Design of Batch Distillation Columns Using Short-Cut Method at Constant Reflux

Table 3

Equilibrium constant and relative volatilities for the mixture: benzene, toluene, ethylbenzene, and o-xylene at atmospheric pressure.

	Binary data		Peng R. 83–125°C			NRTL 83–125°C			Raoult			Raoult
									Top 80°C			Bottom 110°C
	Ki	𝛼i	Ki	𝛼i	𝛼 ij	Ki	𝛼i	𝛼 ij	Ki	𝛼i	𝛼 ij	Ki	𝛼i	𝛼 ij
Benzene	1.51		2.07		5.91	2.08		6.30	1.00		8.00	2.28		6.33
		1.34		2.35			2.19			2.63			2.38
Toluene	1.13		0.88		2.51	0.90		2.73	0.38		3.04	0.96		2.66
		1.19		1.95			1.99			2.30			2.09
ETB	0.95		0.45		1.29	0.41		1.24	0.17		1.32	0.46		1.28
		1.04		1.29			1.26			1.32			1.28
O-Xileno	0.91		0.35		1.00	0.33		1.00	0.13		1.00	0.36		1.00