JPS6347484B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to membrane separation technology, and more particularly to improvements in a membrane separation module for precision oil separation.

An object of the present invention is to provide a membrane separation module that can automatically remove static electricity generated by friction between the membrane and oil during precision separation of oil.

Conventional oil precision filters use pre-coat filters,
This is done using sintered metal precision filters, cloth or fiber filters, etc. In these cases, the static electricity generated by the friction between the material and the oil was not very large, and there was no need to remove it.

In order to further increase the purity of the oil, the inventors have
We developed a microfilter hollow fiber with a sieve mesh size of 0.1μ, and when we were conducting experiments on filtering vegetable oil using it, we found that during seasons when the outside humidity is low, the material and It was discovered that static electricity was generated due to friction between the oil and the oil, posing a risk of fire.

As a means to remove this static electricity, put gold into the flow path, pull out the lead wire, and ground it. Ground the metal pipe. Put several wires outside the hollow fiber membrane bundle parallel to the hollow fibers, and pull out the lead wire. As a result of a comparative experiment of 4 methods of inserting a wire into several hollow fibers of a hollow fiber membrane bundle (for example, about 1100 membranes) and pulling out the lead wires and grounding, the following facts were revealed. It became. (The membrane module used here is detailed in Japanese Patent Application No. 57-58255.) This method has no static electricity removal effect at all. Similarly, this method has no static electricity removal effect at all. This method has a considerable effect on removing static electricity. This method is highly effective in removing static electricity. The reason for this large difference between This is thought to be because static electricity can be removed efficiently and effectively using a shaped body.

The method there will be explained in more detail. 1st
The figure is a drawing showing a module employing the method of and. In the figure, 1 is a hollow fiber membrane bundle, 2 is a housing, and 3 is an adhesive-cured tube plate which is bundled and bonded to the housing so as to keep the inside and outside of the hollow fiber membranes in a watertight state. 4 is the inlet for the overflow oil, 5
6 is an outlet for the non-permeate component, 6 is an outlet for permeate (permeate), and 7 is an inlet for pressurized gas introduced into the housing to extract the permeate. 8 is a conductive filament of the present invention (for example, a stainless steel wire of about 0.3 mmφ), and 9 is a lead wire drawn out from 8.

FIG. 2 is a sectional view of the plane A in FIG. 1. Second
In the figure, 8 is a conductive filament, a is for one conductive filament, b is for three conductive filaments, c and d are for four, and e is for five conductive filaments. An example of each arrangement is shown.

FIG. 3 is an enlarged view of a portion of the plane A in FIG. In FIG. 3, 11 is a hollow fiber membrane, and 12 is a conductive filament.

The static elimination effect is greater when the conductive filaments are present from one end of the hollow fiber bundle to the other. The effect will not increase even if the number is more than a few.

From the above explanation, the constituent elements necessary for the present invention can be summarized as follows.

In other words, in a membrane separation module in which hollow fiber membranes are bundled, a conductive filament is placed in the hollow part of the hollow fiber membrane, and the oil filter membrane is wired so that the static electricity that accumulates inside the module during over-operation can be removed to the outside. It is a separate module.

Oil includes all liquids with high electrical resistance, such as vegetable oils, animal oils, mineral oils, organic solvents, and organic liquids. Membrane separation means ultrafiltration, microfilter,
The shape of the membrane is hollow fiber. The conductive filament may be any filament that is conductive to static electricity, such as metal wire or carbon fiber.

[Brief explanation of the drawing]

FIG. 1 shows one embodiment of the present invention. 1 is a hollow fiber membrane bundle, 2 is a housing, 3 is a hollow fiber bundle adhesive tube plate, 4 is an inlet for permeated oil, 5 is an outlet for non-permeable components, 6 is an outlet for permeated oil, and 7 is an outlet for permeated liquid. This is an inlet for pressurized gas introduced into the housing for extraction. 8 is a conductive linear body of the present invention, and 9 is a lead wire. FIGS. 2a, b, c, d, and e are diagrams showing examples of the arrangement of conductive filaments on the side A of FIG. 1. FIG. 3 is an enlarged view of a portion of the plane A in FIG.

Claims (1)

[Claims] 1. In a membrane separation module in which hollow fiber membranes are bundled, a conductive filament is placed in the hollow part of the hollow fiber membrane, and static electricity accumulated inside the module during filtration operation can be removed to the outside of the module. A membrane separation module for oil filtration characterized by wiring as follows. 2. The membrane separation module for oil filtering according to claim 1, wherein the conductive filament is a metal wire, and the number thereof is one to several.