Corrosion inhibitor/metal passivator additive composition from waste refinery streams
AssigneeIndian Oil Corporation Limited
InventorsPankaj Kumar Mondal, Khem Chand Dohhen, Rakesh Sarin, Deepak Kumar Tuli, Ram Prakash Verma, Akhilesh Kumar Bhatnagar
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Abstract
The reaction of the disulphided oil, as obtained from the caustic wash of liquefied petroleum gas, with 2,3,8,9,13,14-hexathia-5,6,11,12 -tetraazatricyclo [8.2.1.14,7]tetradeca-4,6,10,12-tetraene was carried out in one pot and one step to yield a corrosion inhibiting composition comprising predominantly of 2,5-bis(methyldithio)-1,3,4-thiadiazole, 2-methylthio-5-ethylthio-1,3,4-thiadiazole and 2,5-bis(ethyldithio)-1,3,4-thiadiazole, for application in fuels, lubes and greases. (I)
Claims12
A corrosion inhibiting additive composition for lubricant, grease and fuel applications, comprising of
- a) 2,5-bis (methyldithio)-1,3,4-thiadiazole:
- 35-65% by weight;
- b) 2-methyldithio-5-ethlyldithio-1,3,4-thiadiazole:
- 35-65% by weight and the balance of 2,5-bis (ethyldithio)-1,3,4-thiadiazole in order to make up to 100% by weight.
A process for preparing a corrosion inhibiting additive composition, by reacting 2,3,8,9,13,14-hexathia-5,6,11,12- tetraazatricyclo [8.2.1.14,7]tetradeca-4,6,10,12-tetraene, in a polar organic solvent, with disulphide oil obtained from Merox extraction/caustic wash of liquid petroleum gas.
Dependencies are inferred from the claim text.