SU1680285A1 - Method for trapping vapours of hydrogen-sulfide-containing oil - Google Patents

Description

The invention relates to the purification of gases and can be used in the oil and gas industry. The aim of the invention is to reduce the content of hydrogen sulfide in the gas and the reduction of corrosion

. fluid activity. In the hydrogen-sulfur-containing gas selected from the raw material production, the Invention relates to the purification of gases and can be used in the petrochemical and petroleum refining industries.

The purpose of the invention is to reduce the content of hydrogen sulfide in the gas and reduce the corrosivity of the liquid.

Example. Experiments on the method and the proposed method are carried out at a pilot plant, controlling the quality of the gas produced and the aggressiveness of the working fluid (absorbent). When testing the method using the following reagents: CUT (GOST 10652-73), ferric sulfate (GOST

2

Zervuar, before entering the entrance to the ejector enter the air in the amount determined, from the equation Ov = 0,0063 Cis * Op. where Ov is the volume flow rate of air introduced in pairs, m ³ / h; About _p - the number of vapors, m ³ / h; SNGS - hydrogen sulfide concentration in pairs, g / m ³ . The vapor-air mixture together with the liquid, which uses an aqueous solution containing the complex ferric iron salt and ethylenediaminetetraacetic acid, is fed into the mixing chamber of the ejector. After the ejector gas-liquid mixture is fed to the separator, where it is divided into gas, condensate, sulfur and absorbent. The purified gas, condensate and sulfur ~ are fed to the consumer, and the absorbent is recycled to the ejector. The purified gas contains 0.015 g / m ^{3 of} hydrogen sulfide, and the pH of the ejector liquid is 8.8-9.2. 1 tab.

9485-75), associated petroleum hydrogen sulfide gas. An aqueous solution of the complex salt and Her ³ ethylenediaminetetraacetic acid by mixing the following composition: EDTUK200t / l, Fe ₂ (5O4) of 100 g / l, № SOz200 ₂ g / l, the rest water, pH 8.8-9.2, density 1.23 g / l.

In pairs of hydrogen sulfide-containing oil from the raw material reservoir with a flow rate of 2 m ³ / h, containing hydrogen sulfide in an amount of 30 g / m ³ under a pressure of 0.102 MPa, air is supplied in an amount of 0.38 m ³ / h before entering the reception of the ejector.

The amount of air is calculated by

formula

51),. ,, 1680285 A1

3 1680285 4

Ωβ “0.0063 · Сн _х 5 · Ω _π , where Ωβ is the volume flow rate of air introduced into the vapors taken from the tank, m ³ / h,

Ωπ ~ the number of hydrogen sulfide-containing vapors taken from the tank, 5 m ³ / h,

Ch25 ~ concentration of hydrogen sulfide in the vapors taken from the tank, g / m ³ .

As a result of the mixing of vapors of hydrogen sulfide-containing oil with the absorbent and 10 air in the mixing chamber of the ejector, absorption of hydrogen sulfide and regeneration of the absorbent occur.

Then the gas-liquid mixture from the ejector is fed to the separator, where it is stratified into gas, condensate, sulfur and absorbent. Absorbent regenerated in the chamber of the ejector with pH = 8.8-9.2 from the separator is again fed to the entrance of the ejector. The content of hydrogen sulfide in the purified gas is determined by the chromatographic method. The residual 20 content of hydrogen sulfide in the purified gas is 0.015 g / m ³ , which meets the requirements

The results obtained when testing the known and proposed methods are given in the table,

The proposed method provides high efficiency of purification from hydrogen sulfide (content of 0.015 g / m ³ against 29-30

ABOUT

mg / m according to the prototype) when trapping oil-containing hydrogen sulphide vapors. Corrosion is also excluded.

functioning equipment and the need for additional installations for cleaning ketase and absorbent regeneration by a known method.

Claims (1)

Claim A method for trapping vapors of hydrogen sulfide-containing oil from tanks, including pumping vapors by a liquid ejector, dividing the resulting gas-liquid mixture into a working fluid, gas and condensate, and returning the fluid to the ejector, 15 o tl and h ay.s. in order to reduce the hydrogen sulfide content in the gas and reduce the corrosivity of the liquid, air is supplied in pairs at the inlet to the ejector in an amount determined from Ωβ = 0.0063'Sngs' Ωπ where Ωβ is the flow rate of air introduced in pairs, m ³ / h; Ω _π - the number of vapors, m ³ / h; H25 - hydrogen sulfide concentration ^ in pairs, g / m ³ , and an aqueous solution containing complex ferric salt and ethylene diaminete of raacetic acid is used as a liquid. thirty The name of indicators Proposed Famous (prototype) Prototype note Gas flow rate, m ³ / h 2.0 2.0 The hydrogen sulfide content in the gas to be purified, g / m ³ thirty thirty pH of the working fluid of the ejector after absorption 8.8-9.2 4.5 Corrosion of process equipment, premature hydrogen sulfide Sour minor wear The hydrogen sulfide content in Requires additional treatment for purified gas 0.015 29-30 general installations