279results about How to "Reduced Quantity Requirements" patented technology

A method is provided for forming zeolite membranes in internal surfaces of a plurality of conduits in a cylindrical porous ceramic monolith, the conduits extending from one end of the monolith to theother, said method including a step of: flowing a pre-treatment liquid including a zeolite initiating agent into the conduits; causing at least part of a carrier liquid component of the treatment liquid to flow from the conduits into and through the body of the monolith to the exterior;andcausing zeolite crystals to be deposited in the porous internal surfaces of the conduits as the carrier liquidcomponent flows into the monolith. The substrates may be pre-conditioned for membrane formation by a method which comprises: (a) forming an aqueous suspension ofzeolite particles; and (b) passing thesuspension alternately(i)through the tubular conduits and(ii)out through the walls of the tubular conduits so as to deposit a layer of zeolite particles on the inner surfaces ofthe tubular conduits;wherein the porous substrates are treated in chambers arranged e.g in annularly and the suspension is supplied to the chambers from a first common manifold via respective delivery tubes and is recovered via recovery tubes leading to a second common manifold, the first and second manifolds and the supply and recovery tubes being configured so that the branch path to and from each chamber is substantially the same. After pre-conditioning, formation of membranes may be by depositing or crystallizingazeolite membrane on the zeolite particles by gel crystallization.A membrane structureis also provided which comprisesa tubular porous ceramic monolith having tubular conduitseach having an internal diameter of (5) to (9) mmformed within the monolithwitha zeolite membrane formed on the internal surface ofeach of theconduits, wherein either there are four conduits and the monolith is longer than 600 mm or there are five or more conduits.