TY - JOUR

T1 - Study of asphaltene precipitation by Calorimetry

A1 - Verdier,Sylvain Charles Roland

A1 - Plantier,Frédéric

A1 - Bessières,David

A1 - Andersen,Simon Ivar

A1 - Stenby,Erling Halfdan

A1 - Carrier,Hervé

AU - Verdier,Sylvain Charles Roland

AU - Plantier,Frédéric

AU - Bessières,David

AU - Andersen,Simon Ivar

AU - Stenby,Erling Halfdan

AU - Carrier,Hervé

PB - American Chemical Society

PY - 2007

Y1 - 2007

N2 - Can calorimetry bring new input to the Current understanding of asphaltene precipitation? In this work, two types of precipitation were studied by means of calorimetry: addition of n-heptane into asphaltene solutions and temperature/pressure variations on a recombined live oil. The first series of experiments showed that weak forces determine precipitation. Indeed, isothermal titration calorimetry could not detect any clear signal although this technique can detect low-energy transitions such as liquid-liquid equilibrium and rnicellization. The second series of tests proved that precipitation caused by T and P variations is exothermic for this system. Furthermore, the temperature-induced precipitation is accompanied by an increase in the apparent thermal expansivity. Therefore, it seems that these two phase transitions exhibit different calorimetric behaviours and they may not be as similar as expected.

AB - Can calorimetry bring new input to the Current understanding of asphaltene precipitation? In this work, two types of precipitation were studied by means of calorimetry: addition of n-heptane into asphaltene solutions and temperature/pressure variations on a recombined live oil. The first series of experiments showed that weak forces determine precipitation. Indeed, isothermal titration calorimetry could not detect any clear signal although this technique can detect low-energy transitions such as liquid-liquid equilibrium and rnicellization. The second series of tests proved that precipitation caused by T and P variations is exothermic for this system. Furthermore, the temperature-induced precipitation is accompanied by an increase in the apparent thermal expansivity. Therefore, it seems that these two phase transitions exhibit different calorimetric behaviours and they may not be as similar as expected.

U2 - 10.1021/ef700316e

DO - 10.1021/ef700316e

JO - Energy & Fuels

JF - Energy & Fuels

SN - 0887-0624

IS - 6

VL - 21

SP - 3583

EP - 3587

ER -