Excellent Separation of Neopentane and C4 Hydrocarbons

• 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

	Peaks	tR (min)	Conc. (mol. %)
1.	Methane	2.422	5.02
2.	Ethane	3.433	4.027
3.	Ethylene	4.866	1.989
4.	Propane	5.99	6.03
5.	Cyclopropane	8.898	0.03
6.	Propene	9.657	3.026
7.	Isobutane	10.493	5.028
8.	Butane	11.044	4.028
9.	Allene	11.334	0.983
10.	Acetylene	11.334	1.013
11.	2-Butene, (E)-	15.071	3.016

	Peaks	tR (min)	Conc. (mol. %)
12.	1-Butene	15.452	2.015
13.	Neopentane	15.976	0.013
14.	1-Propene, 2-methyl-	16.118	1.003
15.	2-Butene, (Z)-	16.45	2.028
16.	Butane, 2-methyl-	17.005	0.996
17.	Pentane	17.576	2.013
18.	1,3-Butadiene	18.892	3.016
19.	2-Pentene, (E)-	20.787	0.201
20.	2-Butene, 2-methyl-	21.274	0.211
21.	1-Pentene	21.593	0.403
22.	2-Pentene, (Z)-	22.107	0.402
23.	Hexane	24.025	0.401

Column	Rt-Alumina/MAPD, 50 m, 0.53 mm ID, 10 µm (cat.# 19778)
Standard/Sample	Refinery 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 Gas	He, constant flow
Flow Rate:	6.19 mL/min
Dead Time:	2.04 min @ 30 °C

Detector	FID @ 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
Instrument	Agilent 7890A GC
Sample Preparation	250 μL injected via gastight syringe (cat.# 24572).

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

	Peaks	tR (min)	Conc. (mol. %)
1.	Methane	1.109	5.02
2.	Ethane	1.693	4.027
3.	Ethylene	2.698	1.989
4.	Propane	3.328	6.03
5.	Cyclopropane	5.102	0.03
6.	Propene	5.583	3.026
7.	Isobutane	6.033	5.028
8.	Butane	6.414	4.028
9.	Allene	6.778	0.983
10.	Acetylene	6.682	1.013
11.	2-Butene, (E)-	10.054	3.016

	Peaks	tR (min)	Conc. (mol. %)
12.	1-Butene	10.412	2.015
13.	Neopentane	10.659	0.013
14.	1-Propene, 2-methyl-	11.15	1.003
15.	2-Butene, (Z)-	11.485	2.028
16.	Butane, 2-methyl-	11.712	0.996
17.	Pentane	12.343	2.013
18.	1,3-Butadiene	14.314	3.016
19.	2-Pentene, (E)-	16.544	0.201
20.	2-Butene, 2-methyl-	17.175	0.211
21.	1-Pentene	17.484	0.403
22.	2-Pentene, (Z)-	18.205	0.402
23.	Hexane	20.166	0.101

Column	Rt-Alumina/MAPD, 50 m, 0.53 mm ID, 10 µm (cat.# 19778)
Standard/Sample	Refinery 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 Gas	H2, constant flow
Flow Rate:	13.70 mL/min
Dead Time:	0.92 min @ 30 °C

Detector	FID @ 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
Instrument	Agilent 7890A GC
Sample Preparation	250 μL injected via gastight syringe (cat.# 24572).

Télécharger le PDF