Corrosion in fractionation systems

Conference · Thu Jan 01 04:00:00 EST 1981

OSTI ID:5967349

Bradley, R A; Keiser, J R; Judkins, R R; Baylor, V B; DeVan, J H

All data collected to date suggest that chlorine, as water-soluble chlorides, is necessary, albeit not sufficient, to cause the accelerated corrosion observed in pilot plant fractionation columns. We thus have proposed mechanisms for the transportation of chlorine to the fractionation columns, for the concentration of chlorine in these columns, and for the corrosion of the materials of construction of these columns. The source of the chlorine is the coal feed. When the coal is fed to the dissolver vessels, hydrogen chloride may be formed by volatilization or by hydrolysis of chloride salts followed by volatilization. The latter mode of hydrogen chloride formation and evolution is described by chemical equations. Recent analyses of the aqueous portion of a pilot plant stream (specifically, RPWT water) used infrared spectroscopy to confirm the presence of amine hydrochlorides. These amine hydrochlorides are transported in liquid streams to the fractionation area. Once fed to the fractionation column the amine hydrochlorides may concentrate on particular trays in the column. The concentrating mechanism we have proposed consists of volatilization, with dissociation, of the amine hydrochlorides, movement of the volatile amines and hydrogen chloride to cooler regions of the column where reassociation occurs, then flow of the amine hydrochlorides back down the column. The result of this reflux action is the concentration of amine hydrochlorides at various tray levels. Washing the coal liquids with water to remove the water-soluble chlorides and the addition of certain amines are proposed as methods for reducing the corrosion.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5967349
• Report Number(s): CONF-811061-3; ON: DE82001441
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
AMINES
CARBONACEOUS MATERIALS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
CLEANING
COAL
COAL LIQUEFACTION
COAL LIQUIDS
COMPARATIVE EVALUATIONS
CORROSION
CORROSION INHIBITORS
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
DATA
DISTILLATION EQUIPMENT
ENERGY SOURCES
EQUIPMENT
EXPERIMENTAL DATA
FLUIDS
FOSSIL FUELS
FRACTIONATION
FUELS
FUNCTIONAL MODELS
HALIDES
HALOGEN COMPOUNDS
INFORMATION
INFRARED SPECTROMETERS
IRON ALLOYS
IRON BASE ALLOYS
LIQUEFACTION
LIQUIDS
MATERIALS
MATERIALS TESTING
MEASURING INSTRUMENTS
NUMERICAL DATA
ORGANIC COMPOUNDS
PILOT PLANTS
SEPARATION PROCESSES
SPECTROMETERS
SRC PROCESS
STAINLESS STEELS
STEELS
TEMPERATURE DEPENDENCE
TESTING
THERMOCHEMICAL PROCESSES
WASHING