Pure Chromatography
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Alkylate Standard on Rtx-DHA 50 by Method D5134-13
| Peaks | Kovats RI @ 35 °C | D5134-13 RI Comparison | Linear RI | D5134-13 RI Comparison | |
|---|---|---|---|---|---|
| 1. | Isobutane | -- | 367.3 | -- | -- |
| 2. | n-Butane | 400.0 | 400.0 | -- | -- |
| 3. | Isopentane | 475.0 | 475.0 | -- | -- |
| 4. | n-Pentane | 500.0 | 500.0 | -- | -- |
| 5. | 2,3-Dimethylbutane | 565.4 | 565.5 | -- | -- |
| 6. | 2-Methylpentane | 569.2 | 569.5 | -- | -- |
| 7. | 3-Methylpentane | 583.1 | 583.4 | -- | -- |
| 8. | 2,4-Dimethylpentane | 629.9 | 630.3 | -- | -- |
| 9. | 2,2,3-Trimethylbutane | 635.1 | 635.4 | -- | -- |
| 10. | 2-Methylhexane | 667.2 | 667.8 | -- | -- |
| 11. | 2,3-Dimethylpentane | 668.6 | 669.1 | -- | -- |
| 12. | 3-Methylhexane | 675.5 | 676.2 | -- | -- |
| 13. | 2,2,4-Trimethylpentane | 689.9 | 688.7 | -- | -- |
| 14. | 2,2,3-Trimethylpentane/2,5-dimethylhexane | 731.5* | 731.9 | -- | -- |
| 15. | 2,4-Dimethylhexane | 733.2* | 733.5 | -- | -- |
| 16. | 2,3,4-Trimethylpentane | 747.1* | 747.8 | -- | -- |
| 17. | 2,3,3-Trimethylpentane | 750.0* | 751.1 | 730.4* | 730.2 |
| 18. | 2,3-Dimethylhexane | -- | -- | 744.4* | 743.6 |
| 19. | 2-Methylheptane | -- | -- | 754.0* | 754.1 |
| 20. | 4-Methylheptane/3,4-dimethylhexane (isomer) | -- | -- | 756.3* | 756.0 |
| 21. | 3,4-Dimethylhexane (isomer) | -- | -- | 763.6* | 763.4 |
| 22. | 3-Methylheptane | -- | -- | 754.0* | 754.1 |
| 23. | 2,2,5-Trimethylhexane | -- | -- | 779.7* | 778.8 |
| 24. | 2,2,4-Trimethylhexane | -- | -- | 786.4* | 785.1 |
| 25. | 2,4,4-Trimethylhexane | -- | -- | 805.4 | 805.7 |
| 26. | 2,3,5-Trimethylhexane | -- | -- | 817.4 | 817.7 |
| 27. | 2,4-Dimethylheptane | -- | -- | 826.1 | 826.6 |
| 28. | 2,6-Dimethylheptane | -- | -- | 833.4 | 833.8 |
| 29. | 2,5-Dimethylheptane | -- | -- | 839.9 | 840.3 |
| 30. | 2,3,4-Trimethylhexane | -- | -- | 849.7 | -- |
| 31. | 2,3-Dimethylheptane | -- | -- | 860.0 | 860.4 |
| 32. | 2,4,6-Trimethylheptane | -- | -- | 878.6 | -- |
*Extrapolated from n-C6 and n-C7 or from n-C8 and n-C9
GC_PC1319
| Column | Rtx-DHA-50, 50 m, 0.20 mm ID, 0.50 µm (cat.# 10147) |
| Sample | ASTM D5134 qualitative reference alkylate standard (DCG Partnership I, LTD) |
| Injection | |
| Inj. Vol.: | 0.2 µL split (split ratio 200:1) |
| Liner: | Premium 4.0 mm ID Precision inlet liner w/ wool (cat.# 23305.5) |
| Inj. Temp.: | 200 °C |
| Oven | |
| Oven Temp.: | 35 °C (hold 30 min) to 200 °C at 2 °C/min |
| Carrier Gas | He, constant pressure |
| Linear Velocity: | 23 cm/sec |
| Detector | FID @ 250 °C |
| Make-up Gas Flow Rate: | 30 mL/min |
| Make-up Gas Type: | N2 |
| Hydrogen flow: | 40 mL/min |
| Air flow: | 370 mL/min |
| Instrument | Agilent 7890B GC |
| Notes | Understanding the hydrocarbon components in petroleum samples is useful for sample characterization, determining product quality, planning and modeling of refinery processes, and also for regulatory purposes. ASTM D5134-13 provides the composition of paraffin, naphthenes, and monoaromatic compounds up to n-C9 in petroleum naphthas, reformates, and alkalytes. This method is run using a long, narrow-bore column, which has a limited sample loading capacity. Therefore, high split is used and a small sample volume is injected. Restek’s Rtx-DHA-50 column is a good match for this analysis; retention index (RI) data are in agreement with the RI data provided in the method. |
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Restek Corporation, U.S., 110 Benner Circle, Bellefonte, PA 16823
Copyright © 2021 Restek Corporation. All rights reserved.
A Company of Owners
Cookies allow for a variety of features that make your visit to Restek more enjoyable. By using this website, you agree to the use of cookies in accordance with our guidelines. For more information, see our privacy policy.