46 results about "Hexadecane" patented technology

The invention relates to the field of plasma separation and detection, in particular to a composition for separating plasma and a using method thereof. The composition comprises: a phase change component, which is selected from n-alkanes, which are selected from at least one of n-tetradecane, n-pentadecane, n-hexadecane, n-heptadecane, n-octadecane, n-nonadecane, n-eicosane, n-heneicosane or n-docosane; a liquid phase carrier component, wherein the liquid phase carrier component is selected from silicone oil; the structural framework and rheology regulation and control component comprises fumed silica, and the structural framework and rheology regulation and control component comprises fumed silica; the dispersion and stabilization auxiliary agent component is selected from at least one of TiO2 and BaSO4, the density adjusting filler component is selected from at least one of TiO2 and BaSO4, and the dispersion and stabilization auxiliary agent component comprises a silane coupling agent. According to the device, plasma and blood cells can be reliably, rapidly and effectively separated only through one-time low-temperature centrifugation, and remixing caused by transportation jolting can be avoided.

The invention discloses a core-shell structure P (MMA-MBA) copolymer heat-storage phase-change microcapsule, the microstructure is of a spherical structure, the core-shell structure is adopted, the core structure is hexadecane, the shell structure is a methyl methacrylate (MMA) and N, N-methylene bisacrylamide (MBA) copolymer, the emulsifier is lauryl sodium sulfate (SDS), the initiator is potassium persulfate, and the pH value of the core-shell structure P (MMA-MBA) copolymer heat-storage phase-change microcapsule is 7-8. And the coating efficiency is 70-75%. The preparation method comprises the following steps: 1, preparing an oil phase and a water phase; and 2, polymerization reaction of the microcapsule. A phase change cement material based on a core-shell structure P (MMA-MBA) copolymer heat storage phase change microcapsule is prepared by compounding the P (MMA-MBA) copolymer heat storage phase change microcapsule and a cement matrix, and has hydrophobicity; obvious weightlessness exists in two times.

The application belongs to the technical field of zinc ion batteries, and provides a water-based zinc ion battery electrolyte, a preparation method thereof and a water-based zinc ion battery. The application provides a water-based zinc ion battery electrolyte comprising the following components: a water-soluble zinc salt 1-2.5 mol / L, an additive 1-6 g / L and water; the additive is 4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8,8,8]hexacosane, and the pH value of the water-based zinc ion battery electrolyte is less than or equal to 1. The additive of the application is preferentially adsorbed on the surface of the zinc negative electrode instead of water molecules, and generates a thin and dense solid-state protective layer in situ, which has good ion conductivity and is electron-insulating. The solid-state protective layer is like a raincoat for the zinc negative electrode, which prevents water molecules from reacting with the zinc negative electrode, and at the same time, the tertiary amine ions formed by the ionization of the bridging crown ether shield the corrosion of hydrogen ions on the zinc negative electrode under strong acid conditions.

This invention relates to the field of microbial fermentation, specifically to a method for promoting the fermentation of Bacillus atrophaeus to produce γ-polyglutamic acid (PGA) using oxygen carriers. This invention involves adding specific alkane oxygen carriers during the initial stage of γ-PGA production via Bacillus atrophaeus NWS-01 fermentation. Hexane, heptane, and hexadecane were selected as effective oxygen carriers, and the optimal single-addition concentration and optimal synergistic addition ratio of each oxygen carrier were determined. This solves the problem of limited γ-PGA yield due to low oxygen transfer efficiency in traditional fermentation processes. Specifically, adding 0.3% heptane alone achieves a γ-PGA yield of 39.4 ± 0.19 g / L, while the synergistic addition of 0.240% hexane, 0.407% heptane, and 1.014% hexadecane results in a maximum yield of 42.1 g / L, representing a 150.6% increase compared to the fermentation system without added oxygen carriers. This method is simple to operate, has high oxygen utilization, low energy consumption, and produces fewer bubbles and lower liquid shear force in the fermentation system, making it suitable for the industrial-scale aerobic high-density fermentation production of γ-PGA.

The invention belongs to the technical field of zinc ion batteries, and provides an aqueous zinc ion battery electrolyte, a preparation method thereof and an aqueous zinc ion battery. The invention provides an aqueous zinc ion battery electrolyte. The aqueous zinc ion battery electrolyte comprises the following components: 1-2.5 mol / L of water-soluble zinc salt, 1-6g / L of an additive and water, the additive is 4, 7, 13, 21, 24-hexaoxa-1, 10-diazabicyclo [8, 8, 8] hexacodecane, and the pH value of the aqueous zinc ion battery electrolyte is less than or equal to 1. The additive is adsorbed on the surface of the zinc negative electrode prior to water molecules, and a thin and compact solid protective layer with good ionic conductivity and electronic insulation is generated in situ. The solid protective layer looks like a'raincoat 'for the zinc negative electrode to prevent the action of water molecules and the zinc negative electrode, and at the same time, the corrosion of hydrogen ions to the zinc negative electrode under strong acid conditions is shielded by tertiary amine ions formed by ionization of tertiary amine in the bridge crown ether.

The invention belongs to the technical field of preparation of nano composite materials, and particularly relates to a melt-blending nano-dispersed cellulose nanocrystal modified polylactic acid composite film material and a preparation method of the melt-blending nano-dispersed cellulose nanocrystal modified polylactic acid composite film material. Comprising polylactic acid and hexadecane modified cellulose nanocrystals, and the addition amount of the hexadecane modified cellulose nanocrystals is 1%-5% of the mass of the polylactic acid. The preparation method comprises the following steps: activating cellulose nanocrystals by adopting sodium hydroxide, and then adding halogenated hexadecane for reaction to obtain the hexadecane modified cellulose nanocrystals. Through surface hydrophobization green modification, agglomeration caused by drying is avoided, the interfacial compatibility with PLA and other hydrophobic polymers is enhanced, and nano dispersion of cellulose nanocrystal powder in a polylactic acid matrix is achieved through shear force in melt processing and melt fluidity of cetane macromolecules. Therefore, crystallization and heat resistance of polylactic acid are improved.

The present invention relates to a synergistic composition for the treatment of disorders related to central nervous system (CNS) excitability. The synergistic composition comprises combination of GABA receptor agonists and synaptic plasticity enhancer or salts thereof along with pharmaceutically acceptable excipients. The GABA receptor agonists are selected from the group consisting of 4-[(2R)-2,4-Dihydroxy-3,3-dimethylbutanamido]butanoic acid, 4- (Pyridine-3-carbonylamino)butanoic acid and 4-(hexadecanoylamino)butanoic acid or salts thereof. The synaptic plasticity enhancer are selected from magnesium 2- acetamidoethanesulfonate, magnesium bis (2-aminoethane-1-sulfonate), magnesium;(2S,3R)- 2,3,4-trihydroxybutanoate, N-(2-Hydroxyethyl)hexadecanamide, 1-(4-aminobutyl)guanidine and 5'-inosinic acid or salts thereof.

The invention discloses a preparation method of isohexadecane solvent naphtha, which comprises the following steps: treating a raw material isohexadecane mixture by a feed adsorption tank and a feed filter, feeding into a feed buffer tank, boosting by a hydrogenation feed pump, mixing with recycle hydrogen, exchanging heat with reaction generated oil, and feeding into a pre-hydrogenation reactor; a pre-hydrogenation reaction product is mixed with high-pressure circulating oil and circulating hydrogen, is subjected to heat exchange with reaction generated oil, is fed into a hydrofining reactor, is subjected to heat exchange, is cooled, and is fed into a high-pressure separator; the reaction generated oil and the hydrogenation generated oil at the bottom of the high-pressure separator are sent to a product separation tower after components are removed by a light component removal tower; the product separation tower is provided with a side stream stripping tower, isohexadecane solvent oil is extracted from the bottom of the side stream stripping tower, and byproducts such as isododecane solvent oil and isoeicosane solvent oil are extracted from the top and the bottom of the separation tower respectively. The method prolongs the service life of the catalyst and the operation cycle of the device, reduces the operation energy consumption of the device, reduces the carbon emission and saves the investment.

A modified waste clay synthetic super-hydrophobic thermal management composite coating, a preparation method thereof, one part of waste clay powder is subjected to carbonization treatment in a tube furnace; one part of waste clay powder is subjected to air-burning oxidation treatment in a tube furnace; two parts of waste clay powder are respectively added into a mixed solution of hexadecane trimethyl siloxane, tetraethyl silicate, ammonia and ethanol for hydrophobic treatment to obtain a dispersion; the dispersion is subjected to centrifugal, washing and drying treatment in sequence to obtain modified waste clay powder after oxidation and carbonization; two surfaces of a substrate are sequentially subjected to washing, drying and plasma treatment; the waste clay powder after oxidation and carbonization is mixed with resin and curing agent respectively, and then added into a solvent for stirring treatment and ultrasonic oscillation treatment to prepare a spray coating; the spray coating is sprayed on two surfaces of the prepared substrate respectively, and a modified waste clay synthetic super-hydrophobic thermal management composite coating is obtained after curing. The composite coating prepared by the method can significantly reduce energy consumption in heating and cooling.

The invention provides a phase-change self-repairing lightweight aggregate concrete material and a preparation method thereof.The method comprises the steps that 1, phase-change self-repairing lightweight aggregates prepared from hexadecane, dodecanol, decanoic acid, lauric acid, tetradecanoic acid and a repairing agent are mixed according to the mass ratio of 1: 1: 1: 1: 1, and composite phase-change self-repairing lightweight aggregates are obtained; secondly, the shale pottery sand is pre-wetted to reach a saturated surface dry state; 3, uniformly dry-mixing silica fume, cement, fly ash, floating beads and nano-silica in a concrete mixer to obtain a primarily mixed dry material; 4, adding composite phase change self-repairing lightweight aggregate, 50% of water, 50% of an additive and 50% of carbon fibers into the primarily mixed dry material, and uniformly stirring to obtain a medium mixed material; and 5, adding shale pottery sand, 50% of water, 50% of an additive and 50% of carbon fibers into the medium mixture, and uniformly stirring to obtain the phase-change self-repairing lightweight aggregate concrete.

The application discloses a long-acting makeup holding foundation liquid, which comprises water, titanium dioxide, hydrogenated polydecene, isododecane, isohexadecane, dimethicone, caprylic acid / capric acid triglyceride, dipropylene glycol, silica, polyglyceryl-2 dipolyhydroxystearate, synthetic fluorphlogopite, polymethylsilsesquioxane, a film forming agent, magnesium sulfate, cetyl PEG / PPG-10 / 1 dimethicone, lithium montmorillonite, triethoxysilane, ethanol, dimethicone / vinyl dimethicone crosspolymer, alumina, dimethiconol, collagen, natural extract, a colorant, a moisturizing agent and trace additives. The long-acting makeup holding foundation liquid has reliable water supplementing and moisturizing and oil control effects, can selectively absorb and control oil, has reliable skin friendliness, can reliably protect makeup of oily skin, and avoids the problem of makeup removal caused by facial oil secretion.

The invention discloses a preparation method and application of an aromatic dicarboxylic acid-terbium complex fluorescent sensor array. The fluorescent sensor array comprises three fluorescent probes, the terbium complexes are respectively a 5-methoxy isophthalic acid-terbium complex, a 5-hexadecyloxy isophthalic acid-terbium complex and a 5-(6 '-cholesterol) hexyloxy isophthalic acid-terbium complex, and the preparation method comprises the following steps: (1) dissolving an aromatic dicarboxylic acid ligand in DMSO (dimethylsulfoxide) to obtain an aromatic dicarboxylic acid ligand mother solution; dissolving a terbium source in distilled water to obtain terbium ion mother liquor; and (2) adding the terbium ion mother liquor into an HEPES buffer solution, adding an aromatic dicarboxylic acid ligand mother liquor into the HEPES buffer solution, and carrying out constant-temperature reaction at 30-40 DEG C for 40-95 minutes to obtain the aromatic dicarboxylic acid-terbium complex. The fluorescent sensor array can be used for detecting tetracycline, cefixime, chloramphenicol and ciprofloxacin, and is high in accuracy and sensitive.

The invention belongs to the technical field of high polymer materials, and particularly relates to a rubber label containing an epoxy group agglomerated siloxane microsphere emulsion and a preparation method thereof.The preparation method comprises the steps that S1, sodium dodecyl sulfate, sodium bicarbonate and sodium dihydrogen phosphate serve as raw materials to prepare a water phase, modified silane, n-hexadecane and azodiisobutyronitrile serve as raw materials to prepare an oil phase, and the oil phase is prepared into an oil phase; carrying out emulsification treatment on the water phase and the oil phase to obtain a miniemulsion, and carrying out polymerization reaction on the miniemulsion to obtain an epoxy group-containing agglomerated siloxane microsphere emulsion; s2, polyol, isocyanate, a chain extender, 1, 4-butanediol and stannous octoate are used as raw materials to prepare a prepolymer; and S3, adding the epoxy group-containing agglomerated siloxane microsphere emulsion into the prepolymer for stirring reaction, and then pouring into a mold for molding to obtain the rubber label containing the epoxy group-containing agglomerated siloxane microsphere emulsion. The hardness and heat resistance of the material are effectively improved, and good flame retardant property is obtained.

The invention provides a marine fungus-derived petroleum degrading enzyme, a gene A6006 and application thereof, belongs to the crossing field of biological enzyme technology and environmental remediation, and provides the marine fungus-derived petroleum degrading enzyme, the amino acid sequence of which is shown as SEQ ID NO.2. The gene A6006 of the marine fungus-derived petroleum degrading enzyme has the advantages that the gene A6006 of the marine fungus-derived petroleum degrading enzyme has the advantages that the gene A6006 of the marine fungus-derived petroleum degrading enzyme has the advantages that the gene A6006 of the marine fungus-derived petroleum degrading enzyme can be used for degrading petroleum; the nucleotide sequence of the gene after being optimized by an escherichia coli codon is shown as SEQ ID NO. 1; the marine fungus-derived petroleum degrading enzyme provided by the invention can degrade dodecane, tridecane, tetradecane, pentadecane, hexadecane, heptadecane, octadecane, hexadecanoic acid, naphthalene, phenanthrene and pyrene; and the degradation effect on tetradecane, hexadecane and naphthalene is better.

This invention relates to the field of coating technology, and proposes an aerogel anti-condensation coating and its preparation method. An aerogel anti-condensation coating comprises the following raw materials in parts by weight: 40-60 parts of elastic silicone-acrylic emulsion, 5-7 parts of aerogel, 10-12 parts of polyurethane acrylic resin, 5-10 parts of silica, 5-10 parts of heat-insulating filler, 2-3 parts of film-forming aid, 1-1.5 parts of dispersant, 0.5-1 part of defoamer, 1-2 parts of thickener, and 30-40 parts of water; the heat-insulating filler has a core-shell structure, consisting of a core material and a shell material; the shell material comprises the following raw materials in parts by weight: 9-11 parts of melamine and 7-9 parts of formaldehyde aqueous solution; the core material comprises the following raw materials in parts by weight: 6-8 parts of white oil, 7-9 parts of hexadecane, and 5-7 parts of microcrystalline wax. This technical solution solves the problem of poor heat insulation performance in aerogel anti-condensation coatings in related technologies.

To provide a taste-modifying composition that reduces the saltiness of sodium salts, such as sodium bicarbonate; the use of such a taste-modifying composition to reduce the saltiness of sodium salts; and a composition (such as an edible composition or an oral care composition) comprising a sodium salt and a taste-modifying composition. [Solution] below: (a) Glucosylated natural steviol glycoside; (b) 4-amino-5,6-dimethylthieno[2,3-d]pyrimidine-2(1H)-one or a salt thereof; (c) sucralose; and (d) Oxacyclohexadecane-2-one A taste-modifying composition comprising two or more combinations of the following.

The invention relates to the technical field of cosmetics, in particular to a PDRN water-in-oil preparation, a preparation method of the PDRN water-in-oil preparation and cosmetics. The PDRN water-in-oil system which is high in stability, good in ductility and good in skin feeling experience is obtained by optimizing the variety and the concentration of the water-phase salt and adjusting the variety and the relative proportion of the oil-phase composition. The preparation is prepared from the following raw materials: water, PDRN, sodium citrate, 1, 2-hexanediol, polyol, isohexadecane, isononyl isononanoate, a vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane cross-linked polymer, polydimethylsiloxane, octyl polytrimethylsiloxane, an emulsifying agent and a preservative. Experiments show that the PDRN keeps good dispersity and activity in the water-in-oil system, and has good stability. In addition, the PDRN water-in-oil preparation prepared by the invention has good ductility, and is smooth and easy to push away when being smeared.

The invention discloses an industrial preparation method of metafluzamide, which comprises the following steps: step S1, reacting 4-aminopyridazine with bromoethane in the presence of a catalyst 4, 7, 13, 16, 21, 24-hexaoxo-1, 10-diazabicyclo [8.8. 8] hexacodecane and an acid binding agent to obtain N-ethylpyridazine-4-amine, and step S2, reacting 4-aminopyridazine with bromoethane in the presence of a catalyst 4, 7, 13, 16, 21, 24-hexaoxo-1, 10-diazabicyclo [8.8. 8] hexacodecane to obtain N-ethylpyridazine-4-amine; s2, reacting methyl isopropyl ketone with hydrazine hydrate to obtain 3-methylbutyl-2-subunit hydrazine, carrying out reduction reaction on the 3-methylbutyl-2-subunit hydrazine to obtain 3-hydrazino-2-methyl butane, and carrying out cyclization reaction on the 3-hydrazino-2-methyl butane and the compound as shown in the formula 1 in the presence of formic acid to obtain a compound as shown in a formula 2; s3, enabling the N-ethylpyridazine-4-amine to react with the compound shown in the formula 2 under the catalytic action of 2, 2, 2-trifluoroethanol, so as to obtain the metafluzamide. According to the present invention, the method has characteristics of simple steps, easily available raw materials, mild reaction conditions and high total yield, and is suitable for industrial production.

The present disclosure provides advantageous sheet stabilized emulsion based inks, and improved methods for fabricating and using such inks. More particularly, the present disclosure provides improved methods for fabricating conductive inks derived from water-in-oil emulsions stabilized by sheets exfoliated from layered materials (e.g., substantially pristine and non-oxidized graphite or hexagonal boron nitride), and related methods of use. A layered material (e.g., substantially pristine and non-oxidized graphite or hexagonal boron nitride) can be exfoliated into individual sheets, and these sheets can be utilized to stabilize water-in-oil emulsions. In certain embodiments, by utilizing long chain alkanes (e.g., hexadecane), one can advantageously fabricate emulsions with high viscosity and stability. In this form, the emulsions can be used as inks, thereby advantageously providing an inexpensive route to printing electrically conducting and / or insulating lines and shapes.

The invention relates to a method for producing [ 18 F]SiTATE, encompassing the following steps (a) Providing an eluent solution prepared by dissolving 4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8.8.8]hexacosane and potassium oxalate in a solvent; (b) Winning [ 18 [F]Fluoride anions using the eluent solution to obtain a solution, [ 18 [F]Fluoride anions contains; (c) Removal of the solvent leaving a residue which[ 18 [F] Fluoride anions contain; and (d) Converting the residue with [ 19 F]SiTATE in an organic solvent to obtain [ 18 F]SiTATE.

The application discloses a kind of self-cleaning wear-resistant UV light curing coating and its preparation method and application.The raw material composition of self-cleaning wear-resistant UV light curing coating includes, by weight parts, acrylate resin 20-95 parts, active diluent 10-60 parts, photoinitiator 0.1-5 parts, solvent 1-20 parts, perfluoropolyether modified long fluorine side chain polyurethane acrylate 0.1-10 parts, leveling agent 0.1-0.5 parts.Perfluoropolyether modified long fluorine side chain polyurethane acrylate gives UV light curing coating excellent hydrophobic and oleophobic, anti-graffiti, anti-fingerprint, smoothness, low refractive and wear-resistant properties, realizes long-term protection of coating surface.The coating surface formed by self-cleaning wear-resistant UV light curing coating has water contact angle not less than 110°, n-hexadecane static oil contact angle not less than 65°, with good antifouling property, fingerprint wiping property, wear resistance.

The invention relates to the technical field of drug analysis and detection, in particular to a method for detecting an NOTA-P137 intermediate 2 and an isomer thereof. The detection method comprises the following steps: detecting by adopting a high performance liquid chromatography; the NOTA-P137 intermediate 2 is 9-benzyl 13, 16-di-tert-butyl (9S, 13S)-3, 11, 16-trioxo-1-phenyl-2-oxa-4, 10, 12, 15-tetraaza hexadecane-9, 13, 16-tricarboxylate, the NOTA-P137 intermediate 2 is 9-benzyl 13, 16-di-tert-butyl (9S, 13S)-3, 11, 16-trioxo-1-phenyl-2-oxa-4, 10, 12, 15-tetraaza hexadecane-9 Wherein the chromatographic conditions are as follows: a chromatographic column is a polysaccharide derivative bonding type chiral chromatographic column; n-hexane and / or n-heptane is used as a mobile phase A, and ethanol and / or isopropanol is used as a mobile phase B; carrying out isocratic elution by adopting a mobile phase A and a mobile phase B; the invention provides a separation and detection method which is accurate, stable, reliable and high in sensitivity, and has important significance on quality research and control of the INR101 injection.

The invention relates to the technical field of catalysis, and discloses application of a Cu-ZSM-22 catalyst in preparation of aviation kerosene components through hydrodeoxygenation coupling isomerization of methyl palmitate, and the application comprises the following steps: 1) carrying out reduction treatment on the Cu-ZSM-22 catalyst; 2) filling a reactor with the Cu-ZSM-22 catalyst, mixing methyl palmitate and a solvent, introducing hydrogen, and carrying out hydrodeoxygenation and hydroisomerization reaction to obtain a product containing hexadecane and an isocompound thereof; according to the Cu-ZSM-22 catalyst, a ZSM-22 molecular sieve is used as a carrier, and a copper species is used as an active component. The catalyst is used for preparing aviation kerosene components through methyl palmitate hydrodeoxygenation coupling isomerization, has the advantages of being low in cost, high in methyl palmitate conversion rate, high in long-chain alkane selectivity, high in product isomerization ratio and the like, and can effectively improve the low-temperature fluidity of the aviation kerosene components.

According to one embodiment, there is provided an after-cure type thermoforming laminate layered a base material layer, an uncured hard coat layer and a protective film in this order, wherein, after removing the protective film and curing the hard coat layer, the surface free energy of the surface of the hard coat layer is 20.0 mJ / m2 or less, and the surface free energy is calculated from the values of the average contact angle of water and the average contact angle of hexadecane on the surface of the hard coat layer based on a Kaelble-Uy method.

A method for preparing a bowl-shaped microgel belongs to the field of microgel technology. The specific steps of the preparation method are as follows: 1. Solution preparation: Weigh cetyl polyethylene glycol / polypropylene glycol-10 / 1 dimethylsiloxane (EM 90) and hexadecane to prepare a hexadecane solution containing EM 90; weigh PEGDA, LAP, and polysaccharides to prepare an aqueous solution containing PEGDA, LAP, and polysaccharides; 2. Microdroplet preparation; 3. Microgel preparation; 4. Microgel washing. The oil and surfactant used in this invention are inexpensive and readily available, and the preparation method is simple, avoiding the changes in the microgel matrix caused by the osmotic pressure of the aqueous two-phase phase during the phase separation process in microgels based on the phase separation principle. By incorporating polysaccharides to adjust the composition and structure of the microgel prepolymer solution, bowl-shaped microgels with different matrices can be obtained. The microgels prepared by this invention are expected to be used for disease diagnosis and treatment.

The application provides a super-hydrophobic self-cleaning aluminum alloy coating and a preparation method thereof, and belongs to the technical field of super-hydrophobic material preparation. The SiO2 / CuO composite particles with a core-shell structure are prepared by using a hydrothermal method, then the SiO2 / CuO composite particles are modified by using hexadecyl trimethoxysilane, and are sprayed on the surface of a substrate to obtain a super-hydrophobic self-cleaning coating with photocatalytic capacity. The preparation method is simple, no chemicals are used except for ethanol and a small amount of hexadecyl trimethoxysilane, the prepared coating has photocatalytic antibacterial capacity, and the coating surface shows good super-hydrophobicity and excellent corrosion resistance to water, acid and alkali.

This invention relates to the field of cetylpyridinium chloride synthesis technology, specifically an optimized synthesis process for cetylpyridinium chloride, comprising the following steps: S1: Pyridine and excess hexadecane chloride are mixed with water, and zinc halide catalyst is added to carry out a first-stage reaction to obtain a first-stage product; S2: An alkali is dissolved in water and added to the first-stage product to carry out a second-stage reaction to obtain a second-stage product; S3: A nickel salt is dissolved in water and added to the second-stage product to carry out a third-stage reaction to obtain crude cetylpyridinium chloride. The process of this invention uses excess hexadecane chloride, which ensures that pyridine reacts almost completely. The main impurities remaining are hexadecyl alcohol and hydrogen chloride. The residual pyridine content in the product is controlled at an extremely low level and can be purified and removed using more environmentally friendly and safe solvents such as water and ethanol. Simultaneously, because pyridine is used as the limiting reactant, the conversion rate decrease caused by hexadecane chloride is suppressed, thus the yield of this process is high.

The present application belongs to the field of textile chemistry and dyeing and finishing engineering, and particularly relates to a kind of flame-retardant viscose fiber and its alkane medium circulation dyeing method.The method comprises the following steps: S1, alkali pretreatment step: the flame-retardant viscose fiber is immersed in the alkali solution with a concentration of 10-20 g / L for treatment, S2, dyeing step: the flame-retardant viscose fiber treated in S1 is placed in a dyeing system containing isohexadecane and reactive dyes for dyeing, the amount of isohexadecane is 40-60 mL / g fiber, S3, soaping step;S4, medium circulation step.The present application solves the technical problems of the existing reactive dye water bath dyeing process applied to flame-retardant viscose fiber, such as the decline of fiber flame-retardant performance due to strong alkali conditions, the serious pollution of a large amount of high-salinity wastewater, and the difficulty in recycling water medium.

The invention provides a marine fungus-derived petroleum degrading enzyme, a gene A5124 and application thereof, belongs to the crossing field of biological enzyme technology and environmental remediation, and provides the marine fungus-derived petroleum degrading enzyme, the amino acid sequence of which is shown as SEQ ID NO.2. The gene A5124 of the marine fungus-derived petroleum degrading enzyme has the advantages that the gene A5124 of the marine fungus-derived petroleum degrading enzyme has the advantages that the gene A5124 of the marine fungus-derived petroleum degrading enzyme has an amino acid sequence shown as SEQ ID NO.2; the nucleotide sequence of the gene optimized by an escherichia coli codon is as shown in SEQ IN NO. 1; the marine fungus-derived petroleum degrading enzyme provided by the invention can degrade dodecane, tridecane, tetradecane, pentadecane, hexadecane, heptadecane, octadecane, hexadecanoic acid, naphthalene, phenanthrene and pyrene; and the degradation effect on tetradecane, hexadecane, phenanthrene and pyrene is better.