Mitsubishi Chemical Corporation

Pall Corporation

Takehito Mizuno

Hiroyuki Chida

Kiminori Sato

Hisayuki Kataoka

Atsushi Sakamoto

Kazuma Tsutsumi

Yumiko Katakura

Ryoki Sato

Systems and methods condition a filter assembly. Purging liquid is passed through the filter assembly to remove contaminants from the pores and voids of the filter medium and from the upstream and downstream sides of the filter medium.

Systems and methods for conditioning a filter assembly

A process for producing a zeolite separation membrane having a porous support containing alumina as a main component and, provided on a surface and within pores of the porous support, a zeolite layer, comprising the seed crystal adhering step of adhering USY zeolite crystal as a seed crystal on a surface and within pores of the porous support; the basis material forming step of bringing a reactant liquid containing silicon and aluminum into contact with the porous support and heating the reactant liquid to thereby obtain a zeolite separation membrane basis material; and the basis material separating step of separating the zeolite separation membrane basis material from the reactant liquid to thereby obtain a zeolite separation membrane. By this process for producing a zeolite separation membrane, there can be produced an FAU zeolite separation membrane capable of satisfactory separation of a mixture of organic solvent and water.

Process for producing zeolite separation membrane

The invention provides a process for production of a zeolite separation membrane having a porous support and a zeolite layer formed on the porous support, the process comprising: a seed crystal attaching step in which zeolite seed crystals are attached to the porous support; a layer forming step in which: the porous support to which the zeolite seed crystals have been attached is contacted with a reaction solution containing zeolite raw material, and the temperature of the reaction solution is raised to a prescribed temperature to form a zeolite layer on the porous support; and a support separating step in which the porous support on which the zeolite layer has been formed is separated from the reaction solution; wherein in the layer forming step, after the start of contact between the porous support and reaction solution, the temperature of the reaction solution is held at or below 40&#xb0; C. for at least 30 minutes before being raised to the prescribed temperature. The production process of the invention yields a zeolite separation membrane that can accomplish reliable and satisfactory separation of alcohol and water even when the water content relative to alcohol is low.

Zeolitic separation membrane and process for producing the same

The present invention provides a process for production of a zeolite separation membrane with satisfactory separation performance. The process for production of a zeolite separation membrane according to the invention is comprising: a seed crystal-attaching step in which: a sealed body (), which is obtained by sealing both ends of a cylindrical porous body () with sealing members (), is immersed from the sealing member () end into a suspension () containing zeolite seed crystals; the suspension () is allowed to permeate from the exterior of the porous body () to the interior thereof; the zeolite seed crystals are thereby attached to the porous body (); and a seed crystal-attached porous body is obtained; and a zeolite membrane-forming step in which: the seed crystal-attached porous body is contacted with a reaction solution containing the raw material of a zeolite membrane; the zeolite membrane is formed on the porous body (); and a zeolite separation membrane is obtained.

A process for manufacturing a zeolite membrane by hydrothermal synthesis on the surface of a porous tubular supportwith both ends open, by adding a reaction solution containing a silica source and an alumina source and the porous tubular supportinto a lengthwise reaction containerlonger than the porous tubular supportwhile placing the porous tubular supportvertically in the reaction containerand substantially apart from the inner surface of the reaction container, and immersing the porous tubular supportcompletely in the reaction solution so that the inside of the porous tubular supportis filled with the reaction solution; and heating the reaction solution under conditions of leaving the top and bottom ends of the porous tubular supportopen, and an apparatus using thereof and zeolite tubular separation membranes thus obtained.

Growing community of inventors

Tokyo, Japan

Takehito Mizuno