Page 9 - LSR on Servocyclotherm G

Introduction of Servocyclotherm G at Digboi Refinery – An Import Substitution

The above picture shows the blends prepared by mixing Servocyclotherm G with diluted Dowcal
100 in water as received from Digboi Refinery.

Table 2 : Homogeneity and Miscibility Study of Dowcal 100 (diluted, under use) and
Servocyclotherm G (fresh)
S.N. Properties Mixing ratio of Dowcal 100 (used and diluted with water
≈80% as received from DR) and Servocyclotherm G (fresh)
90:10 80:20 70:30 50:50
1 Initial sample No No No No
Separation Separation Separation Separation
2 Observation at 30 °C No No No No
after cooling upto -10 Separation Separation Separation Separation
°C and warming
3 After a cycle of heating No No No No
to 150 °C cooling to 0 Separation Separation Separation Separation
°C, storing for 8 hrs. at
this temperature
4 Warmed to room No No No No
temperature@30 °C Separation Separation Separation Separation

Table 3 : Compatibility study of Dowcal 100 (fresh) and Servocyclotherm G (fresh)
S.N. Properties Mixing ratio of Dowcal 100 and Servocyclotherm G
90:10 80:20 70:30 50:50
1 K Viscosity @ 40 °C, cSt 11.00 11.42 11.21 11.90
2 K Viscosity @ 10 °C, cSt 41.33 43.87 43.81 44.27
3 K Viscosity @ 0 °C, cSt 74.09 76.14 78.58 82.74
4 K Viscosity @-10 °C, cSt 143.09 145.18 145.33 156.81
5 TAN, mg KOH/g 1.83 1.54 0.73 0.95
6 Refractive Index 1.43632 1.43675 1.43700 1.43750
7 pH 8.12 8.15 8.21 8.22
8 Reserve alkalinity 12.2 12.1 11.9 11.6
9 ERBP 160 164 162 161

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