Arrangement and method for treatment of bleaching chemical residues

EP4612365A1Pending Publication Date: 2025-09-10UPM KYMMENE OYJ
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Patent Information

Application Number
EP2023800883
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2022-11-02
Filing Date
2023-10-27
Publication Date
2025-09-10

AI Technical Summary

Technical Problem

Current methods for determining sodium bisulphite levels in industrial processes, such as wood processing, are uncertain and time-consuming, leading to slow feedback loops and inefficient process control, particularly in treating bleaching chemical residues that weaken fibre colour and strength.

Method used

Implementing spectroscopy-based measurement systems for real-time determination of sodium bisulphite levels directly within the process flow, eliminating the need for laboratory sampling and enabling continuous, accurate control of sodium bisulphite concentration and flow rate in bleaching processes.

Benefits of technology

This approach significantly reduces measurement uncertainty and improves process control by providing real-time, accurate feedback, ensuring optimal treatment of bleaching chemical residues and maintaining fibre strength and colour integrity.

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Abstract

An arrangement (1) for treatment of bleaching chemical residues arrangement comprises a detector (2) arranged inside a process flow and configured to measure an amount of sulphite in the process flow by means of spectroscopy. The arrangement (1) further comprises a controller (3) connected to the detector (2) to receive measurement data from the detector (2) and configured to determine an amount of sodium bisulphite in the process flow based on the measurement data, and to control a process related to treatment of bleaching chemical residues based on the determined amount of sodium bisulphite in the process flow.
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