JPH0454147A - Method for purifying fluorine-based inert liquid - Google Patents

Abstract

PURPOSE:To purify a fluorine-based inert liquid according to simple procedures without using troublesome means such as distillation by bringing the aforementioned liquid into contact with active carbon, making impurities, especially oils in the above-mentioned liquid adsorb on the aforementioned active carbon and removing the impurities. CONSTITUTION:A fluorine-based inert liquid, e.g. a fluorocarbon (C8F16O; used as an insulating refrigerant in gas-insulated transformers is brought into contact with active carbon having preferably 30-80 mesh size to adsorb impurities, especially soluble impurities (such as oils which are a main cause for producing copper sulfide) in the aforementioned liquid. Thereby, the above-mentioned purities are removed. As a result, the aforementioned liquid is purified according to extremely simple procedures without using troublesome means such as distillation to afford the aforementioned liquid, useful as the insulating refrigerant used in high-voltage electric apparatuses such as the gas-insulated transformers and having excellent electrical characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for purifying a fluorine-based inert liquid used as an insulating refrigerant for a gas insulated transformer, for example.

[Prior Art] Insulating refrigerants used in high-voltage electrical equipment such as gas-insulated transformers are required to have excellent electrical properties, and are generally fluorinated refrigerants such as fluorocarbons (C, F□, o). Activated liquids are used.

Conventionally, impurities, particularly soluble impurities (such as oil that causes the production of copper sulfide) in such a fluorine-based inert liquid have been removed by distillation.

[Problems to be Solved by the Invention] However, purification of fluorine-based inert liquids by distillation is extremely complicated, and it has been desired to be able to purify by simpler means.

This invention was made in order to solve the above-mentioned problems, and its purpose is to obtain a method that can purify a fluorine-based inert liquid using a simple procedure.

[Means for Solving the Problems] A method for purifying a fluorine-containing inert liquid according to the present invention purifies a fluorine-containing inert liquid by bringing it into contact with activated carbon.

[Function] In the fluorine-containing inert liquid purification method of the present invention, the activated carbon comes into contact with the fluorine-containing inert liquid, thereby adsorbing and removing impurities, particularly oil, in the fluorine-containing inert liquid.

[Embodiments of the Invention] Hereinafter, as an embodiment of the present invention, a case will be described in which fluorocarbon (Cs F x -○) is used as the fluorine-based inert liquid.

C, F, and O used as samples were added with mineral oil in advance and boiled to dissolve the mineral oil. The oil content in C, F, and O determined from the evaporation residue was 118 wt, ppm (21°C)
It is.

On the other hand, the refining material used to adsorb and remove the oil in C, F, and O is activated carbon with a mesh size of 30 to 80.

Activated alumina, molecular sieve 5A and cellulose filter media. These materials must be rated 11 times before use.
It was dried at 0°C for about 24 hours.

The purification treatment was carried out by filling a glass cylinder with an inner diameter of 2 am and a height of 50 cm with about 50 g of each of the above-mentioned purification treatment materials. Note that glass wool was placed at the bottom of the glass cylinder to prevent the fine powder from each of the purified materials from falling.

During the refining process, approximately 200 ml of
11Q C, Fl, and 0 were dropped at a flow rate of approximately 50 per minute, and the C, F, and 0 that had passed through each of the refining materials were collected from the bottom of the glass tube. Collected C, Fl, O after purification treatment
The amount of evaporation residue was measured by heating 150+++Ω at about 100°C.

With the above steps, C
When 8F□, 0 was purified, the oil content and oil removal rate after the purification process are shown in Table 1 below.

From Table 1 above, it can be seen that by passing C11F 1 Go through each of the refining materials, the oil content in C and F1 GO decreases. Especially for activated carbon, 120t
It is possible to completely remove oil equivalent to IT, pprn, and it is clear that the oil removal ability is superior to other refining materials.

In other words, by simply bringing the fluorine-based inert liquid into contact with activated carbon, impurities, especially oil, in the fluorine-based inert liquid can be adsorbed and removed without using complicated means such as distillation.

In addition, in the above example, the removal of oil in the fluorinated inert liquid was explained, but the same effect can be achieved in the removal of other dissolved components that are harmful to the performance of the fluorinated inert liquid, such as water. Needless to say. Further, in the above embodiment, the case where the fluorine-based inert liquid is C, F, O is explained, but the present invention is not limited to this, and the same applies to other fluorine-based inert liquids. , and the same effects as in the above embodiment can be obtained.

[Effects of the Invention] As described above, according to the present invention, impurities in the fluorinated inert liquid are removed by bringing the fluorinated inert liquid into contact with activated carbon. This method is not necessary, and has the effect of purifying a fluorine-based inert liquid using an extremely simple procedure.

Claims (1)

[Claims] A method for purifying a fluorine-based inert liquid, which comprises purifying the fluorine-based inert liquid by bringing it into contact with activated carbon.