Method for treatment of depleted mineral oils

FIELD: chemical technology.

SUBSTANCE: method involves filtration of depleted mineral oils through a mixture of Fe3+ oxide and sand taken in the weight ratio sand : Fe3+ oxide = 1:(0.5-1.0). Method provides enhancing degree of purification of depleted mineral oils.

EFFECT: improved method of treatment.

1 tbl, 8 ex

 

The invention is directed to solving the problems of environmental ecology and conservation of mineral raw materials, namely, on the return of spent mineral oil in production.

Mineral oil during operation of machines and devices in contact with the metal exposed to air, temperatures, pressures and other factors, saturated with various impurities. As a result, the oils accumulate the products of chemical reactions - asphaltene-resinous compounds, colloidal coke and carbon black, and metal and mineral dust, these substances are paramagnetic and contribute to the formation of large aggregates (colloidal particles), polluting oil and deteriorating their performance properties. Used mineral oils are characterized by a dark color, a high prevalence of viscosity and acid number. Due to the lack of technological methods of cleaning used mineral oil burn or merge in the dumps, which creates problems of environmental environment.

There is a method of cleaning industrial oils concentrated (96%) sulfuric acid in an amount of 10 wt.% for raw materials with vigorous stirring followed by treatment with water. Before cleaning the oil is cleaned from mechanical impurities and drainage (DD patent 294725). The disadvantage of this method is the fact, when processing oil with sulfuric acid forms a stable emulsion in the form of a solid mass of black, in which labor is divided phases, even after prolonged standing.

The technical nature of the proposed method is the closest way of filtering the used oil through a mixture of adsorbent and sand in the range of from 1:0.5 to 1:50 (RU patent 2153526). As the adsorbent can be used silica gel, charcoal and other purification were analyzed by electrophotometer and dielectric sensing, to assess the degree of clarification, but not the degree of purification of oils. The disadvantage of this method is insufficient purification of oils.

The task of the invention is to improve the treatment efficiency of spent mineral oil.

According to the invention the technical result is achieved in that the filtration of mineral waste oils is carried out through a mixture of sand and oxide of Fe+3the ratio of sand : the oxide of Fe+31:(1,0-0,5). Red-brown powder of oxide of Fe+3is formed by heating up to 200°With brown water of iron oxide FeO(OH), obtained by hydrolysis of a solution of chloride of Fe+3/Cotton, Guiltinan. Modern inorganic chemistry. - M - World. - 1969. - s/. Hardware refers to the elements of the d-group, have five unpaired electrons in the d orbitals which makes it well known complexing ability.

The degree of purification of oil controlled by changing the acid number, viscosity and color.

Acid number is determined according to GOST 20799-88, visually determine the color (the degree of clarification), dynamic viscosity according to GOST 1920-87. The method is tested for spent industrial oil I-20A dark brown color, with an acid number of 0.5 mg KOH/g, dynamic viscosity at 40° - 39,0 MPa·and vacuum oil VM-4 dark brown, with an acid number of 0.6 mg KOH/g, viscosity at 50° - 62,4 mm2/s

Fresh commodity oil I-20A (GOST 20799-88) is characterized by an acid number of 0.005 mg KOH/g, dynamic viscosity at 40° - 31,78 MPa·and a light yellow color.

Fresh commodity oil VM-4 (TU 0253-004-7821-2002) is characterized by an acid number of 0.002 mg KOH/g, dynamic viscosity at 50° - 50,6 MPa·and a light yellow color.

Example 1. To 15 g of sand (particle size distribution 160-450 μm) added 15 g of the oxide of Fe+3(dispersion of particles of 100-400 μm) ratio (sand : the oxide of Fe+3- 1:1), mixed and transferred into a glass column. Up column serves 300 g of used industrial oil I-20A under pressure. The process is conducted with speed, providing the time of contact of the oil with the adsorbent for at least 1 hour. The filtered oil is examined for the degree of purification. The results are presented in the table.

The use of the 2. All as in example 1, except that the ratio of sand: the oxide of Fe+3- 1:0.75 in. The results are presented in the table.

Example 3. All as in example 1, except that the ratio of sand: the oxide of Fe+3- 1:0,5. The results are presented in the table.

Example 4. Analogously to example 1, only cleaned with a vacuum oil at the ratio of sand : the oxide of Fe+3- 1:1. The results are presented in the table.

Examples 5, 6. Analogously to example 1, only cleaned with a vacuum oil VM-4 with a ratio of sand:the oxide of Fe+3- 1:0.75 and 1:0,5 respectively. The results are presented in the table.

Example 7. (the prototype) 15 g of silica gel (grade ASC, the faction with the dispersion part 160-250 µm) and 15 g of sand (particle size distribution 160-450 μm) was transferred to a glass column. Up column serves 300 g of used industrial oil I-20A under pressure. The process is conducted with speed, providing the time of contact of the oil with the adsorbent for at least 1 hour, filtered oil is examined for the degree of purification. The results are presented in the table.

Example 8. (the prototype). All as in example 7, only cleaned with a vacuum oil VM-4. The results are presented in the table.

Mass
Table
Cleaning requirements and quality of the refined oil
No.Acid*ViscosityColor
exampleSpentrationumber mgmm2/s
oilsand : oxideKON
Fe+31 g butter
1Industrial1:0,5of 31.8
2oil I-20A1:0,750,01931,2Light
31:10,01831,2yellow
0,019
4Vacuum oil1:0,50,01550,6
5VM-41:0,750,01650,6Light
61:10,01550,2yellow
7Industrialna the placeholder0,4837,0Dark
oil I-20Abrown
8Vacuum oilthe placeholder0,6060,4Dark
VM-4brown
* For industrial oil I-20A dynamic viscosity is determined at 40°for vacuum oil NR-4 viscosity is determined at 50°C.

As follows from the results table, unlike the prototype, the proposed method achieves a more complete cleaning of spent mineral oil.

The method of purification of spent mineral oils, including filtration through a mixture of adsorbent and sand, characterized in that the adsorbent is used, the oxide of Fe+3when the weight ratio of sand : the oxide of Fe+31:0.5 to 1.0.



 

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