Chapter 13 Appendix. Computer Simulation of Extraction

Lab 12. The major purpose of this lab assignment is to have you learn how to simulate LLE. It will be helpful if you become familiar with the information resources available in Aspen Plus. The sources useful for this lab are: help, the Aspen Plus User Guide, and the Unit Operations document. The latter two are available as PDF files when you go to Documents instead of the Aspen User Interface. Find the documents, and read the few pages you need.

We will separate a feed that is 10 mol% carbon tetrachloride (CCl₄) and 90 mol% acetic acid (C₂H₄O₂) using a solvent that is pure triethylamine (C₆H₁₅N). Extractor, feed, and solvent are at 293 K and 1 atm. Data and NRTL parameters are available for this system in the DECHEMA data bank (Sorensen and Arlt, 1980). The DECHEMA parameters for NRTL are in Table 13-A1. Note: diluent = acetic acid, solute = carbon tet.

Table 13-A1. NRTL parameters and experimental tie line data for triethylamine (1), carbon tetrachloride (2), and acetic acid (3) at 293K and 1 atm (Sorensen and Arlt, 1980); alpha = 0.2, units are K

i	j	Aij	Aji
1	2	−303.24	90.396
1	3	1162.9	−143.69
2	3	350.19	75.515
Experimental tie lines in mole frac: Triethylamine phase 2			Acetic acid phase 1
1	2	3	1	2	3
0.914	0.020	0.066	0.412	0.0090	0.579
0.861	0.0710	0.068	0.414	0.034	0.552
0.770	0.144	0.086	0.418	0.071	0.511
0.698	0.192	0.110	0.423	0.104	0.473
0.642	0.216	0.142	0.425	0.135	0.440
0.62	0.222	0.158	0.425	0.147	0.428