造纸黑液超临界水气化制氢与高附加值化学品回收研究进展

Harmless and resourceful utilization of black liquor plays an important role in reducing environmental pollution and alleviating energy shortages. Supercritical water gasification technology is a new and efficient technology for the harmless resource utilization of organic wastewater. It has unique advantages in the harmless and resourceful treatment of papermaking black liquor by utilizing the special properties of water in the supercritical state. The progress of hydrogen production and high value-added chemicals recovery by supercritical water gasification of black liquor in recent years is reviewed. The hydrogen production mechanism is presented and the effects of temperature, pressure, concentration, residence time, and catalyst on hydrogen production by black liquor supercritical water gasification are systematically summarized. The reaction, the separation and recovery mechanism of high economic value salts of black liquor in supercritical water and the development status of supercritical water gasification reaction units for black liquor are introduced. Finally, the prospect of supercritical water gasification of black liquor for hydrogen production and resourceful, harmless treatment to recover useful components is presented.