5results about How to "High esterification rate" patented technology

A boron-containing polyethylene glycol fatty acid ester surfactant belongs to the field of organic chemistry and functional materials. The boron-containing polyethylene glycol fatty acid ester surfactant is prepared as follows: polyethylene glycol (PEG), boric acid and fatty acid are used as raw materials, first esterification reaction of the PEG and the boric acid is performed, then esterification reaction of the PEG and the fatty acid is performed to obtain boron-containing poly ethylene glycol fatty acid ester; by changing the species of fatty acids and catalysts and molecular weight of the PEG, the esterification rate can be enhanced, the boron-containing poly ethylene glycol fatty acid ester product can be used as a surfactant, and the boron-containing poly ethylene glycol fatty acid ester can reduce water surface tension and has good emulsifying properties.

The present invention relates to the technical field of metal organic framework materials, and discloses a metal organic framework material having a sulfonyl benzene ring structure, a preparation method and application thereof, and a method for esterification of carboxylic acids. The ligand of the metal organic framework material is provided by a substance having a structure as shown in formula (1), and the coordination metal M is selected from one of Zr, Cr and Al; in formula (1), M' is selected from one of H, Li, Na, K, Cs, Ca and Mg. The metal organic framework material provided by the present invention has excellent specific surface area, pore volume, pore diameter and acid density, and when used in esterification reactions, especially esterification reactions of carboxylic acids and alcohols, it can effectively improve the esterification rate of carboxylic acid esterification reactions. It has broad application prospects.

The invention relates to the technical field of enzyme engineering, in particular to an immobilized enzyme preparation as well as a preparation method and a use method thereof. The immobilized enzyme preparation comprises lipase, an auxiliary agent A and an auxiliary agent B in a mass ratio of (5-8): (20-50): (60-100), the lipase is selected from lipase from aspergillus oryzae and lipase from rhizomucor miehei, and the mass ratio of the lipase to the lipase is (2-4): 1; the auxiliary agent A is composed of rapeseed meal and diatomite; and the auxiliary agent B comprises konjac glucomannan gel and an emulsifier. The catalyst has the advantages of high reaction activity and capability of being recycled for multiple times.

This invention belongs to the field of polymer materials technology, specifically relating to a method for producing polyaromatic-carbonic-aliphatic copolyester, comprising the following steps: mixing an aromatic diacid and an aliphatic diol and feeding them into a first esterification reactor, adding an esterification catalyst to carry out an esterification reaction to obtain an esterification product; mixing the aliphatic diol evenly and feeding it into a second esterification reactor, then adding diester carbonate and an esterification catalyst to the second esterification reactor to react and obtain an esterification product; feeding the esterification product into a monomer removal reactor to obtain a monomer removal product; mixing the esterification product and the monomer removal product with a polycondensation catalyst and a stabilizer, and after shear homogenization, feeding it into a pre-polycondensation reactor to react and obtain a pre-polycondensation product; feeding the pre-polycondensation product into a final polycondensation reactor to react and obtain a copolymer, and then water-cooling and granulating to obtain the copolyester product. The production method provided by this invention can shorten the final polycondensation reaction time and improve the weight-average molecular weight and mechanical strength of the prepared copolyester.

This invention provides a method for preparing an esterified defoamer, belonging to the field of organic synthesis technology. The method includes the following steps: C1618 alcohol, oleyl alcohol, maleic anhydride, and a bimetallic cyanide complex are added to a reaction vessel, purged with nitrogen, and heated to 135-150°C. A mixture of propylene oxide and ethylene oxide is first introduced to induce a reaction; after successful induction, the mixture is continuously introduced. After the introduction of the propylene oxide and ethylene oxide mixture is completed, the reaction continues at 140-150°C. After the reaction is complete, nitrogen is pressurized to a pressure of 0.3-0.5 MPa inside the vessel, and the reaction is carried out at 80-130°C for 5-7 hours. Vacuum is then applied, and the temperature is lowered to obtain the esterified defoamer. This method eliminates the need for secondary addition of esterification monomers and esterification catalysts, resulting in a simple and safe reaction process, significantly reduced production costs, and a high esterification rate. The obtained esterified defoamer exhibits good defoaming and foam-suppressing properties.