Synthesis Of Bio-based Hydraulic Oil Used Ionic Liquids

Hydraulic oil is one of the most important petro-chemical products and has been widely used in the industry and civil sectors. Howerver, the traditional mineral oil-based hydraulic oil has great hazard on the environment. Many countries have established laws and regulations to confine the use of the Hydraulic oil which can not meet the requirement of biodegradability in the areas sensitive to environment. In the meantime, the petroleum resource is decreasing.In order to alleviate the energy stress and protect the environment, the development of a new biodegradable Hydraulic oil replacing the mineral oil has important social and economic significance.In addition, compared with mineral Hydraulic oil, synthesized ester Hydraulic oil has mangy excellent properties, i.e. the property of high temperature and low temperature,high biscosity index, heat-oxidation stability, fine lubricant characteristic, low bolatility, excellent thermal stability, radiation-reaistant characteristic, physiological harmlessness and easy biodegradability in the natural environment, therefore, it is widely used in all kinds of aviation, spaceflightm military affairs and civilian.Biodegradable hydraulic oil of TMPOE and the process of synthesis trimethylolpropane oleic acid ester from trimethylolpropane and oleic acid catalyzed by ionic liquid had been investigated in this paper.The results showed the conversion of oleic acid had reached 98.5% on the optimum conditions follow as:the content of ionic liquid catalyst 12.0-15%, n(TMP):n(oleic acid) 1.1:3, reaction temperature 150～160℃, reaction time 4.0～5.0h.Comparing with traditional esterification catalyst such as strongly acidic cation exchange resins and p-toluene sulfonic acid, the process catalyzed by ionic liquid has advantage that high conversion, simple technology, clean.