CD Skripsi
Pengaruh Variasi Suhu Di Slaker I - V Terhadap Variasi Total Active Alkali White Liquor Di Unit Recausticing Plant Pt.Rapp
ABSTRACT
The Kraft pulping process has become the most widely used pulping process in
the papermaking industry since its discovery in 1879.This process has three main
advantages over other pulping processes, namely the resulting fiber is stronger,
can be applied to all wood species. Both softwood and hardwood, and lower
operating costs due to the chemical can be reprocessed at a high efficiency of
around 97%. One of the units in chemical reprocessing is a plant that aims to
produce white liquid (WL) from green liquid (GL) which is then used as a medium
for cooking chips in the Digester. This study aims to study temperature variations
in the I-V slaker unit at PT. RAPP on the total active alkali (TAA) variation of WL
in WL tanks. The temperature of each slaker was correlated with TAA WL using a
linear regression approach and was re-tested by comparing the causticizing
efficiency in each slaker. To get the optimal operational process in each slaker for
the variation of TTA GL and temperature in the slaker, the multiple regression
method approach was used. The TAA WL prediction results from multiple
regression between TTA and temperature in the slaker were then compared with
the TAA WL obtained in the laboratory and it was found that the two values were
very close. So this method can be used to determine the optimal operation for
variations in TTA GL and temperature in the slaker. If the variation of TAA WL is
very small, the proportion of alkaline charge used in the digester can be so that
the operational costs can be drawn.
Keywords: Kraft Pulp, Slaker, Causticizing Efficiency, Green Liquor, Total active
alkali, White Liquor.
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