US Patent 7973090 Process for production of zeolite film

Patent 7973090 was granted and assigned to NGK Insulators on July, 2011 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

NGK Insulators

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7973090

Date of Patent

July 5, 2011

Patent Application Number

12118911

Date Filed

May 12, 2008

Patent Primary Examiner

‌

Michael M. Bernshteyn

Patent abstract

A process for producing a zeolite membrane comprising a seed crystal forming step of placing, in a pressure-resistant vessel, a seeding sol containing silica, water and a structure-directing agent and a support in a state that the support is immersed in the seeding sol and heating the heat-resistant vessel to form a zeolite seed crystal on the surface of the support, and a membrane formation step of allowing the zeolite seed crystal to grow to form a zeolite membrane on the surface of the support. In the seed crystal forming step, the molar ratio of water/silica in the seeding sol is set 10 to 50 and the heating of the pressure-resistant vessel is conducted at 90 to 130° C. The crystal c-axis of the present zeolite membrane is oriented in a direction vertical to the surface of the support and its thickness is uniform.