Unimodal grades

The catalyst is only fed to the first reactor. Polymerization occurs in a dispersing medium like n-hexane using a Ziegler catalyst with very high activity. No deactivation and catalyst removal is necessary because a very low level of catalyst residue remains in the polymer. For unimodal-grade production, the catalyst, dispersing medium, monomer and hydrogen are fed to the first reactor (1) where the first polymerization takes place. The slurry is then sent to the post reac-... 

Fuzzy arithmetic Fuzzy arithmetic is the arithmetic embodied in operations snch as addition, subtraction, multiplication, and division of fnzzy nnmbers. Fnzzy nnmbers are unimodal distribution functions of the real line that grade all real numbers according to the possibility that each might be a valne the fnzzy number could take on. The minimum of the function is 0, which represents impossible values, and the maximum is 1, which represents those... 

The basic module, loop/gas-phase reactor combination, enables high once-through conversion (minimized recycle), since unreacted monomer from loop reactor is consumed in the gas-phase reactor. Polymerization conditions in each reactor can be independently controlled, enabling production of both standard unimodal and broad-molecular-weight multimodal grades. The production rate ratio between the reactors can be adjusted to meet the targeted product properties. 

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