177 results about "N-Propyl alcohol" patented technology

The present invention belongs to the field of biological engineering technology, in particular, it relates to a method for extracting and separating 1,3-propanediol from fermented liquor. It includes the following steps: directly distilling and concentrating fermented liquor with bacteria to 1 / 2-1 / 20 of original volume, cooling, adding ethyl alcohol or methyl alcohol, n-propyl alcohol, isopropyl alcohol, acetone or butanone according to volume ratio of 1:0.3-1:5, settling or filtering or 1000-4500 rpm centrifugal separation and precipitation, taking supernatant fluid, then using alcohol or ketone to wash and precipitating, then settling or filtering or 1000-1500 rpm centrifugal separation and precipitation, taking supernatant fluid, then recovering alcohol or ketone from said supernatant fluid by means of distillation or rectification.

The invention discloses a method for continuously extracting, rectifying and separating mixed alcohols from water, relates to a chemical separating method, and in particular to a method for continuously extracting, rectifying and separating mixed alcohols such as aqueous mixtures of ethanol, n-propyl alcohol, isobutyl alcohol and the like. According to the method, extractive distillation and common rectifying are combined together, and a multi-column combined step-by-step separating method is adopted to separate mixed alcohols from water step by step and recycle components with high purity. The method comprises steps of: with ethylene glycol as an extraction agent, separating the mixed alcohols from water in an extractive rectifying column B1, wherein the column B1 adopts normal pressure rectification, the reflux ratio is 1:1-10:1, the mixed alcohols can be get from the column top, and a mixture of a solvent and water can be get from the column bottom; recovering most of the solvent from a solvent recovering column B4 and recycling the solvent; and effectively separating the mixed alcohols through columns B2 and B3. According to the method, extractive distillation and common rectifying are combined together, the extraction agent is used to avoid the azeotrope of alcohols and water, and continuous separation of multiple columns are adopted to recover the components with high purity step by step, so that the method has high economic and environmental benefits.

The invention provides a preparation method of a proton exchange film fuel cell film electrode. Pt / C catalyst layers are coated on two sides of a proton exchange film respectively to obtain a CCM filmsemi-finished product, and anti-reverse pole slurry layers are coated on peripheral edges of anode surfaces of the CCM film semi-finished product; the preparation process of the anti-reverse pole slurry specifically comprises steps of adding an antipole substance into deionized water, uniformly mixing the mixture to form mixed solution, adding mixed solution of organic solvent and proton exchangefilm resin solution into the mixed solution, and uniformly mixing the mixture to obtain anti-reverse pole slurry; the solid content of the anti-reverse pole slurry is controlled to be 1-4%, the anti-reverse pole substance is one or more of iridium, rubidium, tin, cobalt metal and metal oxide thereof, and the organic solvent is one or more of ethanol, isopropanol, tert-butyl alcohol and n-propyl alcohol. The method is simple in process, can reduce the probability of occurrence of a reverse pole phenomenon of a fuel cell in the operation process, and reduces a perforation phenomenon.

The invention relates to Saccharopolyspora and a method for producing erythromycin by fermenting the Saccharopolyspora. The depositary institution of Saccharopolyspora erythraea HD03 is the common microbe center of China microbial culture preservation commission; the preservation code is GMCC No.2916; the method comprises the following specific steps that: a block with area of 1 cm*1 cm or a glycerin tube is dug from the preservation bevel and is inoculated into a sterilized seed culture medium; the temperature is between 32 and 34 DEG C; the rotational speed of a rocking bed is between 220 and 240 revolutions / minute; the time for cultivation is between 44 and 48 hours; subsequently, the block or the glycerin with 3 to 10 percent of inoculation amount is inoculated in a sterilized fermentation medium; the temperature is between 32 and 34 DEG C; the rotational speed of the rocking bed is between 220 and 240 revolutions / minute; the time for cultivation is 6 to 7 days; n-propyl alcohol as a precursor is added into the fermentation medium at 20 to 24 hours; and at late stage of fermentation, a methylation reagent and a hydroxylation reagent are added into the fermentation medium to obtain the erythromycin. The method has the advantages that: in the fermentation process, the addition of the methylation reagent and the hydroxylation reagent improves the methylation action and the hydroxylation action of the precursor in the process of synthesizing the erythromycin, reduces the accumulation of byproducts and improves the yield of main products.

The invention relates to a technological method for preparing 1, 3-propylene glycol by adopting glycerin and hydrogen. A catalyst is Pt / B2O3-WO3-ZrO2, and the mass ratio of elements of Pt, B, W and Zr is (1-4): (0.1-2): 10: (58-65); and glycerin and hydrogen are fed into a fixed bed reactor simultaneously and react at the temperature ranging from 100 DEG C to 150 DEG C under the pressure ranging from 2 MPa to 5 MPa, the resultants of reaction are subjected to gas-liquid separation, water in a liquid-phase product is separated and removed by a pervaporation membrane, a rectifying tower is used for separation, 1,3-propylene glycol, by-products containing 1,2-propylene glycol, normal propyl alcohol and isopropyl alcohol and non-converted glycerin are obtained, glycerin and a part of the by-products are circularly returned to the reactor, and the mass ratio of the circulation volume of the by-products to feeding glycerin is 0.25-1.5. According to the technological method, the reaction condition is temperate, the producing speed of 1, 3-propylene glycol is high, and 1, 3-propylene glycol can be prepared stably.

The invention discloses a COF (covalent organic framework) coated separator as well as a preparation method and an application thereof. The method comprises the following steps: firstly, synthesizingTPB-DMTP-COF, then sufficiently mixing the TPB-DMTP-COF, conductive carbon black and a water-based binder in the mass ratio being 6:2:2, dropwise adding 2-3 ml of an n-propyl alcohol aqueous solutioncontaining n-propyl alcohol and water in a volume ratio being 3:1, uniformly mixing the substances, applying the obtained mixture to a ceramic separator, and drying the separator in a vacuum drying oven at 55 DEG C to obtain the TPB-DMTP-COF coated separator by baking. The separator can effectively inhibit a shuttle effect and be prevented from being pierced by lithium dendrites when applied to alithium-selenium sulfide battery, cyclic stability and specific capacity of the battery are improved, the capacity can still be kept at 690 mAh / g after 100 cycles under the current density of 0.5C (1C=1124 mAh / g), electrochemical performance of the battery is improved greatly, and the preparation method adopts a simple process and is high in applicability.

The invention relates to a method for preparing lactic acid n-propyl ester with low water content, low acidity and high purity, which is an alcohol ester preparation method belonging to the field of synthesis of fine organic chemicals. The method comprises the following steps of: adding lactic acid, n-propyl alcohol, a water-carrying agent and an esterification catalyst in the mass ratio of 90:(30-300):(45-450):(0.1-50) into a reactor, and reflux-reacting for 0.5-24 h; in situ removing water and low-boiling acid in an azeotropic mixture which is a water-carrying agent in an external circulating water-separating device by using the reactivity of anhydrous magnesium sulfate, anhydrous sodium sulfate and anhydrous zinc sulfate or calcium oxide with water; and removing a little amount of lactic acid remained in reacted material through the salification between an organic amine mixture and the lactic acid remained in the reacted material, wherein the organic amine mixture comprises ethylamine, diethylamine, triethylamine, propylamine, dipropyl amine and tripropyl amine in the mass ratio of (0.001-5):(0.001-8):(0.003-6):(0.0001-7):(0.001-10):(0.003-3). After being treated by an activated 4A and / or 5A molecular sieve, the lactic acid n-propyl ester product has the ester content more than 98.5 percent, the water content less than 0.1 percent, and the acidity (represented by OH<->) less than 0.5.

The invention relates to a refining method and device for n-propyl acetate esterification synthesis. The refining method comprises the following steps: feeding a crude product obtained in an n-propyl acetate reaction section into an esterification tower, performing preliminary separation on the n-propyl acetate in the esterification tower through a rectifying mode, and evaporating out raw ester consisting of the n-propyl acetate, water and part of n-propyl alcohol from the tower top of the esterification tower; after condensing the raw ester through a tower-top condenser, feeding the condensed raw ester into a tower-top layering machine for layering, refluxing a lower-layer water-phase part to an esterification tower, completely extracting and feeding an upper-layer organic phase into a pervaporation membrane separator to perform separation, so as to obtain dehydrated raw ester; enabling water and a little n-propyl acetate in a solution at a feed liquid side to penetrate through the pervaporation membrane in the form of steam, so as to obtain a penetrating fluid, and returning the penetrating fluid to tower-top layering machine of the esterification tower and discharging the layered penetrating fluid from the water phase; re-feeding the dehydrated raw ester into a refining tower to obtain a n-propyl acetate finished product. According to the refining method, the recovery rate is high, the process is simple, the safety coefficient is high, the feed liquid circulation volume is small, the operation energy consumption is low, and a third component is not added.

The invention discloses gravure printing ink for a poly(ethylene terephthalate) (PET) base material and a preparation method for the gravure printing ink, and aims to provide ink having the advantages of good fluidity, high adhesion, high gloss, simple and feasible preparation method, safe use and environment friendliness, and a preparation method thereof. The ink comprises the following components: an organic pigment or an inorganic pigment, resin, an adhesion promoter, a dispersing agent and the balance of organic mixed solvent. The ink is prepared by the following steps of: mixing dimethyl carbonate, ethyl acetate and n-propyl alcohol to obtain a mixed solvent, and dissolving the resin; and mixing with the organic pigment or the inorganic pigment, stirring and dispersing to obtain a semi-finished product of color paste, fully grinding on a sand mill, adding the adhesion promoter and the dispersing agent, fully stirring, and filtering off components of which the fineness is more than 15mu m by using a filtering machine to obtain the gravure printing ink for the PET base material.

The invention relates to a method for detecting the contents of 22 kinds of volatile organic compounds in cigarette tipping paper printing ink, including benzene, toluene, ethylbenzene, ortho / meta / para-xylene, phenethylene, methanol, ethanol, isopropyl alcohol, n-propyl alcohol, n-butanol, acetone, 4-methyl-2-pentanone, butanone, cyclohexanone, ethyl acetate, n-propyl acetate, n-butyl acetate, isopropyl acetate, 1-methoxy-2-propyl alcohol and 1-ethoxy-2-propyl alcohol. Detection is performed by headspace gas chromatography by taking glyceryl triacetate as a matrix rectifier. According to the method provided by the invention, a sample pretreatment process is simple, the automation degree of the whole operation is high, the simultaneous detection of various volatile organic compounds can be realized, and the detection sensitivity, the recovery rate and the result precision are high.

The present invention provides a composition for water-removable ink with an effect of coupling retardation by using an aliphatic alcohol as a solvent, which is selected from a group comprising n-butyl alcohol, n-propyl alcohol, isopropyl alcohol and pentanol, so that the curiosity of infants or juveniles can be stimulated to enhance the learning effect and also various desires of students or adults can be satisfied in terms of ornamental purposes.

The invention discloses a method for removing and enriching ginkgolic acid from ginkgo biloba extract. The method comprises the following steps: carrying out column filling by taking a molecularly imprinted polymer of ginkgolic acid as column chromatography packing; then filling the column with a ginkgo biloba extracting solution; leaching the column with a mixed solution of cyclohexane and ethyl alcohol in a volume ratio of 10 to 1; finally, eluting the chromatographic column with alcohol so as to obtain an effluent, namely ginkgolic acid, wherein the alcohol can be of ethyl alcohol, isopropanol, n-propyl alcohol or n-butyl alcohol. A molecular imprinting technique is applied to the removal of ginkgolic acid during ginkgo biloba processing for the first time, so that compared with the traditional ginkgolic acid removal method, according to the method disclosed by the invention, ginkgolic acid with high purity is prepared while ginkgolic acid is removed by virtue of the directional enrichment effect of the molecularly imprinted-solid phase extraction column, thereby providing the source of a raw material for clinical pharmacological research on ginkgolic acid.

The invention relates to a process and system for treating industrial normal propyl alcohol waste liquor, belonging to the chemical engineering field. The system carries out extractive distillation to the industrial normal propyl alcohol waste liquor via a azeotropic distillation dividing wall column which is formed by vertically arranging a dividing wall extending from the column bottom to the column top in a conventional distillation column, wherein the dividing wall divides the column internal space into three sections (a common distillation section, a side stripping section, and a dewatering section). By adapting the inventive system and process, anhydrous normal propyl alcohol and butanol can be obtained from the column bottom, water can be purified, and noncondensable gas can be secondarily condensed at the column top for low-temperature condensing-recovering. The process can realize the functions of a normal propyl alcohol concentration column, a dewatering column, a entrainer recovering column in only one column thereby cutting out a distillation column and a condenser, further, the azeotropic distillation dividing wall column can avoid the back mixing effect occurring in normal process, and has high thermodynamics efficiency in the process, so that the energy consumption and equipment invest can be greatly reduced, and economic benefit can be improved.

The invention relates to an environment-friendly cleaning agent. The environment-friendly cleaning agent comprises the raw materials of, by amount, 94%-95% of n-propyl bromide, 3%-4% of n-propyl alcohol, 0.2% of nitromethane, 0.8% of 1,3-dioxolame, 0.7% of epoxybutane and 0.3% of BHT. The cleaning agent has the advantages of low ozone destructive index, low earth warming effect, good environment-friendly effect, high penetration, easily cleaning capacity for micro-porous materials, fast drying speed, low hydrolysis degree, stable gas-liquid phase change, etc. The cleaning agent can be used for steam washing and distillation recovery.

The invention relates to a synthesis technique for high-purity C*S mineral, water is added into ethyl orthosilicate for hydrolysis, n-propyl alcohol and Ca(No3)2 aqueous solution are mixed with hydrolyzed ethyl orthosilicate to form even solution, under the action of nitric acid as a catalyst, the solution is stirred and reacted to obtain sol, and gel is gradually formed and then calcined to obtain C3S mineral after evaporation drying. The C3S mineral, which is synthesized by using the inventive technique, can be found in X-ray diffraction pattern by means of diffraction analysis of X-ray that the characteristic peak of C3S is extremely obvious and peak strength is high, but the characteristic peak of C2S and f-CaO is quite weak and unobvious. Therefore, the C3S mineral which is synthesized by using the inventive technique has high purity. By comparing standard powder diffraction fiche (PDF fiche), it is found that the resultant high-purity C3S phase is the closest to a monoclinic system.

The present invention relates to a high-temperature organic acid corrosion inhibitor for inhibiting refinery vacuum tower high-temperature naphthenic acid corrosion environment with 200-400deg.C. Its composition includes (by wt%) 10-60% of corrosion inhibitor intermediate obtained by using boric acid and organic amine according to the mole ratio of 1:0.5-3 through a certain reaction process, 20-80% of monohydric alcohol or dihydric alcohol solvent formed from one kind and two kinds of methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, butyl alcohol, isobutyl alcohol, 1,2-propylene glycol, n-amyl alcohol, n-heptyl alcohol and n-caprylic alcohol or combination of more than two kinds of above-mentioned components and 0.1-20% of corrosion inhibition film-forming component formed from one kind or any two kinds of sulfourea, benzyl chloride, alkylene sulfide, propiolic alcohol, trisodium phosphate, ammonium phosphosulfate, diammonium phosphate, triammonium phosphate and benzotriazole or combination of more than two kind of above-mentioned all the components.

The invention discloses a detection method of residual stress, and particularly relates to detection on a plastics product. The detection method comprises the steps of immersing a product to be detected in a corrosion solution, and taking the product to be detected out and detecting whether a residual stress reaction occurs when the immersing time reaches an immersing time set value, wherein if the residual stress reaction does not occur, the product to be detected is qualified. The corrosion solution can be prepared by mixing carbon tetrachloride and normal octane according to the volume ratio of 1:1, or by mixing methylbenzene and normal propyl alcohol according to the volume ratio of 1:3; the immersing time is obtained by processing immersing time within which the stress reaction occurs during pre-detection on products in the same batch, and under the residual stress reaction, the surface of a plastic product cracks or powdery particulate materials are formed on the surface of the plastic product due to corrosion.

A method for manufacturing a product containing 2-ethoxylsulfurylaniline derivant belongs to meticulous chemical which is characterized in that having the water, carbinol, ethanol, n-propyl alcohol, lsopropylalcohol, n-butanol, 2-Methyl-1-propanol, dioxane, tetrahydrofuran, dimethyl formamide or their mixture as solvent, adding the 2-ethoxylsulfurylnitrobenzene derivant into solvent, blending and heating to 40-100 DEG C, adding the catalyzer after the reduzate being wholly or partly dissolved, and dripping Hydrazine hydrate; reacting for 0.2-12 hours, filtering to removing the catalyzer while it is hot after finishing the thin-layer chromatography detecting reaction. The products are obtained by three means: (1) decompressing and distilling the filtrate, recovering the solvent, diluting the residual in the cold water or ice water and filtering; (2) directly distilling the solvent from the filtrate; (3) precipitating the product after cooling the filtrate, filtering, and the filtrate being directly applied. The invention has a simple equipment, a convenient operation, a high production yield, a good quality, a high purity and a fine environment friendship.

The invention discloses a preparation method of a fluorine-doped lamellar black titanium dioxide nano material and belongs to the technical field of nano materials. The preparation method comprises the steps of 1) preparing a mixture system of tetrabutyl titanate, n-propyl alcohol and hydrofluoric acid and stirring the system for a certain time; 2) moving the mixed solution to a high-pressure reaction kettle and performing a reaction for a certain time at a certain temperature; 3) washing and drying a reaction product, and heating the reaction product under a protective atmosphere for a certain time to prepare the fluorine-doped lamellar black titanium dioxide nano material. The fluorine-doped lamellar black titanium dioxide nano material, compared with titanium dioxide P25 which has been commercially produced, is more excellent in photo-absorption and electron transmission performances.

Irritant-free gel compositions according to the present invention include less than 5 parts by weight of one or more marking agents, 0.25-2 parts by weight of a thickening agent; and 30-90 parts by weight water. The thickening agent is typically a vegetable gum. In some embodiments, the compositions may additionally include 20-60 parts by weight of at least one water-miscible solvent, such as monohydric alcohols, polyhydric alcohols and mixtures thereof. The water-miscible solvent may be methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, ethylene glycol, propylene glycol or a mixture thereof, and preferably a mixture of isopropyl alcohol and propylene glycol.

The invention discloses an iminazole type ionic liquid reversed phase electrochromatography organic monolithic column. A monolithic stationary phase is a porous continuous bed formed by in situ polymerization of neutral compound and ionic compound monomer; the neutral compound is methacrylic acid dodecyl ester and dimethyl crylic acid ethyl diester, the ionic compound monomer is 1-allyl-3-methylimidazole phosphate ionic liquid, the pore-forming agent is one or more of methyl alcohol, methylbenzene, normal propyl alcohol, cyclohexanol, capryl alcohol, 1,4-butanediol and ethylene glycol, and the initiator is azodiisobutyronitrile. The iminazole type ionic liquid reversed phase electrochromatography organic monolithic column provided by the invention not only has typical reversed phase chromatographic performance, but also can provide ion exchange groups and generate higher electroosmotic flow, change polymerization quantity of ionic liquid and change the size of the electroosmotic flow. The stationary phase of the monolithic column can meet the requirement on rapid separation of polar compound, neutral compound and alkali compound.

The invention provides a synthetic method of drug lamotrigine for curing bipolar disorder and epilepsy. 2-cyano-(2, 3-dichlorophenyl)-2-guanidine amino acetonitrile and n-propyl alcohol (CH3CH2CH2OH) solvent are used as a raw material, and the lamotrigine is generated through one-step cyclization reaction in a reaction tank. The synthetic method of the drug lamotrigine includes material preparation, crude product manufacturing, purification, filtration and drying. The raw material of the synthetic method comprises only the 2-cyano-(2, 3-dichlorophenyl)-2-guanidine amino acetonitrile as a starting material and the n-propyl alcohol (CH3CH2CH2OH) solvent and has no strong acid, strong base and other toxic substances, the lamotrigine is manufactured through the one-step cyclization reaction, and therefore the synthetic method is small in reaction steps, high in yield, simple and convenient to operate and high in raw material utilization rate, avoids using toxic and harmful substances in abundance, reduces production cost remarkably, and has high social benefits and social benefits.

The invention discloses a method for preparing dipropyl carbonate through catalytic synthesis by using alkaline ionic liquid, which is implemented through the steps of: in an inert gas environment, taking the alkaline ionic liquid as a catalyst, after carrying out ester exchange reaction on normal propyl alcohol and dimethyl carbonate, removing methanol and the catalyst in the obtained product, and then collecting colorless liquid fractions (85-90 oC) so as to obtain the dipropyl carbonate, wherein the adopted catalyst is green, environmental-friendly and reusable alkaline ionic liquid which is a 1-butyl-3-methylimidazolium imidazole salt, a 1-butyl-3-methylimidazolium hydroxide or a 1-butyl-3-methylimidazolium acetate. In the method for preparing dipropyl carbonate through catalytic synthesis by using alkaline ionic liquid disclosed by the invention, a product dipropyl carbonate is relatively easy to separate from the catalyst alkaline ionic liquid, the operation process is simple, the reaction conditions are mild, the purity of the product dipropyl carbonate reaches 96-98%, and the yield reaches 46-51%.

The invention relates to a methanol gasoline which comprises 70-80% of methanol, 10-20% of ethanol, 2-5% of n-propyl alcohol, 5-10% of n-butyl alcohol, 2-5% of isopropyl alcohol, 0.05g / L of tert-butyl acetate and 0.016g / L of ferrocene. A production method of the methanol gasoline comprises the following steps of: adding the raw materials into a reaction cylinder in proportion, stirring for 0.5-1h at room temperature by an explosion-proof rod, and standing still for 1h. When in use, the methanol gasoline is mixed with 93# gasoline according to the volume ratio of 1: 1 for use. The methanol gasoline is low in cost and environment-friendly, and reaches the performances and indexes of the 93# standard gasoline, thus having a good market prospect.

The invention discloses a method of determining content of methanol, isobutanol, and isoamylol of alcohol, and relates to methods of determining alcohols. The method of determining the content of the methanol, the isobutanol and the isoamyol of the alcohol comprises steps as below sequentially: (1) alcohol sample pretreatment processing steps: moving sample alcohol into a volumetric flask, adding interior label solution into the volumetric flask, using absolute ethanol to dilute the solution to a constant volume measured by scales, blending the solution to be used as the solution to be tested; (2) blank experiment: adding no samples, and repeating the step (1); (3) carrying out combination analysis of gas chromatography-mass spectra analysis of the samples and the blank sample. The method of determining the content of the methanol, the isobutanol, and the isomylol of the alcohol achieves accurate precise quantification analysis of the content of the methanol, the normal propyl alcohol, the isobutanol and the isoamylol of the alcohol through method improvement and replacing of detectors. The method of determining the content of the methanol, the isobutanol and the isoamylol of the alcohol is simple to operate and fast and accurate.

The invention discloses a method for extracting vanillic acid by using a deep-eutectic solvent / normal propyl alcohol aqueous two-phase system. According to the method, extraction solvents including adeep-eutectic solvent and normal propyl alcohol are mixed to jointly construct the aqueous two-phase system, salts in a conventional aqueous two-phase system are replaced, and the salting-out problemof a salt-containing system is avoided. According to the method, the deep-eutectic solvent and normal propyl alcohol are added into an aqueous solution of vanillic acid to form the aqueous two-phase extraction system with a lower phase rich in the deep-eutectic solvent and an upper phase rich in the normal propyl alcohol, and vanillic acid is extracted into the upper phase. The purpose of enriching and recovering the vanillic acid from the aqueous solution is achieved by utilizing the deep-eutectic solvent / normal propyl alcohol aqueous two-phase system, the deep-eutectic solvent can be recycled, the process is simple, and cost is low.

The invention provides brown sugar essence for food and a preparation method of the brown sugar essence. The brown sugar essence mainly comprises, by weight, 0.4% of furanone, 0.1 of beta-Ionone, 1.4% of beta-damascone, 0.02% of alpha-damascone, 0.02% of methyl furoate, 0.05% of menthol, 0.2% of 5-methyl furfural, 0.02% of glacial acetic acid, 0.04% of 3-hydroxy-2-butanone, 0.02% of 2-heptanone, 0.45% of n-propyl alcohol, 0.025% of acetaldehyde sweet orange oil liquor of 40%, 0.35% of sugar lactone of 3%, 0.25% of n-pentanoic acid, 45% of glycerol and 51.655% of propylene glycol. The volatile fragrance of the whole brown sugar essence is sweet, naturality is high, body fragrance and fullness are achieved, and the base fragrance lasts long. The brown sugar essence can be applied to various kinds of food needing brown sugar flavor and can meet increasing material culture life requirements of people.

The invention relates to a heat exchange medium which is prepared from the following raw materials according to the weight ratio: 20-40 parts of absolute methyl alcohol, 50-70 parts of absolute ethanol and 10-20 parts of absolute n-propyl alcohol. The absolute methyl alcohol, the absolute ethanol and the absolute n-propyl alcohol are mixed as the heat exchange medium. A heat conduction pipe usingthe heat exchange medium comprises a heat dissipation outer pipe, a heat dissipation inner pipe and a heat exchange medium, wherein the heat dissipation inner pipe is arranged in the heat dissipationouter pipe, and the heat exchange medium is filled between the heat dissipation outer pipe and the heat dissipation inner pipe. Therefore, the heat conduction pipe having the advantages of energy saving, environmental protection and convenient installation is provided.

The invention discloses a device and a method for producing normal propyl alcohol by utilizing carbon dioxide. The carbon dioxide is adopted as a raw material; the device comprises a raw material mixing unit, a buffer unit, a reaction unit, a waste heat recovery unit, a rapid cooling unit, a compression unit, a separation unit, a PSA unit, a normal propanal production unit and a normal propyl alcohol production unit; the carbon dioxide is utilized for preparing ethylene, carbon monoxide and hydrogen, and the products are used as material supply for downstream normal propanal and normal propyl alcohol production; exhaust gas produced by the process is used as a fuel for evaporate steam, so that not only is the energy consumption requirement of the device met, but also the steam resource is saved, the maximum cyclic utilization of energy is realized, the pollutant emission is reduced, and the environment protection requirement is met; the follow-up process provides the raw material hydrogen for the previous process, so that the conversion rate of the materials is improved, the atmosphere pollution and the energy waste are avoided; the source problem of ethylene, hydrogen and carbon monoxide raw materials for a downstream device is solved, the product diversification of the enterprise is perfected, and the core competence of the enterprise is improved.