# Debutanizer Column

## LPG LNG CNG

|   | LPG                                               | LNG                         | CNG                             |
| - | ------------------------------------------------- | --------------------------- | ------------------------------- |
|   | Propane and Butane                                | Methane                     | Methane cryogenically liquefied |
|   | C3H8 and C4H10                                    | CH4                         |                                 |
|   | 93.2 MJ/m3                                        | 38.7 MJ/m3                  |                                 |
|   | Derived form NG processing and crude oil refining | Natural Gas                 |                                 |
|   | Propane is heavier than air                       | Methane is lighter than air |                                 |
|   |                                                   |                             |                                 |

## Pronounciation

* **Propane** ([/ˈproʊpeɪn/](https://en.wikipedia.org/wiki/Help:IPA/English))
* **Butane** ([/ˈbjuːteɪn/](https://en.wikipedia.org/wiki/Help:IPA/English))
* Isopenten /i.zɔ.pɛ̃.tan/

## Natural Gas Processing

Raw natural gas typically consists primarily of [methane](https://en.wikipedia.org/wiki/Methane) (CH4) and [ethane](https://en.wikipedia.org/wiki/Ethane) (C2H6) and also contains

* Heavier gaseous hydrocarbons: [propane](https://en.wikipedia.org/wiki/Propane) (C3H8), [normal butane](https://en.wikipedia.org/wiki/Butane) (n-C4H10), [isobutane](https://en.wikipedia.org/wiki/Isobutane) (i-C4H10) and [pentanes](https://en.wikipedia.org/wiki/Pentane).
* CO2, H2S, N2, He

## NGL Fractionation

* The recovered NGL stream is processed through a fractionation train consisting of up to five distillation towers in series: a **demethanizer**, a **deethanizer**, a **depropanizer,** a **debutanizer** and a **butane splitter**.
* In the debutanizer column C3 (propane) and C4 (butane) are removed as overheads from the naphtha stream.


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