Coal liquids distillation tower corrosion: chloride analysis of solvent refined coal process samples

Coal liquids distillation tower corrosion. Synergistic effects of chlorides, phenols, and basic nitrogen compounds

“…Throughout this paper, whenever additions are made to a fraction, the ppm levels shown are calculated on the weight basis of the initial whole liquid. Phenols (containing also some small amounts of basic nitrogen compounds) were removed from the as-received tray 9 liquid as outlined elsewhere (Scheme II; Davis et al, 1980). The oil layer was washed with water and dried by passing it through filter paper.…”

“…The balance is predominantly hydrocarbons with minor amounts of neutral heterocyclic compounds (nitrogen, sulfur, and oxygen). This liquid composition is virtually the same during periods of high or low corrosivity (Davis et al, 1980). The only significant difference is that the chloride concentration was very low (less than 10 ppm) ©…”

Corrosion and materials selection report update non-proprietary version. Final technical report

“…The columns, vessels, and tanks are aluminum and plate-fin-coves are brazed aluminum. (1 Coal Preparation ( 2 1Product Storage 3Waste Treatment 4Steam System (5 Power System O r i g i n a l l y , the waste water treatment system was included i n t h i s area. However, a l a t e r waste water treatment design was performed by C a t a l y t i c .…”

“…L a t e s t p i l o t p l a n t c o r r o s i o n data and review o f t h e o r i g i n a l Design Baseline, r e s u l t e d i n m e t a l l u r g i c a l changes as w e l l as increased c o r r o s i o n allowance t o b o t h equipment and p i p i n g . These changes and m o d i f i c a t i o n s were incorporated i n t h e Revised Design Base1 i n e(October 22, 1982) 5…”

Corrosion of Carbon Steel in Phenol Solutions Containing Amine Hydrochlorides: Impressed Current, Fluid Motion, and Concentration Effects

“…[1][2][3][4] The coal-derived liquids contain significant amounts of phenols (reaching the 50% level), basic nitrogen compounds (1 to 5%), and neutral hydrocarbons as the remaining major constituent. 5 Severe corrosion occurs only when chloride is present in a water soluble form at concentrations typically in the 100 to 1000 ppm range. An extensive series of laboratory experiments and analyses6-8 of actual process liquids have shown that for water-free tower environments, corrosion of carbon steel proceeds by a reaction with approximately the stoichiometry: where A is a basic nitrogen compound and AHCI is the hydrochloride of the basic nitrogen compound.…”