On the Mass Balance of Asphaltene Precipitation

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In the evaluation of experimental data as well as in calculation of phase equilibria the necessity of the application of mass balances is obvious. In the case of asphaltenes the colloidal nature of these compounds may highly affect the mass balance. In the present paper several experiments are performed in order to check the consistency of mass balances within asphaltene precipitation. Asphaltenes are precipitated in two step processes either by changing temperature or by changes in precipitant with increasing precipitation power. This has been performed for three different oils. The data indicates that in temperature experiments as well as in solvent series experiments the precipitation of heavy asphaltenes affects the following precipitation of lighter asphaltenes. In both cases the mass balance using standard separation techniques cannot be closed, as less material is precipitated in a two step process than in the direct process either at low temperature or by direct precipitation with one precipitant. The different fractions were subject to HPLC size exclusion chromtagraphy showing that the material remaining in solution in the stepwise process was of low molecular weight, and that the material in the second precipitation step was often of higher apparent molecular weight anti had an increased overall absorbance coefficient.
Original languageEnglish
JournalPetroleum Science and Technology
Volume19
Issue number3-4
Pages (from-to)457-467
ISSN1091-6466
DOIs
Publication statusPublished - 2001

Cite this

@article{d9c1297f339d4eb7a698211da8e449eb,
title = "On the Mass Balance of Asphaltene Precipitation",
abstract = "In the evaluation of experimental data as well as in calculation of phase equilibria the necessity of the application of mass balances is obvious. In the case of asphaltenes the colloidal nature of these compounds may highly affect the mass balance. In the present paper several experiments are performed in order to check the consistency of mass balances within asphaltene precipitation. Asphaltenes are precipitated in two step processes either by changing temperature or by changes in precipitant with increasing precipitation power. This has been performed for three different oils. The data indicates that in temperature experiments as well as in solvent series experiments the precipitation of heavy asphaltenes affects the following precipitation of lighter asphaltenes. In both cases the mass balance using standard separation techniques cannot be closed, as less material is precipitated in a two step process than in the direct process either at low temperature or by direct precipitation with one precipitant. The different fractions were subject to HPLC size exclusion chromtagraphy showing that the material remaining in solution in the stepwise process was of low molecular weight, and that the material in the second precipitation step was often of higher apparent molecular weight anti had an increased overall absorbance coefficient.",
author = "Andersen, {Simon Ivar} and C. Lira-Galeana and Stenby, {Erling Halfdan}",
year = "2001",
doi = "10.1081/LFT-100000776",
language = "English",
volume = "19",
pages = "457--467",
journal = "Petroleum Science and Technology",
issn = "1091-6466",
publisher = "Taylor & Francis Inc.",
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}

On the Mass Balance of Asphaltene Precipitation. / Andersen, Simon Ivar; Lira-Galeana, C.; Stenby, Erling Halfdan.

In: Petroleum Science and Technology, Vol. 19, No. 3-4, 2001, p. 457-467.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - On the Mass Balance of Asphaltene Precipitation

AU - Andersen, Simon Ivar

AU - Lira-Galeana, C.

AU - Stenby, Erling Halfdan

PY - 2001

Y1 - 2001

N2 - In the evaluation of experimental data as well as in calculation of phase equilibria the necessity of the application of mass balances is obvious. In the case of asphaltenes the colloidal nature of these compounds may highly affect the mass balance. In the present paper several experiments are performed in order to check the consistency of mass balances within asphaltene precipitation. Asphaltenes are precipitated in two step processes either by changing temperature or by changes in precipitant with increasing precipitation power. This has been performed for three different oils. The data indicates that in temperature experiments as well as in solvent series experiments the precipitation of heavy asphaltenes affects the following precipitation of lighter asphaltenes. In both cases the mass balance using standard separation techniques cannot be closed, as less material is precipitated in a two step process than in the direct process either at low temperature or by direct precipitation with one precipitant. The different fractions were subject to HPLC size exclusion chromtagraphy showing that the material remaining in solution in the stepwise process was of low molecular weight, and that the material in the second precipitation step was often of higher apparent molecular weight anti had an increased overall absorbance coefficient.

AB - In the evaluation of experimental data as well as in calculation of phase equilibria the necessity of the application of mass balances is obvious. In the case of asphaltenes the colloidal nature of these compounds may highly affect the mass balance. In the present paper several experiments are performed in order to check the consistency of mass balances within asphaltene precipitation. Asphaltenes are precipitated in two step processes either by changing temperature or by changes in precipitant with increasing precipitation power. This has been performed for three different oils. The data indicates that in temperature experiments as well as in solvent series experiments the precipitation of heavy asphaltenes affects the following precipitation of lighter asphaltenes. In both cases the mass balance using standard separation techniques cannot be closed, as less material is precipitated in a two step process than in the direct process either at low temperature or by direct precipitation with one precipitant. The different fractions were subject to HPLC size exclusion chromtagraphy showing that the material remaining in solution in the stepwise process was of low molecular weight, and that the material in the second precipitation step was often of higher apparent molecular weight anti had an increased overall absorbance coefficient.

U2 - 10.1081/LFT-100000776

DO - 10.1081/LFT-100000776

M3 - Journal article

VL - 19

SP - 457

EP - 467

JO - Petroleum Science and Technology

JF - Petroleum Science and Technology

SN - 1091-6466

IS - 3-4

ER -