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CAS indexed 41 chemical substances from this document.
CAS subject entries for this document include: Quaternary ammonium compounds, reactions; Separation; Mixtures; and 16 additional concepts. | |
CAPLUS COPYRIGHT 2004 ACS on STN
| TITLE:
| Method for preparing high-purity ionic liquids |
| INVENTOR(S):
| Mehnert, Christian P.; Dispenziere, Nicholas C.; Cook, Raymond A. |
| PATENT ASSIGNEE(S):
| USA |
| SOURCE:
| U.S. Pat. Appl. Publ., 11 pp. CODEN: USXXCO |
| LANGUAGE:
| English |
PATENT INFORMATION: PATENT NO. KIND DATE APPLICATION NO. DATE
--------------- ---- -------- --------------- --------
US 2004074842 A1 20040422 US 2002-277420 20021022
ABSTRACT:
A method for prepg. a high-purity ionic liq. having a pH value of 7 and an elemental anal. deviation of <0.5% between a calcd. elemental anal. and a found elemental anal. for each of carbon, hydrogen and nitrogen, wherein the method comprises forming a mono-phasic or biphasic mixt. of an ionic liq. and an inert liq. When the mono-phasic mixt. is formed, it is filtered to yield a filtrate from which the high-purity ionic liq. is recovered. When the biphasic mixts. is formed, it is sepd. into an aq. phase and ionic liq. phase, whereby the ionic liq. phase is filtered to yield a filtrate from which the high-purity ionic liq. is recovered. Also, the present purifn. procedure can be used for the clean-up of a contaminated ionic liq. by extg. it into a polar extractant to form an ext. contg. the ionic liq. Water traces are removed from the ext. Then, the ext. is filtered and the high-purity ionic liq. is recovered from the filtered ext.
Updated 5/8/2007 10:26:23 AM
