Council of Scientific and Industrial Research

Venkata Surya Koppeswara Rao Bhamidipati

Badari Narayana Prasad Rachapudi

Satya Bhaskar Potula

Venkata Padmaja Korlipara

Saravanan Krishnasamy

Arun Kumar Singh

Karunakar Reddy Rondla

Castor oil was hydrolysed to castor fatty acids and self condensed to get a ricinoleic acid-based estolide of about 95 acid value. The carboxylic group of the estolide on subsequent esterification with linear or branched chain alcohols and also on acetylation of free hydroxy group yielded castor oil fatty acids based estolide esters and their acetates. All the products were evaluated for total acid number (TAN), viscosity, viscosity index, pour point, flash point, and copper strip corrosion and found to be potential lubricant basestocks.

Castor oil fatty acid based estolide esters and their derivatives as potential lubricant base stocks

A new class of oleochemical based polyol esters of general formula 1 are prepared by esterification of different polyols having 5-6 carbon atoms and 2-4 hydroxyl groups with 10-undecenoic acid or/and undecanoic acid with a hydroxyl value of &#x2266;1.0 mg KOH/g. Wherein R, R, Ris selected from a group consisting of CH&#x2014;, CHCH&#x2014;, &#x2014;CHOCORwherein Ris selected from CH&#x2550;CH&#x2014;(CH)&#x2014; or CH&#x2014;(CH)&#x2014;, individually or in combination thereof. The resulting esters were characterized for lubricant properties like viscosity, viscosity index, pour point, flash point and copper corrosion tests. The properties indicate their potential as promising lubricant base stocks for automotive lubricants, metal working oil, hydraulic oil and other industrial applications. Vegetable oils provide most of the desirable lubricant properties such as good boundary lubrication, high viscosity index, high flash point and low volatility. Synthetic esters prepared from renewable resources like vegetable oils exhibit better performance at a lower cost compared to mineral oil based synthetic esters. 

Polyol esters of medium chain fatty acids and process for preparation thereof

The present invention relates to modification of the chemical structure of ricinoleic acid, which is present to an extent of 85-90% in castor oil into triacyloxy alkyl ester derivatives. Accordingly, 9,10,12-trihydroxy octadecanoic acid rich fatty acid mixture was prepared from castor oil and converted to their alkyl esters followed by acylation of hydroxy groups to get 9,10,12-triacyloxy octadecanoic acid alkyl ester rich fatty acid alkyl esters mixture. The 9,10,12-triacyloxy octadecanoic acid alkyl esters were purified from the crude product and characterized byH NMR studies. The crude products were also evaluated for acid value (A.V.), hydroxyl value (H. V.), iodine value (I. V.), viscosity, viscosity index (V.I.), pour point, flash point and copper strip corrosion and found to be potential base stocks for hydraulic, metal working fluids and other industrial fluids.

9,10,12-triacyloxy octadecanoic acid alkyl ester and 9,10,12-triacyloxy octadecanoic acid alkyl ester rich fatty acid alkyl esters mixture and a process for preparation thereof

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Hyderabad Telangana, India

Venkata Surya Koppeswara Rao Bhamidipati