Zero discharge process for manufacturing of phosphorous acid and

Details Zero discharge process for manufacturing of phosphorous acid and Zero discharge process for manufacturing of phosphorous acid and

1991-06-07

1994-11-29

Lewis, Michael

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423317, C01B 25165, C01B 25163

Patent

active

053688325

ABSTRACT:
Disclosed is a method of making phosphorous acid or hypophosphorous acid by reacting hydrogen chloride with a sodium phosphite or a sodium hypophosphite, respectively, in the presence of water to precipitate sodium chloride crystals and form the acid. The acid is separated from the sodium chloride crystals and can be passed through an anion exchange column that is preferably loaded with phosphite or hypophosphite ions, respectively, to remove residual chloride ions.

REFERENCES:
patent: 2595198 (1952-04-01), Leffore et al.
patent: 2711388 (1955-06-01), Mottern et al.
patent: 4248846 (1981-02-01), Hill
patent: 4278647 (1981-07-01), Jodden et al.
patent: 4330515 (1982-05-01), Campbell
patent: 4380531 (1983-04-01), Wisnouskas

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