期刊名称：Majalah Iptek = IPTEK : The Journal for Technology and Science
印刷版ISSN：0853-4098
电子版ISSN：2088-2033
出版年度：2019
卷号：30
期号：2
页码：28-31
DOI：10.12962/j20882033.v30i2.4997
出版社：IPTEK
摘要：The declining world oil and gas reserves along with increasing gas emissions from fossil fuel consumption has
received serious attention as an urgent problem worldwide. The alternative solution to the problem uses emulsified fuel which
is expected to provide better combustion efficiency and will contribute to emission reductions, such as NOx and particulate
matter (PM). The one of most important factor in emulsion fuel is its stability. In this work, the effect of water contents to
stability of diesel-water emulsion fuels has been investigated. The stability of emulsion fuel related to coalescence and
sedimentation formation. The diesel fuel-water emulsification process was carried out in a standard stirred tank consisting of
a cylinder tank (93 mm in diameter) and Rushton disk turbine (40 mm in diameter). Materials used consist of diesel oil
(Pertamina DEX), demineralized water, surfactants (Lecithin, Triton X-100 and Tween 80). The surfactant used is a mixture
of Lecithin - Triton X-100 (76.6%: 23.4%) and Lecithin - Tween 80 (45.5%: 54.5%) at 1% total volume of emulsion. The
impeller set in constant speed at 1900 rpm. To reduce emulsification energy consumption, water is added gradually into the
tank at 2 mL/min of flowrate. Water content varies at 5%, 10%, 20%, and 40% by total volume of emulsion. Physical
properties of emulsion fuel such as viscosity and density at room temperature were investigated periodically. The
characterization of emulsion fuel stability was measured by slope value of absorbance ratio at wavelength 450 nm and 850
nm. Sediment formation was periodically by visual observation as emulsion phase percentage. Emulsion droplet size was
measured by Dynamic Light Scattering (DLS) method. Physical properties of emulsions such as density and viscosity tend to
constant value in order of time. Emulsion fuel with 5% water content has the largest volume of emulsion phase in the rest of
time, 83 % for L-T emulsion fuel and 95% for L-Tx. The lowest slope value shown by 5% emulsion fuel water content, -
8.657×10-5 for 5% L-T emulsion fuel and -2,084 × 10-4
for 5% L-Tx emulsion fuel. Droplet size measurement of emulsion
shown that different amount of added water caused the different droplet size of emulsion.
关键词：emulsion fuel;mixed surfactants;low energy emulsification
