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Three cottonseed oil ether monoesters were synthesized and structurally identified and they are ethylene glycol methyl ether cottonseed oil monoester, di-ethylene glycol methyl ether cottonseed oil monoester and tri-ethylene glycol methyl ether cottonseed oil monoester. Investigation was made on the effect of ether group number on physicochemical properties of the cottonseed oil ether monoesters. The results showed that density, kinematic viscosity, smoke point, and solidifying point increase linearly with their ether group number in certain relationships. Cetane number is enhanced in a multinomial function whereas heat value decreases linearly with ether group number. When the cottonseed oil ether monoesters were respectively added to the 0# diesel fuel at volumetric content level of 10%(v) and 50%(v), certain regularities were obtained of the properties changing with ether group number.

In this paper, a new oxygenate methyl 2-butoxyethyl carbonate was chemically synthesized and structurally identified. The effects of the oxygenate as an additive on diesel fuel properties were investigated. Accompanying the increase in volumetric content of the oxygenate in diesel fuel, kinematic viscosity decreases slightly, smoke point increases substantially, flash point goes up a little, solidifying point declines remarkably linearly and there is no copper corrosion emerging during the experiment. The test results of a single cylinder, DI diesel engine burning diesel fuels containing 15%(v) and 25%(v) of the oxygenate exhibited that under 1600rpm, CO can be reduced by the maximum of 60.0%, smoke can be lessened by 57.1%∼87.3% and 57.1%∼91.2% respectively. At 2000rpm, CO can be reduced respectively by the maximum of 50.0% and 87.5%, smoke can be lessened by 9.1%∼64.1% and 33.3%∼69.6% respectively.