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It usually exists in the form of brownish powder or viscous liquid, and is essentially an anionic surfactant.
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Sulfonated tannin refers to a tannin compound that has been modified with sulfonic acid groups, acquiring properties such as dispersion, stain removal, and metal ion affinity.
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Sulfonated lignite (SMC) is a derivative of lignite humic acid. It is synthesized from lignite under the conditions of a sulfonating agent and an appropriate temperature.
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Tannic acid solution, also known as sodium tannate, is prepared through a chemical reaction between organic weak acid tannin and caustic soda (NaOH).
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