Process for the production of polycarbonate of constant viscosit

Details Process for the production of polycarbonate of constant viscosit Process for the production of polycarbonate of constant viscosit

1994-01-31

1995-05-02

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

526 59, 526 60, 528198, 528199, 528204, 528125, 528126, 528171, 528174, C08G 6400

Patent

active

054120608

ABSTRACT:
The invention relates to a process for the production of polycarbonates by the two-phase interfacial method in which deviations between measured and estimated variables are continuously minimized by means of a suitably selected observer or filter system on the basis of a process model with an empirical Mark-Houwink relation adapted to the process. The variables estimated by the observer/filter are converted into control variables which are used to set input streams of the production process. Product quality is kept constant, changes in load or set values are quickly intercepted and even disturbances not readily accessible to measurement are taken into account by the process control.

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