An apparatus and method to separate a mixture of gases--such as carbon dioxide and methane--by an inorganic membrane comprising a ceramic support and a silica layer made from a silicon elastomer sol. The apparatus and method can efficiently separate the gaseous mixture and can also cope with the extreme conditions found in e.g. hydrocarbon producing wells. A method of manufacturing the apparatus is also disclosed.

 
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> Use of polyacrylic acids as grinding aids for calcium carbonate

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