Process for manufacture of ultra-high purity ammonium hydroxide

Details Process for manufacture of ultra-high purity ammonium hydroxide Process for manufacture of ultra-high purity ammonium hydroxide

1996-10-17

1998-05-05

Langel, Wayne

Chemistry of inorganic compounds

Nitrogen or compound thereof

Ammonia or ammonium hydroxide

C01C 100

Patent

active

057469938

ABSTRACT:
A process for obtaining an ultra-high purity aqueous ammonium hydroxide solution according to the invention includes the steps of reacting highly pure, typically electronics grade, ammonia (NH.sub.3) with ultrapure water (upw) under conditions effective to produce an ultra-high purity stream of aqueous ammonium hydroxide (NH.sub.4 OH) which is available for immediate use in a wide variety of applications especially those requiring high purity aqueous solutions of ammonium hydroxide.

REFERENCES:
patent: 2701182 (1955-02-01), Sellers et al.
patent: 4291006 (1981-09-01), Pagani et al.
patent: 4572769 (1986-02-01), Shimizu
patent: 4634509 (1987-01-01), Shimizu et al.
patent: 4841998 (1989-06-01), Bruya
patent: 5114694 (1992-05-01), Grotz, Jr.
patent: 5393386 (1995-02-01), Aoyama et al.
"Tetrafluoroethylene Copolymers With Perfluorovinyl Ethers"; Kirk -Othmer Encyclopedia of Chemical Technology pp. 42-49 (1968).
"Ammines"; Kirk -Othmer Encyclopedia of Chemical Technology pp. 92-94 (1968).

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