JPH0649459A - Regeneration of industrial waste oil - Google Patents

Abstract

PURPOSE:To enable the regeneration of an industrial waste oil to a fuel oil (heavy oil) generating little chlorine gas which causes the corrosion of a burner and the lowering of the combustion calorie. CONSTITUTION:Chlorine compounds in a recovered industrial waste oil are removed by adding benzene and/or aniline to the industrial waste oil and irradiating the oil with ultraviolet ray during the regeneration of the waste oil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recycling various industrial waste oils recovered as combustion oils.

[0002]

BACKGROUND OF THE INVENTION Industrial waste oil collected in a storage tank is used as a combustion oil (heavy oil) by removing low boiling point compounds in a heat exchanger and further removing water and solids by a centrifuge. Is being played.

[0003]

By the way, the industrial waste oil collected in the storage tank contains cutting oil, dipping oil during quenching of the metal formed body, and the like. Chlorine-based solvent such as trichlorethylene or tetrachlorethylene used for removing cutting oil adhering to objects and dipping oil adhering to metal moldings is mixed.

[0004] The combustion oil regenerated from waste oil containing chlorine compounds by the above-mentioned conventional method still contains chlorine compounds, and when this is burned, chlorine gas is produced. Therefore, when the regenerated combustion oil is burned, the generated chlorine gas not only causes the combustion device to corrode but also reduces the calories burned.

On the other hand, according to the present invention, by providing a chlorine compound removing step in the step of regenerating a combustion oil from industrial waste oil, a combustion oil composed of a regenerated oil having a low chlorine compound content is obtained. It is a thing.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The method for recycling industrial waste oil of the present invention is to add ultraviolet light by adding benzene and / or aniline to the industrial waste oil during the step of recycling the recovered industrial waste oil as combustion oil. There is a chlorine compound removal step consisting of performing irradiation.

[0007] Industrial waste oil is decomposed into chlorine gas contained in the industrial waste oil by irradiation with ultraviolet rays to become chlorine gas, which is then released into the atmosphere. However, the decomposition reaction of chlorine compounds only by ultraviolet irradiation is extremely slow,
For example, it has been confirmed by experiments by the present inventors that the removal rate of chlorine compounds is about 30% even after 100 hours of UV irradiation, and the method of removing chlorine compounds by only UV irradiation is not practical. .

In the method of the present invention, when chlorine compounds contained in industrial waste oil are decomposed by ultraviolet irradiation and released into the atmosphere, benzene and // Alternatively, by using aniline as a catalyst, chlorine compounds can be efficiently decomposed and removed by ultraviolet irradiation for a far shorter time than in the case of only ultraviolet irradiation.

The amount of benzene and / or aniline as a catalyst to be added to waste oil increases as the amount increases up to a certain range. However, when the amount exceeds 10.0% by weight, benzene and / or aniline are added. Alternatively, it becomes uneconomical because the corresponding effect for increasing the addition amount of aniline cannot be obtained.
Therefore, the addition amount of benzene and / or aniline as a catalyst is sufficient to be about 2.0 to 10.0% by weight of industrial waste oil.

In the industrial waste oil recycling method of the present invention, the industrial waste oil collected from various predetermined locations is stored in a storage tank and then passed through a heat exchanger to remove low boiling point compounds. In the process of making the regenerated oil for combustion what was obtained after separating water and solid matter with a centrifuge,
The UV irradiation treatment with the addition of benzene and / or aniline as described above may be carried out either before the treatment with the centrifuge or after the treatment with the centrifuge during the treatment step of the waste oil.

[0011]

EXAMPLES The concrete constitution of the method for recycling industrial waste oil of the present invention will be described below based on examples.

[Example 1] High chlorine waste oil "chlorine concentration = 1"
0638ppm "in a petri dish with a diameter of 60m / m for 20m
l Weighed, and then 5% by weight of benzene “Wako Pure Chemical 1
UV lamp with a wavelength of 254 nm is added.
: 15 W x 2 lamps manufactured by Labosco ".

By analyzing the chlorine content in the waste oil every predetermined time, the chlorine removal rate with respect to the ultraviolet irradiation time was measured. The results are shown in [Table 1].

[0014]

[Table 1]

[Example 2] High chlorine waste oil "chlorine concentration = 1"
0638ppm "in a petri dish with a diameter of 60m / m for 20m
l Weighed, then 5% by weight of aniline “Wako Pure Chemical 1
UV lamp with a wavelength of 254 nm is added.
: 15 W x 2 lamps manufactured by Labosco ".

By analyzing the content of chlorine in the waste oil every predetermined time, the chlorine removal rate with respect to the irradiation time of ultraviolet rays was measured. The results are shown in [Table 2].

[0017]

[Table 2]

[Example 3] High chlorine waste oil "chlorine concentration = 1"
0638ppm "in a petri dish with a diameter of 60m / m for 20m
After weighing 1, 2.5% by weight, 5.0% by weight, and 7.5% by weight of aniline “Wako Pure Chemical Grade 1” were added to the mixture,
UV lamp with a wavelength of 254 nm "(Ltd.): Labosco,
Irradiation with ultraviolet rays was performed by "15 W x 2 lamps".

By analyzing the chlorine content in the waste oil every predetermined time, the chlorine removal rate with respect to the ultraviolet irradiation time was measured. [Table 3] when 2.5 wt% of aniline was added, [Table 4] when 5.0 wt% of aniline was added, and [Table 4] when 7.5 wt% of aniline was added. 5] respectively.

[0020]

[Table 3]

[0021]

[Table 4]

[0022]

[Table 5]

[Comparative Example 1] High chlorine waste oil "chlorine concentration = 1"
0638ppm "in a petri dish with a diameter of 60m / m for 20m
l After weighing, UV lamp with wavelength of 254 nm
: 15 W x 2 lamps manufactured by Labosco ".

By analyzing the content of chlorine in the waste oil every predetermined time, the chlorine removal rate with respect to the irradiation time of ultraviolet rays was measured. The results are shown in [Table 6] and [Table 7].

[0025]

[Table 6]

[0026]

[Table 7]

[0027]

INDUSTRIAL APPLICABILITY According to the present invention, by providing a step of adding benzene and / or aniline to industrial waste oil and performing ultraviolet irradiation during the step of regenerating the recovered industrial waste oil as combustion oil, It consists of removing chlorine compounds from waste oil. By reducing the content of chlorine compounds in recycled oil used as combustion oil, the amount of chlorine gas generated in the combustion process is suppressed. Is.

Therefore, when the combustion oil obtained by the industrial waste oil regeneration method of the present invention is burned, there is no corrosion of the combustion apparatus due to generation of chlorine gas, reduction of combustion calories, and the like. According to the industrial waste oil reclaiming method, a reclaimed oil for combustion having a high utility value in practical use can be obtained.

Claims (1)

[Claims] 1. A chlorine compound in the waste oil is removed by providing a step of adding benzene and / or aniline to the industrial waste oil and irradiating with ultraviolet rays in the step of regenerating the recovered industrial waste oil as combustion oil. A method for reclaiming industrial waste oil, which comprises removing the waste oil.