51 results about "Propyl acetate" patented technology

The application relates to the technical field of ink solvents, and particularly discloses an environmentally-friendly water-based ink solvent with high drying efficiency and a preparation method thereof, the environmentally-friendly water-based ink solvent with high drying efficiency comprises the following raw materials in parts by weight: 40-60 parts of water, 30-50 parts of a bio-based alcohol compound, 5-15 parts of n-propyl acetate, 0.3-1 part of tripropylene glycol n-butyl ether, 1-3 parts of nano-cellulose, 0.5-1 part of calcium chloride, 1-2 parts of a pH regulator and 0.2-0.4 parts of a chelating agent. The environmentally-friendly water-based ink solvent with high drying efficiency and the preparation method thereof can be used for ink printing, and have the advantages of high drying efficiency and good stability.

The invention relates to the technical field of ink solvents, and particularly discloses an environment-friendly water-based ink solvent with high drying efficiency and a preparation method of the environment-friendly water-based ink solvent. The environment-friendly water-based ink solvent with high drying efficiency is prepared from the following raw materials in parts by weight: 40 to 60 parts of water, 30 to 50 parts of bio-based alcohol compound, 5 to 15 parts of n-propyl acetate, 0.3 to 1 part of tripropylene glycol n-butyl ether, 1 to 3 parts of nano cellulose, 0.5 to 1 part of calcium chloride, 1 to 2 parts of pH regulator and 0.2 to 0.4 part of chelating agent. The environment-friendly water-based ink solvent with high drying efficiency and the preparation method thereof can be used for ink printing, and have the advantages of high drying efficiency and good stability.

The invention discloses a benzene-free environment-friendly plastic printing ink diluent and a preparation method thereof, and relates to the field of chemical engineering. The environment-friendly flame retardant is prepared from the following components in parts by weight: 10 to 25 parts of ethyl acetate, 8 to 15 parts of refined methyl acetate, 5 to 10 parts of butyl acetate, 10 to 30 parts of dimethyl carbonate, 6 to 15 parts of methylal, 10 to 20 parts of propyl acetate, 2 to 7 parts of dibasic acid ester, 3 to 10 parts of propylene glycol monomethyl ether, 7 to 15 parts of isopropanol and 3 to 9 parts of propylene carbonate. According to the present invention, the ethyl acetate, the dimethyl carbonate and other benzene-free solvents are adopted to replace the traditional benzene-series solvent, such that the benzene-free environmental protection target is achieved, the environmental residue and the human health risk are substantially reduced, in addition, the propylene carbonate, the dibasic acid ester and the like in the formula further have the biodegradability, the environmental protection performance of the diluent is further improved, and the environmental protection performance of the diluent is further improved. The cost of the prepared benzene-free environment-friendly plastic printing ink diluent is remarkably reduced compared with that of an imported diluent.

The invention discloses environment-friendly alcohol-soluble gravure inner printing ink for an OPS shrink film and a preparation method of the ink. The ink is prepared from, by mass, 32.5%-35% of modified alcohol-soluble polyurethane resin liquid, 2%-3.5% of cellulose acetate butyrate liquid, 6%-6.5% of aldehyde ketone resin liquid, 55%-62.8% of color paste, 3.4%-4% of auxiliaries, 9%-30% of pigment and the balance mixed solvent. The mixed solvent is a combination of n-propyl ester, isopropanol and ethanol, and the color paste comprises fumed silica. According to the ink disclosed by the invention, the modified alcohol-soluble polyurethane resin is matched with the aldehyde ketone resin, a hydroxyl (-OH) group in the aldehyde ketone resin is utilized to generate an infiltration effect on the surface of an OPS shrink film, and an ester solvent is matched to permeate into the surface of the OPS shrink film to form occlusion, so that the adhesive force of a coating is improved; meanwhile, the cellulose acetate butyrate resin liquid with high hardness and adhesion resistance is used and matched with fumed silica with good adhesion resistance, so that the ink is quick to dry and good in film-forming property and has good adhesion resistance.

The application provides a flavor composition for electronic cigarettes, electronic cigarette liquid and a preparation method thereof. The flavor composition for electronic cigarettes comprises 0.1-0.4 parts of ethyl isovalerate, 2.0-5.0 parts of isoamyl acetate, 0.1-0.6 parts of ethyl butyrate, 0.4-1.6 parts of ethyl acetate, 0.1-0.6 parts of propyl acetate, 0.1-0.6 parts of myric aldehyde, 0.05-0.3 parts of malic acid liquid and 0.02-0.1 parts of acetic acid liquid. By adjusting the ratio of the flavor composition, the application makes the flavor composition have strawberry flavor, can restore the pure fruit pulp aroma of strawberries, has high restoration degree of strawberry flavor, long aftertaste and good stability after high-temperature and high-humidity baking, and can be applied to electronic cigarette liquid, thereby improving the experience of users using electronic cigarettes.

This application discloses a method for producing acetonitrile by amination of acetate, comprising the following steps: in a reactor, acetate, ammonia, and a catalyst are contacted and reacted to obtain acetonitrile; wherein the acetate is selected from at least one of methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and cyclohexyl acetate; the catalyst is composed of a support and alkaline earth metal oxides and alkali metal oxides supported on the surface of the support; wherein the support is selected from at least one of silicon oxide, aluminum oxide, titanium oxide, and zirconium oxide; wherein the alkaline earth metal oxide is selected from at least one of magnesium oxide, calcium oxide, strontium oxide, and barium oxide; wherein the alkali metal oxide is selected from at least one of lithium oxide, sodium oxide, and potassium oxide; wherein the loading of alkaline earth metal oxide in the catalyst is 0.01–10 wt%, the loading of alkali metal oxide is 0.05–5 wt%, and the remainder is the support.

Provided is a slide fastener tape capable of imparting water repellency to a slide fastener using an organic solvent containing no toluene or MEK as a binder, and a slide fastener using such a slide fastener tape. The present invention relates to a slide fastener tape (10) comprising: a base fabric (11) having a first surface (10a) and a second surface (11b); and a water repellent film (12) attached to at least one of the first surface (10a) and the second surface (11b) of the base fabric (11). The water repellent film (12) has a layered structure comprising a skin layer (14) composed of a polyurethane film and a bonding layer (13) disposed between the skin layer (14) and the base fabric (11) and composed of a cured product of a polyurethane-based adhesive. The polyurethane-based adhesive is obtained by dissolving a polyurethane resin in a solvent containing dimethyl carbonate and propyl acetate. A slide fastener (1) of the present invention comprises the slide fastener tape (10).

To provide an optical layered body capable of suppressing a decrease in adhesiveness and scratch resistance over time.SOLUTION: There is provided an optical layered body having at least one functional layer on a substrate, in which a concentration of propyl acetate is 0.02 mg / m2 or more and 15.00 mg / m2 or less; a concentration of alkyl acetate other than propyl acetate is 0.35 mg / m2 or less; and a concentration of alkyl lactate is 0.45 mg / m2 or less regarding the concentration of propyl acetate in the optical layered body, the concentration of alkyl acetate other than propyl acetate and the concentration of alkyl lactate according to quantitative analysis by gas chromatography.SELECTED DRAWING: Figure 1

The invention discloses a polyurethane ink binder suitable for solvent-free compounding as well as a preparation method and application thereof, and belongs to the technical field of polyurethane ink. The problems that in the prior art, intaglio printing polyurethane ink is uneven in solvent-free composite coating, low in composite strength, fuzzy in pattern and the like when applied to solvent-free composite coating are solved. The preparation raw materials of the polyurethane ink binder comprise preparation raw materials of alcohol ester soluble polyurethane resin, ethyl acetate, n-propyl acetate and isopropanol. The alcohol ester soluble polyurethane resin is prepared from the following raw materials: polyol with branching degree of 40-60%, diisocyanate, a branching chain extender, a catalyst, an amine chain extender, an end-capping reagent and a silane coupling agent. The polyurethane ink binder can be applied to solvent-free compounding polyurethane ink, especially flexible package intaglio printing solvent-free compounding polyurethane ink, the stability of the polyurethane ink is guaranteed, the environmental protection property is excellent, the compounding strength is high, the solvent-free colloid solubility resistance is good, the leveling property is good, and the comprehensive performance of the product is excellent.

A secondary battery is provided and includes an exterior member having flexibility, and a positive electrode, a negative electrode, and an electrolytic solution that are housed in the exterior member. The electrolytic solution contains a solvent and an electrolyte salt, and the solvent contains propyl acetate and propyl propionate. The ratio of the content of propyl acetate in the solvent to the sum of the content of propyl acetate in the solvent and the content of propyl propionate in the solvent is 0.1 or more and 0.5 or less.

The embodiment of the invention relates to the technical field of batteries, and provides a battery which comprises a positive plate, a negative plate and an electrolyte, and the electrolyte comprises propyl acetate and a compound as shown in a formula 1; the positive plate comprises a positive current collector and a positive active coating coated on at least one surface of the positive current collector, the positive active coating comprises a positive active material, and the positive active material comprises an Ni element; the mass percentage content a of the propyl acetate in the electrolyte, the mass percentage content b of the compound shown in the formula 1 in the electrolyte and the molar percentage content c of the Ni element in all transition metal elements in the positive electrode active material meet the condition that (a + b) / c is greater than or equal to 0.15 and less than or equal to 1. Through mutual cooperation and interaction of the three components, the temperature rise of the battery can be effectively reduced, and the safety of the battery is improved.

The invention belongs to the technical field of pharmaceutical preparations, and discloses a butterflybush flower solution preparation for atomizing and fumigating eyes as well as a preparation method and application of the butterflybush flower solution preparation. According to the invention, aqueous ethyl acetate, propyl acetate or butyl acetate is used as an extraction solvent to extract effective components in butterflybush flower, and the butterflybush flower solution preparation for atomizing and fumigating eyes is prepared by scientifically combining an extract taking butterflybush flower as a core marking component with an osmotic pressure regulator and a solvent. The preparation has excellent physical performance parameters, is easy to atomize to form aerosol, is simple and easy to operate, and has a good treatment effect on eye diseases such as asthenopia, xerophthalmia, diabetic retinopathy and conjunctivitis.

A secondary battery includes: a positive electrode containing a lithium-nickel composite oxide; a negative electrode containing a lithium-titanium composite oxide; and an electrolyte containing a carboxylic acid ester containing at least one of ethyl acetate, propyl acetate, ethyl propionate, and propyl propionate. In surface analysis of the positive electrode using X-ray photoelectron spectroscopy, a first oxygen spectrum having a peak in a range of a binding energy of 528 eV or more and 531 eV or less, and a second oxygen spectrum having a peak in a range of a binding energy of more than 531 eV and 535 eV or less are detected, and a ratio of an intensity of the first oxygen spectrum to an intensity of the second oxygen spectrum is 0.30 or more and 0.80 or less. In surface analysis of the negative electrode using X-ray photoelectron spectroscopy, a third oxygen spectrum having a peak in a range of a binding energy of 528 eV or more and 531 eV or less, and a fourth oxygen spectrum having a peak in a range of a binding energy of more than 531 eV and 535 eV or less are detected, and a ratio of an intensity of the third oxygen spectrum to an intensity of the fourth oxygen spectrum is 0.82 or more and 1.35 or less.

Provided is an optical layered body capable of suppressing a reduction over time in adhesiveness and scratch resistance. This optical layered body has at least one functional layer on a substrate. The concentration of propyl acetate in the optical layered body is 0.02 mg / m2 to 15.00 mg / m2 as determined by gas chromatography quantitative analysis.

The present invention relates to the technical field of electrochemical aluminum coatings, and specifically proposes a laser-positioning electrochemical aluminum coating composition and a preparation method thereof. The composition comprises the following components in parts by weight: 35-50 parts of a dicyclopentadiene-maleimide block copolymer, 3-5 parts of sulfonated nano-silica, 1-2 parts of an epoxy silane coupling agent, 2-4 parts of a fluorinated acrylate polymer, 40-60 parts of a butanone / n-propyl acetate mixed solvent, and 0.5-1 parts of a photoinitiator. The laser-positioning electrochemical aluminum coating composition and the preparation method thereof provided by the present invention significantly improve the adhesion and heat resistance of the aluminum coating layer through the synergistic effect of the rigid cyclic structure of the dicyclopentadiene-maleimide block copolymer and the coordination bond of the maleimide group, combined with the ionic bond anchoring effect of the sulfonated nano-silica.

The invention belongs to the technical field of fermentation engineering, and particularly relates to Wickerhamomyces anomalus JG-WA1 and application thereof in aroma-enhancing fruit wine. A strain of aroma-enhanced Wickerhamomyces anomalus JG-WA1 is screened from distiller's yeast, apple juice is inoculated with the strain for primary fermentation, then saccharomyces cerevisiae is inoculated for secondary fermentation, and the aroma-enhanced fruit wine is prepared. The content of unpleasant odor substances such as acetone, 4-methyl-1-pentanol, 2-butanol, dimethyl disulfide, 3-hexanone and the like with pungent smell of alcohol or mildew odor and the like in the fruit wine is obviously reduced, while the content of 2-pentanol, ethyl propionate, propyl acetate, 3-methyl-2-pentanone, 3-pentene-2-ketone, hexyl hexanoate, ethyl hexanoate, methyl acetate, heptanal, 2-octanone, 2, 3-pentanone, ethyl hexanoate, ethyl hexanoate, methyl acetate, heptanal, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate and ethyl hexanoate is obviously reduced. The content of fruit flavor components such as 2, 3-dimethylpyrazine is greatly increased, the brewed apple wine is obvious in ester flavor and transparent and bright in color, and the flavor quality is obviously improved.

This application discloses a method for producing acetonitrile, comprising the following steps: in a reactor, contacting an acetate, ammonia, and a catalyst to react and obtain acetonitrile; wherein the acetate is selected from at least one of methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and cyclohexyl acetate; wherein the catalyst is composed of a support and a divalent transition metal oxide, an alkaline earth metal oxide, and an alkali metal oxide supported on the surface of the support; wherein the divalent transition metal oxide is selected from at least one of manganese oxide, ferrous oxide, cobalt oxide, nickel oxide, copper oxide, and zinc oxide; wherein the alkaline earth metal oxide is selected from at least one of magnesium oxide, calcium oxide, strontium oxide, and barium oxide; and wherein the alkali metal oxide is selected from at least one of lithium oxide, sodium oxide, and potassium oxide.

The invention discloses a marking substance for wheat mildewing in wine brewing unprocessed grains and a rapid detection method, which are used for rapidly detecting wheat mildewing on the basis of six scientifically screened marking substances including cyclopentanone monomer, ethyl 3-hydroxybutyrate, propyl acetate, tert-butyl alcohol, 2-butanone and nonanal, and providing an accurate basis for judging a wheat mildewing stage. Wine brewing raw grain wheat mildew stage division is realized, and wheat mildew detection accuracy is improved. Based on the early-stage mildew marker substance, early-stage detection of wheat mildew is realized, and the detection sensitivity is enhanced; based on the signal intensity and combination characteristics of the marker substance, determining the main mould types of wheat mildew; besides, the rapid detection of the mildew of the wine-making raw grain wheat is verified by multiple methods, and the similarity calculation, dynamic principal component analysis, clustering heat map analysis and voting method or weighted scoring model of mildew samples at different mildew stages are combined, so that the cross validation of the multiple methods is realized; and the accuracy and reliability of determining the mildew stage and the mold type are improved.

This application discloses a method for producing acetonitrile by reacting acetate with ammonia, comprising the following steps: in a reactor, acetate, ammonia, and a catalyst are contacted and reacted to obtain acetonitrile; the acetate is selected from at least one of methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and cyclohexyl acetate; the catalyst is composed of a support and vanadate and alkali metal oxide of active components supported on the surface of the support; the vanadate is selected from at least one of bismuth vanadate, silver metavanadate, ammonium metavanadate, lithium vanadate, lithium metavanadate, sodium vanadate, sodium metavanadate, potassium vanadate, and potassium metavanadate; the alkali metal oxide is selected from at least one of lithium oxide, sodium oxide, and potassium oxide; the support is selected from at least one of silicon oxide, alumina, and molecular sieve; the mass content of vanadate is 0.1–10 wt%, and the mass content of alkali metal oxide is 0.01–5 wt%.

The application provides a wide-temperature lithium ion battery electrolyte and a lithium ion battery thereof, wherein the lithium ion battery electrolyte comprises a lithium salt, a nonaqueous organic solvent and an additive; the nonaqueous organic solvent comprises a first carbonate, a second carbonate, a third carbonate, a fourth carbonate and a carboxylic acid ester; the first carbonate is dimethyl carbonate and the volume percentage is 39-51%; the second carbonate is propylene carbonate and the volume percentage is 10-15%; the third carbonate is ethylene carbonate and the volume percentage is 8-15%; the fourth carbonate is methyl ethyl carbonate and / or diethyl carbonate and the volume percentage is 8-10%; and the carboxylic acid ester is one or more of propyl acetate, propyl propionate and ethyl propionate and the volume percentage is 19-26%. On the basis of the synergistic effect of dimethyl carbonate and propylene carbonate, the addition of ethylene carbonate, the fourth carbonate and the linear carboxylic acid ester can make the lithium ion battery have better high and low temperature performance.

The utility model discloses an esterification device in a propyl acetate synthesis process, which belongs to the technical field of esterification devices and comprises a reaction tank, a feed pipe and an exhaust pipe are respectively arranged at the edge of the top end of the reaction tank, a plurality of annular electric heating rods are embedded in the inner wall layer of the reaction tank, and a double-shaft motor is fixedly connected to the center of the top end of the reaction tank. An output shaft at the bottom end of the double-shaft motor extends into the reaction tank; when the esterification device is used, raw materials including propyl alcohol and acetic acid can be added into the reaction tank through the feeding pipe, required catalysts are loaded in the catalyst hopper, then, the spline shaft drives the spline housing to synchronously drive the stirring rods to rotate by starting the double-shaft motor and the electric heating rods, and in addition, the stirring rods are driven by the spline shaft to rotate. The transmission roller rotates, and the lifting ring drives the lifting rod and a connecting plate fixed to the bottom end of the lifting plate to do reciprocating lifting motion and drives the spline housing in the rotating process to do reciprocating lifting motion in combination with the effects of an inclined ring groove and a guide ball.

The invention provides a hydrogen peroxide-ester solution for lignin removal and a method for removing lignin from a lignocellulose raw material, and belongs to the field of biodegradation and conversion of forestry biomass. The invention provides a hydrogen peroxide-ester solution for lignin removal. The hydrogen peroxide-ester solution comprises a hydrogen peroxide solution and a mixture containing an acid catalyst and liquid ester, the liquid ester is one or more of propyl acetate, butyl acetate, diethyl oxalate and glyceryl triacetate; the acid catalyst comprises one or more of aluminum chloride, sulfuric acid and p-toluenesulfonic acid. The boiling point of the ester is above 100 DEG C, the ester is not easy to volatilize in the removal process of the lignin, and the ester can be decomposed and peracetic acid can be synthesized at the same time by adjusting the type of the catalyst, so that the efficient removal of the lignin is improved. The result of the embodiment shows that 85% or above of the lignin component of the untreated raw material can be removed when the removal time is 1 h.

The invention provides a method for improving the reaction conversion rate of propyl acetate. The method for improving the reaction conversion rate of propyl acetate comprises the following steps: L1, adding propyl alcohol and acetic acid into an esterification tower, and carrying out esterification reaction under the catalysis of a blend of a solid acid catalyst and a filler to obtain crude propyl acetate at the top of the esterification tower; wherein the middle part of the esterification tower is provided with a filler area, and the filler area is filled with a blend of a solid acid catalyst and an inorganic filler; the filler area of the esterification tower is filled with a blend compounded by a solid acid catalyst and an inorganic filler. The preparation method comprises the following steps: firstly, carrying out surface modification on silicon dioxide through KH-560, and introducing an epoxy group; then reacting with polyethyleneimine to form amino-functionalized silicon dioxide; then reacting with amino POSS (Polyhedral Oligomeric Silsesquioxane) and epoxy polystyrene to obtain an intermediate product with a three-dimensional network structure; and finally, sulfonating through chlorosulfonic acid, and introducing a strongly acidic sulfonic acid site.

The utility model relates to the technical field of chemical production and preparation, and discloses an energy-saving and environment-friendly esterification bed for synthesizing n-propyl acetate, which comprises an esterification reaction bed, a spiral steam heating pipe and a reflux spiral pipe are arranged in the esterification reaction bed, and a steam leading-in pipe and a steam leading-out pipe are respectively arranged on two sides of the esterification reaction bed. According to the utility model, the spiral steam heating pipe and the reflux spiral pipe are arranged in the esterification reaction bed, the steam leading-in pipe can lead external high-heat steam into the spiral steam heating pipe, the spiral steam heating pipe is used for high-temperature heating, the steam flows back from the steam leading-out pipe and is led into the reflux spiral pipe, the waste heat is heated, and the waste heat is refluxed and utilized; the driving motor is operated to drive the driving stirring piece to mix and stir, so that the mixing reaction effect of the reaction bed is improved, and the device has waste heat backflow utilization capability, high heat energy utilization efficiency, reduced use cost and good energy-saving and environment-friendly effects.

The present invention relates to a process for the preparation of a compound of formula (II), a stereoisomer, salt, hydrate or solvate thereof, comprising the step of sulfinylating a compound of formula (IV) to produce a compound of formula (II); wherein: R1 and R2 are as defined in the claims; wherein the sulfinylation step is carried out in the presence of a solvent selected from the group consisting of benzene, toluene, ethylbenzene, xylene, chlorobenzene, bromobenzene, fluorobenzene, anisole, nitrobenzene, tetrahydronaphthalene, dichlorobenzene, trimethylbenzene, ethyl acetate, propyl acetate, butyl acetate, propanol, butanol, 2-methyltetrahydrofuran, diethyl ether, methyl tert-butyl ether, cyclopentylmethyl ether, dichloromethane, and tetrachloromethane, pentane, hexane, heptane, cyclohexane, decahydronaphthalene and mixtures thereof.

The invention provides a method for utilizing heat of a propyl acetate recovery tower. The method for utilizing the heat of the propyl acetate recovery tower comprises the following steps: L1, feeding propyl acetate crude ester produced by an esterification tower into a rectifying tower, and purifying to obtain a recovery product and propyl acetate; and L2, the recovery product enters a recovery tower from the top of the recovery tower for recovery treatment, and a gas-phase product at the top of the recovery tower is connected with an esterification tower reboiler through a pipeline and is used for heating the esterification tower reboiler. A high-temperature gas-phase product generated at the top of a recovery tower is used as a heat source of a reboiler of an esterification tower, a heat-conducting coating is arranged on the inner wall of the reboiler of the esterification tower, and graphene and graphene modified by 3-(perfluoro-n-hexyl) epoxypropane, amino POSS and KH560 are introduced as components of the heat-conducting coating. The coating not only has good corrosion resistance, but also greatly improves the heat conduction efficiency of the esterification tower reboiler.

The invention relates to the technical field of esterification reaction catalysis, in particular to a synthesis method of n-propyl acetate, which comprises the following steps: S1, feeding raw materials in an esterification stage into a reactor; s2, stirring and heating, adding an ionic liquid catalyst, and continuously heating; s3, continuously collecting the liquid when the reaction begins to reflow; s4, when the reaction liquid is close to a theoretical value, starting sampling, judging according to the reaction liquid and the kettle liquid gas phase, and when the content of n-propyl ester in the reaction liquid gas phase is greater than 80%, regarding as a reaction endpoint; s5, rectifying and purifying the obtained crude ester phase until the product content is 99.8%; and S6, continuously replenishing the raw materials into the kettle liquid phase to realize continuous reaction production of the n-propyl acetate. By integrating an ionic liquid catalytic esterification technology and an esterification condition control technology, the purposes of environmental friendliness, high catalytic efficiency, high repeated utilization rate, simple separation and high yield are achieved, and continuous production of n-propyl acetate is realized.

The invention relates to a catalyst, system and method for preparing n-propyl acetate and n-propyl alcohol from propylene and acetic acid, and the method comprises the following steps: propylene, acetic acid and oxygen are subjected to an oxygen acetylation reaction under the action of a palladium-antimony bimetallic supported catalyst to generate allyl acetate; after separation and purification, allyl acetate enters a hydrogenation reactor, n-propyl acetate is generated through hydrogenation under the action of a Pd catalyst, after hydrogen is separated through a gas-liquid separator, n-propyl acetate enters a reactive distillation tower, n-propyl acetate and methyl alcohol are subjected to transesterification under the action of alkaline ion exchange resin, and n-propyl alcohol and methyl acetate are generated. And separating and purifying to obtain methyl acetate and normal propyl alcohol. Compared with the prior art, the method is good in atom economy, low in raw material cost, high in catalyst activity, good in stability, high in production continuity degree, simple in subsequent separation and purification, high in product purity and suitable for large-scale production.

The present invention belongs to the field of organic synthesis, and particularly relates to a production process of 2-(4-chlorophenoxy)propylhydroxylamine, which comprises the following steps: S1. Synthesis of methyl 2-(4-chlorophenoxy)propionate: Add DMF, 4-chlorophenol, and potassium carbonate to a substitution reaction kettle, heat to 50-70 °C, and keep the temperature for reaction for 1-2 h. After the heat preservation is completed, add methyl 2-chloropropionate and potassium iodide to the substitution reaction kettle, heat to 60-80 °C, and keep the temperature for reaction for 1-3 h. After the reaction is completed, perform post-treatment to obtain methyl 2-(4-chlorophenoxy)propionate; S2. Synthesis of 2-(4-chlorophenoxy)propanol; S3. Synthesis of 2-(4-chlorophenoxy)propyl p-toluenesulfonate; S4. Synthesis of 2-(4-chlorophenoxy)propyl acetate oxime; S5. Synthesis of 2-(4-chlorophenoxy)propylhydroxylamine. The beneficial effects of the present invention are as follows: The present invention adopts a new synthetic route to prepare 2-(4-chlorophenoxy)propylhydroxylamine. The reaction conditions are mild, the highest reaction temperature does not exceed 80 °C, the reaction yield is relatively high, and the overall yield is also relatively high, which is suitable for large-scale production.

The invention provides a method for improving the quality of a propyl acetate rectification finished product. The method for improving the quality of the rectified finished product of propyl acetate comprises the following steps: L1, adding propyl alcohol and acetic acid into an esterification tower, and carrying out esterification reaction under the catalysis of a blend of a solid acid catalyst and an inorganic filler to obtain crude propyl acetate at the top of the esterification tower; l2, crude propyl acetate is output from a discharging port of the esterification tower and then enters a rectifying tower to be purified; wherein the middle part of the esterification tower is provided with an inorganic filler area, and the inorganic filler area is filled with a blend of a solid acid catalyst and an inorganic filler; the catalyst containing a large number of sulfonic acid groups is prepared by adding KH-560 modified silicon dioxide, sequentially reacting with polyethyleneimine and oxidized bamboo fibers and then treating with chlorosulfonic acid.