Acetone-trichloroethane-water system

Illustration 7. Two solutions, feed F at the rate of 100 Ib./hr. containing 60% acetone, 50% water, and feed F at the rate of 100 Ib./hr. containing 25% acetone, 75% water, are to be extracted in a countercurrent system with 50 Ib./hr. of 1,1,2-trichloroethane at 26 C. to give a raffinate containing 10% acetone. Calculate the number of stages and the stage into which the feed F should be introduced. 

Treybal, R.E., Weber, L.D., Daley, J.F. (1946) The system, acetone-water-1,1,2-trichloroethane. Ternary liquid and binary vapor equilibria. Ind. Eng. Chem. 38, 817-821. 

Solubility in the solvent selected for application Currently the organic solvent are replaced with water as a suspension system, although certain types of film coatings may require organic solvents to be used. Commonly used solvents include alcohols (methanol, ethanol, and isopropanol), esters (ethyl acetate and ethyl lactate), ketones (acetone), and chlorinated hydrocarbons (dichlo-romethane and trichloroethane). 

In a later work of similar nature, Chatterjee etal. [170] prepared a boehmite sol from an aluminum salt. Boehmite particles were precipitated from an aluminum nitrate solution heated to 80 -90 C by addition of an ammonia solution into it. The precipitate was washed and peptized with glacial acetic acid to obtain a colloidal sol. The W/O emulsion was prepared by addition and dispersion of the sol (as the water phase) to an organic liquid, 1,1,1 trichloroethane (TCE) or n-heptane (the oil phase) containing 2-2.5 vol % of Span 80, a non-ionic surfactant. The volume ratio of water phase oil phase was about 1 4, and a suitable sol viscosity range was -10-20 mPa.s. The sol droplets were converted to gel droplets by addition of triethylamine (TEA), a base. The addition of TEA was monitored so that the pH of the system reached a value of 8-9 for completion of ion extraction for this purpose, the volume ratio of the sol to the base was adjusted at 1 0.4. The gel microspheres were washed with acetone and methanol, dried at 100°C and calcined up to 1200"C/1 h, when a-Al203 crystallized from transient alumina phases. The pathway, in brief, was boehmite —> y 5 —> 0 —> a-Al203. Under tailored conditions, it was possible to obtain hollow microspheres (Fig. 4.2). 

Fig. 6.17. Differential extraction in the system acetone-water-trichloroethane. [EquilihrUi from Jnd, Eng. Chem. 88, 817 (1946).]...

Illustration sy Onc hundred pounds of a 50% acetone (C)-50% water (A) solution is to be reduced to a 10% solution of acetone by extraction with 1,1,2-trichloroethane (B) in a cocurrent multiple-contact extraction system. Twenty-five pounds of solvent is to be used in each stage. Calculate the number of stages and concentration of extracts. The temperature is to be 25°C. 

Figure 13-12. Ternary diagram for the system acetone-water -1, 1,2, trichloroethane. (Reproduced with permission from reference 9. Copyright 1946, American Chemical Society.)...

A solution (50 percent acetone 50 percent water) of 45.46 kg is to be taken to a 10 percent acetone level by extraction with 1,1,2-trichloroethane in concurrent multiple contact system. Each stage uses 11.36 kg of solvent. Find the number of stages and concentrations of extracts (see Figure 13-12 for equilibrium data). 

A countercurrent multiple contacting system is used to reduce a 50 percent acetone and 50 percent water to a 10 percent acetone level. The solvent (1,1,2-trichloroethane) rate is 3.79 x 10 kg/sec. Feed rate is 0.0126 kg/sec. Find concentrations and stages needed (see Figure 13-12). 

Two solutions of acetone-water are to be extracted in a countercurrent system. One is a 50-50 mix and the other a 25 percent acetone-75 percent water solution. The solvent (1,1,2-trichloroethane) is fed at 6.31 x 10" kg/sec, while the two feeds each enter at 0.0126 kg/sec. Raffinate product is to be 10 percent acetone. Find the number of stages and the point where the 25-75 feed should be introduced. Figure 13-12 gives equilibrium data. 

A continuous countercurrent system reduces a 0.0278 kg/sec solution (40 percent acetone, 60 percent water) to 10 percent acetone. The solvent is 1,1,2-trichloroethane. Find minimum solvent rate and stages at 1.6 times minimum (solvent rate)/(feed rate). Equilibrium data is given in... 

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