JPH06708Y2 - Teflon flexible hose for liquid halogen - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a hose made of Teflon having flexibility required for receiving and discharging liquid halogen.

More specifically, it relates to a hose having good durability.

Halogen is an industrially important product or synthetic intermediate.

[Problems to be solved by conventional techniques and devices]

Liquid halogen is widely used in various fields in the chemical industry. The liquid halogen is received and discharged by high-pressure pipes that have corrosion resistance to halogen, but when the fixed pipe cannot receive and discharge, a pressure resistant flexible hose made of Teflon is usually used as a joint. .

This pressure-resistant flexible hose has a thin copper wire wound around the outside of the Teflon hose, and the surface thereof is covered with a stainless steel reinforcing wire mesh in order to have pressure resistance.

Since the temperature of the liquid halogen to be sent is generally lower than the ambient temperature when the liquid halogen is received or discharged, the temperature of the Teflon flexible hose is lowered.

Therefore, moisture in the air usually condenses on the metal surface of the reinforcing wire mesh of the flexible hose.

A small amount of halogen gas penetrates into Teflon and diffuses to the outside. The diffused halogen dissolves in condensed water to form a hydrogen halide compound, which corrodes the stainless wire mesh covering the hose. As a result, the durability of the hose is short, the hose needs to be replaced every two months, and the hose is expensive, which is an economical problem.

[Means for Solving the Problems]

The inventors of the present invention, as a result of earnest studies on solving the problem, have proposed that the outer side of a pressure-resistant flexible hose is further covered with a hose to form a double pipe, and the dehumidified gas is fed into the double pipe portion. The inventors have found that it is possible to prevent the formation of hydrogen halide compounds due to the permeated halogen and water, and prolong the durability of the pressure-resistant hose, and completed the present invention.

That is, the present invention is to provide a flexible hose as a double pipe on the outside of a pressure-resistant flexible hose made of Teflon having flanges at both ends, and to make both ends of the hose adhere to the flange surface of the pressure-resistant flange hose, and to attach the outer hose Is a Teflon flexible hose for liquid halogen having a dehumidified halogen and an inert gas feed hole at one end, and a feed gas discharge hole at the other end of the outer hose. .

Hereinafter, the present invention will be described in detail.

The Teflon flexible hose for pressure resistance, which is usually used for receiving and dispensing liquid halogen, which is commercially available,
As shown in FIG. 1, it has flanges (1) at both ends, and a teflon hose (2) is connected between them.

Furthermore, a thin copper wire (3) is wound on the outer side thereof to enhance the pressure resistance, and the surface thereof is covered with a stainless steel reinforcing wire mesh (4) to further enhance the pressure resistance.

On the outer side of this pressure resistant flexible hose, a hose (11) having good flexibility is provided as a double pipe as shown in FIG.

In this case, the diameter of the double pipe is not particularly limited, but is preferably 2 to 3 times the diameter of the pressure resistant flexible hose.

There is no limitation on the material of the hose as long as it is highly flexible such as vinyl chloride, polyethylene, rubber, etc., but preferably vinyl chloride with good transparency so that the condition of the internal wire mesh can be understood. Is preferred.

The flexible hose can be attached to the pressure-resistant flexible hose as a double pipe by cutting the flexible hose vertically, attaching the flexible hose to the pressure-resistant flexible hose, and then winding and reinforcing the entire surface with a transparent tape. Further, it may be fitted in advance when the pressure-resistant hose is manufactured.

At one end of the flexible hose, a moisture-reducing body feed hole (12) is provided, and at the other end, a gas discharge hole (13) thereof is provided. The inlet hole and the outlet hole may be tubes.

The flexible hose on the outside of the double pipe should be installed in close contact with the flange surfaces, centering on the flange surfaces at both ends. The degree of close contact may be such that the gas to be introduced flows out from the discharge hole, and it is not necessary to withstand the pressure. Further, the center of the flange surface may be adjusted by an appropriate method such as winding an appropriate ring-shaped metal fitting or tape around both ends of the pressure resistant flexible hose.

When receiving and delivering liquid halogen, the halogen and inert dehumidified gas are continuously fed through the feeding hole (12) on the outer flexible hose, and a small amount of halogen that has permeated from the Teflon hose. Is discharged out of the pipe. The halogen and the inert gas are preferably air and nitrogen.

The feeding amount may be an appropriate amount so that the gas does not stay in the flexible hose.

If water is present in the halogen and the inert gas, the halogen that permeates the Teflon hose reacts with the water to form a hydrogen halide compound, which corrodes the stainless steel mesh for reinforcement on the outside of the flexible hose, Since the durability is shortened, it is necessary to reduce the water content as much as possible.

Generally, the dehumidification point of the halogen and the inert gas is -30 ° C or lower.

When the dew point of the halogen and the inert gas is high, the moisture in the gas is large and reacts with the permeated halogen, which is not preferable.

Practically, an appropriate dew point may be set in consideration of the cost of drying.

[Action and effect]

In a conventional pressure-resistant Teflon flexible hose, halogen that permeates Teflon and moisture in the air condense and adhere to the surface of the coated metal wire mesh to generate a hydrogen halide compound. Although it eroded and had a short durability, the double pipe hose of the present invention can prevent the formation of hydrogen halide compounds by passing a dehumidifying body outside, and the durability of the hose is about one year or more. It can be made long and is extremely valuable in practical use.

[Brief description of drawings]

FIG. 1 is a perspective view of a commercially available pressure-resistant flexible hose, FIG. 2 is a perspective view of a Teflon flexible hose for liquid halogen of the present invention, and FIG. It is a figure. FIG. 4 is a side view, and each symbol in the figure has the following meaning. 1: Flange 2: Teflon hose 3: Copper wire 4: Stainless steel reinforcing wire mesh 11: Hose with good flexibility 12: Intake hole for dehumidifying body 13: Gas discharge hole

Claims (2)

[Scope of utility model registration request] 1. A flexible hose for pressure resistance made of Teflon having flanges at both ends is provided with a flexible hose as a double pipe, and both ends of the hose are brought into close contact with the flange surface of the flexible hose for pressure resistance, and the hose on the outside. A flexible hose made of Teflon for liquid halogen having a dehumidified halogen and an inert gas feed hole at one end thereof, and a feed gas discharge hole at the other end of the outer hose. 2. The flexible hose made of Teflon for liquid halogen according to claim 1, wherein the halogen is chlorine, bromine or fluorine.