詳細烴組成分析儀 (DHA)

Detailed Hydrocarbon Analysis

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各碳氫化合物的組成分析，通常簡稱為詳細烴組成分析 (DHA)。依據 ASTM-D6730 標準，可判定汽油和其他火花點火引擎燃料的各碳氫化合物和添加劑組成，包含 PONA (石蠟烴 Paraffins、烯烴 Olefins、環烷烴 Naphthenes 和芳香烴 Aromatics) 和其他含氧混合物 (甲醇、乙醇、MTBE、ETBE 和 TAME)。PONA 分析物的鑑定，是藉由比對正烷烴的滯留指數 (Retention index) 進行判定。然而，PONA 分析之層析圖具有非常多的峰，如果沒有準確且良好再現性的滯留指數，不但可能判定錯誤，也可能得到錯誤的 PONA 比率。GC-2030 整合了先進流量控制器，可提供高精確度的流量控制，並且輕易分析和鑑定詳細烴組成。Shimadzu 提供符合以下方法的 DHA 分析儀：ASTM-D5134、ASTM-D6729、ASTM-D6730 和 ASTM-D6733。

DHA 分析層析圖範例

Example of a DHA analysis chromatogram

分析條件

Equipment PONA System (Nexis GC-2030AF)
Column Rtx-PONA, 100 m x 0.25 mm x 0.5 um
Pre-column Pre-PONA, 2 m x 0.25 mm x 1 μm
Col. Temp 5 ºC (hold 10 min) → 5 ºC/min → 48 ºC (hold 49 min) → 1.2 ºC/min → 200 ºC (5 min)
Carrier Gas He, Split 1:150 hold 5 min, split 1:20 for the rest time.
Sample size 0.2 μL
Injector 250 ºC
Detector 250 ºC
Cryogenic CRG-2030 with liquid CO2

專用軟體的摘要報告範例

Group Type Total Mass% Total Vol.% Total Mol%
Paraffins 15.868 17.1143 15.9838
Iso-Paraffins 19.495 20.8586 19.1926
Olefins 17.3556 18.5952 19.8748
Napthenes 20.6483 20.0522 21.3048
Aromatics 23.5425 20.3256 21.8861
Total C14+ 3.0907 3.054 1.7579
Total Unknowns 0 0 0
Total Oxygenates 0 0 0
Sample Total 100 100 100
多取代芳香烴：13.7740 (質量 %), 11.8683 (體積 %)
平均分子量：112.8396
雷德蒸汽壓 @ 100F: 1.9378
計算出的辛烷值：77.0250
  IBP T10 T50 T90 FBP
BP by mass (Deg. F) 82.11 153.14 227.16 402.10 488.66
BP by vol. (Deg. F) 82.11 146.25 274.10 401.72 488.66
碳百分比：86.7143 氫百分比：13.2857
溴值 (計算值)：22.8036

按類型和碳數的摘要範例 (以質量百分比表示)

Carbon Paraffins I-Paraffins Olefins Napthenes Aromatics Unknowns Total
C1 0 0 0 0 0 0 0
C2 0 0 0 0 0 0 0
C3 0 0 0 0 0 0 0
C4 0 0 0 0 0 0 0
C5 2.61412 0.39222 2.12534 1.02294 0 0 6.15463
C6 1.75622 1.74186 3.4275 1.83233 1.5174 0 10.27531
C7 1.78205 3.41605 4.85244 3.76943 1.02589 0 14.84587
C8 1.68547 4.74174 2.49244 6.10152 3.72353 0 18.74469
C9 1.74756 5.41724 3.0002
5.20934
 5.63764 0 21.01198
C10 1.60532 3.77676 1.45765 1.93379 6.87431 0 15.64782
C11 1.56754 0.0091 0 0.01491 1.45758 0 3.04912
C12 1.56411 0 0 0.76403 3.3061 0 5.63424
C13 1.54563 0 0 0 0 0 1.54563
Total C14+ 3.09070, Oxygenates 0.00000, Total Unknowns 0.00000, Grand Total 100.00000
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