40 results about "N-Octyl Alcohol" patented technology

The invention provides a preparation method of dicapryl carbonate, belongs to the field of preparation of dicapryl carbonate, and can solve the problems of unstable reaction system, low raw material conversion rate, low catalyst efficiency, poor phase contact effect, many side reactions, low product purity and poor quality in the existing preparation method of dicapryl carbonate. The preparation method of dicapryl carbonate comprises the following steps: fully mixing n-caprylic alcohol, a basic catalyst and a cosolvent, continuously dropwise adding low-grade dialkyl carbonate into the mixed solution for 5-10 hours through a liquid material distributor, carrying out ester exchange reaction, continuously extracting low-boiling-point substances, controlling the reflux quantity, and carrying out reduced pressure distillation to obtain the dicapryl carbonate. The method comprises the following steps: adding a cosolvent into a reaction solution, enabling the cosolvent with an initial addition amount to always exist in the reaction solution, after the reaction is finished, dealcoholizing by reduced pressure distillation, and removing impurities by washing to obtain a crude product of dioctyl carbonate, and rectifying to obtain a dioctyl carbonate product. The preparation method is high in raw material conversion rate and high in product yield, and the purity of the obtained product is gt; the content of impurities is low, and the method can be applied to preparation of cosmetics.

The invention discloses octyl vanillate as well as a preparation method and application thereof, and relates to the field of insulating oil additives. According to the invention, vanillic acid and n-caprylic alcohol are subjected to esterification reaction under the action of the bio-enzyme catalyst to synthesize octyl vanillate, and the synthesis method is efficient, green, environment-friendly and low in cost. The prepared octyl vanillate is added into the synthetic ester insulating oil as an antioxidant active component, a long ester chain in the octyl vanillate has high thermal stability, the oxidation of the synthetic ester insulating oil can still be effectively inhibited at high temperature, and the compatibility between the octyl vanillate and the synthetic ester insulating oil is good. Therefore, compared with traditional antioxidants, the synthetic ester insulating oil has remarkable advantages in the aspect of maintaining excellent oxidation resistance and electrical performance of the synthetic ester insulating oil.

The present invention relates to oct-5-en-2-yl acetate, to the use thereof as an aroma chemical, to the use thereof to impart an aroma to a composition, and to a method for imparting an aroma to a composition. The present invention further relates to a mixture comprising oct-5-en-2-yl acetate and 2-octyl acetate, to the use of said mixture as an aroma chemical, to the use of said mixture to impart an aroma to a composition, and to a method for imparting an aroma to a composition. The present invention is also directed to the use of oct-5-en-2-yl acetate for boosting or modifying the aroma of 2-octyl acetate. The present invention is further directed to a composition comprising oct-5-en-2-yl acetate or the mixture of oct-5-en-2-yl acetate and 2-octyl acetate.

The invention relates to a microemulsion type suckercide as well as a preparation method and application thereof, the microemulsion type suckercide comprises the following components in percentage by weight: 30% of mixed ester alcohol component, 10% of absolute ethyl alcohol, 5% of n-butyl alcohol, 25% of emulsifier and 30% of water; the mixed ester alcohol component comprises 36 to 54.6 percent of n-caprylic alcohol, 45 to 63.9 percent of n-decanol and 0.1 to 0.4 percent of dodecanol, and the emulsifier is preferably polyoxyethylene 40 hydrogenated castor oil. The microemulsion type suckercide can be applied as a tobacco suckercide, when the suckercide is applied to tobacco suckercide, the dilution multiple is 8 times, the application method is cup spraying suckercide, and the dosage of the diluted suckercide per plant is 25 mL. The microemulsion type suckercide is green in formula, has an efficient suckercide effect on tobacco, is long in lasting period, does not contain components such as pendimethalin, butralin and flumetralin, and avoids the problem that chemical pesticide residues in tobacco leaves exceed the standard after an existing chemical suckercide is applied.

The present application belongs to the technical field of fermented fruit juice, and particularly relates to a method for preparing high-quality probiotic fermented strawberry juice based on magnetic field assistance. The present application first uses Lactobacillus plantarum CTCF-LP-1 to perform static fermentation on the strawberry juice to be fermented in a fermentation device for more than 24 hours, and then places the fermentation device in a static magnetic field. The static magnetic field reduces the generation of organic acid components by Lactobacillus plantarum during the fermentation process of the strawberry juice, reduces the acidity, and improves the fermentation quality of the strawberry juice. The magnetic field strength of the static magnetic field is 1.0-2.5 mT, and the fermentation time in the static magnetic field is 0.5-1.5 h. After the static fermentation and the magnetic field treatment, the content of malic acid, isocitric acid, glutaconic acid and other organic acid components in the fermented strawberry juice is significantly reduced, while the content of alcohol and ester components such as n-octanol, 2-phenylethanol, methyl benzoate, 3-hexyl hexanoate and butyl valerate is increased, the types of aroma components are more abundant, and the taste and quality of the strawberry juice are significantly improved.

The present invention discloses a collector for flotation desulfurization of calcium-process vanadium extraction tailings and a preparation method thereof, which includes 1-10 parts of octyldecanol polyoxyethylene ether phosphate; 1-10 parts of fatty alcohol polyoxyethylene ether phosphate; 1-10 parts of isomeric tridecanol polyoxyethylene ether; 1-10 parts of alkylphenol polyoxyethylene ether; 1-10 parts of octyldecanol polyoxyethylene ether phosphate; 1-10 parts of isooctanol polyoxyethylene ether phosphate; 1-30 parts of N-cocoyl propanediamine acetate; 1-10 parts of lauroyl glutamate; 1-10 parts of lauroyl sarcosinate; 1-10 parts of cocoyl glycinate; 1-10 parts of coconut oil fatty acid alaninate. Compared with the prior art, the collector of the present invention has a high recovery rate of gypsum products obtained by flotation, low impurity content, high iron and vanadium content and low sulfur content in the iron concentrate remaining after flotation. It has high solubility, good foam fluidity, controllable foam life, environmental friendliness, strong collecting performance, fast flotation rate and shorter flotation time.

The invention discloses a Priesteria gigantea GD0038 and an application thereof in improving the flavor of weed crab sauce. The strain is deposited in the China Center for Type Culture Collection with a deposit number of CCTCC NO: M 20242548 and a deposit date of November 13, 2024. The strain is applied to the preparation of weed crab sauce, can significantly improve the flavor of the weed crab sauce, increase the content of volatile substances in the fermented weed crab sauce, and increase the content of characteristic flavor substances such as 1-penten-3-ol, 1-nonanol, isovaleraldehyde, n-hexanol, n-octanol, 3-n-decanol, 2-heptanone, and other alcohols, pyrazines, and ketones, while reducing the content of unpleasant flavor substances such as butylamine, trimethylamine, and n-hexanal. The invention has very good application prospects.

The invention relates to a quaternary ammonium salt collecting agent for reverse flotation of refractory hematite at room temperature and application of the quaternary ammonium salt collecting agent, the quaternary ammonium salt collecting agent is structurally a cationic compound with an ester group, n-caprylic alcohol and chloroacetic acid react to obtain octyl chloroacetate, and then the octyl chloroacetate reacts with tertiary amine. The molar ratio of n-caprylic alcohol to chloroacetic acid is 1: (1.05-1.15), the reaction temperature is 80-90 DEG C, and the reaction time is 7-9 hours; the molar ratio of the octyl chloroacetate to the tertiary amine compound is 1: (1.1-1.3), the reaction temperature is 70-90 DEG C, and the hematite room-temperature reverse flotation quaternary ammonium salt collecting agent is obtained by reacting in an acetonitrile solvent for 2-6 hours. The quaternary ammonium salt collecting agent with the ester group is independently applied to room-temperature reverse flotation of the refractory hematite.

The invention discloses n-heptanoic acid prepared by oxidizing alcohol and a preparation method of the n-heptanoic acid, sec-octanol is taken as a raw material, a copper oxide-zinc oxide supported catalyst is added into a caustic alkali aqueous solution, reaction is carried out under the conditions that the temperature is 160-240 DEG C and the pressure is 1.0-2 MPa to obtain n-heptanoate, and then the n-heptanoic acid is obtained through acidification. The catalyst is added to promote the dehydrogenation reaction of the octanol and accelerate the reaction rate, so that the problem that the reaction is slow when the reaction temperature is lower than 320 DEG C is solved, by controlling the addition amount of water and the reaction pressure, generation of a 2-methyl-2-octene byproduct caused by dehydration of a system can be prevented, and by adding the defoaming agent, the yield of the 2-methyl-2-octene is increased. The problem of mass transfer difficulty caused by a large amount of foam in the later reaction stage is solved. According to the method disclosed by the invention, the yield of the n-heptanoic acid is more than 70% at 160-240 DEG C, and the method does not need to depend on a large amount of potassium hydroxide and has remarkable industrial advantages.

The invention relates to a tobacco bud inhibitor based on fatty alcohol, which comprises the following components in percentage by weight: 30% of mixed ester alcohol component, 15% of polyoxyethylene 40 hydrogenated castor oil and 55% of absolute ethyl alcohol, the mixed ester alcohol component comprises 35%-54.6% of n-caprylic alcohol, 45%-64.6% of n-decanol and 0.1%-0.4% of dodecanol, the tobacco suckercide is an emulsifiable concentrate suckercide, and the tobacco suckercide effect can reach 80% or above. The tobacco suckercide is reasonable in formula, good in suckercide effect, long in lasting period and free of pendimethalin, butralin, flumetralin and other components, and the problem that after an existing chemical suckercide is applied, tobacco leaf chemical pesticide residues exceed the standard is solved.

The invention discloses a tobacco flavor essence formula, which comprises the following components by weight: 2.4-2.6 g of raw cut tobacco extract, 2.5-3.6 g of tobacco extract and the balance of water. The formula comprises the following components by weight: 0 to 0.06 g of cocoa extract, 0 to 0.3 g of 10% furanone, 0 to 0.15 g of 10% ethyl phenylacetate, 0 to 0.20 g of 10% methyl dihydrojasmonate, 0 to 0.15 g of vanilla concentrated extract, 0 to 0.08 g of 10% eugenol, 0 to 0.03 g of 10% geranium oil, 0 to 0.15 g of 10% n-caprylic alcohol, 0 to 0.15 g of 10% phenethyl alcohol, 0 to 0.04 g of 10% nerol, 0 to 0.06 g of 10% lavender oil, 0 to 0.03 g of 10% linalool and 5.0 to 7.0 g of propylene glycol. The invention further discloses a preparation method and application of the tobacco-flavor essence formula. The formula of the tobacco flavor essence not only can play a role in increasing the original fragrance of tobacco, but also can enrich the smoking taste of smoke.

The invention relates to the technical field of chemical synthesis, in particular to a preparation method of dicapryl carbonate, which at least comprises the following steps: adding n-caprylic alcohol, diethyl carbonate and a basic catalyst into a reaction container for heating reaction; carrying out vacuum reaction after the heating reaction is finished, and carrying out cooling suction filtration after the vacuum reaction is finished to obtain filtrate; according to the method, the reaction temperature is low, the reaction time is short, the problem that the reaction yield is reduced due to raw material loss in the prior art is effectively solved, the yield is increased while the product purity is guaranteed, and the method has extremely high market application value.

This invention belongs to the field of traditional Chinese medicine detection technology, specifically relating to a method for determining the content of multiple components in Bawei Chenxiang San (Eight-Ingredient Agarwood Powder). The method employs gas chromatography to simultaneously determine the content of the main active components in Bawei Chenxiang San: octyl acetate, benzylacetone, myristole, and dehydrocostunolactone. This invention can effectively shorten the analysis time of the main active components in Bawei Chenxiang San, exhibits good linearity, high accuracy, precision, and repeatability, and is stable and feasible, applicable to product quality inspection.

The invention discloses a preparation method of iso-octyl p-methoxycinnamate, which comprises the following steps: mixing iso-octyl acetate, p-methoxybenzaldehyde and a solid catalyst for reaction, and controlling the water content of the iso-octyl acetate to be less than or equal to 0.15% to obtain a reaction material; and carrying out purification treatment on the reaction material to obtain the iso-octyl p-methoxycinnamate product. According to the method disclosed by the invention, in a process for synthesizing iso-octyl p-methoxycinnamate by taking iso-octyl acetate and p-methoxybenzaldehyde as raw materials, the solid catalyst is adopted, so that the introduction of solvents such as alcohols and water is avoided, the occurrence of side reactions is reduced, the content of by-products of the iso-octyl p-methoxycinnamate is reduced, the purification difficulty and cost of the product are reduced, and the yield of the iso-octyl p-methoxycinnamate is increased. And the product purity and yield are improved.

The invention belongs to the field of chemical engineering, and particularly discloses a supported metal catalyst for preparing C8 aliphatic amine, the supported metal catalyst is composed of an active component and a catalyst carrier; the active component is composed of 0-30% of cobalt, 0-5% of copper, 0-4% of magnesium and 0-3% of zinc based on the weight of the supported metal catalyst; and the balance is a catalyst carrier. The invention also provides a method for preparing C8 fatty amine by taking C8 fatty alcohol as a raw material, and the supported metal catalyst is utilized. The supported metal catalyst provided by the invention is suitable for the production of three types of C8 fatty amines, namely n-octylamine prepared from n-octanol, isooctylamine prepared from isooctanol and sec-octylamine prepared from sec-octanol, and has the advantages of high conversion rate, high catalyst activity and long service life.

The invention relates to a knotting type anti-migration low-polyester plasticizer and a preparation method thereof. Main raw materials for synthesizing the plasticizer are terephthalic acid, phthalic acid, furandicarboxylic acid, isophthalic acid, phthalic anhydride, ethylene glycol, butanediol, propylene glycol, diethylene glycol, n-butyl alcohol, isooctyl alcohol, other fatty alcohols and binary acid or anhydride containing a polar structure. An intermediate can be prepared through esterification reaction of dibasic acid and dihydric alcohol, and then fatty alcohol is used for blocking; the compound can also be prepared through one-pot esterification. The key point lies in the control of alcohol-acid ratio and molecular weight. Existing reaction equipment for preparing titanate plasticizers is almost not required to be changed, the reaction time can be effectively shortened, the molecular weight of the obtained novel environment-friendly plasticizer is between that of titanate and that of a polyester plasticizer, the novel environment-friendly plasticizer has better compatibility than the polyester plasticizer and higher lightning than the titanate, and the novel environment-friendly plasticizer is suitable for being used in the field of plasticizers. The volatility is lower; and the migration resistance is more excellent.

The application relates to a compound collector and application thereof in zinc oxide ore flotation, and belongs to the technical field of mineral processing. The compound collector is composed of mixed amine, mixed alcohol, hydrocarbon oil and emulsifier, the mixed amine includes laurylamine and N-dodecyl ethanolamine, the mixed alcohol includes glycerol and n-octanol, the hydrocarbon oil includes kerosene and diesel, and the emulsifier includes sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate and dodecyl phenol polyoxyethylene ether; the zinc oxide ore flotation process includes twice roughing, once scavenging, twice cleaning and once cleaning scavenging, the middlings are not returned to the roughing and cleaning operations, the ore is subjected to crushing, grinding, reagent adding and pulp conditioning, and then is subjected to flotation to obtain zinc concentrate and flotation tailings. The compound collector has high selectivity, high collecting capacity, small flotation foam amount, good fluidity, stable process flow, can avoid the influence of slime on the roughing and cleaning indexes, improves the stability and viscosity of the foam layer, and improves the flotation recovery indexes of the zinc oxide ore.

The invention discloses a continuous rectification separation device for a mixed solution after a reaction for preparing higher alcohol through catalytic conversion of ethanol and an operation method, the continuous rectification separation device mainly comprises eight rectification towers and a set of membrane separation device, and is divided into two parts, namely a light component separation system and a higher alcohol separation system; the method comprises the following steps: by taking substances subjected to catalytic conversion of ethanol as raw materials, firstly removing water, ethanol, n-butanol and other light components through a light component extraction tower, enabling the light components to enter a membrane separation device through heat exchange to remove water, and then separating and recovering ethanol and n-butanol by utilizing a rectifying tower; the tower kettle of the light component extraction tower is connected with a higher alcohol separation system, so that n-hexanol, 2-ethyl butanol, n-caprylic alcohol, 2-ethyl hexanol, n-decanol and 2-ethyl caprylic alcohol are separated one by one; various products can be produced at the same time, the purity of the products can be adjusted according to needs, and the method has the advantages of low energy consumption, high efficiency, good environmental protection benefits and the like.

The invention discloses a sunscreen synergistic composition as well as a preparation method and application thereof, and belongs to the technical field of daily chemicals. The sunscreen synergistic composition comprises a composite light stabilizer and physalis pubescens juice, the composite light stabilizer comprises butyl octanol salicylate, an acrylic acid (ester) copolymer, 2, 6-diethyl hexyl naphthalate and caprylic / capric triglyceride. The compound light stabilizer obtained by compounding butyl octanol salicylate, acrylic acid (ester) copolymer, 2, 6-diethyl hexyl naphthalate and caprylic / capric triglyceride can improve the conversion rate of the sun-screening agent; energy generated by the sun-screening agent capable of absorbing light in an excited state can be removed through an energy transfer and / or electron transfer quenching mechanism, and photodegradation and formation of reactive oxygen free radicals are reduced; the physalis pubescens juice is added and compounded with the compound light stabilizer, so that the light absorption capacity of the sun-screening agent is improved, the sun-screening value is further increased, meanwhile, skin problems are reduced, and heat damage is reduced.

The invention relates to the technical field of intelligent monitoring, in particular to a tea tree disease and insect pest monitoring method based on machine learning fused with a gas sensor array. Volatile substances such as leaf alcohol, phenethyl alcohol, capraldehyde, linalool, farnesene, ocimene, geraniol, n-caprylic alcohol, benzaldehyde and leaf acetate are monitored respectively. By adjusting the working temperature of the sensor, multiple groups of sensor response data are collected, and the data are preprocessed. By comparing the combination of different dimensionality reduction methods and classification models such as a support vector machine and a convolutional neural network, optimizing the model performance by using cross validation and hyper-parameter tuning, selecting an optimal classification model, and in a concentration prediction stage, comparing various regression models respectively, and optimizing the model performance by combining cross validation and hyper-parameter tuning. According to the method, the tea plant diseases and insect pests can be efficiently and accurately monitored, and the method has a wide application prospect.

[Problem] To provide a new fish-attracting composition and fish feed containing the same. [Solution] A fish-attracting composition containing one or more compounds selected from group A.　(Group A) 4-heptenal, 2-nonenal, 2,6-nonadienal, 2,4-decadienal, benzyl alcohol, 1-octanol, 2-ethylhexanol, amyl alcohol, 1-octen-3-ol, ethyl maltol, 2-heptanone, 2-nonanone, 1-octen-3-one, isophorone, homofuraneol, 1,5-octadiene-3-one, cyclotene, γ-butyrolactone, 2-acetyl-3-methylpyrazine, 2,6-dimethoxyphenol, 4-ethylguaiacol, paracresol, 3-ethylphenol, guaiacol, 4-allyl-2,6-dimethoxyphenol, 3-mercapto-2-pentanone

The invention relates to the field of water treatment, and discloses a method for measuring the content of a corrosion and scale inhibitor in a water sample and a method for controlling the concentration of the corrosion and scale inhibitor in a circulating water system. The method comprises the following steps: contacting an extraction agent, a cosolvent and a to-be-detected water sample containing a corrosion and scale inhibitor for extraction, and carrying out first oil-water separation on the obtained mixed solution to obtain an oil phase; wherein the corrosion and scale inhibitor is a polymer containing a sulfonic acid group; the extraction agent is trialkyl tertiary amine, and the carbon atom number of alkyl in the trialkyl tertiary amine is 8-10; the cosolvent is at least one of n-caprylic alcohol, chloroform, carbon tetrachloride, toluene and kerosene; contacting the oil phase with alkali liquor to perform reverse extraction, and then performing second oil-water separation on the obtained mixed liquor to obtain a water phase; and calculating the content c0 of the corrosion and scale inhibitor contained in the water sample to be detected through the formula I. The method can improve the accuracy and precision of content determination of the corrosion and scale inhibitor, so that the concentration of the corrosion and scale inhibitor in a circulating water system is more favorably controlled.

The invention discloses a production device and method for continuous rectification separation of ethanol, n-butanol and higher alcohol, the production device comprises 12 rectification towers, a phase splitter and a heat exchanger, and the method mainly comprises three steps of light component separation, alcohol-water separation and higher alcohol separation; the method comprises the following steps of: removing ethyl acetate, aldehyde and part of ethanol from a raw material which is a mixed solution after a reaction of preparing higher alcohol through catalytic conversion of ethanol, separating light components such as ethanol, water and n-butyl alcohol from an ethyl acetate tower kettle liquid through a light extraction tower, separating the ethanol by utilizing extractive distillation, and adopting a circulating reflux design in subsequent separation of the n-butyl alcohol and the water, the efficient separation of alcohol and water is realized; meanwhile, the tower kettle of the light component extraction tower is connected with a higher alcohol separation system, and 2-ethyl butanol, n-hexanol, 2-ethyl hexanol, n-caprylic alcohol, 2-ethyl caprylic alcohol and n-decanol are separated one by one; various products can be produced at the same time, energy consumption is low, benefits are high, the resource utilization rate is high, and the trend of green chemical engineering and sustainable development is met.

The invention discloses a method for synthesizing n-octylamine from n-caprylic alcohol. According to the method, hydrogen serves as a hydrogen source, ammonia gas serves as an ammonia source, the chromium-zinc-modified aluminum oxide loaded nickel-copper catalyst is used for catalyzing amination of n-caprylic alcohol to selectively prepare primary amine, the conversion rate of n-caprylic alcohol and the selectivity of n-caprylic amine can reach the high level at the normal pressure and the reaction temperature of 180-200 DEG C, and wide application prospects are achieved.

The invention provides bacillus safensis and application of the bacillus safensis. The bacillus safensis disclosed by the invention is preserved in the China General Microbiological Culture Collection Center, and the preservation number is CGMCC (China General Microbiological Culture Collection Center) No.30643. The rhodiola rosea flavor for the cigarettes is prepared through fermentation of the strain, the content of effective active ingredients including gallic acid, salidroside, rhodiola crenulata, rhodioloside and tyrosol in rhodiola rosea is increased, the medicinal value of the active ingredients of the rhodiola rosea is greatly protected, and the health-care effect of the rhodiola rosea is guaranteed and improved; moreover, the contents of aromatic substances such as n-caprylic alcohol, linalool, phenethyl alcohol, citronellol and geraniol are increased. The cigarette flavoring sensory evaluation shows that the cigarette flavor is harmonious and unique in fragrance, has a strong effect on fragrance such as faint scent and green fragrance in smoke style characteristics, makes a certain contribution to flower fragrance, radix aucklandiae and sweet fragrance, and has the effects of improving the cigarette fragrance amount, softening and smoothing smoke and reducing throat irritation.

The invention belongs to the technical field of manganese compound preparation methods, and particularly relates to a method for preparing battery-grade manganese carbonate by using waste manganese liquid. The method comprises the steps of pretreatment of waste manganese liquid, extraction separation, reverse extraction recovery and preparation of manganese carbonate. According to the core technology, a ternary compound organic extraction system composed of di (2-ethylhexyl) phosphoric acid (P204), sec-octyl alcohol and trioctyl phosphate (TOPO) or N-octyl pyridone (NOP) is adopted, in the system, P204 serves as a main extraction agent and is matched with a synergistic ligand TOPO or NOP to enhance the selectivity, a diluent sec-octyl alcohol is used for improving the compatibility, co-extraction of impurity ions such as Fe < 3 + > and Cu < 2 + > can be remarkably inhibited through the synergistic effect of P204, sec-octyl alcohol and the like, and the extraction efficiency is improved. And the manganese extraction purity and efficiency are improved. After two-stage countercurrent reverse extraction treatment, manganese ions are enriched in a water phase, and manganese carbonate crystals with uniform particle size and relatively high purity are prepared through a sodium carbonate precipitation method. The method realizes high-value recovery of valuable metals in the waste liquid, is green and efficient in process, and is suitable for waste battery recovery and battery material manufacturing industry.

The invention discloses 4-octyl ester fumaric acid as well as a preparation method and application thereof. According to the invention, a new member 4-octyl ester fumaric acid is added for the research of fumaric acid derivatives. The method comprises the following steps: dissolving maleic anhydride and n-caprylic alcohol in ethyl acetate, and reacting at 90-100 DEG C for 10-20 hours to synthesize 4-octyl fumaric acid. The anti-inflammatory effect of the novel derivative 4-octyl fumaric acid is stronger than that of dimethyl fumarate.

The application relates to the technical field of edible essence. The application discloses a guava essence and a preparation method thereof. Raw material composition of the guava essence comprises the following components: ethyl maltol, methyl cinnamate, trans-2-hexenal, ethyl dihydro mairetin, benzaldehyde, phenethyl alcohol, propyl decanolactone, eugenol, peach aldehyde, propionic syriac wood ester, methyl benzoate, hexyl acetate, hexanal propylene glycol acetal, secondary octanol, acetic leaf alcohol ester, syriac wood acetate, butyric acid leaf alcohol ester, phenethyl acetate, lauryl acetate, ethyl acetate, ethyl butyrate, trans-2-hexenal propylene glycol acetal, benzaldehyde propylene glycol acetal, thiomenthone, propylene glycol, antioxidant, and soybean phospholipid. The prepared guava essence not only has natural guava flavor, but also can improve the taste of products, has high thermal stability, and has a long shelf life.

The invention relates to the field of glue preparation, in particular to a high-strength glue preparation system and method.The high-strength glue preparation method comprises the following steps that S1, water and polyvinyl alcohol are added into a mixing device, raw materials are made to flow back and forth to be fully stirred and mixed till the polyvinyl alcohol is completely dissolved, and a mixed solution A is obtained; s2, under the stirring condition, adding part of the emulsifier into the mixed solution A, then slowly adding vinyl acetate and an initiator, and continuously stirring to obtain a mixed solution B; s3, after the mixed solution B is cooled, adding sodium bicarbonate, dibutyl phthalate, diethylene glycol dibenzoate, octanol and isopropanol under a stirring condition, and uniformly mixing to obtain a mixed solution C; and S4, adding the residual emulsifier, allyl methacrylate, glycol dimethacrylate and toluene diisocynate into the mixed solution C, uniformly stirring and mixing, preserving heat at 45 DEG C, and cooling to room temperature to obtain the high-strength glue. The mixing device is used for enabling raw materials to flow back and forth to be fully stirred and mixed.

The invention discloses a method for removing beta-cyclodextrin impurities in an alpha-cyclodextrin production process, which comprises the following steps: screening out methyl tert-butyl ether, n-caprylic alcohol, n-hexane and other assistants which have strong inclusion force with alpha-cyclodextrin, and introducing the assistants in a purification stage after conversion. The separation pertinence is improved, and the auxiliary consumption is reduced; the conversion stage and the purification stage are separately regulated and controlled, and the types and dosages of auxiliaries can be flexibly adjusted according to the composition of the cyclodextrin mixture in the purification stage, so that the product stability is ensured.