Controlling a Polyolefin Reaction

摘要

Methods and systems for controlling a polymerization reaction in a non-sticking regime are disclosed. An exemplary method includes measuring parameters for the polymerization reaction including a reactor temperature and a concentration of an induced condensing agent (ICA) in a polymerization reactor. An equivalent partial pressure ((PICA)equiv) of the ICA is calculated. The polymerization reaction is located in a two dimension space defined by a reactor temperature dimension and a ((PICA)equiv) dimension. The location in the two dimensional space is compared to an non-sticking regime, defined as the space between an upper temperature limit (UTL) curve and a lower temperature limit (LTL) curve. The parameters of the polymerization reaction are adjusted to keep the polymerization reaction within the non-sticking regime.

主权项

1. A method of modeling a stickiness temperature for a resin, wherein the resin is made in the presence of at least one catalyst, the method comprising:
measuring a stickiness temperature of a resin at each of a plurality of concentrations of induced condensing agent (ICA) in a testing device; measuring a density, a melt index (MI), and a high load melt index (HLMI) for the resin; calculating a melt flow ratio (MFR) by dividing the HLMI by the MI; calculating an equivalent partial pressure (PICA)equiv) of the ICA by accounting for the partial pressure of isomers that accumulate in a reactor; determining an equation that relates the stickiness temperature to the ((PICA)equiv), based, at least in part, on the density, the MI, and the MFR of the resin.