Method for preparing high-purity ionic liquids

Details Method for preparing high-purity ionic liquids Method for preparing high-purity ionic liquids

2005-02-08

2005-02-08

Drodge, Joseph (Department: 1723)

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

C210S767000, C210S774000, C210S777000, C210S804000, C210S806000, C429S199000, C502S224000

Reexamination Certificate

active

06852229

ABSTRACT:
A method for preparing a high-purity ionic liquid having a pH value of 7 and an elemental analysis deviation of less than 0.5 wt % between a calculated elemental analysis and a found elemental analysis for each of carbon, hydrogen and nitrogen, wherein the method comprises forming a monophasic or biphasic mixture of an ionic liquid and an inert liquid. When the monophasic mixture is formed, it is filtered to yield a filtrate from which the high-purity ionic liquid is recovered. When the biphasic mixtures is formed, it is separated into an aqueous phase and ionic liquid phase, whereby the ionic liquid phase is filtered to yield a filtrate from which the high-purity ionic liquid is recovered. Furthermore, the present purification procedure can be used for the clean-up of a contaminated ionic liquid by extracting it into a polar extractant to form an extract containing the ionic liquid. Water traces are removed from the extract. Then, the extract is filtered and the high-purity ionic liquid is recovered from the filtered extract.

REFERENCES:
patent: 3338903 (1967-08-01), Harrison
patent: 4623479 (1986-11-01), Kucharska et al.
patent: 5053537 (1991-10-01), Gitzel et al.
patent: 5273840 (1993-12-01), Dominey
patent: 5349067 (1994-09-01), Nakano et al.
patent: 5378445 (1995-01-01), Salmon et al.
patent: 5399624 (1995-03-01), Glaser et al.
patent: 5705696 (1998-01-01), King, Jr.
patent: 5731101 (1998-03-01), Sherif et al.
patent: 5827602 (1998-10-01), Koch et al.
patent: 5856513 (1999-01-01), Ue et al.
patent: 5874638 (1999-02-01), Chauvin et al.
patent: 5892124 (1999-04-01), Olivier et al.
patent: 5965054 (1999-10-01), McEwen et al.
patent: 5993767 (1999-11-01), Willmann et al.
patent: 6103908 (2000-08-01), Bahrmann et al.
patent: 6169209 (2001-01-01), Harada et al.
patent: 6245918 (2001-06-01), Olivier et al.
patent: 6379634 (2002-04-01), Fields et al.
patent: 6552232 (2003-04-01), Mehnert et al.
patent: 6637737 (2003-10-01), Beecherl et al.
patent: 6774240 (2004-08-01), Seddon et al.
patent: 0882698 (1998-12-01), None
patent: 0924182 (1999-06-01), None
patent: 0748653 (2000-01-01), None
patent: 0776880 (2000-01-01), None
patent: 1074308 (2001-02-01), None
patent: 1106575 (2001-06-01), None
patent: WO 9916776 (1999-04-01), None

Affiliated with

Also associated with

Rating

Method for preparing high-purity ionic liquids does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for preparing high-purity ionic liquids, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for preparing high-purity ionic liquids will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3500098