Experiments and simulations are used to investigate the thermodynamic characteristics of process Volatile Organic Compounds (VOCs) in asphalt (solute). Thermodynamic characteristics (partitioning coefficients, Kr, and activity coefficients, Y, enthalpy of solution, ) of five different solvents (0, 2.56, 9.93, 36.86, and 53.67) were investigated. The linear connection between absolute temperature T (333.2 K, 343.2 K, 353.2 K, 363.2 K, 373.2 K, 383.2 K, 393.2 K) and several solvents (nC5, iC5, nC6, nC7, toluene) was thoroughly studied. One of the basis of the modelling process is the thermodynamic behaviour of salute and solvents, which can be described in terms of the change in the molecular size ratio between solvents and solutes and their interactions The partitioning and activity coefficients found are useful in thermodynamic modelling and the solvent recovery business. The activity coefficient reduces as the amount of asphaltene (solute) grows and increases as the length of the solute alkane chain decreases (carbon number). For example, in bitumen with 18 wt% asphaltene(solute), the partitioning coefficient is substantially greater than in bitumen with 84 wt% asphaltene (solute).

Author(S) Details

Jing Yuan
Department of Civil Engineering, Tongling University, Tongling, 244000, China and University of Alberta, Edmonton T6G 1H9, Canada.

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