Efficient filtration system for paraffin-catalyst slurry separation
2013
The filtration efficiency for separating liquid paraffin (or water) from a
slurry consisting of 25 weight% spherical alumina in a Slurry Bubble Column
Reactor (SBCR) comprised of a cylindrical tube of 10 cm diameter and 150 cm
length was studied. Various differential pressures (ΔP) were applied to two
separate tubular sintered metal stainless steel filter elements with nominal
pore size of 4 and 16μm. The experimental results disclosed that the rate of
filtrations increased on applying higher differential pressure to the filter
element. Albeit this phenomenon is limited to moderate ΔPs and for ΔP more
than 1 bar is neither harmful nor helpful. The highest filtration rates at
ΔPs higher than 1 bar were 170 and 248 ml/minute for 4 and 16μm respectively.
Using water as the liquid in slurry the rate of filtration enhanced to 4
folds, and this issue reveals impact of viscosity on filtration efficiency
clearly. In all situations, the total amount of particles present in the
filtrate part never exceeded a few parts per million (ppm). The statistical
analysis of the SEM image of the filtrate indicated that by applying higher
pressure difference to the filter element the frequency percent of larger
particle size increases. The operation of filter cake removing was performed
with back flashing of 300 ml of clean liquid with pressures of 3-5 bar of N2
gas.
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