METHOD OF CONTROLLING CAPROLACTAM DISTILLATION PROCESS Russian patent published in 2012 - IPC C07D201/16 B01D11/04 G05D27/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a novel method of controlling the caprolactam distillation process, involving controlling the process of three-step distillation of caprolactam in the presence of an alkali, comprising collectors, evaporators, steam ejectors, condensers, while feeding crude caprolactam and steam and removing purified caprolactam, condensate, connected by pipes, further comprising pumps for feeding crude caprolactam and alkali with flow sensors, a valve and a filter; a packed column of dehydrated caprolactam for the first evaporator; condensers for the second evaporator; a high-boiling impurity evaporator connected to the third evaporator; a pump for feeding dehydrated caprolactam with a flow sensor and a valve to the second evaporator; a pump for feeding crude caprolactam with a flow sensor and a calve to the third step; a pump for feeding purified caprolactam with a flow sensor, a valve and filters; a pump for feeding wastes to the next steps; vacuum metres; a temperature sensor and a pressure sensor with valves for feeding steam into the evaporator, mounted on pipes; flow of crude caprolactam and alkali into the evaporators is set, as well as limiting values of temperature, residual pressure, pressure of heating steam in the evaporators and steam ejectors; current deviation of said parameters is determined and the valves for feeding steam into the evaporators and steam ejectors are adjusted accordingly, and purified caprolactam is directed further and wastes are taken for neutralisation.

EFFECT: method increases efficiency of distilling crude caprolactam and quality of the output caprolactam.

5 cl, 1 ex, 1 tbl, 1 dwg