Mutual dissolvability of dimethyl ether (DME) + castor oil, dimethyl ether (DME) + rap oil

L. Zhang1, X. Zhao1 and Z. Liu1

1State Key Laboratory of Thermal Fluid Science and Engineering of MOE, Xi′an Jiaotong University, P.R. China

Keywords: mutual dissolvability
property: mutual dissolvability
material: dimethyl ether (DME); castor oil; rap oil

Various alternative fuels have been investigated currently for diesel engines to reduce the consumption of diesel fuel, and the production of NOx and particulate emissions. The research has shown that dimethyl ether (DME) provides advanced performance as an alternative fuel used in compression ignition engine[1]. The engine using DME as fuel has less exhaust of NOx, CO, NMHC(non methane hydrocarbon), etc. Research [2] has shown that an engine using DME as its fuel has higher thermal efficiency, achieving much less particulate and sulfur free emissions. Nevertheless, the viscosity of DME is low [3], which gives rise to conceivable engine wear. Adding oil to DME not only increases the viscosity but also improves the combustion properties. But when the temperature, either of the engine’s working condition or of the outside environment, drops right close to the insoluble point of mixed fuel, it will become insoluble, even completely separated. As a result, the engine cannot perform well because of supplying inhomogeneous fuel and then fuel combustion in engine varies out of expectation. The critical soluble temperature of DME+diesel fuel and DMC+ diesel fuel was reported in literature [4]. In this work, the critical soluble temperatures of castor oil and rap oil in DME were measured individually, and the soluble and insoluble range was determined by drawing the critical soluble temperature scatter figure. An experimental apparatus was improved for measuring the dissolvability. The critical mutual dissolution temperatures were determined for binary mixtures of DME + castor oil and DME + rap oil. For DME + castor oil their critical mutual dissolution temperatures ranged from 221.46 K to 256.62 K while the mass fractions of castor oil varied from 2.01 % to 93.03 %; For DME + rap oil, the critical mutual dissolution temperatures were between 224.14 K and 258.51 K while the mass fractions of rap oil varied from 3.09 % to 90.30 %. We thank for the support of National Natural Science Foundation of China (Grant No. 50836004).

  1. D. Gill, H. Ofner, SAE Paper No. 990059, 1999

  2. T. H. Fleish, Diesel Progress & Drives 1995, 61, 42-45

  3. H. Teng, J. C. McCandless, J. B. Schneyer, SAE Paper No. 010154, 2001

  4. X. M. Zhao, M .F. Ren, Z. G. Liu, Fuel. 2005, 84, 2380-2383.

     Official Sponsors

uni Anter_logo Tziolas_logo_ linseis netzsch