Application of Peng-Rabinson equation of state for CO 2 freezing prediction of hydrocarbon mixtures at cryogenic conditions of gas plants
Abstract
Carbon dioxide freezing problem is studied at cryogenic condition of NGL production gas plants. The Peng-Rabinson equation of state is used for predicting the CO 2 freezing points of hydrocarbon liquid and vapor mixtures. A quadratic temperature dependent correlation is presented for the proper description of a binary interaction parameter of methane and carbon dioxide at low temperatures. The overall average absolute relative deviation between the experimental and predicted CO 2 freezing temperatures for this binary system is 0.26%. The proposed model is then used for equilibrium calculations of a gas plant demethanizer column, and the CO 2 freezing points of the vapor and liquid hydrocarbon mixtures at the cold top trays of the demethanizer are predicted.
- Publication:
-
Cryogenics
- Pub Date:
- December 2006
- DOI:
- 10.1016/j.cryogenics.2006.07.010
- Bibcode:
- 2006Cryo...46..840Z