Method of producing crystalline ammonium metatungstate

Details Method of producing crystalline ammonium metatungstate Method of producing crystalline ammonium metatungstate

C - Chemistry, Metallurgy

01

G

23/251

C01G 41/00 (2006.01)

Patent

CA 1238473

ABSTRACT A method is disclosed for producing crystalline ammonium metatungstate from ammonium paratungstate. The method involves heating the ammonium paratungstate at from about 100°C to about 250°C for from about 1 hour to about 8 hours to remove some ammonia and water, digesting a solution of the heated ammonium paratungstate in water at from about 80°C to about 100°C for from about 2 hours to about 6 hours at relatively constant volume while maintaining the pH of the slurry at from about 4.2 to about 3.0 by addition of ammonia as necessary to form a solution of ammonium metatungstate in water. The ammonium metatungstate solution is then evaporated to concentrate it. Any insoluble material is separated from the solution. Ammonium metatungstate is then crystallized from the resulting concentrated ammonium metatungstate solution. - 12 -

502231

Affiliated with

Also associated with

Rating

Method of producing crystalline ammonium metatungstate 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 of producing crystalline ammonium metatungstate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of producing crystalline ammonium metatungstate will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1255718