Hydrophobic starch compositions and uses of starch as fuel

C - Chemistry – Metallurgy – 08 – L

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C08L 3/00 (2006.01) C10L 1/10 (2006.01)

Patent

CA 2598658

Fuels and fuel components comprising starch are provided, as well as methods for operating a combustor such as a boiler or an internal combustion engine by feeding a starch fuel to the combustor. The starch may be a common starch or a modified starch, such as a free-flowing, hydrophobic starch having a near- neutral dry product pH. The starch may be provided as a solid fuel such as a powdered fuel or as a fuel slurry. The fuels can include a starch as the primary combustible component and/or may include other fuel components such as gasoline, diesel, kerosene, jet fuel, and alcohols. Methods are also provided for making a free-flowing hydrophobic starch by preparing an aqueous mixture comprising a starch, a siliconate, and an acid, where the aqueous mixture has a near-neutral pH, and drying the starch solids to obtain a hydrophobic starch having a near-neutral dry product pH.

L'invention concerne des combustibles et des composants combustibles comprenant de l'amidon, ainsi que des procédés pour faire fonctionner une chambre de combustion telle qu'une chaudière ou un moteur à combustion interne par alimentation d'un combustible à base d'amidon dans la chambre à combustion. L'amidon peut être un amidon commun ou un amidon modifié, tel qu'un amidon hydrophobe, à écoulement libre, présentant un pH de matières sèches pratiquement neutre. L'amidon peut être utilisé en tant que combustible solide tel qu'un combustible pulvérisé ou en tant que combustible en suspension. Les combustibles peuvent comprendre un amidon en tant que composant combustible primaire et/ou peuvent comprendre d'autres composants combustibles tels que de l'essence, du diesel, du kérosène, du carburéacteur et des alcools. L'invention concerne également des procédés de production d'amidon hydrophobe à écoulement libre par préparation d'un mélange aqueux comprenant un amidon, un siliconate et un acide, le mélange aqueux présentant un pH pratiquement neutre, et par séchage des solides à base d'amidon afin d'obtenir un amidon hydrophobe présentant un pH de matières sèches pratiquement neutre.

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