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Title: Interactive chemistry of coal-petroleum processing: Quarterly progress report for March 15, 1987-June 15, 1987. [Effect of coal or resid on reaction]

The thermal reactions of model compounds NAPH, DMC, PN, BZT, and QN with Maya TLR (topped long resid) showed no reactions. The presence of Maya TLR blocked the intermediate hydrogenation pathway from QN to THQ compared to the reaction without Maya TLR where 13% THQ was formed. Maya TLR served as a strong inhibitor in the catalytic hydrogenations of model compounds, being more detrimental to the hydrogenation and heteroatom removal reactions than coal. The severe inhibition of Maya TLR is caused by the chemical composition of the resid. The resid contains large refractory hydrocarbon species and substantial amounts of metals. Maya TLR was most likely deactivating the NiMo/Al/sub 2/O/sub 3/ catalyst as well as possibly interacting with model species present. Catalyst deactivation due to pore-plugging by petroleum crude and residua reaction products from hydrotreating, i.e., metal sulfides and coke has been studied by Newson. In crude oils and residua, vanadium and nickel compounds are the most abundant organometallic constituents and cause major problems in hydrotreating of residuum oils. At hydroprocessing conditions, these metal compounds deposit on and deactivate the catalyst. Pore mouth plugging in the catalyst by the metal deposit has been known as the major cause in the catalystmore » deactivation. Tamm and co-workers studied two mechanisms of catalyst deactivation by petroleum feed metals: (1) poisoning of the active surface and (2) physical obstruction of the pore structure. Thus, two possible reasons for the severe deactivation observed in the Maya TLR are metal deposition and carbon laydown on the catalyst surface. Another reason why the Maya TLR had a stronger inhibiting effect than coal is that these reactions are at 350/sup 0/C, where the coal was only partially dissolved; therefore, all the bad actors from coal were not available in the system, while those from the resid were. 3 refs., 4 figs., 36 tabs.« less
Authors:
; ;
Publication Date:
OSTI Identifier:
6141465
Report Number(s):
DOE/PC/80502-T6
ON: DE87013440
DOE Contract Number:
FG22-85PC80502
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products
Research Org:
Auburn Univ., AL (USA). Dept. of Chemical Engineering
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; CATALYSTS; DEACTIVATION; HYDROGENATION; STRUCTURAL MODELS; CATALYTIC EFFECTS; COAL; DENITRIFICATION; DESULFURIZATION; HETEROCYCLIC COMPOUNDS; MOLYBDENUM; NAPHTHALENE; NICKEL; PETROLEUM RESIDUES; PHENOL; PROCESSING; QUINOLINES; REMOVAL; THIONAPHTHENES; AROMATICS; AZAARENES; AZINES; CARBONACEOUS MATERIALS; CHEMICAL REACTIONS; CONDENSED AROMATICS; ELEMENTS; ENERGY SOURCES; FOSSIL FUELS; FUELS; HYDROCARBONS; HYDROXY COMPOUNDS; MATERIALS; METALS; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; ORGANIC SULFUR COMPOUNDS; PETROLEUM; PETROLEUM FRACTIONS; PHENOLS; PYRIDINES; TRANSITION ELEMENTS 010405* -- Coal, Lignite, & Peat-- Hydrogenation & Liquefaction