Corrosion problems in distillation of coal liquid products
Severe corrosion in the distillation area of four coal liquefaction pilot plants is described. In all cases it was concluded that chloride, which is a minor constituent of coal, was responsible for the problems. Bench-scale experiments undertaken to determine the chemical form of the corrosive chloride revealed that water-soluble chloride was highly corrosive when present with a Bronstead acid cation, specifically in the form of basic nitrogen compound hydrochlorides. Phenols present in coal liquids aided in the localization of the corrosion. The path of the chloride through one process is described. Possible solutions to the corrosion problem consist mostly of either preventing the concentration of chloride in the affected area, reducing the chlorides to a less corrosive form, using more corrosion-resistant alloys, or a combination of these. The advantages and drawbacks of each method is briefly discussed. (CKK)
- Research Organization:
- Univ. of Kentucky, Lexington
- OSTI ID:
- 6202183
- Journal Information:
- Mater. Compon. Fossil Energy Appl.; (United States), Journal Name: Mater. Compon. Fossil Energy Appl.; (United States) Vol. 43; ISSN MCFAD
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
AROMATICS
BENCH-SCALE EXPERIMENTS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COAL LIQUEFACTION
COAL LIQUEFACTION PLANTS
COAL LIQUIDS
CONTROL
CORROSION
CORROSIVE EFFECTS
DISTILLATION
DISTILLATION EQUIPMENT
EQUIPMENT
EXXON LIQUEFACTION PROCESS
FLUIDS
FUNCTIONAL MODELS
H-COAL PROCESS
HALIDES
HALOGEN COMPOUNDS
HYDROXY COMPOUNDS
INDUSTRIAL PLANTS
LIQUEFACTION
LIQUIDS
ORGANIC COMPOUNDS
PHENOLS
PILOT PLANTS
SEPARATION PROCESSES
SRC PROCESS
SRC-II PROCESS
THERMOCHEMICAL PROCESSES