Triethylene glycol solutions

A few other dehydration systems are also widely used which employ glycol injection and contact with the gas. Mono-, or di-, or triethylene glycol solution is used for this purpose. The principles are very similar to the methanol dehydration system. The disadvantages associated with the glycol methods are inadequate distribution in the gas-gas exchangers, difficulty to remove from the dehydrated gas, foaming, and mutual solubility between the hydrocarbon liquids and the glycol solution. 

Two processes at 310°K. (102 c.p.s.) and 350°K. (102 c.p.s.) have been found (68), using the dielectric technique, for atactic poly (vinyl alcohol) crystals, grown from 0.05% triethylene glycol solution while cooling from 180° to 165°C. These maxima have been previously attributed (77) to local mode and glass transformation motion, respectively. 

Table 7.123 Water Vapor Dew Points Over Aqueous Triethylene Glycol Solutions (23)...

Figures 11-14 and 11-15, which are based on the work of Polderman (1957) and Parrish et al. (1986), present data on the water dew points of gases in equilibrium with diethylene and triethylene glycol solutions at various temperatures. The TEG curves are based on the Parrish et al. data rather than the widely used Worley (1967) data because the Parrish et al. data cover a wider range of dew-point depressions and TEG concentrations are thermodynamically consistent and generally result in more conservative designs.

Figure 11-19. Total vapor pressure of various triethylene glycol solutions vs. temperature. Dow Chemical Company Data (1956)...

Figure 11-20. Specific gravity of diethylene and triethylene glycol solutions at 60°F, and effect of temperature on specific gravity of the pure glycols. Oafe of Utifen Cadxde Carp. (1971)...

Figure 11-24. Freezing points of ethylene, diethylene, and triethylene glycol solutions. Data of Union Carbide Corp. (1971)...

Table 11-4 Equations for Estimating Properties of Triethylene Glycol Solutions ...

Figure 5.2C Densities of aqueous triethylene glycol solutions. (Courtesy of John M. Campbell.)...

---