You need JavaScript to view this

A study of the methane hydrate formation by in situ turbidimetry

Abstract

The study of the Particle Size Distribution (PSD) during the processes of crystallization is a subject of considerable interest, notably in the offshore exploitation of liquid fuels where the gas hydrate crystallization can plug production, treatment and transport facilities. The classical remedy to this problem is mainly thermodynamic additives such as alcohols or salts, but a new way of research is the use of dispersant additives which avoid crystals formation. In this paper, we show an original apparatus that is able to measure in situ the polychromatic UV-Visible turbidity spectrum in a pressurised reactor. We apply this technology to the calculation of the PSD during the crystallization of methane hydrate particles in a stirred semi-batch tank reactor. We discuss the mathematics treatment of the turbidity spectrum in order to determine the PSD and especially the method of matrix inversion with constraint. Moreover, we give a method to calculate theoretically the refractive index of the hydrate particles and we validate it experimentally with the methane hydrate particles. We apply this technology to the study of the crystallization of methane hydrate from pure liquid water and methane gas into the range of temperature [0-2 deg. C], into the range of pressure [30-100  More>>
Authors:
Publication Date:
Feb 02, 1996
Product Type:
Thesis/Dissertation
Report Number:
IFP-42903
Reference Number:
SCA: 022000; 400201; PA: FRC-96:003275; EDB-96:133865; NTS-97:002297; SN: 96001650851
Resource Relation:
Other Information: TH: These (D. es Sc.); PBD: 2 Feb 1996
Subject:
02 PETROLEUM; 40 CHEMISTRY; GAS HYDRATES; PETROLEUM PRODUCTS; PIPELINES; CRYSTALLIZATION; GERMINATION; CRYSTAL GROWTH; CHEMICAL REACTION KINETICS; WATER; METHANE; POTASSIUM CHLORIDES; PVP; TURBIDITY; SUSPENSIONS; REFRACTIVE INDEX; POLARIZABILITY; SCATTERING; GRAIN SIZE; ADDITIVES; MATHEMATICAL MODELS
OSTI ID:
288267
Research Organizations:
Institut Francais du Petrole (IFP), 92 - Rueil-Malmaison (France); Ecole Nationale Superieure du Petrole et des Moteurs (ENSPM), 92 - Rueil-Malmaison (France); Paris-6 Univ., 75 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
Other: ON: DE96779604; TRN: FR9603275
Availability:
OSTI as DE96779604
Submitting Site:
FR
Size:
177 p.
Announcement Date:
Sep 26, 1996

Citation Formats

Herri, J M. A study of the methane hydrate formation by in situ turbidimetry. France: N. p., 1996. Web.
Herri, J M. A study of the methane hydrate formation by in situ turbidimetry. France.
Herri, J M. 1996. "A study of the methane hydrate formation by in situ turbidimetry." France.
@misc{etde_288267,
title = {A study of the methane hydrate formation by in situ turbidimetry}
author = {Herri, J M}
abstractNote = {The study of the Particle Size Distribution (PSD) during the processes of crystallization is a subject of considerable interest, notably in the offshore exploitation of liquid fuels where the gas hydrate crystallization can plug production, treatment and transport facilities. The classical remedy to this problem is mainly thermodynamic additives such as alcohols or salts, but a new way of research is the use of dispersant additives which avoid crystals formation. In this paper, we show an original apparatus that is able to measure in situ the polychromatic UV-Visible turbidity spectrum in a pressurised reactor. We apply this technology to the calculation of the PSD during the crystallization of methane hydrate particles in a stirred semi-batch tank reactor. We discuss the mathematics treatment of the turbidity spectrum in order to determine the PSD and especially the method of matrix inversion with constraint. Moreover, we give a method to calculate theoretically the refractive index of the hydrate particles and we validate it experimentally with the methane hydrate particles. We apply this technology to the study of the crystallization of methane hydrate from pure liquid water and methane gas into the range of temperature [0-2 deg. C], into the range of pressure [30-100 bars] and into the range of stirring rate [0-600 rpm]. We produce a set of experiments concerning these parameters. Then we realize a model of the crystallization taking into account the processes of nucleation, of growth, of agglomeration and flotation. We compare this model with the experimental results concerning the complex influence of stirring rate at 1 deg. C and 30 bars. Then, we investigate the influence of additives such as Fontainebleau Sand, Potassium Chloride and a surfactant such as Poly-Vinyl-Pyrrolydone. (authors). 133 refs., 210 figs., 54 tabs.}
place = {France}
year = {1996}
month = {Feb}
}