Study of variables that affect the corrosion of sour water strippers

Book · Thu Jan 01 04:00:00 EST 1976

OSTI ID:5032782

The variables that affect corrosion in the sour water stripper system NH/sub 3/-H/sub 2/S-KCN-H/sub 2/O have been studied in an atmospheric pressure glass loop system. Results indicated that as little as 1 to 4 percent NH/sub 3/ (saturated with H/sub 2/S) was corrosive to steel as long as cyanide was present in this system. The role of the cyanide was to destroy the normally protective sulfide film on the steel probably by forming a soluble ferrocyanide complex (although there were some data that suggested the formation of Fe(SCN)/sub 3/ as the corrosion product). Results also suggested that high NH/sub 3/ contents in NH/sub 3/-H/sub 2/S-KCN systems were more corrosive to steel and that high corrosion rates were also associated with NH/sub 4/HS in the system (when cyanide also was present). Oxygen in the system reduced the rate of attack on steel presumably by forming polysulfides. Type 304 stainless steel did not corrode under the conditions that produced accelerated attack of steel. However, the stainless steel did corrode at accelerated rates in these solutions when it was activated by cathodic charging to remove its protective film.

• OSTI ID: 5032782
• Report Number(s): API-Publ-948
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400 -- Petroleum-- Processing
020800* -- Petroleum-- Waste Management
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ACID SULFATES
ALKALI METAL COMPOUNDS
ALLOYS
AMMONIA
AMMONIUM COMPOUNDS
AQUEOUS SOLUTIONS
CATHODIC PROTECTION
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION
CORROSION PROTECTION
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
CYANIDES
DISPERSIONS
HEAT RESISTING ALLOYS
HYDRIDES
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
IRON ALLOYS
IRON BASE ALLOYS
MANAGEMENT
MIXTURES
NICKEL ALLOYS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OXYGEN COMPOUNDS
PETROLEUM REFINERIES
POTASSIUM COMPOUNDS
PROCESSING
SOLUTIONS
STAINLESS STEEL-304
STAINLESS STEELS
STEELS
SULFIDES
SULFUR COMPOUNDS
WASTE MANAGEMENT
WASTE PROCESSING
WATER