The Dow Chemical Company

Oronzio Denora Impianti Elettrochimici S.p.a.

James W. Mcmichael

Richard N. Beaver

Carl E. Byrd

Harry S., Jr. Burney

Richard N Beaver

Hiep D Dang

Gregory J Morris

John R Pimlott

Sandor Grosshandler

Carl E Byrd

Stephen L Kelly

Mark J Hazelrigg

Donald D Waters

Charles W Becker

Frank W Spillers

Kenneth R Evans

Lloyd E Alexander

Robert D Spradling

Harry S Burney, Jr

H Gene Newton

Giuseppe Noli

James W Mcmichael

Jr Burney Harry S

Cathodes useful in electrolytic cells, such as a chlor-alkali cell, are disclosed which have a metallic-surfaced substrate coated with an electrocatalytic coating. The electrocatalytic coating includes palladium and at least one primary electrocatalytic metal, such as a platinum group metal. The coating optionally includes at least one secondary electrocatalytic metal, such as nickel, cobalt, iron, copper, manganese, molybdenum, cadmium, chromium, tin and silicon. Also disclosed is non-electrolytic reduction method for preparing the cathodes. The method provides a tightly adherent coating, improves electrocatalyst loading and reduces cathode production costs.

Electrocatalytic cathodes and method of preparation

Cathodes useful in electrolytic cells, such as a chlor-alkali cell, are disclosed which have a metallic-surfaced substrate coated with an electrocatalytic coating. The electrocatalytic coating includes palladium and at least one primary electrocatlaytic metal, such as a platinum group metal. The coating optionally includes at least one secondary electrocatalytic metal, such as nickel, cobalt, iron, copper, manganese, molybdenum, cadmium, chromium, tin and silicon. Also disclosed is a non-electrolytic reduction method for preparing the cathodes. The method provides a tightly adherent coating, improves electrocatalyst loading and reduces cathode production costs.

Cathodes useful in an electrolytic cell, such as a chlor-alkali cell, are disclosed which have a metallic-surfaced substrate coated with a catalytic coating composition. In one aspect, the catalytic coating includes a base layer of at least one primary electrocatalytic metal with particles of at least one electrocatalytic metal oxide entrapped therein. In another aspect, at least one upper oxide layer is formed on the base layer. Each upper oxide layer includes a substantially heterogeneous mixture of at least one primary electrocatalytic metal oxide and at least one secondary electrocatalytic metal oxide. The catalytic coatings are tightly adherent to the underlying substrate, resist loss during cell operation and exhibit low hydrogen overvoltage potentials. Also disclosed are methods for preparing the cathodes.

Electrocatalytic cathodes and methods of preparation

A membrane unit for use in an electrolytic cell comprising a combination of a membrane material and a reinforcing material around only the gasket-bearing surface of the membrane material. Damage to the gasket bearing surface of the membrane structure is minimized when the membrane unit is employed in, for example, electrolytic cells of the filter press-type.

Membrane unit for electrolytic cell

A membrane unit for use in an electrolytic cell comprising a combination of a first layer of membrane material and a second layer including a sealing material and a metallic insert around only the gasket-bearing surface of the membrane material. Damage to the gasket-bearing surface of the membrane structure is minimized when the membrane unit is employed in, for example, electrolytic cells of the filter press-type.

The invention is a method for preparing electrocatalytic oxides and applying them to substrates that cannot be heated to temperatures sufficiently high to convert electrocatalytic salts into electrocatalytic oxide comprising:

Process for preparation of an electrocatalyst

The invention is a dampening device for use in a vertically disposed electrochemical cell unit of the type at least having: (a) a peripheral flange which defines at least one electrode chamber, said peripheral flange having a upper, substantially horizontally disposed flange portion, a lower substantially horizontally disposed flange portion, and two disposed side flange portions; and (b) at least one outlet port passing through the upper horizontally disposed flange portion or through one of the two vertical side flange portions or through the lower flange portion and connecting the exterior of the cell with the electrode chamber. The dampening device is an elongated, hollow duct positioned across at least a portion of the top of the electrode chamber adjacent to the upper, horizontally disposed flange portion, said duct being in fluid flow communication with said electrode chamber and with said outlet port(s), wherein the duct has at least one opening near its top which connects the interior of the duct with the electrode chamber, wherein said opening(s) has a total cross sectional area less than or equal to the greatest internal cross sectional area of the duct. The invention includes an electrochemical cell containing the dampening device.

Antisurge outlet apparatus for use in electrolytic cells

An alkali metal salt solution is electrolyzed in an electrolytic cell with at least two electrode compartments adapted to being separated by a membrane. At least one electrode compartment contains at least one means defining a space adapted to receive a portion of membrane surface during operation of the cell. By maintaining the pressure higher in one electrode compartment than the other the membrane portion is pushed toward and into the membrane receiving space such that any wrinkles formed on the membrane are removed.

Electrolytic cell and method of operation

Method for forming a titanium lined electrochemical cell

A flat plate bipolar electrolytic cell frame unit has a plurality of connectors removably attachable to the centerboard. Anode and cathode plate supports or ribs have outer plate supporting edges and are cooperable with the connectors, when the latter are secured to the centerboard, to enable adjustment of the ribs to preselected positions whereat their edges define preselected planes, such that when the anode and cathode plates are subsequently welded to said edges and assembled with the connectors to the centerboard, the anode and cathode plates of adjacent bipolar cell units are parallel and closely spaced by a predetermined distance. The connectors are removably secured to the centerboard and the ribs are welded at their adjusted positions to their respective connectors. Thereafter the welded together connectors and ribs are removed from the centerboard to enable unencumbered welding of the anode and cathode plates to said edges of the anode and cathode ribs respectively. The connectors, with the ribs welded thereto and with the anode and cathode plates welded to their respective anode and cathode ribs, are then reassembled to the centerboard.

Flat plate bipolar cell

The invention is an electrochemical article suitable for use in monopolar or bipolar electrochemical cells comprising:

Plastic electrochemical cell terminal unit

The invention is an electrolytic unit comprised of a plurality of parts connected in a manner to form a substantially planar electrolytic unit comprising:

Fabricated electrochemical cell

The invention is a structural frame adapted for use in an electrochemical cell comprising:

Structural frame for an electrochemical cell

The invention is a method for making an electrolytic unit having

Method for making an electrolytic unit from a plastic material

An electrochemical cell structure frame and cell utilizing same comprising an organic plastic member having electrically conductive inserts extending through annular shoulders on respective coplanar surfaces of the plastic member. Electrically conductive, hydraulically impermeable anolyte and catholyte resistant covers matingly contact each respective coplanar surface of the plastic member. An electrically conductive, hydraulically permeable current collector is positioned substantially coplanar with and contacts at least a portion of one of the covers. An electrically conductive, hydraulically permeable, resilient mattress is positioned substantially coplanar with and contacts at least a portion of a side of the current collector opposite the side of the current collector which contacts the cover. A catalytically active electrode is positioned substantially coplanar with and contacts at least a portion of a side of the mattress opposite the side of the mattress which contacts the current collector.

Growing community of inventors

Angleton, TX, United States of America

Richard N Beaver