Analytical cleavage of diaryl ethers as models for asphaltene and preasphaltene structures

Conference · Fri Jan 01 04:00:00 EST 1982 · Prepr. Pap. - Am. Chem. Soc., Div. Fuel Chem.; (United States)

OSTI ID:6821896

Woolsey, N F; Blatisberger, R J; Bartak, D; Stenberg, V I; Patel, K M; Patil, D; Mukaida, K; Bolton, G

Structural studies of asphaltenes and preasphaltenes have indicated that the major functionality of oxygen as deduced from these studies was phenolic hydroxyl and aryl ether groups. Determination that the ether oxygen varied between apshaltenes and preasphaltenes but that the hydroxyl contents are similar has triggered studies of the ether cleavage reactions in coal materials or on coal model compounds. The ether cleavage has been studied with Na and K using hexamethylphosphoric triamide (HMPA) as electron transfer agent in tetrahydrofuran (THF) or 1,2-dimethoxyethane (DME) as a solvent; but after reaction, from 0 to 50% ether oxygen remained and a survey of likely ether structural types present which might prevent ether cleavage indicated two types, polycyclic aryl ethers and anionic ethers. Some preliminary studies were carried out on cleavage of these two types of ethers, and results indicated that directly measuring the amount of different aryl ether types in coal derived materials is a possibility, but reductive oligomerization, Birch reduction and an incomplete knowledge of all the ether types present in coal materials remain as problems. (BLM)

• Research Organization: Univ. of North Dakota, Grand Forks
• DOE Contract Number: FG22-80PC30227; AB18-78FC02101
• OSTI ID: 6821896
• Report Number(s): CONF-820909-Vol.3
• Conference Information: Journal Name: Prepr. Pap. - Am. Chem. Soc., Div. Fuel Chem.; (United States) Journal Volume: 27:3-4
• Country of Publication: United States
• Language: English

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