| Title | Optimal Integrated Plant for Production of Biodiesel from Waste |
|---|---|
| ID_Doc | 23500 |
| Authors | Hernández, B; Martín, M |
| Title | Optimal Integrated Plant for Production of Biodiesel from Waste |
| Year | 2017 |
| Published | Acs Sustainable Chemistry & Engineering, 5, 8 |
| Abstract | In this work, we have optimized an integrated facility for the production of fully renewable biodiesel from waste via anaerobic digestion. On the one hand, the biogas produced is dry reformed to obtain syngas and methanol. On the other hand, the digestate remaining is used as a nutrient to grow algae. Algae oil is transesterified using internally produced methanol. The problem is formulated as a large non-linear programming problem (NLP) to compute the optimal operating conditions of the various reactors as well as the biogas composition and the content of nutrients in the digestate. Optimal heat exchanger and water networks are designed afterward. A total of 3110 kt/yr of manure is processed for the production of 90 Mgal/yr of biodiesel and 46.7 kt/yr of methanol. The process uses a fraction of the biogas to provide the energy required at the reformer, but the process still needs 1.5 MJ/gal of fatty acid methyl ester and 1.22 gal of water per gal of biodiesel. The production cost of biodiesel is competitive with previous work, 0.31 (sic)/gal, but the investment is higher due to the need to process the waste into biogas, 193 M(sic). A scaled-down study is also carried out to evaluate the production and investment cost as a function of the farm size. |
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