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Excellent Separation of Neopentane and C4 Hydrocarbons

Featured Application: Neopentane Analysis on Rt-Alumina BOND/MAPD Column

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  • Highly selective stationary phase ideally suited for the analysis of C1-C5 hydrocarbons.
  • Accurately resolves all compounds in a fast, 24-minute run time.
  • Achieve a faster, 21-minute run time with good separation when using hydrogen carrier gas.

Neopentane, or 2,2-dimethyl propane (C5H12), is an impurity in C4 hydrocarbons streams, such as 1,3-butadiene, n-butane, and butylene. It is used in a variety of applications from the production of adhesives, paints, and inks to the blowing agent in the production of polystyrene foam. While neopentane analysis is performed more frequently than in the past, chemists often have difficulty separating neopentane from other hydrocarbons due to column limitations.

The unique stationary phase of Rt-Alumina BOND/MAPD columns is highly selective for C1-C5 hydrocarbons, offering excellent separation of neopentane and other impurities. Their high capacity and loadability provide exceptionally symmetrical peaks, making these columns ideal for impurity analyses at ppm concentrations. Rt-Alumina BOND/MAPD columns are manufactured using an innovative bonding process that reduces particle generation and release, resulting in robust and reproducible retention and flow.

Separation of Neopentane from Other C4 Hydrocarbons on the Rt-Alumina/MAPD

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GC_PC1384
PeakstR (min)Conc. (mol. %)
1.Methane2.4225.02
2.Ethane3.4334.027
3.Ethylene4.8661.989
4.Propane5.996.03
5.Cyclopropane8.8980.03
6.Propene9.6573.026
7.Isobutane10.4935.028
8.Butane11.0444.028
9.Allene11.3340.983
10.Acetylene11.3341.013
11.2-Butene, (E)-15.0713.016
PeakstR (min)Conc. (mol. %)
12.1-Butene15.4522.015
13.Neopentane15.9760.013
14.1-Propene, 2-methyl-16.1181.003
15.2-Butene, (Z)-16.452.028
16.Butane, 2-methyl-17.0050.996
17.Pentane17.5762.013
18.1,3-Butadiene18.8923.016
19.2-Pentene, (E)-20.7870.201
20.2-Butene, 2-methyl-21.2740.211
21.1-Pentene21.5930.403
22.2-Pentene, (Z)-22.1070.402
23.Hexane24.0250.401
ColumnRt-Alumina/MAPD, 50 m, 0.53 mm ID, 10 µm (cat.# 19778)
Standard/SampleRefinery gas #4 (DCG Partnership, LTD)
Diluent:Helium
Conc.: 250 μL injected via gastight syringe (cat.# 24572)
Injection
Inj. Vol.:250 µL split (split ratio 10:1)
Liner:4.0 mm ID Topaz Precision liner w/ wool (cat.# 23305)
Inj. Temp.:280 °C
Split Vent Flow Rate:61.92 mL/min
Gas Saver Time:2 min
Gas Saver Flow Rate:20 mL/min
Oven
Oven Temp.:30 °C (hold 1 min) to 80 °C at 30 °C/min (hold 2 min) to 170 °C at 6 °C/min (hold 5 min)
Carrier GasHe, constant flow
Flow Rate:6.19 mL/min
Dead Time:2.04 min @ 30 °C
DetectorFID @ 280 °C
Make-up Gas Flow Rate:45 mL/min
Make-up Gas Type:N2
Hydrogen flow:40 mL/min
Air flow:400 mL/min
Data Rate:50 Hz
InstrumentAgilent 7890A GC
Sample Preparation250 μL injected via gastight syringe (cat.# 24572).

 

Analysis of Hydrocarbons While Maintaining Separation of Neopentane Using Hydrogen Carrier Gas on the Rt-Alumina/MAPD

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GC_PC1385
PeakstR (min)Conc. (mol. %)
1.Methane1.1095.02
2.Ethane1.6934.027
3.Ethylene2.6981.989
4.Propane3.3286.03
5.Cyclopropane5.1020.03
6.Propene5.5833.026
7.Isobutane6.0335.028
8.Butane6.4144.028
9.Allene6.7780.983
10.Acetylene6.6821.013
11.2-Butene, (E)-10.0543.016
PeakstR (min)Conc. (mol. %)
12.1-Butene10.4122.015
13.Neopentane10.6590.013
14.1-Propene, 2-methyl-11.151.003
15.2-Butene, (Z)-11.4852.028
16.Butane, 2-methyl-11.7120.996
17.Pentane12.3432.013
18.1,3-Butadiene14.3143.016
19.2-Pentene, (E)-16.5440.201
20.2-Butene, 2-methyl-17.1750.211
21.1-Pentene17.4840.403
22.2-Pentene, (Z)-18.2050.402
23.Hexane20.1660.101
ColumnRt-Alumina/MAPD, 50 m, 0.53 mm ID, 10 µm (cat.# 19778)
Standard/SampleRefinery gas #4 (DCG Partnership, LTD)
Diluent:Helium
Conc.: 250 μL injected via gastight syringe (cat.# 24572)
Injection
Inj. Vol.:250 µL split (split ratio 10:1)
Liner:4.0 mm ID Topaz Precision liner w/ wool (cat.# 23305)
Inj. Temp.:280 °C
Split Vent Flow Rate:138.12 mL/min
Gas Saver Time:2 min
Gas Saver Flow Rate:20 mL/min
Oven
Oven Temp.:30 °C (hold 1 min) to 80 °C at 30 °C/min to 170 °C at 4 °C/min (hold 1 min)
Carrier GasH2, constant flow
Flow Rate:13.70 mL/min
Dead Time:0.92 min @ 30 °C
DetectorFID @ 280 °C
Make-up Gas Flow Rate:45 mL/min
Make-up Gas Type:N2
Hydrogen flow:40 mL/min
Air flow:400 mL/min
Data Rate:50 Hz
InstrumentAgilent 7890A GC
Sample Preparation250 μL injected via gastight syringe (cat.# 24572).

 

PCFA4183A-UNV