SU1691320A1 - Method for purifying effluents from petroleum products and oils - Google Patents

Abstract

The invention relates to the purification of industrial wastewater from oil products by flotation and can be used in the oil refining and metallurgical industries. The purpose of the invention is to increase the degree of wastewater treatment while reducing the cost of the process and reducing the consumption of the collector. The method of sewage treatment includes treatment with a collector followed by separation of the water and oil phases by flotation, and the product of high temperature is used as a collector

Description

The invention relates to the treatment of industrial wastewater, in particular to the treatment of industrial wastewater from oil products and surfactants (surfactants) by flotation, and can be used in the oil refining, petrochemical and metallurgical industries.

The purpose of the invention is to increase the degree of purification while reducing the cost of the process.

To carry out the process, wastewater is treated with high-temperature 150 180 ° C alkaline hydrolytic splitting of tall pitch, taken in an amount of 0.05 0.5 g / m with the following ratio of components: tall pitch: NaOH: H20 1: 0.1 : 0.36.

Tall pitch, sodium alkali and hearth are loaded into stainless steel aktoklav, equipped with an electric heater, and with stirring heated to 150-180 ° C. It is further maintained at this temperature for 1 hour and after cooling it is used as a solution with a concentration of 0.01%.

The product of high-temperature alkaline hydrolytic treatment of talot-plow is a mixture of the following composition,%:

Sodium salt

fat and resin

acids55.0- 60.0

Neymypyaemy 3-4.0

ABOUT

Yu

CJ

yoo o

Alcohols6,2-5,0

Water31.0-29.0

Substances of unknown composition Else Iodine number 106.5 mg 12/100 g of substance, ether number 6.8 mg KOH / g, acid number 88.3 mg KOH / g, saponification number 95.1 mg KOH / g.

The collector concentration in the range of 0.05-0.5 g / m3 provides wastewater treatment to a residual concentration of petroleum products that is acceptable for re-use in the technology of concrete production.

After collecting, the wastewater is treated with a collector for 5-10 minutes and then sent to flotation. The flotation process is carried out for 10-30 minutes, then the treated wastewater is fed to the concrete mixing stage, and the extracted product is transferred to the lubrication of the steam forms. In the flotation process, the following parameters are controlled: the concentration of petroleum products and oils before and after flotation in mg / l, the release rate (if,%), the characteristic of the foam layer.

PRI me R 1. A series of model wastewater is purified, containing, g / l: emulsol in a dispersed state of 0.3-0.5; inorganic salts of 0.3-0.5, which in a volume of 0.2 liters are introduced into the measuring cylinder with a ground in stopper, 0.01% of an aqueous solution of the collector is added to the cylinder in a certain ratio to the volume of wastewater. The cylinder is shaken for 1-2 minutes. Next, the method is carried out on a laboratory flotation unit consisting of a glass column with a diameter of 35 mm and a height of 320 mm, the bottom of which is the Schott Nk 2 filter, a rheometer and compressor. Flotation is carried out for 10-30 minutes

 The data obtained are given in table. 1. Example 2. As source material for the synthesis of the collector, tall oil pitch is used, which is a distillation residue from the distillation of tall oil and is an affordable and cheap waste of pulp and paper production.

Tall pitch is subjected to alkaline hydrolytic cleavage at 180 ° C in an autoclave with forced agitation for 2 hours at a ratio of tall oil pitch: NaOH: H20 1: 0.1: 0.36. The resulting collector is a dark, viscous product, completely soluble in water, with normal

organoleptic properties.

The use of the product of high-temperature alkaline hydrolytic splitting of tall oil pitch in the process of flotation results in a high effect of purification of waste water from oil products and oils (98.6%).

Comparative data known and

The proposed methods are given in Table. 2

In the product of high-temperature alkaline hydrolytic splitting of tall oil pitch, the content of resinous and fatty acids is most optimal for the synthesis of a reagent possessing the properties of a collector of oils and petroleum products. With

the use of anionic type collectors (these include sodium salts of fatty acids) does not achieve high values of oil and oil recovery factors (76.0-80.4%).

The use of the proposed method provides, in comparison with the known, an increase in the degree of wastewater treatment, allows the use of cheaper reagent with good organoleptic properties of the collector while simultaneously reducing its consumption.

In addition, the use of this reagent allows the recovered oil products and oils to be returned to the technology (on

lubrication of forms), and treated wastewater - to reuse them.

Claims (2)

1. Method of sewage treatment from oil products and oils, including processing a collector containing salts of higher fatty acids, followed by separation of the water and oil phases by flotation, characterized in that, in order to increase the degree of purification while reducing the cost of the process, the product of processing at 150-180 ° C of tall oil pitch sodium hydroxide the presence of water at a ratio components 1: 0,1: 0,36 respectively. 2. The method according to claim 1, wherein the collector consumption is 0.05-0.5 g / m3. Table 1 Table 2