Acetone-benzene-chloroform mixture split

The intermediate split A bottom product which is a mixture of benzene and chloroform with a trace of acetone. The ratio of acetone to chloroform... 

Projecting from the chloroform vertex through the top and bottom products to the acetone/benzene edge gives the range covered for the acetone/benzene split by column 1. The binary range is from pure acetone (top) to a mixture of about 11 % acetone in benzene (bottom). 

The last alternative we consider is to start with the intermediate split, where we remove a mixture of benzene, chloroform and a trace of acetone in the bottom product of the first column. (See Fig. 32.) Without a systematic approach, we would very likely miss this alternative. We separate the bottom product from the first column into benzene and chloroform in a second column. The top product from the first column is a mixture of acetone and chloroform. 

Figure 3.14. Examples of determination whether the feed points xp belong to distillation regions Reg and what are the compositions of xd and xb products at direct xd( ) xb(V) and indirect xd(2) xb(2) splits of the mixture of (a) acetone(l)-methanol(2)-chloroform(3)-ethanol(4), the region 12 13 (b) isopropanol(l)-benzene(2)-cyclohexane(3)-n-butanol(4), the region 123 4. The...

Figure 4.17. Reversible section trajectories of acetone (l)-benzene(2)-chloroform(3)-toluene(4) mixture for two-section column (split 1,2,3 2,3,4) region of possible bottom Regg is shaded.

Figure 5.18. The tangential pinch in rectifying section for the acetone(l)-benzene(2)- chloroform(3) mixture for the split 1,3 2 (a) sharp separation (the tangential-pinch region Regj g not shaded), (b) quasisharp separation. 1, 2, 3, different values of L/V and different iso-f 2 lines (thin hues) SN, saddle-node point.

The example of tangential pinch for four-component mixture is quasisharp separation of azeotropic mixture acetone (l)-benzene (2)-chloroform (3)-toluol (4) of composition Xf (0,350 0,250 0,150 0,250) at intermediate split 1,3(2) 2,4(3) (admixture components heavy and light key are in brackets correspondingly) at the following composition the products xd (0,699 0,001 0,300,0) and xb (0 0,500 10 0,500). The same top product composition, as in the previous example (Fig. 5.18b) of separation of three-component mixture in the top section, is accepted for convenience of analysis. In this case, the boundary elements of top section trajectory bundle, located in face 1-2-3, completely coincides with top section trajectory bundle at separation of previously mentioned three-component mixture. 

Figure 7.9. (a) Section trajectories at quasisharp intermediate split for the equimolar acetone(l)-benzene (2)-chloroform(3)-toluene(4) mixture (L/V = 0.778, Xf i = 1 -b 0 products purity - 0.99), sepa-... 

The fifth rule sharp splits with a preliminary recycle for change of feed composition are more preferable than semisharp splits without preliminary recycle. Figure 8.22 shows two possible separation flowsheets of mixture acetone(l)-benzene (2)-chloroform(3) into pure components in the case of the bottom product point... 

---