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  • Once the cellulose is in its alkali form, it is treated with ethylene oxide in a controlled environment. The etherification process introduces hydroxyethyl groups to the cellulose chains, resulting in hydroxyethyl cellulose. The reaction conditions, including temperature, concentration of reactants, and reaction time, are carefully controlled to regulate the degree of substitution (DS) of the hydroxyethyl groups. A higher DS often leads to improved solubility and thickening properties, making it essential to optimize this parameter according to the intended application of the HEC.