METHOD OF SEPARATION OF THE HIGH-BOILING FRACTION OF EPOXIDATE IN THE PROCESS OF THE JOINT PRODUCTION OF PROPYLENE OXIDE AND STYRENE Russian patent published in 2006 - IPC C07C7/04 C07D301/32 

FIELD: chemical industry; methods of production of the aromatic compounds.

SUBSTANCE: the invention is pertaining to chemical industry, in particular to methods of production of the aromatic compounds. The invention presents the method of separation of the high-boiling fraction of epoxidate in the process of joint production of propylene oxide and styrene. The method provides, that the separation of the of the high-boiling fraction of epoxidate in the process of joint production of propylene oxide and styrene is realized by rectification by separation in the first column of the high-boiling products, water and the fraction of methylbenzene; separation from the bottoms product of the first column in the second column of the fraction of benzaldehyde and the bottoms product containing the fraction methylphenylcarbinol. At that from the bottom product of the second column in the third column from the distillate separate the fraction of methylphenylcarbinol, and from the bottom product separate the fractions of the higher-boiling and sodium-containing products. At that into the first column they additionally feed the vapor condensate and-or the steam and-or the nitrogen-containing compound. The nitrogen-containing compound is fed into the rectifying column in amount of 0.001÷ 1.0 mass % in respect to the high-boiling fraction of the epoxidate fed for separation and the vapor condensate and-or the steam - in amount of 0.001÷1.0 mass % in respect to the high-boiling fraction of the epoxidate fed for separation. The technical result of the invention is reduction of the power inputs and the losses of ethylbenzene at separation of the high-boiling fraction of the epoxidate, and also the decreased amount of the high-boiling and sodium-containing products in the separated fraction of methylphenylcarbinol.

EFFECT: the invention ensures reduction of the power inputs and the losses of ethylbenzene at separation of the high-boiling fraction of the epoxidate, and also the decreased amount of the high-boiling and sodium-containing products in the separated fraction of methylphenylcarbinol.

1 dwg, 7 ex