Proposed is a process for purification of yellow humic acid by heterophase cation-exchange membrane. After electrophoresis, its purity was up to 95% and recovery, 88.47%.
The preparation of polypropylene alloy by 2-stage heterophase catalytic copolymerization of ethylene, propylene and 1-butene on spheric Ziegler-Natta catalyst had been studied.