TWI639696B - Treatment agent for recycling used lubricating oils for reuse - Google Patents

Abstract

A treatment agent for recycling waste lubricating oil, the waste lubricating oil recycling treatment method comprises: adding the foregoing treatment agent to a waste lubricating oil, forming the waste lubricating oil to form a sediment layer and being available for reuse again. An oil layer, wherein the treating agent comprises one of an alkali solution and an acetic acid mixed with each other, and the alkali liquid contains a chelate. Thereby, the main processing procedure of the waste lubricating oil can be completed by using the pre-mixed acid solution, the alkali solution and the chelate as the treating agent, so as to simplify the waste lubricating oil recycling treatment program and improve the waste lubricating oil recycling treatment. The economic benefits, and create resources and environmental protection and other win-win.

Description

Treatment agent for waste lubricating oil reuse

The invention relates to a treatment agent for recycling waste lubricating oil, in particular to using a pre-mixed acid-base solution as a treatment agent to simplify the recycling process of waste lubricating oil.

Lubricating oil is mainly used in vehicles and factory process oils. With the development of urbanization and industrialization in Taiwan, the use of lubricating oil has also increased, and correspondingly produced a large amount of waste lubricating oil, which poses a serious threat to the environment. However, if these waste lubricating oils can be properly treated and reused, not only can economic benefits be generated, but also the environmental impact of a large amount of waste lubricating oil can be reduced.

For the traditional waste lubricating oil treatment method, please refer to Lin Xianglin and Liu Junxian's "Recycling and Recycling of Waste Lubricating Oil" or "Recycling of Waste Oil to Fuel Oil" by the Republic of China Patent No. I319433. Acidic clay method, distillation method, solvent extraction method, direct contact medium hydrogenation method, low temperature batch method. However, the acid white clay method, the distillation method and the solvent extraction method all require the treatment and decolorization of the clay, which is costly and time consuming. Moreover, the acid is traditionally used as a strong acid such as sulfuric acid, nitric acid or hydrochloric acid, and the strong acid causes oil. Decomposition, composition changes, and the oil becomes more soluble in water and alcohol, and the properties change and are difficult to reuse. As for the direct contact medium hydrogenation method and the low temperature batch method, the cost is higher and the operation procedure is complicated, and the economic benefit of waste lubricating oil recovery is reduced.

Therefore, the present inventors have proposed a waste lubricating oil recycling treatment method for making the waste lubricating oil recycling treatment more economical, comprising: adding a treating agent to a waste lubricating oil to make the wastefulness The lubricating oil forms a precipitate layer and a reusable oil layer which can be reused, wherein the treating agent comprises an alkali solution and an acetic acid mixed with each other in advance, and the alkali liquid contains a chelate compound.

Further, the chelate is disodium edetate (Ethylenediaminetetraacetic acid disodium salt, EDTA-2na), the disodium edetate and an aqueous ammonia are mixed with each other to form the lye.

Further, the alkali solution is a mixed solution of ammonia water or ammonia gas, disodium edetate and water, and the ratio of the alkali liquid to the acetic acid is 5±1:3±1.

Further, the waste lubricating oil was allowed to stand for 24 hours ± 2 hours.

Further, the precipitate layer was taken out and then heated to 650 ° C ± 50 ° C to evaporate the residual oil contained in the precipitate layer.

The present invention is also a treating agent for waste lubricating oil reuse, comprising mixing an alkali solution and an acetic acid with each other, and the alkali liquid contains a chelate compound.

Further, the chelate is disodium edetate (Ethylenediaminetetraacetic acid disodium salt, EDTA-2na).

Further, the disodium edetate and the aqueous ammonia are mixed with each other to form the lye.

Further, the ratio of the lye to the acetic acid is 5 ± 1:3 ± 1.

Further, the mixing speed of the alkali solution and the acetic acid is 50 rpm, the mixing time is 0.5 to 1 minute, and the pH of the treatment agent is 2 to 4.

According to the above technical features, the following effects can be achieved:

1. When using the pre-mixed acid solution, lye and chelate as the treatment agent, the main processing procedure of the waste lubricating oil can be completed to simplify the waste lubricating oil recycling process and improve the waste lubricating oil recycling process. Economic benefits.

2. Using acetic acid as an acid agent, the treatment process does not require heating and the use of acid white clay as an adsorbent to simplify the processing procedure and cost. Moreover, the use of acetic acid can avoid excessive decomposition of the waste lubricating oil and the composition difference is too large.

3. The time required for the processing procedure can be shortened to about 24 hours to further improve the economic benefits of waste lubricating oil recycling.

[First figure] is a schematic block diagram of a flow of an embodiment of the present invention.

In combination with the above technical features, the main effects of the treating agent for waste lubricating oil reuse of the present invention will be clearly shown in the following examples.

Hereinafter, referring to the first figure, a method for treating waste lubricating oil reuse according to an embodiment of the present invention includes: adding a treating agent to a waste lubricating oil, so that the waste lubricating oil can form a sediment layer and can be reused. An oil layer is used, wherein the treating agent comprises one alkali solution and one acetic acid mixed with each other, and the alkali liquid contains a chelate compound. The reason for using acetic acid is that excessive decomposition of the waste lubricating oil can be avoided, and the difference in composition is too large. In detail, the lye may be added in an amount of 4% to 6% by weight. The acetic acid may be added in an amount of 2% to 4% by weight, so the ratio of the alkali to the acetic acid is 5±1:3±1, and the pH of the treating agent is between 2 and 4. After repeated experiments, the ratio of lye to acetic acid was 5:3, and the pH value was 3.5.

Specifically, the waste lubricating oil is taken in the present embodiment as 100 ml, and the alkali liquid is a mixed solution of ammonia water (or ammonia gas), Ethylenediaminetetraacetic acid disodium salt (EDTA-2na) and water. In the present embodiment, 10 ml of the ammonia water, disodium edetate (EDTA-2na) was 4 g, and water was 90 ml. The mixing speed of the lye and the acetic acid was 50 rpm, as in the present example, 200 rpm, and the mixing time was 0.5 to 1 minute.

However, the implementation is not limited to the above conditions. For example, the disodium edetate is preferably dissolved in aqueous ammonia. Therefore, ammonia water is selected as the alkali solution, but not limited thereto, for example, the ethylenediaminetetraacetic acid Sodium can also be dissolved in sodium hydroxide or potassium hydroxide. Therefore, it is also a viable option to use sodium hydroxide or potassium hydroxide as the alkali solution. In addition, the chelate is not limited to the disodium edetate. For example, metal chelate such as Diethylenetriaminpentacetic acid (DTPA) is a viable option. The main purpose is to adsorb. Metal ions in the waste lubricating oil. In this embodiment, the reason why the chelate compound uses disodium edetate is that it can be recovered for the metal cutting lubricating oil used in the surface treatment industry, so the elements of the metal powder (such as iron and aluminum) must be Metal elements such as copper, manganese, and vanadium are chelated and precipitated, and accelerate the precipitation rate of impurities.

In the present embodiment, in the present embodiment, after the treatment agent is added, the waste agent is uniformly mixed with the waste lubricating oil after being added to the treatment agent, so that the stirring speed can be maintained at about 200 rpm for 3-5 minutes. Mixing is carried out, followed by standing for a period of time (e.g., standing for 24 hours ± 2 hours) to form a substantially liquid recycled oil layer and a substantially nearly solid precipitate layer. Then, the precipitate layer is taken out and further heated to 650 ° C ± 50 ° C to evaporate the residual oil contained in the precipitate layer, thereby conveniently recovering the metal of the precipitate layer (for example, sold to metal recyclers, ironworks) , foundry, etc.). The oil layer recovered in this example has a dark brown color, an acid value of 2.563 KOH/mg/g, a viscosity of 0.526 ml/sec, a moisture content of 0.12%, and a specific gravity of 0.85. .

The difference between this embodiment and other general waste lubricating oil processing methods will be further described below with reference to Table 1.

In view of the foregoing description of the embodiments, the operation and the use of the present invention and the effects of the present invention are fully understood, but the above described embodiments are merely preferred embodiments of the present invention, and the invention may not be limited thereto. Included within the scope of the present invention are the scope of the present invention.

Claims (5)

A treatment agent for recycling waste lubricating oil, comprising mixing an alkali solution and an acetic acid with each other, and the alkali liquid contains a chelate compound. The treatment agent for waste lubricating oil reuse according to claim 1, wherein the chelate is Ethylenediaminetetraacetic acid disodium salt (EDTA-2na). The treatment agent for waste lubricating oil reuse according to the second aspect of the invention, wherein the disodium edetate and the aqueous ammonia are mixed with each other to form the alkali liquid. The treatment agent for waste lubricating oil reuse according to claim 1, wherein the ratio of the alkali liquid to the acetic acid is 5±1:3±1. The treatment agent for waste lubricating oil reuse according to claim 4, wherein the mixing speed of the alkali liquid and the acetic acid is 50 rpm, the mixing time is 0.5 to 1 minute, and the pH of the treatment agent is 2~4.