Process for increasing the storage stability of biodiesel and the use of 2,4-di-tert-butylhydroxytoluene for increasing the storage stability of biodiesel

Abstract

A process is described for increasing the storage stability of biodiesel by metering a liquid stock solution which comprises 15 to 60% by weight of 2,6-di-tert-butylhydroxytoluene dissolved in biodiesel into the biodiesel to be stabilized up to a concentration of 0.005 to 2% by weight of 2,6-di-tert-butylhydroxytoluene, based on the overall solution of biodiesel.

1 . Process for increasing the storage stability of biodiesel, comprising metering a liquid stock solution which, based on the stock solution, comprises 15 to 60% by weight of 2,6-di-tert-butyl-hydroxytoluene dissolved in biodiesel into the biodiesel to be stabilized, up to a concentration of 0.005 to 2% by weight of 2,6-di-tert-butyl-hydroxytoluene, based on the overall solution of biodiesel. 
   
   
       2 . Process according to  claim 1 , characterized in that the stock solution is metered into the biodiesel up to a concentration of 0.1 to 1% by weight of 2,6-di-tert-butyl-hydroxytoluene, based on the overall solution of biodiesel. 
   
   
       3 . Process according to  claim 1 , characterized in that the biodiesel is a biodiesel which has been obtained by transesterification with methanol from rapeseed oil, soya oil, palm oil, used cooking oil or animal fat. 
   
   
       4 . Liquid stock solution for use in a process for increasing the storage stability of biodiesel, comprising, based on the overall stock solution, 15 to 60% by weight of 2,6-di-tert-butyl-hydroxytoluene dissolved in biodiesel. 
   
   
       5 . Storage-stabilized biodiesel, comprising 0.005 to 2% by weight of dissolved 2,6-di-tert-butyl-hydroxytoluene.