6results 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 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.

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.

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.