### Abstract

Original language | English |
---|---|

Pages (from-to) | 15-20 |

Number of pages | 6 |

Journal | The Journal of Chemical Thermodynamics |

Volume | 105 |

DOIs | |

Publication status | Published - 1 Feb 2017 |

MoE publication type | A1 Journal article-refereed |

### Fingerprint

### Keywords

- fatty acid
- hydrogen solubility
- measurement
- resin acid
- tall oil
- Measurement

### Cite this

*The Journal of Chemical Thermodynamics*,

*105*, 15-20. https://doi.org/10.1016/j.jct.2016.10.008

}

*The Journal of Chemical Thermodynamics*, vol. 105, pp. 15-20. https://doi.org/10.1016/j.jct.2016.10.008

**Hydrogen solubility measurements of analyzed tall oil fractions and a solubility model.** / Uusi-Kyyny, Petri (Corresponding Author); Pakkanen, Minna; Linnekoski, Juha; Alopaeus, Ville.

Research output: Contribution to journal › Article › Scientific › peer-review

TY - JOUR

T1 - Hydrogen solubility measurements of analyzed tall oil fractions and a solubility model

AU - Uusi-Kyyny, Petri

AU - Pakkanen, Minna

AU - Linnekoski, Juha

AU - Alopaeus, Ville

N1 - ISI: THERMODYNAMICS

PY - 2017/2/1

Y1 - 2017/2/1

N2 - Knowledge of hydrogen solubility in tall oil fractions is important for designing hydrotreatment processes of these complex nonedible biobased materials. Unfortunately measurements of hydrogen solubility into these fractions are missing in the literature. This work reports hydrogen solubility measured in four tall oil fractions between 373 and 597 K and at pressures from 5 to 10 MPa. Three of the fractions were distilled tall oil fractions their resin acids contents are respectively 2, 20 and 23 in mass-%. Additionally one fraction was a crude tall oil (CTO) sample containing sterols as the main neutral fraction. Measurements were performed using a continuous flow synthetic isothermal and isobaric method based on the visual observation of the bubble point. Composition of the flow was changed step-wise for the bubble point composition determination. We assume that the tall oil fractions did not react during measurements, based on the composition analysis performed before and after the measurements. Additionally the densities of the fractions were measured at atmospheric pressure from 293.15 to 323.15 K. A Henry's law model was developed for the distilled tall oil fractions describing the solubility with an absolute average deviation of 2.1%. Inputs of the solubility model are temperature, total pressure and the density of the oil at 323.15 K. The solubility of hydrogen in the CTO sample can be described with the developed model with an absolute average deviation of 3.4%. The solubility of hydrogen increases both with increasing pressure and/or increasing temperature. The more dense fractions of the tall oil exhibit lower hydrogen solubility in comparison to the less dense fractions. The increase in the density of a fraction corresponds to an increased resin acid and sterol content of the sample. Sterols and resin acids exhibit lower hydrogen solubility in comparison to fatty acids.

AB - Knowledge of hydrogen solubility in tall oil fractions is important for designing hydrotreatment processes of these complex nonedible biobased materials. Unfortunately measurements of hydrogen solubility into these fractions are missing in the literature. This work reports hydrogen solubility measured in four tall oil fractions between 373 and 597 K and at pressures from 5 to 10 MPa. Three of the fractions were distilled tall oil fractions their resin acids contents are respectively 2, 20 and 23 in mass-%. Additionally one fraction was a crude tall oil (CTO) sample containing sterols as the main neutral fraction. Measurements were performed using a continuous flow synthetic isothermal and isobaric method based on the visual observation of the bubble point. Composition of the flow was changed step-wise for the bubble point composition determination. We assume that the tall oil fractions did not react during measurements, based on the composition analysis performed before and after the measurements. Additionally the densities of the fractions were measured at atmospheric pressure from 293.15 to 323.15 K. A Henry's law model was developed for the distilled tall oil fractions describing the solubility with an absolute average deviation of 2.1%. Inputs of the solubility model are temperature, total pressure and the density of the oil at 323.15 K. The solubility of hydrogen in the CTO sample can be described with the developed model with an absolute average deviation of 3.4%. The solubility of hydrogen increases both with increasing pressure and/or increasing temperature. The more dense fractions of the tall oil exhibit lower hydrogen solubility in comparison to the less dense fractions. The increase in the density of a fraction corresponds to an increased resin acid and sterol content of the sample. Sterols and resin acids exhibit lower hydrogen solubility in comparison to fatty acids.

KW - fatty acid

KW - hydrogen solubility

KW - measurement

KW - resin acid

KW - tall oil

KW - Measurement

UR - http://www.scopus.com/inward/record.url?scp=84990875174&partnerID=8YFLogxK

U2 - 10.1016/j.jct.2016.10.008

DO - 10.1016/j.jct.2016.10.008

M3 - Article

VL - 105

SP - 15

EP - 20

JO - The Journal of Chemical Thermodynamics

JF - The Journal of Chemical Thermodynamics

SN - 0021-9614

ER -