Diaphragm of predefined porosity and method of manufacturing

Patent metadata

Field	Value
Publication number	US-9663866-B2
Application number	US-201213486089-A
Country	US
Kind code	B2
Filing date	Jun 1, 2012
Priority date	Dec 3, 2009
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

The invention relates to a cathode for electrolytic processes provided with a catalytic coating based on ruthenium crystallites with highly controlled size falling in a range of 1-10 nm. The coating can be produced by physical vapor deposition of a ruthenium or ruthenium oxide layer.

First claim

What we claim is:

1. Method of deposition of a porous separator on a cathode body of a diaphragm electrolytic cell, comprising:
immersing the cathode body into a deposition vessel containing a suspension comprising polymer fibers and an optional particulate material;
detecting a suspension level of the suspension in the deposition vessel using a level sensor;
detecting a vacuum level in the deposition vessel;
vacuum sucking the suspension containing polymer fibers and the optional particulate material through the cathode body by continuously adjusting the degree of vacuum applied as a function of the weight % of deposited fiber with respect to a predetermined total amount of deposited fiber wherein the weight % is calculated from a variation of the suspension level detected from the level sensor;
obtaining a predetermined porous separator profile on the cathode body at the end of the deposition,
wherein the obtained porous separator comprises a superposition of a multiplicity of polymer fiber planes comprising primary pores generated by the interconnection of a multiplicity of primary interstices between the fibers, the primary pores having an average value of about 2 to 10 microns.

2. The method according to claim 1 , wherein at the end of the deposition the method further comprises extracting the cathode body with the applied diaphragm and maintaining a degree of vacuum not lower than the degree of vacuum at the end of the deposition for a time of about 0.5 hours to about 3 hours.

3. The method according to claim 1 , wherein the degree of vacuum applied during the deposition reaches a maximum value of about 300 mm to about 650 mm Hg .

Assignees

• Meneghini Giovanni
• Mojana Corrado
• Prado Felix
• Industrie De Nora Spa

Inventors

• Meneghini Giovanni
• Mojana Corrado
• Prado Felix

Classifications

• C25B13/08

  based on organic materials · CPC title

• C25B13/00 Primary

  Diaphragms; Spacing elements · CPC title