UA65651U - Method for decontamination of sulphide-alkaline wastes - Google Patents

Abstract

A method for decontamination of sulphide-alkaline wastes includes catalytic oxidation of sulphides by an oxygen-containing reagent under a temperature of 5-. Hydrogen peroxide is used as oxygen-containing reactant. An aqueous solution of phosphonate complex of iron is used as a catalyst.

Description

The disadvantage of the above method is that the problem is solved by the fact that in the case of the catalytic oxidation of hydrogen sulfide and mercaptans, the home-made method of sulfide-alkaline decontamination is carried out before the formation of elemental sulfur. In the data, which includes the catalytic oxidation of the brine, there are problems associated with the strengthening of feeds with an oxygen-containing reagent, at temperature, corrosion of technological equipment and, according to the proposed useful model, such as the release of sulfur with oil In addition, hydrogen peroxide is used as an oxygen-containing reagent, the process is carried out at low temperatures, hydrogen is used as a catalyst, which slows down oxidation, and increasing the temperature of the iron phosphonate complex, and the process of illumination in order to speed up the process needs to be carried out at a temperature of 5-70 70. higher costs of basic and/or alkaline reagents, such as iron phosphonate complex and hydrogen peroxide. salt of ferric iron and phosphono-

In the process of oxidation of spent aqueous tylglycine (imino-M-acetic M-methylenephosphonic sulphide-alkaline solutions, intermediate acids are formed) |IFMGKI, imidodes (methylenephosphonic) oxidation products: thiosulfite, sulfite and polyacids PDFKI, M-hydroxyethylimino-M, M- over there These compounds consume oxygen, therefore, when di(methylenephosphonic) acid (GEI!DFK)I, glycine- these solutions enter water bodies, the concentration of M, M-di(methylenephosphonic) acid (imino-M- dissolved oxygen decreases, which has a harmful effect -M, M-di(methylenephosphonic) acid) affects biological processes in water bodies. To reduce the harmful effects of intermediate products of PDOMFKI acid, nitrile (methylenephosphonic) oxidation, it is recommended to carry out oxidation of INTPFKI acid, ethylenediamine-M, M- to the formation of sulfates, which are not toxic. But di(methylenephosphonic) acid (EDDFKI, ethyl- the process of oxidation of hydrogen sulfide in strongly alkaline ndiamine-M,M'-di(isopropylphosphonic) acid solutions (pHe" or -11) at temperatures of 20-80 C IEDDIFKI, ethylenediamine-M,M ,M',M'-tetra (methyl- and air pressure of 0.1-14 OMpPa is too long even nphosphonic) acid (EDTPKI, ethylenediamine- when using catalysts, due to strio- M,M'-diacetic-M,M' -di(methylenephosphonic) acidification process by oxidation products (Kundo N. loti IEDDFKI, hydroxypropylenediamine-M,M,M!,M1-

N., Keyer N.P. Catalytic action of phthalo-tetra(methylenephosphonic) acid (DPFCI, dihydlocyanines in the reaction of hydrogen sulfide oxidation in roxybutylene-1,4-diamine-M, M.M, M, - aqueous solutions // Kinetics and catalysis - 1970, - triacetic (methylenephosphonic) acid (DBTPKI,

T.11. - Vp.1. - P.91-99). diethylenetriamine-M,M,M!,M-

The method of decontamination of sul-1,4,7,10-tetraazacyclododecane-M,M!,M,M111-fido-alkaline effluents by catalytic oxidation of su-tetra (methylenephosphonic) acid IDOTPKI, 1- ulfides with an oxygen-containing reagent, at a temperature. hydroxyethylidene diphosphonic acid (OEDFKI.

In this method, sulfides are oxidized to sulphides. - the growth of the catalyst - the porous melting pressure and the decrease in temperature of the intergraphite-like material - sibunite, which caused the process. In addition, the useful model allows converting Mag5 to 99.95 95 with selectivity, allows neutralization of sulphide-alkaline effluents according to Ma?5O» - 97 95 and prevents the formation not only from sulphides, but also from mercaptides, which are by-products - sulphite and thiosulfite. (To- found in the alkaline effluents of oil refineries N.M., Batggina M.V., Balzhynimaeev B.S., plants in the range from 10 to 20 mg/l.

Elin OP., Rakhimov H.Kh., Noskov A.S. Oxidizer- The technical result of the proposed useful noe neutralization of alkaline sulphide sto- model consists in reducing energy costs and kov: Dokl. at the 16th All-Russian conference on ensuring the possibility of decontamination of effluents from chemical reactors (Khimreactor-16), Kazan, mercaptides. June 17-20, 2003. // Catalysis in industry, - The proposed method is carried out by 2004 - Special release; P.32-40.) treatment of sulphide-alkaline effluents with an aqueous solution

The method is characterized by significant energy consumption of hydrogen peroxide in the presence of complex them to create oxygen pressure to 1 catalyst - iron phosphonate complex,

MPa, and in terms of air up to 4.8 MPa, and which is obtained by simple mixing of aqueous and also costs for heating and maintaining a high-temperature solution of iron sulfate and aqueous solution of the reaction medium. This phy- of acids taken in a molar ratio causes intensive corrosion of equipment and causes no, at the rate of 1:(0.5-2.0). The oxidation process requires the removal of volatile compounds, which are non-basic at a temperature of 5-70 C, preferably when they can be neutralized before release into the atmosphere. 10-40 "C. Oxidation is constantly controlled by auto-

The basis of the proposed useful model is the task of improving the well-known method of the reaction medium - E mV by measuring the electrical potential. In the process of oxidation-decontamination of sulphide-alkaline effluents, in which the potential of the reaction medium changes by changing the temperature regime of the process from 750-800 mV to 200 mV. When oxidation is achieved, as well as the replacement of the oxidizing and catalytic potential of the environment within 200 catalytic reagents with new, but in themselves mV, the process of oxidation of sulfide-alkaline effluents with reagents known in the art, the possibility of reducing energy costs is provided, excluding the peroxide dosage. hydrogen The method ensures a high level of purification of wastewater from hydrogen sulfide and mercaptides - to the total is dissolved in 50 ml of water and mixed with a solution of sulphide ions in wastewater - up to 96 mg/l of free iron fat - 12.5 g in 50 ml of water. hydrogen sulfide and hydrosulfide ions in terms of up to 50 ml of sulfide-alkaline effluents with a pH of 13.1 5-2, the total content of sulfide ions is reduced by adding 0.05 ml of the prepared catalytic 10-14 times. The highest level of oxidation of the sul-complex and adding 20 9-ion of hydride ions during mixing is achieved when using an aqueous hydrogen phosphonate solution of peroxide (peroxide) to iron sulfate complex with 1- lowering the potential of the environment from 800 mV to 200 mV with hydroxyethylidenediphosphonic acid. The process is carried out at a temperature of 10- (OEDFK). 4076.

The proposed method is explained concretely. With the achievement of a constant value of the potential, this example of the implementation of the method and the schedule of the order - 200mV dosage of hydrogen peroxide, the dynamics of the potential of the reaction medium are stopped. oxidation of sulfide-alkaline effluents with aqueous analysis of sulfide-alkaline effluents before and after their hydrogen peroxide solution in the presence of an oxidation catalyst shows that the sulfide ion content of the free complex of iron sulfate and OEDFC. hydrogen sulfide and hydrosulfide ion in terms of 5-

Example. 2 decreases 14 times - from 13440 mg/l to 96.0 mg/l.

Preparation of the catalytic complex of OEDFK with iron sulfate: take 10.3 g of OEDFK solution

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State Intellectual Property Service of Ukraine, st. Urytskogo, 45, Kyiv, MSP, 03680, Ukraine

SE "Ukrainian Institute of Industrial Property", str. Glazunova, 1, Kyiv - 42, 01601