15results about How to "Promote esterification reaction" patented technology

The invention belongs to the technical field of hydrophobic materials, and particularly relates to transparent hydrophobic paper and a preparation method and application thereof.The preparation method comprises the steps that a reaction reagent n-decanoic acid is mixed with a catalyst, a condensing agent and an organic solvent to obtain a reaction solution, the catalyst is 4-dimethylaminopyridine, and the condensing agent is 4-dimethylaminopyridine; the condensing agent is 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, and the solvent is a solvent; the transparent paper-based material is placed in a reaction solution to be subjected to esterification reaction, and the transparency of the transparent paper-based material is hardly influenced; the esterification reaction introduces a hydrophobic alkyl chain on the surface of the paper-based material, so that the hydrophobicity of the paper-based material is improved, the transparency of the paper-based material can be retained, and the film-forming property of PEDOT: PSS on a paper base is not influenced.

The invention relates to the technical field of polystyrene, and discloses an antibacterial graphene modified polystyrene plastic, a bromine atom of bromobutane triphenylphosphonium bromide and a hydroxyl group of polyol are subjected to a nucleophilic substitution reaction to obtain a hydroxyl-terminated triphenylphosphonium bromide, and the hydroxyl-terminated triphenylphosphonium bromide is used as a quaternary phosphonium salt antibacterial monomer to prepare the antibacterial graphene modified polystyrene plastic. A plurality of hydroxyl groups contained at the chain end can increase reaction sites and accelerate esterification reaction with acyl chloride groups of graphene, so that quaternary phosphonium salt antibacterial monomers are chemically bonded to the surface of graphene to obtain functionalized graphene with high antibacterial activity, and triphenylphosphonium bromide modified on the surface of graphene contains a large number of benzene ring structures, so that the antibacterial activity of the graphene is improved. Compared with the prior art, the graphene has the advantages that the polarity of the graphene is similar to that of styrene, the interface affinity and compatibility of graphene and polystyrene can be improved, dispersion of graphene is promoted, agglomeration is reduced, and polystyrene is endowed with excellent antibacterial performance and tensile strength.

The application provides a method for dynamically regulating alcohol content to enhance the flavor of solid vinegar, comprising the following steps: S1, liquefaction; S2, saccharification; S3, alcohol fermentation; S4, solid-state layered fermentation; and S5, finished product preparation. The vinegar preparation method has the advantages that the fermentation performance is improved, the fermentation period is shortened, the conversion rate of acetic acid is improved, the biomass of bacteria is increased, the growth of acetic acid bacteria is as good as possible, the rate of acetic acid fermentation is improved, the period of acetic acid fermentation is shortened, the flavor of liquid-state fermented vinegar is improved, the irritation of solid-state fermented vinegar is reduced, and the method has a good market application prospect.

This invention relates to a production process for bamboo-cotton blended fabric, belonging to the field of fiber weaving technology. The process includes the following steps: bamboo fiber yarn is treated with cellulase and then impregnated in a carboxylated chitosan solution. After stirring, the yarn is removed, and excess solution is removed to obtain modified bamboo fiber yarn. Cotton fiber yarn is reinforced with a cotton fiber reinforcing agent to obtain modified cotton fiber yarn. The modified bamboo fiber yarn and cotton fiber yarn are spun together to prepare a base fabric. The base fabric is then treated with a processing solution to obtain a bamboo-cotton blended fabric. This invention provides an improved process for preparing bamboo-cotton blended fabric, which can improve the fabric's wash fastness, comprehensively enhance its antibacterial effect, and improve its mechanical properties, thereby meeting the market demand for high-quality textiles.

The invention discloses a production and preparation system of methylparaben, including an esterification kettle, a condenser and a methanol recovery tank, wherein a jacket is installed outside the esterification kettle, a vertical rotating shaft is rotatably installed at the top of the esterification kettle, the bottom end of the vertical rotating shaft extends to the inside of the esterification kettle and a buffer container is fixed outside, an agitator is fixed at the bottom end of the vertical rotating shaft, and the vertical rotating shaft is hollow inside and communicated with the buffer container. In the present invention, the liquid distributor includes a distribution pipe and a liquid spray pipe, and a horizontal movable rod with a reset spring and a sealing plug are provided in the distribution pipe, so that intermittent spraying of methanol can be realized; the pressurizing piston and the elastic telescopic rod in the buffer container can pressurize methanol. The vertical drive box, the cleaning scraper and the scraper blade combination in the esterification kettle can clean the kettle wall, which can improve the mixing effect, prevent material residue, reduce maintenance costs, and improve production efficiency and product quality.

The invention discloses an electrical equipment insulating liquid and a preparation method thereof, and belongs to the technical field of insulating liquid preparation, the preparation method comprises the following steps: sequentially adding trimethylolpropane, caprylic acid, capric acid and oleic acid into a reaction container, then adding toluenesulfonic acid as a catalyst, and carrying out an esterification reaction to obtain a substrate after the esterification reaction; removing the unreacted substrate from the substrate after the esterification reaction by using a vacuum distillation method to obtain a distilled product; and naturally cooling the distilled product, carrying out alkali refining treatment by using a sodium hydroxide solution, washing by using ultrapure water to remove sodium salt in the alkali refining process, adsorbing by using an adsorbent to remove moisture and polar impurities, carrying out vacuum drying, and finally filtering by using a filter membrane to generate the trimethylolpropane caprylic / capric trioleate insulating liquid. The problem of low ignition point of the trimethylolpropane ester insulating liquid can be solved, and the insulating liquid has excellent electrical performance and is suitable for electrical equipment such as transformers.

The invention relates to the technical field of agricultural product processing, and particularly discloses a preparation method for deodorizing enzymolysis oyster juice. According to characteristic fishy smell substances in different processing stages of the enzymolysis oyster juice, physical adsorption and fermentation methods are adopted to reduce or remove the fishy smell substances, the content of flavor substances such as aldehydes and alcohols is increased, meanwhile, esterification reaction is strengthened, 1-pentene-3-ol with fruity flavor is increased, the aroma coordination degree of the oyster juice is optimized, and the quality of the oyster juice product is improved. Moreover, main flavor substances of the oyster juice are effectively retained through a physical adsorption and fermentation dual-treatment method, main fishy smell substances (1-octylene-3-alcohol, dimethyl disulfide and valeraldehyde) of the enzymolysis oyster juice can be effectively removed, meanwhile, 1-pentene-3-alcohol with fruity flavor is increased, and the yield of the oyster juice is increased by about 50%.

The invention discloses a preparation process of rosin modified acrylic acid solid resin. The preparation process comprises the following steps: esterifying refined rosin and an acrylic acid functional monomer in the presence of a catalyst and a polymerization inhibitor by using a solid-phase synthesis method to obtain a polymerizable rosin functional monomer; then adopting a semi-continuous solution polymerization method to obtain an acrylic resin solution with the solid content of 30-60%; then carrying out vacuum distillation to obtain an acrylic resin concentrated solution with the solid content exceeding 60%; and continuously extruding the acrylic resin concentrated solution to discharge solids, granulating to obtain low-VOC rosin modified acrylic resin particles, and separating the solvent in the concentrated solution from the unreacted residual polymerizable rosin functional monomer. The process flow is simple, safe and reliable, the production efficiency is high, the product manufacturing cost is low, VOC is low, and the rosin modified acrylic acid solid resin which has good adhesive force to PE and PP and good wetting dispersity to organic pigments can be obtained, and the acid value, the Tg value, the molecular weight and the molecular weight distribution can be adjusted and controlled.

The invention discloses a preparation method of sodium octenyl succinate starch based on an alcohol-free esterification system. The method comprises the following steps: adding an emulsifier to octenyl succinic anhydride, stirring and heating, emulsifying with water through shearing and high-pressure homogenization to obtain an octenyl succinic anhydride emulsion; adding the octenyl succinic anhydride emulsion to starch for esterification reaction to obtain esterified starch; dehydrating the esterified starch through a vacuum dehydrator, washing with water, and then airflow drying to obtain sodium octenyl succinate starch. The preparation method of sodium octenyl succinate starch based on the alcohol-free esterification system reduces the use of organic reagents in the SSOS production process, improves the uneven dripping of octenyl succinic anhydride, the low efficiency of esterification reaction, the long drying time and low efficiency of sodium octenyl succinate starch, and the uneven heating that easily produces gelatinization.

The present invention relates to the field of catalyst technology, and in particular to the application of a solid base catalyst for catalytic synthesis of an alcohol ester twelve containing a high primary ester, wherein isobutyraldehyde is used as a raw material, 2,2,4-trimethyl-1,3-pentanediol and isobutyric acid are obtained by aldol condensation and Cannizzaro reaction under alkaline catalyst conditions, and then the two are esterified to obtain a product. The advantages of the present invention are: few reaction steps, streamlined process, wide source of reactants, moderate price, easy preparation of catalysts, and large-scale production; the content of the prepared product primary fatty alcohol ester twelve is greater than 70%, meeting the requirements of industrial products; the catalyst is easily separated from the product, meeting environmental protection requirements.

This utility model discloses a polyester esterification temperature control device, including a reaction vessel and a motor. The reaction vessel is equipped with a stirring rod connected to the motor. The reaction vessel is connected to a temperature sensing component and a temperature control component. The temperature sensing component includes a shell mounted on the reaction vessel, with a thermal expansion element disposed inside the shell. The thermal expansion element is slidably connected to a speed regulating element. The shell is equipped with a proximity switch that can cooperate with the thermal expansion element. The temperature control component includes a water pipe disposed on the outer wall of the reaction vessel, with a valve connected to a high-temperature pipe and a low-temperature pipe. The valve cooperates with the proximity switch. This utility model can achieve uniform temperature distribution inside the reaction vessel during the polyester esterification process, reduce the heating temperature of the reaction vessel, and remove heat from the reaction vessel, thereby cooling the reaction vessel and facilitating a better esterification reaction.

The application discloses a kind of di (propyl-2-alkenyl) furan-2, 5-dicarboxylic acid ester and preparation method thereof, it is related to biomass-based organic synthesis method technical field.The method with 2, 5-furan dicarboxylic acid as base material, by esterification reaction under the action of inorganic metal catalyst, will be grafted in 2, 5-furan dicarboxylic acid on allyl, obtains di (propyl-2-alkenyl) furan-2, 5-dicarboxylic acid ester.Compared with traditional synthesis method, the required reaction condition is relatively mild, without high temperature and high pressure environment, not only reduce energy consumption, also reduce operating risk and equipment cost.Mild reaction condition is also more conducive to keeping the activity and selectivity of catalyst, improves reaction efficiency.The obtained product is high in purity, without complex post-processing step can be directly used in subsequent application or further chemical conversion, improves overall production efficiency.The application provides a new idea for 2, 5-furan dicarboxylic acid and other biomass materials to realize high value-added utilization.

The invention discloses a preparation method of 2, 6-naphthalic acid glycol ester, which belongs to the technical field of organic chemical synthesis, and comprises the following steps: firstly, mixing 2, 6-naphthalic acid and ethylene glycol according to a molar ratio of 1: 2 to 1: 3; secondly, 0.1%-0.5% of a catalyst is added into the mixture, and 0.2% of butyl titanate is particularly used as the catalyst in the embodiment; then reacting the mixture at a temperature of 100 DEG C to 150 DEG C for 4 to 6 hours; finally, unreacted ethylene glycol and generated moisture are removed through vacuum distillation, a solid-phase extraction column is used for further purifying the product to improve the purity and yield of the product, the method is characterized in that MOFs is used for carrying out loading treatment on butyl titanate in the aspect of use and treatment of the catalyst, and in addition, by adding magnetic MOFs, the purity of the product is greatly improved. The method realizes rapid recovery and reuse of the catalyst, greatly improves the environmental friendliness and economic benefits of the whole production process, and has important practical value and wide application prospects.

The production and preparation system comprises an esterification kettle, a condenser and a methanol recovery tank, a jacket is mounted outside the esterification kettle, a vertical rotating shaft is rotatably mounted at the top end of the esterification kettle, the bottom end of the vertical rotating shaft extends into the esterification kettle, and a buffer container is fixed outside the vertical rotating shaft; a stirrer is fixed to the bottom end of the vertical rotating shaft, and the vertical rotating shaft is hollow and communicates with the buffer container. The liquid distributor comprises a distribution pipe and a liquid spraying pipe, a horizontal movable rod with a reset spring and a sealing plug are arranged in the distribution pipe, and intermittent spraying of methyl alcohol can be achieved; and a pressurizing piston and an elastic telescopic rod in the buffer container can pressurize methanol. The vertical driving box, the cleaning scraper and the scraper blade in the esterification kettle can be combined to clean the kettle wall, so that the mixing effect can be improved, material residues are prevented, the maintenance cost is reduced, and the production efficiency and the product quality are improved.

The invention discloses a preparation method of carbendazim, and relates to the technical field of carbendazim preparation, and the technical key points are as follows: the preparation method comprises the following steps: hydrolyzing lime nitrogen to generate a cyanamide calcium hydrogen turbid solution, and esterifying the cyanamide calcium hydrogen turbid solution with methyl chloroformate to obtain a cyanamide methyl formate turbid solution; adding carbonate and introducing carbon dioxide to 2-3 atmospheric pressures, stirring for 1-2 hours to precipitate calcium carbonate, and filtering to obtain clear liquid; and finally, condensing the clear liquid and o-phenylenediamine under an acidic condition, filtering, washing and drying to obtain a carbendazim finished product. The filtering effect of cleaning cyanamide waste residues can be improved, and the influence on the purity of a final product is reduced.