The method of obtaining graphite sorbent

 

(57) Abstract:

The invention relates to the field of environmental protection and can be used to collect the spilled oil and petroleum products to surface water bodies, as well as for containment of oil spills, including the burning of oil. The method of obtaining graphite sorbent by thermal expansion of the oxidized graphite powder provides preliminary mixing of oxidized graphite powder compounds of iron, cobalt or Nickel in the organic liquid to obtain a sorbent magnetic properties. After uniform distribution of the metal joints in the volume of the mixture of organic liquid is separated solid phase is dried to a friable state and then hold its thermal expansion at 900-1300oC. as compounds of iron, mainly used oxide compounds, in particular magnetite (Fe3O4). Compounds of cobalt and Nickel can be used together with compounds of iron or separately. Oxidized graphite can be mixed with powder of magnetite to the weight of the iron content from 1.5 to 35% in terms of metal. Suitable organic liquids include gasoline, acetone, diesel fuel or gatestone. 3 C.p. f-crystals, 2 tab.

The technical field

The invention relates to the field of environmental protection and can be used to collect the spilled oil and petroleum products to surface water bodies, as well as for containment of oil spills, including burning oil.

Prior art

Know the use of thermally expanded graphite (TWG) as a sorbent to absorb and transfer in the solid state, liquid waste oil and waste oil products (patent GB 2149769, 1985). Its use on the open water is difficult because of the complexity of the collection of saturated oil sorbent with the surface of the water, which leads, as a rule, to a noticeable loss of sorbent and insufficient clean water.

There is a method of collecting oil from the surface of the water by the TWG as a sorbent in which the granular adsorbent is a porous elastic fireproof shell (international application WO 97/20110). The method provides for flocculent TWG immediately before collecting oil by exposure to high temperature powder of oxidized graphite directly in the shell in the form of Bon mats. Sorbent molodet, not removing the sorbent from the shell. The disadvantages of this method are the complexity of the regeneration of the sorbent in large shells, and limited surface adsorption, defined by the geometrical sizes of shells. In addition, the need to use elastic shells, rigid frames thereto, and means for connecting separate membranes between them makes this method rather time-consuming and uneconomical.

The invention

The proposed method allows to obtain graphite sorbent for removal of oil and petroleum products from the surface of the water, which, after saturation with oil can be quite easy and almost fully assembled with the surface of the water for further regeneration and reuse.

The method of obtaining graphite sorbent by thermal expansion of the oxidized graphite powder provides preliminary mixing of oxidized graphite powder compounds of iron, cobalt or Nickel in the organic liquid to obtain a sorbent magnetic properties. After uniform distribution of the metal joints in the volume of the mixture of organic liquid is separated solid phase is dried to a friable state and d is orbent becomes ferromagnetic properties, while hydrophobicity, high sorption capacity and low bulk density. This allows the sorbent to stay afloat even at the maximum oil saturation. The collection of saturated sorbent from the water surface is performed using structurally simple equipment, is equipped with an electromagnet or a permanent magnet.

As compounds of iron oxide is mainly used for the connection, in particular magnetite (Fe3O4). Compounds of cobalt and Nickel, mostly in the form of inorganic salts, can be used together with compounds of iron or separately.

The source material for this sorbent can serve as graphite powder various industrial brands, including low-grade high-ash graphite, which is exposed to strong oxidizers. Oxidized graphite can be mixed with powder of magnetite to the weight of the iron content from 1.5% to 35% in terms of metal. The same range of weight ratios is stored and in the case of compounds of cobalt and Nickel. When the iron content of about 15%, an optimum combination of a relatively high magnetic and sorption characteristics of the sorbent is the acceptable range and, as a rule, does not exceed 5,0 kg/m3.

For the implementation of the proposed method suitable organic liquids are widely available gasoline, acetone, diesel or gas condensate, but can be used and other liquids, wetting oxidized graphite.

The main characteristics of the sorbent STRG-M are the bulk density and sorption capacity (as known sorbents), as well as magnetic properties, the coercive force, the specific saturation magnetization and the specific remanence.

Information confirming the possibility of carrying out the invention

To the dry powder of oxidized graphite was added different amounts of powder of magnetite to iron content from 1.5% to 45% in terms of metal. Powders oxidized graphite and magnetite filled with an organic liquid at a volume ratio of T : W of approximately 1 : 1.5, and the mixture was subjected to intensive mixing. As the organic liquid used acetone and gasoline, referred to hereinafter in the tables by the letters a and B respectively. After mixing, the liquid was separated on a filter or a centrifuge, or by evaporation, and the solid phase wysu the rhenium particles of oxidized graphite. The resulting product was a magnetic sorbent.

The magnetic characteristics of the sorbent at various Fe3O4in the original oxidized graphite was measured by the following method.

A portion of sample was mixed with a binder (three times distilled paraffin) and homogenized in a solution of benzene by ultrasonic treatment of the mixture for 20 minutes. After removal of benzene by heating to 60oC in conditions of medium vacuum (0.1 ATM) and the mixture was molded into tablets having a diameter of 3 mm and a thickness of 0.5 mm, the Mass of the samples was changed from 4 to 23 mg Measurements were carried out on the magnetometer PAR 155 at a temperature of 21oC. the Absolute value of the magnetization of the samples was controlled using a reference sample (Nickel foil with a thickness of 1.1 μm and a diameter of 3 mm). Magnetic characteristics of samples of the sorbent are shown in table 1, wheres- specific saturation magnetization (per gram of substance);rspecific remanent magnetization; Jrthe relations/r; Hc- the coercive force.

The dispersion of the values sandrput 15% due to the uneven distribution of powder of magnetite in the samples of the sorbent.

In table 2 prevedonline iron content. For comparison given the example with conventional sorbent that does not contain iron.

As follows from the data in the tables, the optimum combination of properties of the samples 15% (a) and 15% (B), which maintain the highest sorption of oil and gasoline and relatively high magnetic characteristics with a slight increase in bulk density of the sorbent.

Industrial applicability.

In addition to the above application of the sorbent, obtained according to the invention, it is also possible to use a sorbent for purification of oily soil. In this case, the soil can be mixed with the sorbent, and for some time after the saturation of the sorbent oil, fill it with water. The sorbent with absorbed oil floats on the water surface, where it can be assembled using magnetic devices.

1. The method of obtaining graphite sorbent, including thermal expansion of the oxidized graphite powder, wherein the powder of oxidized graphite mixed with a powder of compounds of iron, cobalt or Nickel and an organic liquid, stirred the mixture, separating the organic liquid and dry solid phase to the bulk state, p is organisations use iron magnetite.

3. The method according to p. 2, characterized in that the oxidized graphite is mixed with powder of magnetite to the weight of the iron content of 1.5 to 35% in terms of metal.

4. The method according to p. 1, characterized in that the organic liquid used gasoline, acetone, diesel or gas condensate.

 

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