C H P uniaue solvent
Here's a reaction solvent with a difference—and it's a difference that can save you money by saving energy and processing steps. Below 50°C, CHP™ N-cyclohexyl2-pyrrolidone is miscible in water at all concentrations. At higher temperatures, the miscibility is a function of concentration. For instance, a 25% concentration of CHP sol vent in water is not miscible at temperatures above 50°C; a 10% concentration is not miscible at temperatures above 60°C. (See Figure 1.) Figure 2 shows the effect of adding 2 % NaCI to the mixture: it Two-Phase increases the range of temperatures and concentrations where CHP solvent is immiscible with water. This means you can On«-Phase create a 2-phase system— 25 CHP or an "insolubility zone"— simply by adjusting the 1
Figure 1. The effect of temperature on solubility of CHP in water.
FRÏ
temperature or adding salts. A n d that's an energy saver, because it lets you separate water from a system without distillation. Moreover C H P N-cyclohexyl-2pyrrolidone is a n excellent solvent for a wide range of hydrocarbons, polar c o m p o u n d s a n d polymers. A n d its high boiling point (284°C at 760 mm) gives it a distinct advantage over such conventional solvents as DMF; DMAC, DMSO, THF; acetonitrile a n d sulfolane. Information a n d free samples. C H P solvent is available in commercial quantities for immediate delivery. Call (212) 621-5900 or write to G A F Corporation, Commercial Development Department, 140 West 51 st Street, New York, N.Y 10020.
Two-Phase
CHP°
30
% by weight°°
90
Figure 2. The effect of temperature on solubility of CHP in 2.0% NaCI solution.
Commercial Development ™
© (6) 1981 19R1 GAF RAF Corporation Corporation
