SU1546429A1 - Method of purifying waste water from petroleum products - Google Patents

Abstract

The invention relates to methods for treating wastewater from petroleum products, can be used in the refining and petrochemical industries, chemical and other industries, and reduces the duration of the process while maintaining a similar degree of purification. In order to carry out the process, coagulant aluminum sulfate and flocculant sodium hydroxide saponified by sodium hydroxide, the polymerization product of wastewater from the production of graft copolymer of acrylonitrile with ethylene-propylene rubber, is introduced into wastewater containing petroleum products. The method makes it possible to reduce the duration of settling from 30 to 15 minutes with a residual content of oil products in purified water of 0.5 mg / l. 2 tab.

Description

The invention relates to methods for the purification of industrial wastewater from petroleum products and can be used in the refining and petrochemical industries, chemical and other industries.

The purpose of the invention is to reduce the duration of the process while maintaining a similar degree of purification.

Example K 1 l of wastewater refinery composition, mg / l: petroleum 1000; dry residue is 13500, pH - 8.0, 100 mg / l of aluminum sulphate is added. The mixture is stirred for 2 minutes, then flocculant (0.1% solution) is added in an amount of 10 mg / l. After 15 minutes, water is siphoned off and analyzed. Purified water has a pH of 7.5 and contains, - mg / l: petroleum products 0.35; dry% residue 12260. The degree of purification of 99.8.

As flocculant, sodium hydroxide product is saponified by the product of polymerization of wastewater from the production of graft copolymer of acrylonitrile with ethylene-propylene rubber.

Flocculant is obtained by polymerization of wastewater from the production of graft copolymer of acrylonitrile and ethylene propylene rubber of the following composition, mg / l:

PH

Total stiffness

mg-eq / l

Acrylonitrile

5.5-6.5

1.2-3.0 1220-4000 mg / l

SP

О О 4

1C

WITH

Benzoic acid 130-200 mg / l Suspended substances 10-50 mg / l Dry residue 1350-1500 mg / l COD, mg02 / l 11200-35000 mg / in the presence of potassium persulphate and sodium hydrosulfite at 35-40 С

for 3-4 hours. Then the copolymer obtained is treated with alkali at 95-100 ° C for 1.5-2 hours.

15464294

The resulting product is examined by the method of X-ray and DTL. It has the following structure:

R

-CH-CONd CH2 CH3 K

I

sn3-sn-sn-sng-snsnn snn-sns-sns-sns-sns-sns-sns-sns-sns-sns-sns-sns-sns-sns-sns-ss

COONO

where R is 0-SNg-CH-SOSHSOS6N51

R - -CH2-CH -S1C-O -CO-C6H5

CONH

MM - 8, 9.6-1050 (molecular weight).

Physical and chemical properties of the obtained product are as follows:

Appearance and a viscous liquid

%

from pink to cherry color

3-4

97-96 10.0-11.0

1,042-1,050

7.535

Is full

-1-0 8.2., 6-10

COONO

P

0

five

0

five

0

five

In parallel, the wastewater treatment of petroleum products is carried out according to a known method using as hydrofluorized graft copolymer of acrylonitrile and butadiene styrene as flocculant.

Comparative data are presented in Table. one.

From the table it follows that the proposed method allows to shorten the process time by 2 times, while maintaining a high degree of purification of water from oil products.

Claims (1)

Invention Formula The method of purification of waste water from oil products. Including treatment is aluminum sulphate and flocculating with subsequent sedimentation and separation of the formed precipitate, characterized in that, in order to reduce the duration of the process while maintaining a similar degree of purification, sodium hydrated sulphate product is used as flocculation polymerization of wastewater from the production of graft copolymer of acrylonitrile with ethylene-propylene rubber. Famous Proposed 5.0 - 8.0 500.0 13500 30.0 7.0 1.0 12014 99.8 5.0 8.0 500.0 13500 15.0 7.0 0.5 11089 99.9