Researchers from Tatung and National Cheng Kung Universities in China, and Case Western Reserve University in Ohio, report manufacturing a new oxygenate additive for diesels (bio or petroleum) using glycerol (a major byproduct of biodiesel production), dimethyl sulfate (DMS), and sodium hydroxide pellets as raw materials.
A paper on the work is published in the ACS journal Industrial & Engineering Chemistry Research.
By feeding the dimethyl sulfate into the batch reactor containing the sodium glycerate, a semi-batch mode operation enhanced the effective methylation of glycerol. A conventional stirred tank reactor that can produce large quantities of oxygenate additives under a normal atmospheric pressure operation became the main feature of the methylation process.
With a 3:2 molar ratio of DMS to glycerol, a 3:1 molar ratio of sodium hydroxide to glycerol, a 0.43:1 molar ratio of water to sodium hydroxide, and a temperature of 343 K at the reaction time of 24 h with the feeding time of DMS under 12 h, the conversion of glycerol (93.5%) and a combined yield of GDMEs and GTME of 71.2% were achieved for a once-through operation. A product mixture of GDME (20 wt %) and GTME (80 wt %) served as a new oxygenate additive for (bio or petroleum) diesels.—Chang et al.
Jyh-Shyong Chang, Yu-Da Lee, Lawrence Chao-Shan Chou, Tzong-Rong Ling, and Tse-Chuan Chou (2011) Methylation of Glycerol with Dimethyl Sulfate To Produce a New Oxygenate Additive for Diesels. Industrial & Engineering Chemistry Research doi: 10.1021/ie201612t