TH41449A - Preparation of a very pure hydroxylamine acidosis solution. - Google Patents

Abstract

DC60 (25/02/43) A very pure solution of free hydroxylamine was prepared by a process in which a diluted aqueous hydroxylamine solution was concentrated in a column by removing the hydroxylamine vapor through a side outlet at the bottom of the column. Very pure hydroxylamine was then obtained by condensing that vapor. This novel process is simple and gentle, and industrially viable, yielding electronic grade hydroxylamine. A very pure solution of free hydroxylamine was prepared by a process in which a diluted aqueous hydroxylamine solution was concentrated in a column by removing the hydroxylamine vapor through a side outlet at the bottom of the column. Very pure hydroxylamine was then obtained by condensing that vapor. This novel process is simple and gentle, and industrially viable, yielding electronic grade hydroxylamine.

Claims (6)

1. The process of preparing a very pure hydroxylamine aqueous solution involves concentrating and purifying the hydroxylamine aqueous solution. Concentration is performed in a column; the hydroxylamine vapor is removed through a side channel at the bottom of the column, and very pure hydroxylamine is obtained by condensing the vapor. 2. The process described in Requisition 1, in which the hydroxylamine solution to be concentrated and purified is obtained by a) treatment of the hydroxylammonium salt with a suitable base in water, and b) separation of the resulting solution, if necessary, after removal of insoluble components, to obtain the hydroxylamine aqueous fraction and the salt fraction by treatment with water or steam at least 80µm. 3. The process described in claims 1 or 2, in which the condensation of a very pure hydroxylamine solution is achieved by adding hydroxylamine vapor, which has been removed from the side outlets, into the area below the condenser and above the evaporator, and then partially evaporating the condensed hydroxylamine solution in the condenser in the evaporator, yields a much purer and more concentrated hydroxylamine solution. 4. The process described in claim 1 or 2, where the hydroxylamine vapor removed through the side outlet at the bottom of the column, is passed into the side column, yielding a highly purified hydroxylamine solution at the bottom of the side column. 5. A process as described in one of the preceding claims, where the side outlet is connected to the gas side of the column for concentration. 6. The process described in one of the preceding claims, in which a metal-free and hydroxylamine-resistant material is used as a side-out plant component. (6 claims, 1 page, 3 figures)