Sachem, Inc.

Christopher D Shay

Hossein Sharifian

In one embodiment, the present invention provides a method of preparing hydroxylamine from a hydroxylammonium salt solution, including providing an electrochemical cell containing an anode, a cathode, a cation selective membrane and an anion selective membrane, wherein the cation selective membrane is positioned between the cathode and the anion selective membrane, and the anion selective membrane is positioned between the cation selective membrane and the anode, thereby defining a feed compartment between the cation selective membrane and the anion selective membrane, a recovery compartment between the cathode and the cation selective membrane, and an acid compartment between the anion selective membrane and the anode; charging a first solution to the acid compartment and a second solution the recovery compartment; charging the hydroxylammonium salt solution to the feed compartment; passing a current through the cell to produce hydroxylamine in the recovery compartment; and recovering hydroxylamine from the recovery compartment.

Methods of purifying hydroxylamine solutions and converting

The present invention provides a method of purifying a hydroxylamine solution containing impurities, including contacting the hydroxylamine solution with a semipermeable membrane under pressure so that at least a portion of the hydroxylamine solution passes through the membrane; and recovering the portion of the hydroxylamine solution which passed through the membrane.

Methods of purifying hydroxlamine solutions and separating hydroxylamine

A process is described for preparing onium hydroxides from the respective onium salts and for purifying onium hydroxides in an electrochemical cell. In one example, the present invention relates to a process for preparing onium hydroxides from the corresponding onium salts which comprises the steps of: (A) providing a cell comprising an anode, a cathode and one or more unit cells assembled for operational positioning between the anode and the cathode, each unit cell comprising: (A-1) four compartments defined by, in sequence beginning at the anode, a bipolar membrane, a first divider and a second divider, said bipolar membrane having an anion selective side facing the anode and a cation selective side facing the cathode.

Preparation of onium hydroxides in an electrochemical cell

The present invention relates to a method of preparing hydroxylamine in an electrochemical cell, comprising the steps of: providing an electrochemical cell comprising an anode, a cathode, a bipolar membrane positioned between the anode and the cathode, the bipolar membrane having an anion selective side facing the anode and a cation selective side facing the cathode, and a divider positioned between the bipolar membrane and the anode, thereby defining a feed compartment on the cation selective side of the bipolar membrane, a recovery compartment on the anion selective side of the bipolar membrane, and an anolyte compartment between the divider and the anode; charging the feed compartment with an acidic electrolyte and the recovery and anolyte compartments with a solution; introducing nitrogen containing gas into the feed compartment; passing a current through the electrochemical cell thereby producing hydroxylammonium salt in the feed compartment; transferring at least a portion of the hydroxylammonium salt from the feed compartment to the recovery compartment thereby producing hydroxylamine in the recovery compartment; and recovering hydroxylamine from the recovery compartment.

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Stillwater, OK, United States of America

Christopher D Shay