Composite Anti-foaming Agent for Pulp Production Stability
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Solution Overview
Problem
Existing anti-foaming agents used in pulp production processes are unstable in harsh environments such as high temperatures and strongly alkaline conditions, leading to the formation of undesirable aggregates that reduce the efficiency and quality of pulp production.
Innovation Solution
A pulp production method utilizing an anti-foaming agent composed of organopolysiloxane, finely powdered inorganic filler, polyoxyalkylene group-containing branched chain organopolysiloxane, and an anionic surfactant, which suppresses the generation of aggregates and maintains stability in harsh conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional anti-foaming agents are used in harsh environments (high temperature and strongly alkaline conditions), then foaming is suppressed initially, but the anti-foaming agent becomes unstable and forms aggregates that reduce production efficiency and quality
Solution Approach 1:
The patent uses a composite anti-foaming agent system comprising organopolysiloxane, finely powdered inorganic filler, polyoxyalkylene group-containing branched chain organopolysiloxane, and anionic surfactant. This composite formulation maintains stability in harsh environments while suppressing foaming, resolving the contradiction between immediate foaming control and long-term reliability.
2Reliability
If the anti-foaming agent forms aggregates in harsh conditions, then the stability deteriorates, but this leads to reduced pulp production efficiency and quality
Solution Approach 1:
The composite formulation with organopolysiloxane, inorganic filler, branched chain organopolysiloxane, and anionic surfactant creates a stable system that prevents aggregate formation, thereby maintaining both reliability and productivity simultaneously.
Solution Approach 2:
The patent modifies the chemical parameters of the anti-foaming agent by using specific molecular structures (branched chain organopolysiloxane with polyoxyalkylene groups) and formulations that change the stability characteristics under harsh conditions, preventing aggregation while maintaining foaming suppression and production efficiency.
3Loss of substance
If black liquor is recovered and concentrated through evaporation to reduce pure water usage, then water consumption is reduced, but the concentration process requires energy input and the recovered effluent must be reused
Solution Approach 1:
The stable anti-foaming agent enables effective foaming control during the evaporation and concentration processes, allowing the system to handle the recovered black liquor efficiently without additional stabilizing measures, thus supporting the water reduction strategy while managing the energy-intensive concentration process.
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 anti-foaming agent effectively suppresses foaming in pulp production processes, ensuring high-quality pulp production with improved efficiency by maintaining stability and preventing aggregate formation even at high temperatures and alkaline pH levels.
Implementation Method 1
Black liquor contains surface active substances such as lignins and sodium salts of resin components, and therefore causes foaming... the anti-foaming agent effectively suppresses foaming in pulp production processes
Implementation Method 2
A pulp production method utilizing an anti-foaming agent composed of organopolysiloxane, finely powdered inorganic filler, polyoxyalkylene group-containing branched chain organopolysiloxane, and an anionic surfactant, which suppresses the generation of aggregates and maintains stability in harsh conditions
Data Source
AI summary
An anti-foaming agent containing (A) an organopolysiloxane and a finely powdered inorganic filler, (B) a polyoxyalkylene group-containing branched chain organopolysiloxane, and (C) an anionic surfactant. This anti-foaming agent exhibits stable anti-foaming performance even at high temperatures that reach, for example, 80QC or under strongly alkaline conditions and produces no aggregates.