Purification of ammonia

Details Purification of ammonia Purification of ammonia

2005-11-29

2005-11-29

Cintins, Ivars C. (Department: 1724)

Liquid purification or separation

Processes

Ion exchange or selective sorption

C210S669000, C210S681000, C210S683000, C210S684000, C210S685000, C210S687000, C210S688000

Reexamination Certificate

active

06969466

ABSTRACT:
Highly pure aqueous solution of ammonia, typically electronics grade for use in semiconductor manufacturing is prepared by passing a solution of ammonia through at least one cation exchange resin bed to remove substantially all of the cation contaminants; subsequently passing the cation exchange resin effluent through at least one anion exchange resin; and recovering an aqueous solution of ammonia product substantially free of ionic contaminants.

REFERENCES:
patent: 2184943 (1939-12-01), Pattock et al.
patent: 4263145 (1981-04-01), Wirth, Jr.
patent: 5242468 (1993-09-01), Clark et al.
patent: 5496778 (1996-03-01), Hoffman et al.
patent: 5746993 (1998-05-01), Mullee
patent: 6001223 (1999-12-01), Hoffman et al.
patent: 6183720 (2001-02-01), Laederich et al.

Affiliated with

Also associated with

Rating

Purification of ammonia does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Purification of ammonia, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Purification of ammonia will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3457203