Abstract: Bimodal polypropylene products have the characteristics of wide molecular weight distribution and good processability. In order to meet the market demand for new products, hydrogen recovery unit was developed during the design of a polypropylene plant. PRO II software was used to optimize the process of the hydrogen recovery unit. Process parameters were adjusted step by step by analyzing and comparing the equipment specification and energy consumption of different schemes. Finally an optimal process with low investment, low energy consumption and short process flow was developed, which enables the plant to produce bimodal products with ultra-wide molecular weight distribution

Key words: bimodal polypropylene product, hydrogen recovery unit, process development and optimization