CD Tugas Akhir
Analisis Pengaruh Temperature Difference (Δt) Terhadap White Liquor Quality Pada Departemen Recaust Kiln Effluent (Rke), Pt Riau Andalan Pulp And Paper
ABSTRACT
Recausticizing is part of the kraft chemical recovery process which aims to regenerate white liquor by reacting green liquor with lime (CaO) originating from the lime kiln process. The green liquor reacts with the lime in slaker, where the reaction that occurs is exothermic. This reaction causes an increased temperature in slaker. The temperature difference between the green liquor inlet slaker and the temperature inside the slaker is called the temperature difference (ΔT). The purpose of this study was to determine the effect of ΔT on white liquor quality, as well as active CaO and lime consumption. White liquor quality parameters include total titratable alkali (TTA), sulfidity, total active alkali (TAA), and causticizing efficiency (CE). The data used in this report is secondary data obtained from the Recaust Kiln Effluent (RKE) Department, which is then processed into a correlation chart. The results of the analysis show that ΔT has a weak relationship with TTA and sulfidity in white liquor, indicated by the low R2 values obtained, i.e. 0.3329 and 0.3033 respectively. This means that the size of the TTA and sulfidity values are not affected by ΔT. Meanwhile CE, TAA, active CaO, and lime consumption have a strong relationship with ΔT, indicated by the resulting R2 values being above > 0.8, each of which is 0.8311; 0.8218; 0.8425; and 0.8351. This means that the values of CE, TAA, active CaO, and lime consumption are affected by ΔT, where the four variables have a relationship that is directly proportional to ΔT. The resulting white liquor meets the target quality parameters in the ΔT value range of 18 – 19.5ºC.
Keywords: exothermic, green liquor, recausticizing, temperature difference, white liquor
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