Method for controlling a rectification column
AssigneeCovestro Deutschland AG
InventorsMathias Schweigert, Achim Küpper
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Abstract
The present invention relates to a method of controlling a concentration of a first component of a rectification column for separating a binary mixture of the first component with a second component on the basis of temperature measurements, wherein a control path defined by temperature sensors (T3, T2, T6) arranged in the longitudinal direction of the column is linearized with the aid of an estimated temperature profile, wherein a real temperature profile T*(h), determined by means of the temperature sensors, is approximated by a function T(h) in dependence on a column height h, wherein the column id divided into two sections along the column height h and the function T(h) is defined section by section on the basis, in each case, of a logistical function.
Claims16
A method of controlling a concentration of at least one first component in a rectification column for separation of a binary mixture of the first component with a second component based on temperature measurements, the method comprising:
- (a) linearizing a control zone defined by temperature sensors arranged in the longitudinal direction of the rectification column with the aid of an estimate of a temperature profile, and
- (b) approximating a real temperature progression T*(h) determined by means of the temperature sensors by a function T(h) as a function of a column height h, wherein:
- (i) the column is divided into two sections over the column height h, and
- (ii) the function T(h) is defined in sections on the basis of one logistic function in each section.
Dependencies are inferred from the claim text.