90 results about "4-Hydroxybenzaldehyde" patented technology

The invention relates to a corrosion-inhibition drag reducer for alkyl porphyrin compound natural gas pipelines of and a preparation method of the corrosion-inhibition drag reducer. The preparation method comprises the steps as follows: firstly, benzaldehyde, 4-hydroxyl benzaldehyde and pyrrole are used as raw materials to be reacted so as to prepare the mixture of six kinds of porphyrin compounds (H); then, the mixture H of the porphyrin compounds is reacted with acrylic acid long-chain alkyl esters to prepare six kinds of alkyl orphyrin compounds, wherein each kind of the compounds is 15 to 20wt%; and the prepared compounds are dissolved in 30 to 50wt% of solvent prepared with p-dioxane so as to form the corrosion-inhibition type drag reducer for the alkyl porphyrin compound natural gas pipelines. The proportion is that the mole ratio of methanal to the 4-hydroxyl benzaldehyde is (0.8:1) to (1.2:1); the mole ratio of the benzaldehyde to the pyrrole is (0.8:2) to (1.2:2); and the mole ratio of the acrylic acid long-chain alkyl esters to the pyrrole synthetizing H is (1:1) to (2:1). The drag reducer provided by the invention has the advantages of good drag reduction and anticorrosion property.

The present invention relates to oral care compositions comprising stannous ions, a mint-type flavor oil, a protectant component that prevents generation of off odor and off taste in the composition, and orally acceptable carriers. The mint-type oils include peppermint, spearmint and corn mint. Suitable protectant components include copper salts and carbonyl compounds such as ascorbic acid; cis-jasmone; 2,5-dimethyl-4-hydroxy-3(2H)-furanone; 5-ethyl-3-hydroxy-4-methyl-2(5H)-furanone; vanillin; ethyl vanillin; anisaldehyde; 3,4-methylenedioxybenzaldehyde; 3,4-dimethoxybenzaldehyde; 4-hydroxybenzaldehyde; 2-methyoxybenzaldehyde; 4-methoxybenzaldehyde; benzaldehyde; cinnamaldehyde (3-phenyl-2-propenal); hexyl cinnamaldehyde; α-methyl cinnamaldehyde; ortho-methoxy cinnamaldehyde; α-amyl cinnamaldehyde; and combinations thereof. The oral care composition may be a dentifrice.

The invention discloses a method for manufacturing a dendritic fluorescent chemosensor and the method for detecting Fe<3+> in a sample. The method for manufacturing the dendritic fluorescent chemosensor is mainly technically characterized by comprising the following steps of: performing reaction on aminoacetaldehyde dimethyl acetal, methyl acrylate and ethylenediamine in a methanol medium under the protection of argon at the temperature of 55 to 65 DEG C for 24 to 30 h to obtain a dendritic compound; and reacting in darkness the dendritic compound with rhodamine B hydrazide in the methanol medium under the protection of the argon at room temperature for 48 to 58 h by taking 4-hydroxybenzaldehyde as a crosslinker, and performing filtration and washing to obtain the dendritic fluorescent chemosensor. In the detection method, the mixed solution of ethanol and water serves as the medium, and the Fe<3+> content of various samples is determined by utilizing a fluorophotometer in Tris-HCl buffer solution with the pH value of 6.8 to 7.5. The dendritic fluorescent chemosensor has the linear range of 0 to 10.0 mu g.mL<-1>, the detection limit of 0.026 mu g.mL<-1>, and sensitivity and selectivity which are valuable in analytical chemistry.

The invention provides a method for synthesizing 7-Acetyleno quinone methide compounds that is safe and inexpensive. The method avoids the need for extremely cold reaction temperatures and unlike the prior art does not require any highly explosive materials. The method comprises the steps of:a) performing a condensation reaction between 3,5-di-tert-butyl-4-hydroxybenzaldehyde and a secondary amine thereby forming a secondary amine quinone methide intermediate;b) removing water from the secondary amine quinone methide intermediate by azeotropic distillation;c) adding the dehydrated secondary amine quinone methide intermediate to an organic medium containing a metal acetylide to form a Mannich base intermediate; andd) adding a release agent to the Mannich base intermediate to yield a 7-Acetyleno quinone methide.

The invention relates to the technical field of organic synthesis, and particularly discloses a synthesis method of isoliquiritigenin. According to the synthesis method of isoliquiritigenin, 2,4-hydroxyacetophenone and 4-hydroxybenzaldehyde are used as raw materials, and the product namely isoliquiritigenin can be obtained through hydroxyl protection, aldol condensation and hydroxyl deprotection reaction. The synthesis method of isoliquiritigenin, provided by the invention, is simple and easy to implement, mild in reaction conditions, safe, reliable, high in raw material availability, low in price and low in cost, adopts at least one of dimethyl tert-butyl chlorosilane and triisopropyl chlorosilane to protect 4-hydroxyl groups of 4-hydroxybenzaldehyde and 2,4-dihydroxyacetophenone, reducesthe risk of byproduct generation, improves the yield of isoliquiritigenin, and is suitable for industrial production.

The invention discloses a method for synthesizing a phosphorus-containing silicon-containing organic or inorganic internal-hybridized activated monomer and an application. The method comprises the steps of preparing a phosphorus-containing silicon-containing phenol intermediate from 3-aminopropyl triethoxysilane, 4-hydroxybenzaldehyde and DOPO, which serve as raw materials, by utilizing a Kabachnik-Fields reaction, then, subjecting the phenol intermediate and methacryloyl chloride to a reaction in the presence of a solvent and an acid binding agent, and carrying out purification, thereby preparing the active double bond containing phosphorus-silicon organic or inorganic internal-hybridized activated monomer. The synthesized organic / inorganic internal-hybridized activated monomer is accurately controllable in elemental composition and can be applied to preparation of functional organic / inorganic hybridized polymers and flame-retardant, anticorrosive, heat-resistant and weather-resistantmodified materials.

Lubricating oil specially used for a biogas engine and a preparing method thereof are disclosed. The lubricating oil includes phosphite, polyoxyethylene hydrogenated castor oil, phosphoric acid, 2(2-ethoxyethoxy)ethanol, sorbitol, 4-hydroxybenzaldehyde, isodehydro-costuslactone, aerosil, lupenyl palmitate, cross-linked polyvinylpolypyrrolidone, naphthenic oil, butter, a tetra(hydroxyethyl)ammonium swelling oily agent, succinimidyl succinate, boron nitride, glycerin, polyvinylsuccinimide, graphite and amino thio ester. The lubricating oil is developed specially for the biogas engine, and is prepared by adopting a unique formula and a unique processing process. Aiming at internal lubrication of the biogas engine, the lubricating oil ahs characteristics of high-temperature resistance, not liable volatilization and high adhesive force and has popularization and application value.

The invention relates to preparation and an application of a (a)Co(b)Fe(x)M(y)O type multi-phase catalyst for catalyzing oxosynthesis of vanillin (3-methoxy-4-hydroxy benzaldehyde). The (a)Co(b)Fe(x)M(y)O type multi-phase catalyst is prepared by taking cobalt and iron as active ingredients, adding one or more of elements including copper, manganese, zirconium, cerium, niobium, nickel, bismuth, lanthanum and the like for serving as cocatalyst(s), taking an alkaline solution as a precipitant and adopting a coprecipitation method. The vanillin is prepared by the following steps of: dissolving 3-methoxy-4-hydroxy salicylic alcohol into a methanol solution of an alkali metal hydroxide; adding a catalyst; putting a reaction liquid into a high-pressure kettle; charging oxygen or air in a heating state; efficiently finishing an oxidation reaction; separating simply; and neutralizing. The transformation ratio of the 3-methoxy-4-hydroxy salicylic alcohol is over 94 percent, the selectivity of the vanillin is up to 93 percent, and the yield of the vanillin is up to 88 percent. The catalyst is easy to prepare, has low cost, is easy to separate after reacting, and can be used circularly after being simply treated; an high selectivity of the vanillin is kept while high transformation ratio of the 3-methoxy-4-hydroxy salicylic alcohol is ensured. The preparation has the advantages of high product yield, high purity, capability of directly recovering an alcohol solvent, small environmental pollution, low production cost and the like, and has a good application prospect in industrial synthesis of vanillin.