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Chemical additive activated carbon: hidden champion of purification and safety Application scenarios: PVC production: removal of vinyl chloride monomer (residue <1ppm) Dye intermediates: decolorization rate >95% (methylene blue value ≥150mg/g) Key parameters: Particle size 200-400 mesh (evenly dispersed in the reaction system) Ash content ≤0.5% (avoid introduction of impurities) Case: A chemical plant used wood charcoal to purify EDTA, and the whiteness of the product was increased to 99.5%. Advantages: chemical inertness, acid and alkali resistance (pH 2-12), REACH compliance.