aminophenyl lateral group, polyether ether naphtonone containing the aminophenyl lateral group, polyether ether sulfone containing the aminophenyl lateral group or sulfonated polyether ether ketone containing the aminophenyl lateral group; the polymers are prepared by polycondensation reaction of 4-aminophenyl hydroquinone monomer and difluoro monomer or dichloro monomer. In the synthesis method, a functional amino is introduced into a molecular structure of the polyarylether ketone (sulfone) to obtain a novel soluble polyarylether ketone (sulfone) containing the amino. The materials of the series have the advantages of high thermal stability, good film forming property, good reaction cross-linking property and good functionality. Moreover, the amino as a latent reaction cross-linking point can cause the materials of the series to have a plurality of advantages.

The invention discloses an amino-functionalized water-soluble pillar[6]arene and a preparation method thereof. The preparation method for amino-functionalized water-soluble pillar[6]arene comprises the following steps: (1) preparing 1,4-bis(2-bromoethoxy)benzene (I) from hydroquinone dihydroxyethyl ether; (2) preparing bromo-functionalized pillararene (II) from 1,4-bis(2-bromoethoxy)benzene (I); (3) preparing azido-functionalized pillararene (III) from bromo-functionalized pillararene (II); and (4) preparing the amino-functionalized water-soluble pillar[6]arene with azido-functionalized pillararene (III) as a raw material. The amino-functionalized water-soluble pillar[6]arene prepared in the invention has a pillar framework which is composed of six benzene rings and six methylene groups and connected with twelve amino groups and contains a plurality of recognition sites; the amino-functionalized water-soluble pillar[6]arene has good dissolvability in both methanol and an aqueous acidic solution; and the preparation method has the advantages of mild reaction conditions, simple operation, high product yield, large molecular cavity and the like.

A process for catalytically synthesizing alpha-arbutoside from the free or immobilized cells of Xanthomonas campestris (CGMCC No.1243) includes such steps as preparing somatic cells, choosing reaction system, choosing immobilizing carrier, preparing immobilized cells, optimizing reaction condition, and extracting product. Said alpha-arbuto side can be used for beautifying skin.

The invention discloses a side group sulfonic acid polyarylether material, a method for preparing the same and application thereof, which belong to the technical field of functional polymer materials. In particular, the method comprises the following steps: performing polycondensation reaction of 2, 5-diphenyl-hydroquinone and dual-halogen monomers such as 4, 4'-difluoro-benzophenone, 4, 4'-difluoro-diphenylsulfone, 2, 6-difluoro-benzonitrile and the like as well as other diphenol monomers, and then preparing a series of side group sulfonic acid polyarylether proton exchange membranes with controllable sulfonation point and sulfonation degree by a moderate post-sulfonation method. The proton exchange membranes prepared by the method have the advantages of high thermal stability, good solubility and film-forming property, excellent hot water dimensional stability, low methanol permeability and high proton conductivity. The membrane materials used by the method have the advantages of simple preparation process, mild and controllable reaction, wide application temperature and excellent performance, thus the membrane materials can be applied to proton exchange membrane fuel cells and direct methanol fuel cells.

The invention relates to a halogen-free phosphate fire retardant used for engineering plastics and a method for producing the same, belonging to the engineering plastic fire retardant and the method for synthesizing the engineering plastic fire retardant technical field. The chemical name of the fire retardant is hydroquinone double phenyl bisphosphate oligomer, and the chemical structural formula is shown on the bottom right. The method comprises the following processing steps: firstly, the method adopts hydroquinone and phosphorus oxychloride as raw materials and a lewis acid as a catalyst for heating reaction; and secondly, the reaction mixture is heated up and dripped with phenol for reaction by taking the lewis acid as the catalyst. The production method has sufficient supply of the raw materials and simple reaction conditions, can reduce the manufacturing cost, and makes products have obvious price advantage; and simultaneously the material has the characteristics of zero halogen, low smoke, low toxity, low corrosiveness, high heat distortion temperature, good fire resistance, good processability, capability of being recycled, etc., and can be widely used as the fire retardant of various engineering plastics.

The present invention provides improved methods for preparing cetyltrimethylammonium bromide-capped gold nanoparticles through the use of hydroquinone as a reducing agent. Such methods generally comprise the steps of: (1) providing a seed solution comprising a gold nanoparticle; (2) providing an aqueous growth solution comprising: (i) cetyltrimethylammonium bromide, (ii) hydrogen tetrachloroaurate, and (iii) hydroquinone; and (3) adding a quantity of the seed solution to the aqueous growth solution.