Coalescent material for separating oil/water mixture

FIELD: water treatment.

SUBSTANCE: invention relates to treatment of industrial and household waters, especially to separation of oil/water mixtures to remove coarsely dispersed and emulsified petroleum products therefrom. It is proposed to use styrene/divinylbenzene copolymer grains with fraction composition uniformity factor not higher than 1.6 as coalescent material to separated oil/water mixtures. In this case, price of material is lowered, oil/water separation efficiency is enhanced, and necessity of periodically washing material is omitted, whereas lifetime of material is prolonged, and efficiency temperature range is extended.

EFFECT: improved performance characteristics and reduced expenses.

2 dwg

 

The invention relates to the field of water treatment, industrial or domestic wastewater, mainly to the field of separation neptunomonas mixture to remove coarse and emulsified oil.

It is known the use of anion exchange resin based on N-alteromonas porous copolymer of divinylbenzene and 2-methyl-5-vinylpyridine) - derivatives EAP-AP as a material for separation neptunomonas mixture (USSR Author's certificate No. 1161536, IPC With 10 G 33/06, publ. 15.06.85, bull. No. 22). This material provides insufficient quality of the separation neptunomonas mixture has a limited resource that is associated with the limited capacity of its porous structure (oil capacity), and requires periodic leaching of significant amounts of clean water.

It is also known the use of anion exchange resin, for example, the brand AB 17-8 with a grain size of 0.5-0.7 mm as granulated download for separation neptunomonas mixture (certificate of the Russian Federation No. 472 for a utility model, IPC 6 01 D 17/022, publ. 16.06.95, bull. No. 6).

The disadvantages of using a known material used for the separation neptunomonas mixture are:

- high cost;

insufficient separation efficiency neptunomonas mixture associated with technological limitations, due to the properties of anion exchange resin (significant Nauheim the diamonds in the water, large shrinkage during drying and thermal resistance of no more than 60°).

Known materials are hydrophilic surface and porous structure, causing them to swell upon contact with water. In this regard, the drain apparatus for the separation neptunomonas mixture using anion exchange is impossible, as when dry anion exchange resin granules are reduced in volume, resulting in the reduction of total load. Under the action of gravitational forces dried granules of anion exchange resins have been at the bottom of the body of the device and subsequent filling apparatus neptunomonas mixture, swelling, can no longer fill occupied first volume that under certain structural features of the apparatus for the separation neptunomonas mixture leads to a partial flow without purification, bypassing granulated load, resulting in reduced quality of the separation neptunomonas mixture.

Temperature restrictions when using anion exchange resin as a material for separation neptunomonas mixture related to the fact that the anion exchange resins have a heat resistance up to 60°C. For this reason, heating neptunomonas mixture and rinse water in the apparatus for the separation using the download from the anion exchange resin granules should not exceed 60°C.

The deficiencies noted significantly reduce the effectiveness of the division is neptunomonas mixture.

The task of the invention is to reduce the cost of the material used for the separation neptunomonas mixture, and the higher efficiency of separation neptunomonas mixture by increasing the quality of the separation, eliminating the need for periodic leaching used to separate neptunomonas mixture of the material, increasing its service life and the extension temperature boundaries in the operation of material used.

This problem is solved, and the mentioned technical result is achieved by using as the coalescence material for separation neptunomonas mixture of a copolymer of styrene with divinylbenzene.

A copolymer of styrene with divinylbenzene and its main purpose is known. It is used in industrial production of the best qualities of ion-exchange resins designed for chemical demineralization process water in a large power system, including in the nuclear (Helfferich F. Ion exchangers. Principles of ion exchange. - M.: Publishing house of foreign literature, 1962, p.18-20; Saldadze K.M., Pashkov A.B., Titov, V.S. Ion-exchange high-molecular compounds. - M.: State scientific and technical publishing house of the chemical literature, 1960, pp.54-75).

A copolymer of styrene with divinylbenzene are used as well (http://firma-dis.narod.ru):

in hydrometeor the AI for the extraction and preconcentration of gold from solutions and slurries;

- to separate the cyanide complexes of non-ferrous and noble metals by sorption from ore pulps complex salt composition;

- in the processes of extraction of molybdenum from the acidic ore slurries and solutions.

However, a copolymer of styrene with divinylbenzene are still not used as a coalescent material for separation neptunomonas mixture as utilitarian properties in this area studied were not.

The study was subjected to the properties of a copolymer of styrene with divinylbenzene (on THE 6-05-1811-83 ISM. 1), which is the initial product to obtain anion brand AB 17-8 on the scientific production Association "Plant ion-exchange resins", Omsk (Russian Federation).

A copolymer of styrene with divinylbenzene appearance is small transparent spherical granules having a layer of white color with a faint pinkish and yellowish shades. The granular composition contains at least 95% fraction with grain sizes from 0.25 to 0.8 mm, coefficient of uniformity does not exceed 1.6. Specific volume of a copolymer of styrene with divinylbenzene from 2.4 to 2.7 cm3/year of Pellets of a copolymer of styrene with divinylbenzene are hydrophobic surface, porous structure and thermal stability up to 100°C. It is resistant to water, alkalis, acids and various detergents (TU 6-05-1811-83 ISM. 1).

The division was subjected to attendanoe mixture, received emulsifier hydrodynamic type mixing water and oil brand M40. Emulsified thus the oil-water mixture was passed through a continuous layer of pellets of a copolymer of styrene with divinylbenzene thickness of 78 mm

The separation process neptunomonas mixture is illustrated by the graphic images shown in figures 1 and 2.

The figure 1 depicts the pellets of a copolymer of styrene with divinylbenzene, in the process of contact with their shared neptunomonas mixture.

Figure 2 depicts a graph showing the distribution of particles (drops) of oil M40 in neptunomonas mixture before and after separation.

When filtering neptunomonas mixture through a layer of granules 1 copolymer of styrene with divinylbenzene water 2 is repelled from the surfaces of the pellets 1 and passes freely through the channels between them, and fuel oil (including emulsified) due to the adhesion-sticks to the surfaces of the pellets 1, getting into their internal pore 3, and forms a film, which in places of contact of the granules with each other to form menisci 4. Connecting with each other, menisci 4 fill the channels between the grains 1, the forming surface 5 of section environments "water - oil - air".

Separated from drops of oil, water 2 passes freely through the channels between grains 1 and during pushes on the periphery of the granular layer sections joined other the other meniscus 4, which are formed in large quickly pop drops of oil.

Thus, in the separation process neptunomonas mixture by filtration through a granular solid layer of a copolymer of styrene with divinylbenzene there is a classical phenomenon of coalescence (merging) drops of oil followed by the separation of them from the water.

At the termination skip neptunomonas mixture through a continuous layer of pellets of a copolymer of styrene with divinylbenzene and drainage apparatus for separating neptunomonas mixture of granules was not dried out, and occupied by the granules volume has not decreased. Therefore, when re-filling apparatus for separating neptunomonas mixture and passing neptunomonas mixture through a load of pellets of a copolymer of styrene with divinylbenzene was not identified caking download and formation of gaps, which excluded the flow neptunomonas mixture, passing the granulated load, and thereby improved the quality of separation neptunomonas mixture.

For a deeper analysis of the quality of separation neptunomonas mixture with the use of a copolymer of styrene with divinylbenzene were counted number of particles (drops) of oil M40 and their sizes before and after the separation.

For the specified count has been used microscope Intel QX3, having a digital camera with a USB interface that allows you to process p is obtained pictures on the computer.

The results of processing of experimental data presented in figure 2 as curve 6, which characterize the distribution in neptunomonas mixture of particles (drops) of oil M40 according to their size and the number before the separation, and in the form of curve 7, which characterize the distribution in neptunomonas mixture of particles (drops) of oil M40 according to their size and the number after the separation.

Analysis of experimental data allows to draw a conclusion about the high quality of separation neptunomonas mixture when applying for separation as a coalescence of the material of a copolymer of styrene with divinylbenzene.

In the course of the research it was also found that after a certain time (depending on the concentration of oil in the partial mixture, the rate of filtration of the mixture and its temperature) separation process neptunomonas mixture enters the steady state, after which the amount of oil in the granular layer of the load remains constant and does not depend on the concentration in the original neptunomonas mixture. This circumstance has eliminated the need for leaching download from pellets of a copolymer of styrene with divinylbenzene or replacement.

In the process of further research demulsifying properties of the granular layer of a copolymer of styrene with divinylbenzene was installed in his unlimited operational re is URS. When sedimentation (siltation) granular layer of this material asphaltenes and paraffins contained in the oil, it cleans easily (regenerated) in the light of diesel fuel by bubbling it with compressed air, whereas granule loading of the known anion exchange resins used as sorbents, as the experience of the technical operation of the ship filtration equipment, water treatment with 1%content of fuel oil M40 requires regeneration or replacement after 50-100 hours of operation.

When carrying out the regeneration load of pellets of a copolymer of styrene with divinylbenzene clean warm water the temperature was increased to 95°as pellets of a copolymer of styrene with divinylbenzene have heat resistance up to 100°C, thereby increasing the temperature limits at operation used to separate the material.

The commercial value of a copolymer of styrene with divinylbenzene two times less than the value produced on the basis of ion-exchange resin (anion and cation), currently used as sorbents in marine filtration equipment to prevent pollution of waste meteodannym mixtures.

Analysis of research and experimental data allowed us to conclude that primarilyacapella styrene with divinylbenzene as the coalescence material for separation neptunomonas mixture is more effective and efficient compared with the ion-exchange resins, manufactured on its basis, as well as with other known sorbents, which are currently used in marine filtration equipment.

The use of pellets of a copolymer of styrene with divinylbenzene, which is the initial product to obtain anion brand AB 17-08, homogeneity coefficient of fractional composition of not more than 1.6 as coalescence material for separation neptunomonas mixture.



 

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