JPS58156173A - Method of separating air - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air separation method in which a desired gas is efficiently recovered by supplying the air to be separated by a deep cooling method with the ratio of the component composition determined in advance. Argon is used in a wide range of exports as a gas for the Qin Dynasty.

Most of these gases are produced by air separation equipment using cryogenic separation using air as a raw material. This If
When performing layer separation using the i' II & fractionation method, the magnetic ratio of oxygen, g element, and argon that can be produced is determined by the volume ratio of oxygen, j element, and argon contained in the raw material air, In other words, it is naturally limited by 21Near 8:l. However, the demand for oxygen, hydrogen, and argon rarely matches the amount of gas produced, and it is not always possible to produce enough to meet **. for example.

I want to produce argon, but oxygen, l! Even if you don't want to produce argon, it is impossible to produce only argon. Therefore, in the past, the amount of air in the raw material was increased to separate and collect the required amount of argon and oxygen.

I produced Sukso in vain.

This invention proposes an air separation method for eliminating such waste in production and recovering gas with a low content ratio of ML, argon, etc. with a high conversion rate.

That is, this invention is based on *a method for separating component gases in the air, such as oxygen, argon, etc.
A permeation device with a polymer membrane is installed on the inlet side of the cold air separation device, and air with a highly balanced composition is passed through this permeation device. The gist of this paper is an air separation method for supplying cold air to a JIS device.

It is well known that gases can be separated by passing a mixed gas through a monomolecular membrane, but in this invention, by passing air through a polymer, the component composition can be changed to increase the concentration of the desired component gas. It is characterized by supplying air with a different ratio as a raw material to a cryogenic air separation device and separating it.

Polymer membranes include silicone rubber, polycarbonate,
Many materials are known, including natural rubber, polystyrene, polyethylene, and polyvinyl fluoride.

For oxygen production, a polymer membrane for W1 element enrichment is selected, for 11 element production a polymer membrane for F11 element enrichment, and for argon production, a polymer membrane for argon enrichment is selected and used. .

J: As mentioned above, by applying a polymer membrane suitable for the gas to be produced, the air components can be reduced to 15 to 40% oxygen by volume.
%, g@85-60%, argon 0.5-3 whispers.

The raw air stream enriched with the desired gas content through a polymer membrane is supplied to a commonly used cryogenic air separation device, where it is separated and the desired gas is recovered. An example will be described based on the drawings.

Figure 1 shows an apparatus for carrying out this invention, in which a permeation device (2) having a polymer membrane (1) and a deep-chilled air separation device (4) are connected via a compressor (3). When air is introduced from the supply port (5) of the permeation device (2), it permeates through the polymer membrane (1), and the air, whose ratio of component IIA has been changed, is sufficiently compressed by the compression unit (3). It is sent to a cryogenic air separation device (4), where it is separated into oxygen, nitrogen, and argon gases, and the required gases are recovered.

In addition, I%S! All non-permeable molecules that have passed through the monomolecular membrane (1) are discharged from the discharge port (6).

Although the above compressor 11 (3) is installed just before the inlet side of the cryogenic air separation device (4), it may also be installed at the inlet side of the permeation device (2), or it can be connected to the deep permeation device (2). Cold air separation equipment (
4) may be provided on each entrance side.

Next, as a specific example of this method, a case where # element is manufactured will be described.

Air is passed through a permeation device using a silicone-based composite membrane under the following conditions, and the oxygen-enriched raw air is compressed and cooled for $11.
1! The oxygen was separated and recovered.

(1), Silicon-based composite membrane pus Thickness: 0.1 μm (Unit: d-cs/-Lu-C Hg) Oxygen (DIE per cent lk: 3.0-6.0xlO
-"Transmission coefficient of bulk: 1.8~3.5 X I G-'
(1) Raw material air feed rate: 1 4 Q vd/ml output @:
S/ctsG (■) Product oxygen recovery amount: 50 rrt/Win Table F shows the composition of the air that is pumped after the RS filter at this time.

In addition, the electric power consumption per 1 m' of oxygen is 0.45 KWh using the conventional method that does not have an XS filter.

According to the implementation of the present invention, 0.41KWh is achieved, 004
KWh is advantageous.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of an apparatus for carrying out the present invention. Applicant Kyodo Sanso Co., Ltd.

Claims (1)

[Claims] In a method of separating component gases in air such as oxygen, argon, etc. by cryogenic cooling, a permeation device with a polymer membrane is installed on the tR chilled air component 11 placement side, and the components are passed through this S-device. Deep cooling 2J of air with different composition ratio! An air separation method characterized by supplying air to a gas separation device.