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Lignin, a renewable organic polymer second only to cellulose in abundance, constitutes a valuable component in papermaking effluents containing free alkali, sulfides, and organic compounds. Shanghai Keysino pioneers resource-efficient lignin valorization, transforming this underutilized biomass into high-volume, cost-competitive products through advanced recovery technologies, thereby aligning with circular economy objectives.

In alkaline pulping waste, lignin primarily exists as lignosulfonates and alkali lignin. Keysino’s state-of-the-art membrane separation systems enable precise extraction and purification of lignosulfonates from sulfite pulping red liquors, enhancing product value by 30-40%. The technology simultaneously isolates lignin-derived vanillin and other aromatic compounds through molecular weight-selective separation, achieving over 90% purity levels. This dual-output process not only enables closed-loop resource utilization but also reduces wastewater COD by 60-70%, establishing an industrial paradigm for zero-waste pulping operations.