Hittade en intressant patent
http://www.patentstorm.us/applications/ ... ption.htmlUS Patent Application 20110162260 - Alcohol Fuel Soluble Additive for Removing Deposits in Fueling Systems
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[0004] Specifically, conventional polyisobutylene (PIB) based gasoline detergents can precipitate out of alcohol fuels in a fuel system leading to problems such as fuel filter plugging and the formation of deposits in the fuel induction system. PIB detergents may be introduced into alcohol fuels or alcohol blended fuels at several points along the supply chain. One example of potential introduction is during the blending of alcohol fuels, such as E85, at a terminal. Gasoline containing high doses of PIB detergent could be inadvertently blended with the fuel or be present as a residue in fuel handling equipment leading to contamination. Another example of when gasoline, and the PIB detergents they often contain, may be introduced into alcohol fuels, is during the fueling of a flexible fuel vehicle (FFV). Such vehicles are becoming more common in the market. A consumer with a FFV could have a partial tank of PIB detergent dosed gasoline, which he or she then re-fills with an alcohol fuel such as E85, or vice verse. The result of these and other examples is the same: a significant amount of PIB detergent in an alcohol fuel or alcohol fuel blended with gasoline, which may lead to fuel system problems such as the formation of persistent deposits of a soft, sludge-like, hard or rubbery texture. Alcohol fuels alone are not capable of removing these deposits, creating a need for a means to prevent these deposits and/or remove these deposits from the engine.
SUMMARY OF THE INVENTION
[0005] It has been discovered that alcohol fuels which are additized with an alkoxylate detergent and/or a fatty acid or derivative thereof can remove deposits in fuel systems created by PIB detergents and also change the composition of the deposits, such that the deposits are more easily removed.
[0006] The present invention solves the problems associated with alcohol fuels' tendencies for engine deposits formation and lack of ability to remove such deposits by providing fuel additives for alcohol fuels and fuel compositions that improve the alcohol fuels' ability to remove and prevent such deposits and the problems related to them.
[0007] The present invention provides a fuel composition comprising: (A) a fuel where the fuel is a liquid at room temperature comprising a blend of hydrocarbonaceous and nonhydrocarbonaceous fuel having a nonhydrocarbonaceous fuel content of at least 50 percent by weight; and (B) an additive component comprising: (i) a alkoxylate detergent; (ii) a fatty acid or derivative thereof; or (iii) combination thereof. The additive component must be soluble in the fuel blend. The present invention also includes additive concentrates containing the additive component described herein as well as the additive component itself. In some embodiments the additive compositions, additive concentrate compositions and/or fuel compositions of the present invention further comprise and antioxidant.
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The Fatty Acids or Derivates Thereof
[0043] In one embodiment the additive component of the present invention may comprise a fatty acid or derivative thereof. Derivatives of the fatty acid useful in present invention include partial and full esters of such acids as well as fatty acid amides and imides. In particular, suitable derivates include glycerol monoesters including those derived from oleic acid, such as glycerol monooleate. The fatty acids or derivatives thereof of the present invention can have 4 to 30 carbon atoms, or 8 to 26 carbon atoms, or 12 to 22 carbon atoms. Saturated and unsaturated monocarboxylic acids are useful and include capric, lauric, myristic, palmitic, stearic, behenic, oleic, petroselinic, elaidic, palmitoleic, linoleic, linolenic and erucic acid. Typical fatty acids are those derived from natural oil typically containing C6 or C22 fatty acid esters, i.e., glycerol fatty acid esters or triglycerides derived from natural sources, for use herein include, but are not limited to beef tallow oil, lard oil, palm oil, castor oil, cottonseed oil, corn oil, peanut oil, soybean oil, sunflower oil, olive oil, whale oil, coconut oil, palm oil, rape oil, and soya oil.
Kanske en liten skvätt rapsolja eller RME i E85 kan förhindra polyisobutylen att fastna och kleta ihopp till rosa kladdet? Enligt wikipedia innehåller rapsolja 99g fettsyror per 100g:
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Innehåll Mängd per 100 gram
Mättade fettsyror 6 gram
Enkelomättade fettsyror 62 gram
Fleromättade fettsyror 31 gram
Andra fetter 1 gram