METHOD OF CONTROLLING WATER WASHING OF OXIDATE IN CAPROLACTAM PRODUCTION Russian patent published in 2013 - IPC C07C13/18 C07C27/28 C07C45/82 C07C29/80 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of controlling water washing of oxidate in production of caprolactam, which is carried out in a fractionation column while feeding a reaction mixture, controlling temperature conditions using an external heat exchanger and removing the distillate and bottom product through condensers. The method is characterised by that it further includes a pump for feeding oxidate, which is connected to the first input of the oxidate heat exchanger, the second input of which is connected to a cyclohexane container; the first output of the oxidate heat exchanger is connected to the first input of a mixer, the second input is connected to a pump for feeding water-organic distillate into the container, and the first output is connected to the first input of the main separation vessel, the second output of which is connected through the mixer to the first input of an additional separation vessel, its second input is connected to a pump for feeding condensate from a collector having a flow sensor and a valve, and its first output is connected to a pump for feeding a water-acid layer into a pipe for feeding the water-organic distillate into the mixer and into a feeding pipe having a flow sensor and a valve from the mixer into the additional separation vessel having a level sensor and a valve, its second output is connected through the valve to a concentration pipe, and the third output is connected to an oxidate neutralisation pipe. The first output of the main separation vessel having a pressure sensor, a level sensor and a valve is connected through a filter to a heat exchanger for stripping organic matter, having a vapour flow sensor and a valve and with a fractionation column. There are also pipes for connecting a hydraulic gate with a distillate collector, which are connected to condensers, wherein the first output of the condensate collector is connected by a pipe to the top of the fractionation column having a vapour flow sensor and a valve, and the second and third outputs of the distillate collector feed the distillate through the pipes to the next processing steps.

EFFECT: use of the present invention improves control of separating cyclohexanol and cyclohexanone, and reduces caprolactam loss and alkali consumption.

4 cl, 1 tbl, 1 dwg