61 results about "Heptadecane" patented technology

The invention discloses a method for producing long-chain alpha,omega-dicarboxylic acid by fermenting and converting an n-alkane with microbes, particularly a method for producing high-yield heptadecanedioic acid, which comprises the following steps: inoculating seed liquor, which is cultured from a Candida tropicalis mutant strain ly-7 which is obtained by mutagenesis by an N<+> injection technique and subjected to oxidase activity screening and culture, into mixed liquor of an n-alkane and a fermentation medium; fermenting and converting at 25-32 DEG C for 48-168 hours; and separating and purifying the generated long-chain alpha,omega-dicarboxylic acid. When n-heptadecane is fermented and converted to produce the heptadecanedioic acid in a 5-ton fermentation tank for 144 hours, the content of the heptadecanedioic acid can reach 163 g / l.

The invention discloses a preparation method of a clay-based composite phase-change energy storage deicing (snow melting) material. The preparation method is characterized in that a composite phase-change energy storage material is prepared from a low-temperature organic phase-change material and a clay material, wherein the low-temperature organic phase-change material is prepared by single-element or multi-element mixing of various organic phase-change materials and is then physically compounded with the treated clay to prepare the clay-based composite phase-change energy storage deicing (snow melting) material. The low-temperature organic phase-change material is selected from polyethylene glycol-300, polyethylene glycol-400, polyethylene glycol-500, polyethylene glycol-600, decyl alcohol, undecanol, dodecanol, heptylic acid, octanoic acid, nonanoic acid, capric acid, methyl laurate, methyl myristate, methyl palmitate, tetradecane, pentadecane, hexadecane, heptadecane, octodecane, nonadecane and the like. The clay material is selected from kaolinite, montmorillonite, bentonite, vermiculite, halloysite, sepiolite, attapulgite, perlite, diatomite, rectorite, zeolite, silicon dioxide, dolomite, calcite and illite. The prepared composite phase-change energy storage deicing (snow melting) material is proper in phase-change temperature (0-5 DEG C), high in phase-change latent heat and high in heat stability.

The invention discloses a method for measuring safrole in mainstream smoke of cigarettes. The method comprises the steps of preparation of an internal standard solution, a standard working solution and a sample solution, gas chromatography-tandem mass spectrometry analysis, calculation of measurement results and the like. According to the invention, N-heptadecane is used as an internal standard substance for quantifying, the optimized detection method is extremely sensitive in response and accurate in quantitative analysis and effectively reduces the interference caused by complex sample matrix; the adopted chromatography and mass spectrometry conditions enable the target substance to have good signal response and good linear correlation, the detection limit is 0.015ng / cigarette, the relative standard deviation (RSD) is 6.35%, and the adding standard recovery is 87.78-110.9%, thus the method is high in sensitivity, good in repeatability and high in recovery rate and is suitable for quantitative analysis of the safrole serving as a trace target substance in the complex matrix of the smoke.

The invention belongs to the technical field of green pesticides, and discloses a novel method for synthesizing (R)-cacopsylla pyricola sex pheromone. The method comprises the steps: by taking n-tetradecanoic acid 1 as an initial raw material, firstly reacting with oxalyl chloride to generate n-tetradecanoyl chloride, and then reacting with (R)-4-benzyl-2-oxazolidinone to generate oxazolidinone amide 2; reacting with CH3I in the presence of NaHMDS to generate oxazolidinone amide 3 with one or more methyl groups, and reducing the oxazolidinone amide 3 into chiral alcohol 4 through sodium borohydride; carrying out bromination, and reacting with PPh3 to generate quaternary phosphonium salt 6; and finally carrying out Wittig reaction and catalytic hydrogenation to prepare the (R)-cacopsylla pyricola sex pheromone, namely (R)-13-methylheptacosanoic acid. The chiral methyl is constructed by using an Evans chiral induction method, and the method has the advantages of simple synthetic route, mild reaction conditions, easiness in amplification and the like.

A paraffin-based latent heat storage material composition is provided which has a melting point close to the melting point of n-heptadecane and has a high latent heat of fusion. The paraffin-based latent heat storage material composition of the present invention substantially includes n-octadecane, and n-hexadecane and / or n-heptadecane. The paraffin-based latent heat storage material composition contains not less than 76% by mass of n-octadecane, not more than 23% by mass of n-hexadecane, and not more than 23% by mass of n-heptadecane (the total of the three is set to 100% by mass) and has a melting point lower than that of n-octadecane and latent heat of fusion of 210 J / g or more.

The invention discloses an effective part of a cheezheng pain relieving plaster, a preparation method therefor and characteristic chemical composition. Efficacy of an external preparation prepared from the effective part is better than that of an original preparation. Adverse effects of existing preparations are overcome, namely, the effective part has no sensitization side effects. The effective part contains the following 9 kinds of chemical ingredients at the same time, and the chemical ingredients are phenethyl alcohol, phenylpyruvic acid, calamenene, 1,4-dimethyl-2,5-diisopropyl benzene, atractylol, eudesmol, heptadecane, 2,6,10-trimethyl dodecane and eicosane. The effective part can be prepared into external preparations of an ointment, an emplastrum, a poultice, a spray, a liniment and the like with supplement of pharmaceutically common auxiliary materials.

The invention provides a drug sustained-release material and an application of the drug sustained-release material for treating proctitis. An outer layer of a composition is prepared by tannic acid, 3, 4, 5-trihydroxybenzoic acid, deoxyadenylic acid modified gelatin, polyethylene glycol, polyvinyl alcohol and the like; a middle layer is a drug sustained-release layer taking poly epsilon-caprolactone and polylactic acid as chain segments, and an inner layer is condensed silica gel modified by 1H, 1H, 2H, 2H-perfluoroheptadecane trimethoxysilane and N-2-(aminoethyl)-3-aminopropyltrimethoxysilane. The drug sustained-release composition has good adhesion performance for treating pathological organs such as intracavitary mucosas such as proctitis and the like which are difficult to administrate. The rectal drug sustained-release material composition provided by the invention has good elasticity and interface bonding strength, good biocompatibility, and no toxicity or harm to human body. Thecomposition is capable of improving the interface bonding force between different layers is wide in application range and can be applied to a series of multi-layer materials to improve the interfacebonding force.

The invention provides a channelling sealing system, a preparation method and application thereof. The channelling sealing system comprises a first sub-channelling sealing system and a second sub-channelling sealing system. By weight, the first sub-channelling sealing system comprises the following raw materials: 0.05-0.35 part of Na2SO3, 0.2-0.5 part of cationic polyacrylamide, 0.1-0.5 part of polyoxyethylene ether, 0.2-1.0 part of oil sludge, 0.05-0.3 part of a phenolic resin crosslinking agent, 0.05-0.1 part of C6H4(NH2)2 and 100 parts of water; by weight, the second sub-channelling sealingsystem comprises the following raw materials: 1.0-3.0 parts of heptadecyl dimethyl betaine, 0.01-0.1 part of fatty acid diethanol amide, 0.5-1.5 parts of polyoxyethylene fatty acid amide and 100 parts of water. The channelling sealing system provided by the invention has a series of advantages of high viscosity, good temperature resistance, excellent bubble performance and the like, and can effectively realize deep plugging of volcanic rock stratum.

The invention discloses an aroma composition extracted from spring orchids and an extraction method thereof. The composition includes octadecatrienal, nerolidol, dibutyl phthalate, heptacosanol , Pentadecanoic acid, hexadecanoic acid (palmitic acid), oleic acid, linoleic acid and cyclohexadecane were extracted by leaching and filtering, reflux leaching, filtering, merging and separation, volatile separation, concentration and drying steps, and successfully The aroma substance has been extracted from the flowers of Chunlan, the most important thing is that the main aroma substance octadecatrienal has been found, and the extraction rate of the aroma substance of the present invention is also relatively high. Octatrienal and nerolidol are the main components of the fragrance, and their content is almost 30%. The composition of the present invention has met the basic requirements of natural fragrances, and can be used in fragrances, perfumes, fragrances, etc. according to existing methods. In fragrance body and bath products, this natural "orchid fragrance" can be applied in industry.

The invention relates to a method for separating ginkgolic acid monomers in total ginkgolic acid extracts by high-speed countercurrent chromatography. In the technical solution, silver nitrate is added to a two-phase solvent, and silver ion complexation is introduced. The two-phase solvent system For n-heptane / ethyl acetate / methanol / acetic acid. The method of the invention can separate ginkgolic acid, ginkgolic acid, heptadecanadiene ginkgolic acid, hydrogenated gingkoic acid, heptadecanone ginkgolic acid, five high-purity ginkgolic acid monomer compounds at one time, and the preparation method is simple and convenient High efficiency, cost-effective, suitable for industrial production, has important economic significance.