Sulfonated Lignin Dispersants for Soil Redeposition Control
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Solution Overview
Problem
There is a high demand for bio-based, eco-friendly, and cost-effective dispersants for laundry detergent compositions that can effectively prevent soil redeposition on fabrics, as existing petroleum-derived dispersants are costly and environmentally unfriendly.
Innovation Solution
The use of sulfonated lignin derivatives with a specific combination of degree of sulfonation and carboxylate content, obtained from industrial sulfite pulping or Kraft pulping, as additives in laundry detergents, which do not require additional laboratory synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If petroleum-derived dispersants (ethoxylated polyalkylene imines and polycarboxylates) are used, then effective soil dispersing performance is achieved, but ecological friendliness deteriorates and cost increases
Solution Approach 1:
The patent transforms lignin from a hydrophobic biopolymer with aromatic backbone into a hydrophilic sulfonated derivative by introducing sulfonate groups. This parameter change in chemical structure enables the material to function as an effective dispersant while maintaining bio-based origin, thus resolving the contradiction between performance and ecological friendliness
Solution Approach 2:
The patent utilizes lignin, an abundant renewable resource from wood pulp, as a cost-effective alternative to expensive petroleum-derived dispersants. By using a readily available biopolymer that can be easily modified, the invention reduces both cost and environmental impact while maintaining functional effectiveness
2Reliability
If laboratory chemical synthesis is used to prepare lignin derivatives, then effective dispersant properties are achieved, but manufacturing cost and environmental impact increase
Solution Approach 1:
The patent employs a two-stage process where lignin is first obtained as a by-product of wood pulp processing, then undergoes in-situ sulfonation using sulfur trioxide. This self-service approach utilizes existing industrial processes and by-products, eliminating the need for separate laboratory synthesis steps and reducing both cost and environmental impact
Solution Approach 2:
The patent recovers and utilizes lignin, which is typically discarded or underutilized as a by-product of wood pulp manufacturing. By recovering this abundant material and converting it into a functional dispersant through simple sulfonation, the invention transforms waste into a valuable product while avoiding expensive synthesis procedures
3Object-affected harmful factors
If native lignin is used directly, then bio-based origin is maintained, but water solubility and effectiveness as dispersant deteriorate
Solution Approach 1:
The patent modifies the chemical parameters of native lignin by introducing sulfonate groups through sulfonation. This transforms the hydrophobic character into hydrophilic properties, enabling water solubility while preserving the bio-based aromatic backbone structure. The degree of sulfonation is controlled to achieve optimal balance between solubility and dispersant effectiveness
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 lignin derivatives effectively reduce and prevent soil redeposition on fabrics during laundry, providing a cost-effective and environmentally friendly solution without the need for additional chemical modifications.
Implementation Method 1
laundry detergent compositions that are capable of removing a wide range of different soils, including hydrophilic and hydrophobic ones
Implementation Method 2
dispersants for dispersing soils and preventing redeposition thereof onto the laundry
Implementation Method 3
laundry detergent compositions comprising a complex mixture of ingredients such as surfactants, chelating agents, enzymes, and builders
Implementation Method 4
the lignin derivative is used for reducing the viscosity of a detergent slurry composition
Data Source
AI summary
The present invention relates to the use of lignin derivatives, having a specific combination of degree of sulfonation and degree of oxidation, as an additive in a laundry detergent composition. Further, the present invention relates to a laundry detergent composition comprising the lignin derivative and to a laundry cleaning method.