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Almonaityte, Karolina, et al. International Journal of Biological Macromolecules 164 (2020): 2010-2017.
3-Chloro-2-hydroxypropyltrimethylammonium chloride (CHPTAC) is a widely used cationic etherifying agent for the functional modification of polysaccharides. In this study, CHPTAC was employed to synthesize cationic starches (CS) from native potato starch via a semidry etherification process, aiming to achieve high degrees of substitution (DS) while preserving the native microgranular structure.
Under alkaline conditions, CHPTAC reacts with the hydroxyl groups of anhydroglucose units to introduce quaternary ammonium functionalities, imparting permanent positive charges to the starch backbone. By systematically varying the reaction composition, CS samples with DS values ranging from 0.05 to 0.84 and reaction efficiencies up to 99.6% were obtained. Notably, the incorporation of CaO as an additive significantly enhanced cationization efficiency, enabling deeper penetration of CHPTAC into starch granules and a more homogeneous distribution of cationic groups throughout the granule volume.
Comprehensive characterization using FTIR, XRD, SEM, viscoamylography, and solubility analyses confirmed successful etherification without destruction of the granular morphology. High-DS cationic starches prepared with CHPTAC and CaO exhibited improved cold-water solubility and altered rheological behavior, attributes that are highly desirable for applications in papermaking, flocculation, textiles, and food processing.
This case study highlights 3-Chloro-2-hydroxypropyltrimethylammonium chloride as a highly effective and industrially relevant reagent for producing advanced cationic starches with tunable functionality and preserved structural integrity.
Zhai, Xiaolei, et al. RSC advances 12.49 (2022): 31596-31607.
3-Chloro-2-hydroxypropyltrimethylammonium chloride (CHPTAC) is an effective cationic modification reagent widely applied to cellulose-based materials. In this study, CHPTAC was used to chemically modify cotton fabrics to introduce quaternary ammonium groups onto the fiber surface, aiming to enable salt-free dyeing with reactive dyes and to elucidate the associated dyeing mechanism.
Cotton fabrics were treated with an aqueous CHPTAC solution under alkaline conditions, allowing etherification between the epoxide intermediate of CHPTAC and the hydroxyl groups of cellulose. The resulting cationic cotton fibers exhibited a permanent positive charge, significantly enhancing electrostatic attraction toward anionic reactive dyes without the need for inorganic salts. Dyeing experiments demonstrated that the adsorption behavior of reactive dyes on CHPTAC-modified cotton followed the Langmuir isotherm model, indicating monolayer adsorption on homogeneous active sites.
Kinetic analysis revealed that dye uptake conformed to a pseudo-second-order model, suggesting chemisorption as the rate-controlling step. Thermodynamic parameters further showed that dye adsorption on modified cotton was endothermic, in contrast to the exothermic adsorption observed for unmodified cotton fibers. The fixation process was also improved due to increased dye-fiber affinity, resulting in higher dye utilization efficiency.
This case study highlights 3-Chloro-2-hydroxypropyltrimethylammonium chloride as a key reagent for producing cationic cotton fabrics, providing a solid theoretical and practical basis for environmentally friendly, salt-free reactive dyeing in textile manufacturing.
Wu, Wei, et al. Colloids and Surfaces A: Physicochemical and Engineering Aspects 654 (2022): 130082.
3-Chloro-2-hydroxypropyltrimethylammonium chloride (CHPTAC, also referred to as CTA) is an efficient cationic functionalization reagent widely applied in the preparation of polymeric flocculants. In this study, CHPTAC was employed in a one-pot synthesis of lignin-based cationic flocculants (CPKL) using kraft lignin and acrylamide as co-monomers, aiming to enhance lignin's intrinsic flocculation performance for wastewater treatment.
Under alkaline and anaerobic conditions, CHPTAC participated in free-radical graft copolymerization, introducing quaternary ammonium groups onto the lignin backbone. This cationic modification significantly improved the charge density and water solubility of the resulting flocculants. The synthesized CPKL materials exhibited excellent performance in the removal of Congo Red, an anionic azo dye, demonstrating high decolorization efficiency over a wide pH range and across varying dye concentrations.
Jar test results revealed that charge neutralization was the dominant flocculation mechanism, while adsorption-bridging effects became more pronounced at higher contaminant concentrations. Further optimization through gradient acid fractionation of lignin precursors led to CPKL derivatives with superior efficiency at low dosages, particularly the product derived from lignin precipitated at pH 4.
This case study demonstrates that 3-Chloro-2-hydroxypropyltrimethylammonium chloride is a key reagent for the sustainable synthesis of high-performance lignin-based flocculants, offering an environmentally friendly and technically feasible solution for dye-laden wastewater treatment applications.
