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Crystal growth of FeCO 3 in mixed monoethylene glycol and water solvent
Author(s) -
Figueiredo Camila M. Senna,
Junior Amaro G. Barreto,
Flaten Ellen Marie,
Beck Ralf,
Seiersten Marion
Publication year - 2015
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201400420
Subject(s) - supersaturation , chemistry , ferrous , solubility , crystal growth , growth rate , hydrate , siderite , reaction rate constant , kinetics , inorganic chemistry , chemical engineering , analytical chemistry (journal) , mineralogy , calcite , crystallography , chromatography , organic chemistry , physics , quantum mechanics , engineering , geometry , mathematics
The transportation of natural gas in long subsea pipelines is a challenge when it comes to hydrate prevention, corrosion and mineral scaling. When monoethylene glycol (MEG) is injected into carbon steel pipelines to prevent formation of gas hydrates, the solubility of the corrosion products is altered. Understanding the kinetics of FeCO 3 precipitation may make it possible to avoid deposition in the gas liquid separation process and improve solids removal in MEG recovery units. In this work, the growth kinetics of iron carbonate (siderite) has been studied in seeded batch experiments in MEG‐water solutions with 0 and 40 wt% MEG at 50 and 70 °C. Precautions were taken to keep anaerobic conditions and avoid oxidation of ferrous ions. The growth rate (G) was measured as function of supersaturation (S) and fitted to the equation: G = k r (S‐1) g . The growth order ( g ) was approximately 2 independent of the MEG concentration at the two temperatures. The growth rate constant (k r ) was in the range of 6 × 10 −11 to 1 × 10 −10 m/s. Temperature increase from 50 to 70°C had no measurable effect on the growth rate while in the presence of 40 wt% MEG the growth rate constant decreased.