Preparing propoxylated phosphorus product, useful as e.g. flame preventive agent, comprises reacting phosphorus trihalide and/or phosphorus oxyhalide with aluminum trichloride followed by reacting with alkylene oxide and alkali washing

摘要

Preparation of acid less propoxylated phosphorus containing product with specific isomer ratio by reaction of phosphorus trihalide and/or phosphorus oxyhalide with alkylene oxide, comprises: (a) reacting phosphorus trihalide and/or phosphorus oxyhalide with aluminum trichloride continuously; (b) transferring the reaction product of step (a) into a reactor and reacting with alkylene oxide; and (c) performing a simple alkali wash on the raw product after removal of excess alkylene oxide. An independent claim is included for the acid less propoxylated phosphorus containing product (A) with specific isomer ratio, obtained by reaction of phosphorus trihalide and/or phosphorus oxyhalide with alkylene oxide, where the reaction of phosphorus oxychloride with propylene oxide gives a product mixture containing tris(2-chloro-1-methyl-ethyl) phosphate (I), bis(2-chloro-1-methyl-ethyl)-2-chloro-propyl phosphate (II), 2-chloro-1-methyl-ethyl-bis(2-chloro-propyl) phosphate (III) and tris(2-chloro-propyl) phosphate (IV) isomers; the ratio of the isomers (I)/(II) in the mixture is greater than 4; and the amount of (I) in tris(chloropropyl)phosphate isomer mixture is at least 70%.