7results about "Oxygen-containing compound preparation" patented technology

Depolymerization of polyalkylene terephthalate resin using Alcosilis, providing a superior depolymerization method. [Solution] The method for depolymerizing a polyalkylene terephthalate resin according to the present disclosure is a method for depolymerizing a polyalkylene terephthalate resin by alcoholization of the polyalkylene terephthalate resin, wherein the polyalkylene terephthalate resin includes a polybutylene terephthalate resin, and the alcohol used for alcoholization contains tetrahydrofuran in a proportion of more than 0 ppm by mass and 100,000 ppm or less by mass.

This invention provides a novel method for manufacturing fluorinated carboxylate compounds, for producing formula (P1): (B 1f ) mp (A) 1 ) np [B] 1f RfCOO; Rf is a hydrocarbon group having one or more fluorine atoms; A 1 It is a group other than H; mp is (A 1 The valence of () × np and is 1 or 2; np is mp / (A 1 The valence of A is 1; 1 The method of manufacturing a compound having a valence of 1 or 2 includes: making formula (S1): (B 1f (R) 1 ) [R 1 The compound shown is an organic group and is related to formula (S2): (A 1 ) ms2 (B) 2 ) ns2 [B] 2 It is OH, CO3 or HCO3; ms2 is (B 2 (valence) × ns2 / (A) 1 The valence of ns is 1 or 2; ns2 is (A 1 (value) × ms² / (B) 2 The reaction of the compound or its hydrate shown in the figure (with a valence of 1 or 2) is a step A.

This invention provides a method for recrystallizing propionate, characterized in that the method includes dissolving crude propionate in a recrystallization solvent at a first temperature, then adding seed crystals and cooling to a second temperature for recrystallization, followed by filtration and drying to obtain purified propionate; wherein the recrystallization solvent comprises alcohol and water; the volume ratio of water to alcohol in the recrystallization solvent is 1:1-20; and the second temperature is 10-90°C lower than the first temperature. The method of this invention is not only simple in process and convenient to operate, with high yield, but also yields propionate crystals with high purity.

Method for the reprocessing of a poly(meth)acrylate-containing adhesive mass, comprising the following process steps: a) Manufacturing or providing a starting composition comprising one or more poly(meth)acrylates, each comprising a plurality of organic residues linked via an ester bond -OR 1i , where R 1i For each residue i, independently of the other residues, is selected from the group consisting of linear and branched hydrocarbon residues with 1 to 25 carbon atoms, b) Combining the starting composition with a solvolysis composition comprising one or more solvolyses, wherein the solvolyses are selected from the group consisting of water, monohydric alcohols of the formula HO-R 2i , where R 2i selected is from the group consisting of linear and branched hydrocarbon residues with 1 to 3 carbon atoms, where R 2i at least partially from R1i is different, and higher alcohols with 2 or 3 carbon atoms, to obtain a reaction composition, and c) Performing solvolysis by cleaving ester bonds to the organic residues -OR 1i in the poly(meth)acrylates contained in the reaction composition, to obtain a product composition, comprising: i) one or more recovered alcohols of the formula HO-R 1i , and ii) one or more reaction products of the poly(meth)acrylates with the solvolyzing agent(s), d) Separating the recovered alcohols from the product composition.

The present invention provides, inter alia, a process for preparing a compound of formula (I) wherein the substituents are as defined in claim 1. JPEG2025515043000048.jpg33159

The invention provides a synthesis method of 3, 5-bis (difluoromethyl) benzoic acid, which relates to the technical field of organic chemical synthesis and comprises three steps of reaction. The preparation method specifically comprises the following steps: by taking 5-bromoisobenzene dialdehyde as a raw material, firstly reacting with diethylamino sulfur trifluoride to obtain 1-bromo-3, 5-bis (difluoromethyl) benzene; the preparation method comprises the following steps: inserting carbonyl into 1-bromo-3, 5-bis (difluoromethyl) benzene to obtain 3, 5-bis (difluoromethyl) methyl benzoate; and finally hydrolyzing the 3, 5-bis (difluoromethyl) methyl benzoate to obtain the 3, 5-bis (difluoromethyl) benzoic acid. The synthesis method disclosed by the invention is short and feasible in route, cheap and easily available in raw materials and auxiliary materials, high in reaction activity, simple to operate and easy to control, and a target product can be well obtained.