Near infrared spectroscopy applied for high-pressure phase behavior measurements

被引：10

作者：

Borges, Gustavo R. ^{[1
]}

Lucas, Marcos A. ^{[1
,2
]}

de Moura Nunes, Rafael B. ^{[1
]}

Amaral, Monique de Jesus ^{[1
]}

Franceschi, Elton ^{[1
]}

Santos, Alexandre F. ^{[3
]}

Dariva, Claudio ^{[1
]}

机构：

[1] PEP PBI UNIT, Nucleo Estudos Sistemas Coloidais NUESC ITP, BR-49032490 Aracaju, SE, Brazil

[2] Petroleo Brasileiro SA, BR-49080010 Aracaju, SE, Brazil

[3] UFPR, Ctr Politecn, DEQ, BR-81531980 Curitiba, PR, Brazil

来源：

JOURNAL OF SUPERCRITICAL FLUIDS | 2015年 / 104卷

关键词：

Near infrared; phase behavior; petroleum systems; carbon dioxide; VAPOR-LIQUID-EQUILIBRIA; CARBON-DIOXIDE; DIAGRAMS; MIXTURES; WATER; APPARATUS; METHANOL;

D O I：

10.1016/j.supflu.2015.06.015

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This work presents a new technique for phase behavior monitoring at high-pressure conditions. The consolidated synthetic method was modified by insertion of a near infrared probe inside the high-pressure variable-volume view cell. A system composed by carbon dioxide and a distilled petroleum fraction was used to validate the proposed methodology. The experiments were performed in the temperature range of 293-333 K, carbon dioxide mass fraction of 0.350-0.900 and pressures up to 20 MPa. The phase transitions pressures visually observed were compared with those detected by the spectrophotometer and good correlations were obtained with global mean deviation of 1.4%. Besides, it was possible to identify the type of vapor-liquid phase transitions (bubble or dew points) and the position at diagram (before or after the critical concentration) for the liquid-liquid equilibrium. The proposed methodology is promptly extended to several others systems. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：221 / 226

页数：6

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