文献类型：会议论文

英文题名：Modeling and Simulation of Borstar Bimodal Polyethylene Process Based on a Rigorous PC-SAFT Equation of State Model

作者：Chen, Keran[1];Tian, Zhou[2];Luo, Na[2];Liu, Boping[1]

机构：[1]E China Univ Sci & Technol, Minist Educ, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Minist Educ, Key Lab Adv Control & Optimizat Chem Proc, Shanghai 200237, Peoples R China

会议论文集：1st Energy System Modeling and Optimization Conference (ESMOC)

会议日期：DEC 09-11, 2013

会议地点：Durgapur, INDIA

语种：英文

外文关键词：Chemical reactors - Polymerization - Equations of state - Polyethylenes - Fluid catalytic cracking - Phase equilibria - Residence time distribution - Industrial plants - Fluidized beds - Gases

摘要：This work aims to develop a rigorous model for industrial successive supercritical slurry-phase and gas-phase catalytic polymerization reactors of the Borstar bimodal polyethylene process. The model consists of thermodynamic modeling, multisite ZieglerNatta polymerization kinetics, and reactor modeling. The perturbed-chain statistical associating fluid theory equation of state (PC-SAFT EOS) with updated parameters allows an accurate description of the phase equilibria of the supercritical slurry-phase and gas-phase system in a wide range of temperatures and pressures. The model predictions of the process variables (i.e., residence time, molar ratio of H-2/C2H4 and H-2/1-C4H8 of each reactor) and polymer properties (i.e., molecular weight, comonomer content, molecular weight distribution (MWD)) agree well with the industrial plant data under multi-steady-state operation conditions. The model is also capable of simulating the effects on the MWD of bimodal polyethylene resulting from the hydrogen inflow rate in a supercritical slurry-phase loop reactor (SLR) and a gas-phase fluidized bed reactor (FBR), as well as the supercritical solvent propane inflow rate of the SLR.