42 results about "N-Propyl alcohol" patented technology

The invention relates to the technical field of high-entropy compound preparation, in particular to high-entropy ceramic powder and a preparation method and application thereof.The preparation method comprises the following steps that a metal source is dissolved in n-propyl alcohol and mixed to be uniform, and an n-propyl alcohol solution of the metal source is obtained; adding acetylacetone into the n-propyl alcohol solution of the metal source, and uniformly mixing to obtain a polymer solution of the metal source; sequentially adding a carbon source and a boron source into the polymer solution of the metal source, and uniformly mixing to obtain a precursor solution; sequentially carrying out curing and heat treatment on the precursor solution to obtain high-entropy ceramic powder; wherein the molecular formula of the high-entropy ceramic powder is MB2, and M is four metal elements of Ta, Nb, Zr and Ti. According to the preparation method, the uniformity of each element on the molecular scale can be greatly improved, so that the oxygen content of the high-entropy ceramic powder is reduced on the premise of reducing the preparation temperature, and the purity of the product is improved.

The invention relates to the technical field of preparation of iridium trichloride, in particular to a preparation method of high-purity iridium trichloride. Methanol, normal propyl alcohol and the like are added into reaction liquid obtained after ammonium chloroiridate and aqua regia are mixed and dissolved to serve as organic additives for nitrate removal, nitrate reacts with nitrate in the solution to generate gas, and nitrate ions are removed from the solution. Meanwhile, the added organic additives are all alcohol substances which are easy to remove and are extremely easy to volatilize in the subsequent reaction heating process, so that impurities which are difficult to remove cannot be introduced into a reaction system while nitrate is effectively removed, and the purity of a final product can be improved. Organic reducing agents with weak reducibility, such as oxalic acid, citric acid, vitamin C and sulfur dioxide, are used for carrying out reduction reaction, so that iridium powder cannot be separated out in the process of reducing tetravalent iridium, and the purity of trivalent iridium can be ensured. The crystal form of the obtained high-purity iridium trichloride is a beta form, and the purity of the high-purity iridium trichloride is greater than 99.997%.

The invention discloses saccharomyces cerevisiae XJ-YSSCE010-1 with high temperature resistance, high ethanol yield and low fusel oil yield and application of the saccharomyces cerevisiae XJ-YSSCE010-1, and belongs to the technical field of microbial fermentation. The saccharomyces cerevisiae XJ-YSSCE010-1 disclosed by the invention is separated and screened from Maotai-flavor liquor yeast, and is preserved in the China General Microbiological Culture Collection Center (CGMCC), and the preservation number is CGMCC No.31174. The fusel oil comprises the following main components: n-propanol, isobutanol, isoamyl alcohol, phenethyl alcohol and the like, wherein isobutanol and isoamyl alcohol have the highest toxicity. The saccharomyces cerevisiae XJ-YSSCE010-1 disclosed by the invention shows the advantages of high yield of ethanol, low yield of fusel oil and no production of isobutanol and isoamyl alcohol in liquid fermentation and simulated high-temperature stacking fermentation experiments, and the saccharomyces cerevisiae XJ-YSSCE010-1 is applied to preparation of white spirit, so that the production efficiency of the white spirit is improved, and the quality of the white spirit is improved.

The invention relates to a method for separating an n-propyl formate-n-propyl alcohol-water mixture by liquid-liquid phase separation coupling extractive distillation, which comprises the following steps of: dividing a raw material into a water phase and an organic phase by using a phase splitter based on the heterogeneous characteristic of an azeotropic system, and carrying out four-tower operation on a rectifying tower (C1), a rectifying tower (C2), a rectifying tower (C3) and a rectifying tower (C4) to obtain an n-propyl formate-n-propyl alcohol-water mixture. The efficient separation of the n-propyl formate-n-propyl alcohol-water mixture is realized. After separation, the molar fraction of n-propyl formate is greater than 99.99%, the molar fraction of n-propyl alcohol is greater than 99.99%, and the molar fraction of water is greater than 99.99%. The method provided by the invention realizes high-efficiency and low-energy-consumption separation of the n-propyl formate-n-propanol-water azeotropic mixture, and has economic benefits and environmental friendliness.

The invention relates to the technical field of food processing, in particular to a gallic acid derivative as well as a preparation method and application thereof. The preparation method of the propyl gallate comprises the following steps: mixing gallic acid, alcohol and a catalyst, heating to a reaction temperature under a condensation reflux condition, carrying out an esterification reaction, and then carrying out post-treatment to obtain a gallic acid derivative; the alcohol is n-propyl alcohol, and the catalyst is sulfonic acid resin. The gallic acid derivative obtained by the preparation method provided by the invention not only improves the stability of gallic acid, but also enhances the antioxidant activity of gallic acid, and the prepared gallic acid derivative has higher application value in the fields of food, medicine, cosmetic production and the like.

The invention relates to a preparation method of a zirconium-doped organic silicon resin modified epoxy resin-based fireproof coating. The preparation method comprises the following steps: preparing zirconium-doped organic silicon resin from methyltriethoxysilane, phenyltrimethoxysilane, methylphenyldimethoxysilane, dimethyldiethoxysilane, n-butyl alcohol, zirconium n-propoxide, acetylacetone, water and hydrochloric acid; the preparation method comprises the following steps: grafting zirconium-doped organic silicon resin and epoxy resin to synthesize zirconium-doped organic silicon resin modified epoxy resin, and preparing and synthesizing the zirconium-doped organic silicon resin modified epoxy resin based fireproof coating by taking the zirconium-doped organic silicon resin modified epoxy resin as a coating matrix, melamine, ammonium polyphosphate, pentaerythritol and aluminum hydroxide as fillers and a 593 curing agent as a curing aid. The invention has the following effects: after the coating is fired for 2 hours under butane flame (1200-1300 DEG C), the back temperature does not exceed 160 DEG C, and the heat insulation performance is excellent; the total heat release (THR) is as low as 56.97 MJ / m < 2 >, the limit oxygen index value is increased to 33.27%, the flame retardant grade reaches V-0 grade, the total smoke release (TSP) is as low as 6.97 m < 2 >, and the flame retardant and smoke suppression performance is excellent.

The invention provides a method for separating an ethanol-isopropanol-n-propanol mixture and a rectification device, and belongs to the technical field of extractive rectification. According to the method, 1-butyl-3-methylimidazolium tetrafluoroborate [BMIM] [BF4] is adopted as an extraction agent, during extraction and separation by the method, the mass fraction of n-propyl alcohol can reach 99.9%, the mass fraction of ethanol is 99.87%, and the recovery rate of the extraction agent exceeds 99.9%; compared with a common organic extraction agent, the organic extraction agent has a better separation effect, high-purity ethanol and n-propanol can be obtained, and the problem of environmental pollution caused by volatilization of the common organic solvent can be avoided; the method has good application in extraction separation and recycling of an ethanol-isopropanol-n-propanol mixture.

The invention relates to the field of zeolite imidazole framework materials, in particular to a synthesis method of a zeolite imidazole framework material. The synthesis method of the zeolite imidazole framework material comprises the following synthesis steps: taking a water-based cosolvent, adding a zinc salt, stirring, mixing and collecting to obtain a metal salt mixed solution; 2-methylimidazole is dissolved in deionized water and dropwise added into the mixed solution, after stirring reaction, washing treatment and drying are conducted, and a zeolite imidazole framework material is prepared; the water-based cosolvent is prepared by mixing an alcohol solvent and deionized water according to different volume ratios, and the alcohol solvent comprises one of methanol, ethanol, n-propanol and isopropanol. An alcohol-water aqueous cosolvent system is adopted to replace a traditional organic solvent, and the coordination environment of metal ions and ligands is influenced by regulating and controlling the polarity of the solvent and a hydrogen bond network. The introduction of the alcohol solvent can enhance the deprotonation ability of the ligand and promote the metal-ligand coordination balance to move towards the product direction, and the existence of water reduces the toxicity of the system and improves the environmental friendliness.

The invention discloses a preparation method of a water-based intelligent anticorrosive coating, an obtained product and application of the product to steel, nano silica sol, methyltriethoxysilane, normal propyl alcohol and water are mixed, and organosilane sol is obtained; the preparation method comprises the following steps: mixing a zirconium n-propoxide solution, acetylacetone, n-propyl alcohol and water to obtain ZrO2 sol; mixing the organosilane sol and the ZrO2 sol, adding the nano TiO2, the carbon black and the dispersing agent, and performing ultrasonic dispersion and sufficient grinding to obtain the product. The preparation method is simple, the process is simple, and the obtained coating shows excellent corrosion resistance when used on various steel materials.

The invention discloses a detection and analysis method for active substances in bayberry soaked wine, including gas chromatography detection of higher alcohol substances, gas chromatography detection of ester substances and liquid chromatography-tandem mass spectrometry detection of polyphenol substances; wherein the detection of higher alcohol substances includes: (1) using ethanol solution as solvent and 4-methyl-2-pentanol as internal standard, respectively preparing 6 higher alcohol series standard solutions of n-butanol, sec-butanol, isobutanol, n-propanol, active amyl alcohol and isoamyl alcohol with the same internal standard concentration; (2) using 4-methyl-2-pentanol as internal standard, taking a wine sample to be tested to prepare a test solution; (3) using gas chromatography to detect the 6 higher alcohol series standard solutions and the test solution, respectively, and calculating the content of each alcohol in the wine sample to be tested. The method of the invention can provide a basis for the index control of bayberry wine and ensure the flavor and quality of the product.

The invention discloses a method for detecting and analyzing active substances in waxberry soaked wine. The method comprises the following steps: detecting higher alcohol substances by using a gas chromatography method, detecting esters by using a gas chromatography method and detecting polyphenols by using a liquid chromatography-tandem mass spectrometry method. The higher alcohol substance detection comprises the following steps: (1) taking an ethanol solution as a solvent and 4-methyl-2-amyl alcohol as an internal standard substance, and respectively preparing six higher alcohol series standard solutions with the same concentration of the internal standard substance, namely n-butyl alcohol, sec-butyl alcohol, isobutyl alcohol, n-propyl alcohol, active amyl alcohol and isoamyl alcohol; (2) taking 4-methyl-2-pentanol as an internal standard substance, and taking a to-be-detected wine sample to prepare a test solution; and (3) respectively detecting the six higher alcohol series standard solutions and the test solution by adopting a gas chromatographic method, and calculating the content of each alcohol in the wine sample to be detected. The method provided by the invention can provide a basis for index control of the waxberry wine and ensure the flavor and quality of the product.

The invention relates to a preparation method of a catalyst for preparing acetyl n-propanol through catalytic oxidation of 2-methyltetrahydrofuran, and belongs to the technical field of catalyst preparation. The preparation method specifically comprises the following steps: dissolving a vanadium-containing compound serving as a main component of the catalyst and oxalic acid serving as a pore-forming agent into deionized water; heating and hydrolyzing the solution to completely evaporate water to obtain a solid; and roasting the solid in an air atmosphere to obtain the catalyst. The prepared catalyst is a catalyst for catalyzing molecular oxygen to oxidize 2-methyltetrahydrofuran to prepare acetyl n-propanol, and a new route for preparing acetyl n-propanol is realized.

The invention discloses an ethyl acetate-normal propyl alcohol-water pressure swing distillation process based on neural network control, and provides a heat integration three-tower pressure swing distillation process aiming at the problems that a ternary azeotropic system is difficult to separate, high in energy consumption and poor in disturbance rejection capacity in the prior art. The azeotropic composition is changed by adjusting the operating pressure of the high-pressure tower T1, the medium-pressure tower T2 and the low-pressure tower T3, and dynamic optimization control is achieved in combination with a feedforward neural network. In the process, a neural network prediction module (NNPM) acquires parameters such as feed flow, composition and product purity in real time, predicts and optimizes operation variables such as reflux ratio, pressure and thermal load of each tower, and combines proportional-integral-differential (PID) control to form an optimal control system, so that + / -20% of feed disturbance can be stably treated, and the quality of products is improved. The purity of the finally separated ethyl acetate, n-propyl alcohol and water reaches 99.9% or above, and effective energy saving is achieved.

The application relates to the technical field of drug crystallization, in particular to a preparation method of a crystal form II of buspirone hydrochloride. The technical scheme of the application is as follows: buspirone is put into water, the liquid-solid ratio is 1-3:1, and the temperature is controlled at 20-40 DEG C. Then, 1-1.5 equivalent of concentrated hydrochloric acid is added dropwise, and then stirring is continuously carried out for 2 hours, during which constant temperature needs to be controlled. Filtration is carried out, and the filtrate is collected. Subsequently, an alcohol solvent is added into the filtrate. Then, freezing is carried out at-20 DEG C to-50 DEG C. The frozen sample is vacuum freeze-dried in a freeze dryer, and the crystal form II of buspirone hydrochloride is obtained. The concentrated hydrochloric acid is characterized in that the dropwise adding time is 0.5-2 hours. The alcohol solvent is characterized in that the alcohol solvent is one of ethanol, isopropyl alcohol, n-propyl alcohol and n-butyl alcohol. The alcohol solvent in the fourth step is characterized in that the adding amount of the alcohol solvent is 0.05-0.2 times the feeding amount. The freeze-drying condition in the sixth step is characterized in that the cold trap temperature is-50 DEG C to-80 DEG C, and the pressure is 10 Pa to 40 Pa.

The present application relates to the field of liquor brewing, and particularly to a solid fermentation liquor brewing method for reducing the content of higher alcohols; the method constructs a mechanism for targeted inhibition of isobutanol, isoamyl alcohol and n-propyl alcohol and promotion of the generation of ethyl hexanoate; accurate quantification and comparison by gas chromatography-mass spectrometry show that the core of the method is to significantly reduce higher alcohols and improve key aroma substances; the method of the present application blocks the synthesis of higher alcohols without changing the proportion of traditional flavor substances of liquor, guarantees the liquor yield, reduces the nervous stimulation after drinking, and improves the metabolic clearance rate of ethanol in the body.

The invention belongs to the technical field of normal propyl alcohol waste gas recovery, and particularly relates to a normal propyl alcohol waste gas energy-saving and consumption-reducing recovery device which comprises a bio-trickling filter, a drainage pipe is installed on the inner wall of the bio-trickling filter through a sealing ring, a first electric control valve is arranged on the outer side of the drainage pipe, and a gas inlet pipe is fixedly connected to the left side of the drainage pipe; a second electric control valve is arranged on the outer side of the air inlet pipe, an air inlet box is fixedly connected to the outer side of the air inlet pipe in a sleeving mode, and a flow guide pipe is fixedly connected to the inner wall of the air inlet box. Through arrangement of structures such as a liquid inlet pipe, a rotating pipe and a spray head, treatment liquid can be sprayed to a filler disc, under the action of structures such as a servo motor and a first gear, the spray head can rotationally spray the treatment liquid, the spraying uniformity is improved, under the action of structures such as an annular groove and a sliding ball, components such as the rotating pipe can be rotationally limited, and the treatment effect is improved. The rotating stability of components such as the rotating pipe is improved.

The invention discloses a synthesis method of a baricitinib key process impurity, which comprises the following steps: by taking a compound I as a raw material and acetonitrile as a solvent, adding DBU to adjust alkali, and carrying out Michael addition with a compound II in an alkaline environment; the reaction liquid is concentrated to be dry, and oily matter is obtained; and heating the oily substance, dissolving the oily substance in n-propyl alcohol, cooling, crystallizing, filtering and drying to obtain a target product. Compared with an existing method, the method has the advantages that DBU is used for alkali adjustment, and the molar equivalent is optimized; the post-treatment method is changed, and the yield and the purity of the target product are remarkably improved through improvement.

The invention discloses a C2-C4 lower aliphatic amine catalyst as well as a preparation method and application thereof, and particularly relates to the technical field of catalysts. The catalyst comprises the following components in percentage by mass: 8-18% of NiO, 2-6% of MgO, 0.5-3% of ZnO and the balance of a composite carrier consisting of an MCM-41 molecular sieve and macroporous silicon dioxide, and the mass ratio of MCM-41 to silicon dioxide is 4: (0.1-2.0). The preparation method comprises the following steps: synthesizing MCM-41 powder through self-assembly of a template agent, mixing the MCM-41 powder with a pore-forming agent and a binder, molding to prepare a composite carrier, loading a nitrate solution of nickel, magnesium and zinc by adopting an equivalent-volume impregnation method, and drying and roasting to obtain the final catalyst. The catalyst shows extremely high catalytic activity and selectivity on ammonolysis reaction of ethanol, isopropanol, n-propanol and n-butanol under mild reaction conditions.

The invention discloses a medium-low temperature heat-power conversion green working medium as well as a preparation method and application thereof. The green working medium comprises the following components in percentage by mass: 25-90% of alcohol, 1-5% of alcohol amine, 1-5% of aromatic compound and the balance of water. The alcohol comprises at least three of methanol, ethanol, isopropanol, ethylene glycol, n-propyl alcohol and n-butyl alcohol. The working medium absorbs heat through coupling physical phase change and chemical reaction, the heat sink of the working medium can reach 6 MJ / kg or above, and the working medium can be used for aerodynamic heat absorption of a high-speed aircraft with the speed higher than 5 Mach, has the advantages of being low in cost and high in cooling capacity and is suitable for a thermal protection system of a high-heat-flux and long-time aerodynamic heating component; in addition, high-temperature and high-pressure small-molecule gas is generated for acting, and the maneuverability of the high-speed aircraft is effectively enhanced.

The invention relates to a vanadium-containing molecular sieve catalyst for preparing acetyl n-propanol through catalytic oxidation of 2-methyltetrahydrofuran and a preparation method, and belongs to the field of vanadium-containing molecular sieve catalysts for catalytic oxidation of 2-methyltetrahydrofuran. The preparation method specifically comprises the following steps: taking a silicon-aluminum-sodium microporous molecular sieve as a precursor, carrying out ion exchange by adopting an aqueous solution of a vanadium-containing compound, washing with water, drying, and roasting to prepare the vanadium-containing molecular sieve catalyst. The prepared catalyst is a catalyst for catalyzing molecular oxygen to oxidize 2-methyltetrahydrofuran to prepare acetyl n-propanol, and a new route for preparing acetyl n-propanol is realized.

The invention provides a preparation method of 1, 3-propylene glycol by integrating azeotropic distillation. According to the method, a specific reaction section and a specific separation section are combined, the reaction section is continuously operated through a high-efficiency catalyst, the production efficiency is high, and the reaction heat can be recycled; and the separation section integrates azeotropic distillation and heat coupling, so that the concentration limitation of the glycerol raw material is relieved, low-alcohol-water azeotropy is broken, the separation of alcohol-water azeotrope is realized, the entrainer can be regenerated and recycled, the operation energy consumption is low, and the industrial popularization is easy. Moreover, the preparation method provided by the invention can be used for obtaining high-index 1, 3-propylene glycol and separating products such as isopropanol, normal propyl alcohol and 1, 2-propylene glycol at the same time, and the purity of each separated product is 99.95% or above.

The invention discloses a preparation method and application of hempseed (-)-epicatechin-3-O-gallate, and belongs to the technical field of biology. According to the preparation method disclosed by the invention, the non-ester catechin and the ester-rich catechin are separated by adopting the mixed solvents of the ethanol, the methanol and the isopropanol, so that the extraction rate of the (-)-epicatechin-3-O-gallate can be improved (97% or above). Meanwhile, recrystallization is carried out by adopting organic solvents of methanol, normal propyl alcohol and isopropyl alcohol after extraction, so that the purity of the hempseed (-)-epicatechin-3-O-gallate can be improved (98% or above). The extracted epicatechin-3-O-gallate (ECG) is a natural antioxidant, has good biological activity, and has a good treatment effect on prevention and treatment of the hyperuricemia nephropathy.

To provide an X-ray contrast medium hardly causing allergic reaction in human.SOLUTION: Imaging agent 1 is an ester-linked compound of a carboxylated linear iodoalkane having 2 or 3 carbon atoms and a disaccharide. Examples of the carboxylated linear iodoalkane having a carbon number of 2 or 3 include aliphatic hydrocarbons such as ethylene triol and glycerin, or aliphatic hydrocarbons such as ethanol, ethylene diol, propanol (including 1-propyl alcohol and n-propyl alcohol), and the like. ) Propylene glycol or the like to which a hydroxy group is further added can be used. As the disaccharide, for example, sucrose or trehalose can be used.SELECTED DRAWING: Figure 1

The invention provides a synthesis method of 1-propyl phosphoric anhydride, which comprises the following steps: (a) adding an organic solvent, n-propyl alcohol and triethylamine into a reaction container, cooling to 0 DEG C or less, dropwise adding an organic solvent containing phosphorus trichloride, heating to 20-35 DEG C after dropwise adding, reacting, and filtering, concentrating and distilling to obtain a first intermediate; (b) carrying out reflux reaction on the first intermediate, 1-bromopropane and a catalyst to the end point; recovering unreacted 1-bromopropane under negative pressure, adding water for layering, and discarding a water phase to obtain a second intermediate; (c) co-heating the second intermediate and a hydrochloric acid solution to perform a reflux reaction; after the reaction is finished, carrying out negative pressure distillation, washing to remove residual hydrochloric acid, and concentrating to obtain a third intermediate; and (d) reacting the third intermediate with acetic anhydride in an inert atmosphere, carrying out negative pressure distillation to remove by-product acid, and ending the distillation when no distillate exists. 1-propyl phosphoric anhydride with high yield and high purity is obtained, and the reaction process is economical and environment-friendly.

The invention belongs to the technical field of extraction and separation, and particularly relates to an extraction method and a detection method of volatile substances in honey. The extraction method comprises the following steps: mixing honey and a buffer solution to obtain a honey pretreatment solution; the honey pretreatment liquid is subjected to ultrasonic extraction by sequentially adopting a polar gradient deep eutectic solvent aqueous two-phase system (such as a deep eutectic solvent which is sequentially mixed with tert-butyl alcohol, isobutanol, n-butyl alcohol, n-propyl alcohol and isopropyl alcohol), and an obtained alcohol upper phase contains volatile substances. According to the method, the characteristics of active ingredients in the honey are combined, a polar gradient deep-eutectic solvent aqueous two-phase extraction system is constructed by utilizing the solvent polarity and similar dissolvability principle, simultaneous separation and enrichment of multiple types of active ingredients are realized, and the method is an efficient and green honey sample pretreatment method. According to the invention, a multi-stage gradient extraction technology is adopted, so that excellent extraction effect and sensitivity are shown; the invention provides a new solution for green extraction of natural products.

The present invention relates to an anisotropically conductive heat activated adhesive composition, comprising a) one or more thermoplastic resin; b) metal coated particles; and c) a solvent selected from the group consisting of l-methoxy-2- propanylacetate,2-butoxyethyl acetate, 2-(2-butoxyethoxy)ethanol, [2-(2-butoxyethoxy)-ethyl]acetate, 2-butoxyethanol, isophorone, 3, 3, 5-trimethyl-2-cyclohexene-l-one, dimethyl succinate, dimethyl glutarate, dimethyl adipate, acetic acid, l-methoxypropan-2-ol, 1- methoxy-2-propylacetat, dipropylene glycol (mono)methylether, toluene, ethanol, isopropyl alcohol, n-propanol, ethoxy propanol, ethylacetate, butyl acetate, n-propyl acetate, isopropyl acetate, methyl ethyl ketone, methyl isobutyl ketone, glycol ethers and mixtures thereof, wherein the one or more thermoplastic resin is dissolved into the solvent. The composition can be used in electronic devices.

The utility model discloses energy-saving n-propyl acetate production equipment which comprises a main body, a stirring cavity is formed in the main body, a heating cavity is formed in the outer side of the stirring cavity, an electric heating plate is arranged in the heating cavity, and the energy-saving n-propyl acetate production equipment further comprises a first transmission cavity which is formed in the upper end of the interior of the main body; first rotating rods are rotationally arranged on the two sides of the upper end in the first transmission cavity, second transmission cavities are formed in the two sides of the lower end in the main body, one ends of the first rotating rods penetrate through the stirring cavity and extend into the second transmission cavities, and the first rotating rods are rotationally connected with the second transmission cavities. When the energy-saving n-propyl acetate production equipment is used for stirring and mixing, liquid can be circulated and exchanged in a wider area, the layering phenomenon in the liquid can be broken through multidirectional flow, and acetic acid and n-propyl alcohol molecules are ensured to be fully contacted and mixed in a shorter time, so that the mixing uniformity is improved.

The invention belongs to the technical field of pesticides, and particularly relates to a synthesis method of a propamocarb hydrochloride aqueous solution, which comprises the following two steps: S1, adding excessive N, N-dimethyl propane diamine into a low-temperature acylation kettle, and carrying out acylation reaction on the excessive N, N-dimethyl propane diamine and phosgene to generate 3-(dimethylamino) propyl carbamoyl chloride hydrochloride; and S2, carrying out esterification reaction on the 3-(dimethylamino) propyl carbamoyl chloride hydrochloride and excessive normal propyl alcohol to generate propamocarb hydrochloride. According to the invention, the escape of phosgene is solved, and the absorption kettle is innovatively introduced on the basis to absorb trace phosgene which may escape, so that zero emission of phosgene is realized, the potential safety hazard of phosgene residue is thoroughly eliminated, the production safety is greatly improved, and meanwhile, the environmental pollution possibly caused by phosgene leakage is also solved; and the personal safety of production personnel and the sustainability of the environment are guaranteed.

The invention relates to a device and a method for recovering n-propyl acetate through azeotropic distillation. According to the method, the waste liquid obtained through activated carbon adsorption and desorption in the printing industry is subjected to azeotropic distillation to remove light components by adding an entrainer, and the high-purity n-propyl acetate solvent is recovered through distillation recovery. Waste liquid and cyclohexane enter a first rectification device in a continuous feeding mode to be subjected to azeotropic rectification, an azeotropic phenomenon exists between cyclohexane and ethyl alcohol, n-propyl alcohol, isopropyl alcohol and ethyl acetate, and azeotropic light components containing ethyl alcohol, n-propyl alcohol, isopropyl alcohol and ethyl acetate are extracted from the top of the first rectification device; and condensing the azeotropic component by a first condenser, partially refluxing and extracting to obtain a heavy component mainly containing n-propyl acetate, rectifying in second rectification equipment, extracting an n-propyl acetate solvent from the tower top, condensing by a second condenser, partially refluxing and extracting to obtain the n-propyl acetate. Heavy components containing propylene glycol monomethyl ether and n-butyl acetate are obtained in the second reboiler, and a solution in the second reboiler can be subjected to secondary rectification.

A composition includes particular amounts of methyl formate and a second solvent selected from acetone, acetonitrile, cyclopentanone, dimethyl carbonate, dimethyl formamide, dimethyl sulfoxide, 1,3-dioxolane, ethylene glycol monomethyl ether, gamma butyrolactone, isopropyl alcohol, methyl acetate, methylal, methyl glyoxal, propionaldehyde, propionic acid, n-propyl alcohol, propylene carbonate, 2-pyrrolidone, tetrahydrofuran, thioacetic acid, thiophene, transdichloroethylene, water, or a combination thereof. The composition can be particularly useful in removing a coating from a surface.