Polyalkoxylate Co-Polymers for Lime Mud Dewatering
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Solution Overview
Problem
The Kraft pulping process faces challenges in efficiently recovering minerals, particularly lime, from aqueous suspensions, leading to operational issues such as increased fuel consumption, TRS emissions, and formation of rings in the furnace.
Innovation Solution
A composition comprising polyalkoxylate co-polymers, alkyleneamine alkoxylates, and optionally anionic surfactants is added to the lime mud suspension prior to filtration, enhancing dewatering and reducing water content, thereby improving the efficiency of the lime recovery process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional filtration methods are used for lime mud dewatering, then the process is simple and equipment is basic, but the dewatering efficiency is insufficient leading to high water content in lime mud
Solution Approach 1:
The patent introduces a dewatering aid composition as an intermediary substance between the lime mud suspension and the filtration process. This composition contains specific polymers and surfactants that modify the surface properties of lime mud particles, improving their dewatering characteristics without requiring complex equipment changes
Solution Approach 2:
The patent changes the chemical parameters of the lime mud suspension by adding a dewatering aid composition with specific molecular structures and surface active properties. This alters the interfacial tension and particle surface charge, enabling more effective water separation during filtration
2Use of energy by moving object
If lime mud with high water content is fed to the lime kiln, then less pre-dewatering is required, but fuel consumption increases and TRS emissions increase
Solution Approach 1:
The patent performs preliminary dewatering action by adding a dewatering aid composition before the lime mud enters the filtration and kiln processes. This pre-treatment reduces the water content in the lime mud cake, so that less energy is required for evaporation in the lime kiln and fewer TRS emissions are generated
3Reliability
If the dewatering aid is unstable at elevated temperatures, then the formulation is simple, but phase separation occurs reducing dewatering performance
Solution Approach 1:
The patent creates a composite dewatering aid formulation containing multiple components with complementary properties: polyalkoxylate co-polymers for steric stabilization, alkyleneamine alkoxylates for electrostatic stabilization, and anionic surfactants for surface activation. This composite structure provides both thermal stability and enhanced dewatering performance
Solution Approach 2:
The patent assigns different functional roles to different components of the dewatering aid composition. Each component is optimized for specific functions: some molecules provide thermal stability through their molecular structure, while others provide dewatering activity through surface active properties, creating a formulation that excels at both requirements
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The use of the described composition results in reduced fuel consumption, increased dry solids in the lime mud, decreased TRS emissions, and improved stability of the suspensions at elevated temperatures, addressing the operational inefficiencies in the Kraft pulping process.
Implementation Method 1
Compositions are added at various points in a Kraft pulping process to aid in the recovery of the lime associated with the Kraft pulping process
Implementation Method 2
composition comprising polyalkoxylate co-polymers, alkyleneamine alkoxylates, and anionic surfactants
Data Source
AI summary
Compositions and methods are provided for the recovery of minerals from mineral suspension, such as lime generated in Kraft pulping processes. More particularly, the composition comprises polyalkoxylate co-polymers, alkyleneamine alkoxylates, and optionally anionic surfactants, that when added to mineral dewatering process, aids in the recovery of the mineral.