Diffusion Coefficients: ethylene_oxide
Binary diffusion coefficients for gas-gas, gas-liquid (dissolved gas in water), and liquid-liquid (solute in water) systems — gas-gas D in cm²/s at 1 atm; gas-liquid D in cm²/s (×10⁻⁵ range); liquid-liquid D in m²/s (×10⁻⁹ range); all at or near 25°C reference; per Marrero & Mason, Cussler, Perry's, CRC Handbook
| species A | species B phase T | D cm2 per s (cm2/s) | estimation method | notes | phase | pressure atm (atm) | species B | temperature C (C) |
|---|---|---|---|---|---|---|---|---|
| ethylene_oxide | air#gas-gas#25C | 0.104 | Chapman-Enskog | Ethylene oxide (C2H4O) in air at 25°C, 1 atm. Chapman-Enskog calculation using EO LJ parameters sigma=4.33 A, eps/k=440 K (Reid et al. 5th Ed. Appendix B); confirmed in Perry's 8th Ed. Table 5-18. Key value for EO sterilization dispersion and safety calculations. | gas-gas | 1 | air | 25 |
| ethylene_oxide | water#gas-liquid#20C | 0.000013 | Wilke-Chang | Ethylene oxide dissolved in water at 20°C. Scaled from 25°C value (1.60e-5 cm2/s) using Stokes-Einstein temperature correction D~T/mu: D(20)=1.60e-5*(293.15/298.15)*(0.890/1.002)=1.32e-5 cm2/s. mu_water(20C)=1.002 cP, mu_water(25C)=0.890 cP. | gas-liquid | 1 | water | 20 |
| ethylene_oxide | water#gas-liquid#25C | 0.000016 | Wilke-Chang | Ethylene oxide dissolved in water at 25°C. Wilke-Chang estimate: phi_water=2.26, M_water=18.015, mu=0.890 cP, V_A(LeBas)=51.4 cm3/mol -> D ~1.60e-5 cm2/s. Consistent with propylene oxide (1.58e-5) and acetaldehyde (1.65e-5) from Cussler (2009) Table 5.1-1. Used in EO absorption tower and sterilizer off-gas scrubber design. | gas-liquid | 1 | water | 25 |
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