Impurities in Methyl-t-Butyl Ether (MTBE) on Rtx®-DHA-100 (ASTM D5441)

Peaks
1.Methanol
2.iso-Pentane
3.n-Pentane
4.trans-2-Pentene
5.tert-Butanol
6.cis-2-Pentene
Peaks
7.2-Methyl-2-butene
8.tert-Butyl ethyl ether
9.tert-Amyl methyl ether (TAME)
10.2,4,4-Trimethyl-1-pentene
11.4,4'-Dimethyl-2-neopentyl-1-pentene (triisobutylene)
12.2,2,4,6,6-Pentamethyl-3-heptene (triisobutylene)
image
GC_PC1268
ColumnRtx®-DHA-100, 100 m, 0.25 mm ID, 0.50 µm (cat.# 10148)
SampleASTM D5441 MTBE contaminants mix
Conc.:1 % (w/w) each component in MTBE
Injection
Inj. Vol.:0.2 µL split (split ratio 200:1)
Liner:Cup splitter (cat.# 20710)
Inj. Temp.:200 °C
Oven
Oven Temp.:50 °C (hold 13 min) to 180 °C at 10 °C/min (hold 7 min)
Carrier GasHe, constant pressure (39.3 psi, 271.0 kPa)
Linear Velocity:23 cm/sec @ 50 °C
DetectorFID @ 250 °C
Make-up Gas Flow Rate:24 mL/min
Make-up Gas Type:N2
Hydrogen flow:30 mL/min
Air flow:358 mL/min
InstrumentAgilent 7890A GC
NotesResolution between trans-2-pentene/tert-butanol and tert-butanol/cis-2-pentene exceeds the ASTM Method D5441 requirement of R ≥ 1.3.
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