Reduction of chemical footprint in Kraft paper mills

Reduction of chemical footprint in Kraft paper mills

Kraft paper mills use large amounts of strong alkaline pulping solutions that are continuously spent and recovered during manufacturing. Efficient operation and consistent quality specifications depend largely on tight control of the mill’s recovery lines and causticizing degree. The existing “ABC” laboratory test on the pulping solutions involves time-consuming analysis procedures and does not fully enable operators to control the (re)causticizing process, resulting in loss of productivity and energy losses. Debottlenecking and stabilizing the causticizing process starts with process transparency.

AppliTek’s newly developed UPA® automatic (on-line) titration system is built specifically for causticizing processes, enabling operators to monitor simultaneously all critical alkaline parameters: sodium hydroxide (NaOH), sodium carbonate (Na2CO3) and sodium sulfide (Na2S). The system is a major improvement fit in a process control strategy for debottlenecking and stabilizing the causticizing process, while keeping conformity with conventional industry-standard tests.

In a field setup, process analyzer was equipped with a special valve panel for measuring 4 streams, with settler systems specifically for the slaker and causticizer streams. Since the controller software of the analyzer controls the loop valves of the sampling system, it is possible to adjust the sequence of the streams as per customer’s requirements.

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