Ester quaternary ammonium salt (EQ) as an excellent biodegradable cationic surfactant, has been widely used in textile, printing and dyeing, leather, synthetic fiber, paper making and machinery industries, which is a typical kind of“green softener”. However, some defects, existing in the production process of EQ, cause the product quality and preparation process should be improved. Further more, quaternary ammonium agent used in the production process of EQ was toxic, which should be improved too. Di...
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