TABLE 3.
Yield coefficients (Y) during conversion of MTBE and ETBE
| Route | MTBE or ETBE | Yield coefficient (Y [g g−1])a
|
Equationb | ||
|---|---|---|---|---|---|
| P/O = 1 | P/O = 2 | P/O = 3 | |||
| 1 or 2 | MTBE | 0.500 (0.345) | 0.711 (0.49) | 0.826 (0.569) | 7a |
| ETBE | 0.479 (0.319) | Balanced | Excess | 7b | |
| 4 | MTBE | 0.500 (0.345) | 0.789 (0.544) | Excess | 8a |
| ETBE | 0.450 (0.300) | Balanced | Excess | 8b | |
| 3b | MTBE | 0.717 (0.494) | Balanced | Excess | 9 |
| 3a | MTBE | 0.534 (0.368) | 0.827 (0.570) | Excess | 10 |
a
Carbon conversion efficiencies (CCE; in C-mol/C-mol) are indicated in parentheses. Balanced, no dissimilation of substrate required in addition to assimilation to synthesize biomass; excess, more energy generated during assimilation than required for biomass synthesis. The maximum biomass yield (at balanced or excess cases) was as follows: YMTBE = 0.869 (CCE = 0.6); YETBE = 0.750 (CCE = 0.5).
b
Calculations were based on the equations in Table 1.