Composition for steam extraction of bitumen
AssigneeDow Global Technologies LLC
InventorsCole A. Witham, Yuko Kida, Biplab Mukherjee, Timothy J. Young, Christopher W. Nelson
Life of this patent
Estimating the term…
Abstract
The present invention relates to a bitumen recovery process from oil sands. The oil sands may be surface mined and transported to a treatment area or may be treated directly by means of an in situ process of oil sand deposits that are located too deep for strip mining. Specifically, the present invention involves the step of treating oil sands with a composition comprising an alkanolamine and an ethylene oxide capped glycol ether and/or propylene oxide capped glycol ether.
Claims10
A method to recover bitumen comprising the step of contacting oil sands with a composition consisting essentially of an alkanolamine and a glycol ether wherein the alkanolamine/glycol ether composition comprises:
- (i) an alkanolamine described by the following structure:
- R1R2N—R3OH
- where R1 is H, or a linear, branched, or cyclic alkyl group of 1 to 4 carbons, R2 is H, —CH2CH2OH, or a linear, branched, or cyclic alkyl group of 1 to 4 carbons,
- and
- R3 is a linear or branched alkyl group of 2 to 5 carbons
- and
- (ii) one or more glycol ether selected from:
- (a) an ethylene oxide capped glycol ether described by the following structure:
- RO—(CH2CH(CH3)O)m(C2H4O)nH
- wherein R is a linear, branched, cyclic alkyl, phenyl, or alkyl phenyl group of equal to or greater than 4 carbons,
- m is 0 to 3,
- and
- n is 1 to 3,
- and
- (b) a propylene oxide capped glycol ether described by the following structure:
- RO—(C2H4O)o(CH2CH(CH3)O)pH
- wherein R is a linear, branched, cyclic alkyl, phenyl, or alkyl phenyl group of equal to or greater than 4 carbons,
- o is 0 to 3,
- and
- p is 1 to 3,
- wherein the treatment is to oil sands recovered by surface mining or in situ production and the ratio of alkanolamine (i) to ethylene oxide capped glycol ether and/or propylene oxide capped glycol ether (ii) is from 25:75 to 75:25.
Dependencies are inferred from the claim text.