Process for producing high purity solutions of alkali metal hydr

Details Process for producing high purity solutions of alkali metal hydr Process for producing high purity solutions of alkali metal hydr

1985-02-21

1986-05-20

Doll, John

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

2521882, 23296, C01B 1766

Patent

active

045900582

ABSTRACT:
High purity solutions of alkali metal hydrosulfites having low concentrations of alkali metal thiosulfates are produced in a process which comprises feeding an alcohol-free aqueous solution of an alkali metal hydrosulfite containing an alkali metal thiosulfate as an impurity to a crystallizing zone. Produced in the crystallizing zone is a slurry of alkali metal hydrosulfite crystals which is conveyed from the crystallizing zone to a separating zone. The separating zone, employing a non-gravitational separation means, recovers a slurry of alkali metal hydrosulfite crystals from a first mother liquor. A portion of the slurry of alkali metal hydrosulfite crystals is conveyed to a concentrating zone to recover a cake of alkali metal hydrosulfite crystals from a second mother liquor. The cake of alkali metal hydrosulfite hydrate crystals is admixed with water in a dissolving zone to produce a purified solution of an alkali metal hydrosulfite having reduced concentrations of said alkali metal thiosulfate as an impurity.
The process is operated to minimize the residence time of alkali metal hydrosulfite containing mother liquors in the crystallizing zone and prevent significant decomposition of the crystals of alkali metal hydrosulfite.

REFERENCES:
patent: 2938771 (1960-05-01), Avedikian
patent: 3298796 (1967-01-01), Van Damme-Van Weele et al.
patent: 3804944 (1974-04-01), Kise et al.
patent: 3839218 (1974-10-01), Owen et al.
patent: 3887695 (1975-06-01), Plentovich et al.
patent: 3961034 (1976-06-01), Bostian et al.
patent: 4042674 (1977-08-01), Yamamoto et al.
patent: 4076795 (1978-02-01), Tiethof
patent: 4100098 (1978-07-01), Magan
patent: 4126716 (1978-11-01), Yamamoto et al.
patent: 4283303 (1981-08-01), Ellis
patent: 4357256 (1982-11-01), Yamaguchi
patent: 4388291 (1983-06-01), Arakawa
patent: 4534954 (1985-08-01), Little et al.

Affiliated with

Also associated with

Rating

Process for producing high purity solutions of alkali metal hydr does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for producing high purity solutions of alkali metal hydr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing high purity solutions of alkali metal hydr will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2107964