Process control method

Details Process control method Process control method

G - Physics

01

N

324/23

G01N 27/26 (2006.01)

Patent

CA 1210813

PROCESS CONTROL METHOD ABSTRACT OF THE DISCLOSURE The invention is centered on the discovery of a straight line relationship between sodium ion content and total dissolved solids in the liquor or washer filtrate from a sodium based alkaline pulp treatment stage. Sodium concentration can most conveniently be determined by the use of sodium ion selective electrodes. The relationship holds true in any stream within a given generalized system; e.g., a brownstock washer system or the washer following a caustic extraction stage in a bleach sequence. The dissolved solids information can be used as input for process control. As one example, the drop leg on the final stage of a brownstock washer system can be instrumented and used to control shower water. This enables the system to turn out a washed product in which the residual dissolved solids are held within close limits. An Important co-benefit lies in the uniform composition of the washer filtrate and the corresponding weak liquor stream to the recovery system evaporators. An Instrumented brownstock washer can also provide feed forward information and control to a bleach plant or brown paper sheeting operation.

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