What is in this article?:
- Tapioca pearls ideal for removing water from ethanol
- 100 percent starch
- Researchers have found an alternative environmentally friendly and energy-efficient way to dry corn ethanol, and their proof is in the pudding. The shape and structure of tapioca pearls are ideal for removing water from ethanol.
100 percent starch
While tapioca pearls are 100 percent starch, corn grits also contain fiber, protein and other substances that are not efficient for absorbing water.
Starch-based adsorbents like tapioca pearls also take up the heat created during drying, allowing that heat to be reused to evaporate water during regeneration of the drying bed.
"This combines fundamental biochemistry, biology and engineering with thermodynamics to obtain an efficient separation system," Ladisch said.
After trying several options to maximize water absorption, including corncobs and wood chips, inspiration struck Ladisch while watching his mother-in-law fix Thanksgiving dinner. As she started mixing up homemade tapioca pudding, Ladisch noticed that the tapioca pearls looked similar to the beads used in molecular sieves.
"I started thinking, 'It's a starch. Might this work?'" Ladisch said.
Ladisch said tapioca pearls may be used effectively in U.S. ethanol facilities, but he believes they could be more significant in facilities in South America and Africa where the plant used to create tapioca - cassava - is grown.
Ladisch and Kim said they would continue to test uses for tapioca pearls, including drying other alcohols. They also plan to create synthetic, starch-based adsorbents from other cheaper materials to lower the cost.
Ladisch is chief technology officer at Mascoma, a renewable fuels company based in New Hampshire. He received no funding from the company for this research. Archer Daniels Midland funded the work.