Parameter
Spec
Test run result
LPG recovery, %
88 (min)
89.1
LPG quality C 2 , mol%
2.0 (max) 94.0 (min) 4.0 (max) 1.0 (max)
0.0
Ra nate
Extract
C 3 , mol% C 4 , mol% C 5 , mol%
98.2
1.8
nil
Table 1 GT-LPG Max test run results
otherwise burned, which led to a high carbon footprint operation. By using GT-LPG Max technology, this plant was able to accomplish two goals: minimise the off-gas that is routed to the treating system and produce an on-spec propane product. Following completion of the performance test run, the new unit was able to achieve a higher purity product at recovery greater than design (see Table 1 ). Additionally, by removing a value component that otherwise went to flare, this single project led to a decrease in CO 2 emissions of 260,000 kta. Higher octane gasoline with GT-BTX PluS GT-BTX PluS is an extractive distillation process that uses a solvent to alter the relative volatility of components being separated. In a mixture containing aromatics and non-aromatics, the relative volatility of the non-aromatic
Rich solvent
Lean solvent
components is enhanced over the aromatic components in the presence of the solvent. The process consists of only two major columns: an extractive distillation column (EDC) and a solvent recovery column (SRC), as shown in Figure 3 . The solvent recirculates between the two columns to extract the aromatics and sulphur components while rejecting the non- aromatics, including olefins, which form the raffinate. The solvent used in the GT-BTX PluS process is a proprietary blend from Sulzer called Techtiv. Figure 3 Schematic of the GT-BTX PluS extractive distillation and solvent recover columns
Benzene concentrate from reformate
O - gas
Naphtha splitter
LCN
SHU
FCC naphtha
Ra nate
New GT- BTX Plu S
O - gas
Benzene
Stabiliser
H
Extract
BZ column
HDS
HCN
MCN splitter
Treated FCC gasoline
H
Figure 4 Process flow diagram of existing gasoline hydrotreater (grey) that has been retrofitted with GT-BTX PluS (green)
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