Defoamer Oil Phase Composition for High-Temperature Stability
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Solution Overview
Problem
Existing defoamers based on oil-in-water emulsions used in the paper industry lose effectiveness at temperatures above 35 °C, particularly in closed water circuits where temperatures rise, leading to decreased performance.
Innovation Solution
The development of defoamers with an oil phase comprising at least one alcohol with 12 carbon atoms, fatty acid esters from alcohols with 22 carbon atoms, and distillation residues from oxosynthesis or the Ziegler process, combined with polyglycerol esters, which contribute 51 to 80% by weight to the emulsion, enhancing stability and effectiveness at higher temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional oil-in-water emulsion defoamers are used, then they provide effective foam control at low temperatures, but they lose effectiveness when temperature rises above 35°C
Solution Approach 1:
The patent changes the chemical composition parameters of the oil phase by incorporating specific long-chain alcohols (C12-C26), fatty acid esters, and polyglycerol esters with controlled esterification degrees. These compositional changes enable the defoamer to maintain stability and effectiveness across a broader temperature range, particularly above 35°C where conventional defoamers fail.
Solution Approach 2:
The invention creates a composite oil phase system combining multiple components: alcohols with 12-26 carbon atoms, fatty acid esters of mono- to trihydric alcohols, and polyglycerol esters (20-80% by weight). This composite structure synergistically provides both low-temperature foam control and high-temperature stability, resolving the temperature-effectiveness contradiction.
2Reliability
If the oil phase content is increased to improve high-temperature stability, then effectiveness at temperatures above 40°C improves, but the complexity of formulation increases
Solution Approach 1:
The patent optimizes the oil phase content to 50-80% by weight of the total emulsion and controls the polyglycerol ester esterification degree at 20-100%. By precisely controlling these parameters, the formulation achieves high-temperature effectiveness while maintaining manageable formulation complexity through standardized compositional ranges.
3Reliability
If larger amounts of defoamer are used to maintain effectiveness at high temperatures, then foam control improves, but transport costs and application efficiency worsen
Solution Approach 1:
The optimized oil phase composition with 50-80% content and specific polyglycerol ester ratios enhances the defoamer's intrinsic effectiveness, allowing reduced dosage while maintaining performance. This parameter optimization directly addresses the contradiction between performance and quantity required.
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
These defoamers maintain or improve effectiveness at temperatures above 40 °C, providing efficient foam control and deaeration in pulp cooking, pulp refining, and papermaking processes, while requiring smaller amounts and reducing transport costs.
Implementation Method 1
defoamers based on oil-in-water emulsions
Implementation Method 2
the oil phase contains at least one alcohol with at least 12 carbon atoms, fatty acid esters from alcohols with at least 22 carbon atoms and C 1 to C 36 carboxylic acids
Data Source
AI summary
Anti-foaming agent for the paper industry made from oil-in-water emulsions, the oil phase of which contains (a) at least one alcohol with at least 12 C atoms, fatty acid esters of alcohols with at least 22 C atoms and C1 to C36carboxylic acids, distillation residues obtained from the production of alcohols with a carbon count of at least 8 by oxosynthesis or the Ziegler method and which are optionally alkoxylated, mixtures of the above compounds and/or (b) at least one fatty acid ester of C12- to C22 carboxylic acids with mono- to tri-valent C1- bis C18 alcohols and optionally (c) at least one hydrocarbon with a boiling point above 200 oC or a fatty acid with 12 to 22 carbon atoms, (d) 1 to 80 wt. % of polyglycerine esters, obtained by at least 20% esterification of polyglycerine mixtures of: 0 to 10 wt.% monoglycerine, 15 to 40 wt.% diglycerine, 30 to 55 wt.% triglycerine, 10 to 25 wt.% tetraglycerine, 0 to 15 wt.% pentaglycerine, 0 to 10 wt.% hexaglycerine and 0 to 5 wt.% more highly condensed polyglycerines with at least one fatty acid with 12 to 36 C atoms and the oil phase makes up 50 to 80 wt.% of the oil-in-water emulsion.