Patent ID: 8034751
Filing Date: 2011-10-11
Classification: C10M,C10N

Abstract:
1. A process for the preparation of composition of a hydraulic fluid, which comprises: (a) fractionating heavy alkylate fractions of linear alkyl benzene (LAB) or crackers, at a temperature in the range of 300-400° C., under vacuum distillation to obtain desired fractions of alkyl benzene having carbon atom C18 to C22 and viscosity in the range of 20-30 cst at about 40° C., (b) removing the oxidized product from the above alkyl fractions by known methods to obtain a base stock, and (c) mixing 98-99.8 wt % of the above said base stock, at least one anti-oxidant in the range of 0.005-0.05 W %, at least one extreme pressure additive in the range of 0.005-0.05 W %, at least one detergent-dispersant in the range of 0.05-0.15 W %, at least one anti-foaming agent in the range of 0.01 to 1.0 W %, at least one pour point depressant in the range of 0.01 to 1.0 W %, at least one corrosion inhibitor in the range of 0.10-0.03 W %, and at least one lubricity additive in the range of 0.005-0.05 W %, under stirring, at a temperature in the range of 50-90° C. to obtain the desired hydraulic fluid composition.