Pulping of bamboo using supercritical ammonia with recovery and reuse of the ammonia

Preliminary research on supercritical ammonia pulping of bamboo was completed using a differential thermal analyzer, scanning electron microscope, X-ray diffractometer, and an energy spectrometer. The results showed that ammonia can be recovered from bamboo raw materials under the supercritical condition of 185 to 190 °C. Compared with conventional kraft bamboo pulp, the separated bamboo pulp met the pulp quality requirements of industrial paper, achieving high efficiency and a multi-level utilization of biomass resources. Ammonia in the system can be recycled.