SU1592018A1

SU1592018A1 - Absorbent for cleaning gases from sulphur dioxide and hydrogen sulphide

Info

Publication number: SU1592018A1
Application number: SU884438292A
Authority: SU
Inventors: Vyacheslav A Fomin; Tatyana I Komleva; Akhmatfail M Fakhriev
Original assignee: Vnii Uglevodorodnogo Syrya
Priority date: 1988-04-11
Filing date: 1988-04-11
Publication date: 1990-09-15

Description

The invention relates to the absorption-catalytic purification of gases from sulfur dioxide and hydrogen sulfide to obtain elemental sulfur. The purpose of the invention is to increase stability

The invention relates to the absorption-catalytic purification of gases from sulfur dioxide and hydrogen sulfide to obtain elemental sulfur and can be used in gas, oil, oil refining and petrochemical industries.

The aim of the invention is to stabilize the activity of the absorbent.

Example 1. The absorption solution is prepared by dissolving the components in dimethylformamide. 50 g of distilled water is added to 940 g of dimethylformamide (DMF) with stirring, and then 10 g of Ν, Ν-dimethylaminopropionitrile (DMPN) are dissolved. The absorption solution prepared in this manner contains 1% DMPN, 5% water and the rest DMF. In a similar manner, absorbing solutions of the compositions given are prepared.

2

catalytic activity of the absorption solution while maintaining its low corrosivity. Absorption solution for gas purification / of sulfur dioxide and hydrogen sulfide includes organic base, water and dimethylformamide, which contains Ν, иметdimethylaminopropionitrile as an organic base in the following ratio of components, wt.%:,-Dnmethylamine propionitrile 0.5-1.5; water 0.2-10.0; dimethylformamide else. The proposed absorbent for 20 h does not reduce its activity, providing a 100% degree of purification from 502 and 99.0-99.8% degree of purification from H ^ S. 2 tab.

in the claims. The proposed использованию,-dimethylaminopropionitrile (DMPN) has a high boiling point (173 ° C), relatively low volatility and less toxicity (LDK-1 0 mg / m ³ ), which ensures its loss and safety measures. и p and me 2. Gas removal from sulfur dioxide and hydrogen sulfide is carried out in a laboratory installation with a reactor, which is a glass bubble column with a diameter of 32 and a height of 800 mm .. In the lower part of the reactor through a porous plate at atmospheric pressure with speed 12.6 l / h serves the gas to be purified, containing, vol.%: Sulfur dioxide 0.85, hydrogen sulfide, 1.70, and the rest nitrogen. In the upper part of the reactor the circulation gas is 810262 G "7) 5

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At a speed of 1, 34 l / h, an absorption solution of a certain composition is fed (see Table 1). In a bubble reactor at a temperature of ~ 40 ° C, the absorption of sulfur dioxide, hydrogen sulfide and their interaction in the medium of the absorption solution occurs with the formation of elemental sulfur by the reaction

80 ₂ + 2H _{2 August} -► 38 + 2H ₂ O. ^'10

Forming crystalline sulfur is removed from the bottom of the reactor along with the circulating solution and is separated from the solution by filtration. After the separation of sulfur, the absorption solution by the circulating pump is returned to the reactor for reuse. At the inlet and outlet of the reactor, the gas mixture is periodically analyzed for the content of sulfur dioxide and hydrogen sulfide using gas chromatography using an LCM-80 instrument.

The results of the experiments are given in table. 1. Here, for comparison, 25 are the results of gas purification from sulfur dioxide and hydrogen sulfide under identical conditions, but using a known absorption solution (experiments (G 6-8). T

Example The gravimetric method on an autoclave unit measures the corrosion rate of StZsp steel in the environment of the spent absorption solution at a temperature of 30 and 50 ° C. The compositions of the tested absorption solutions and the averaged results of determining the corrosion rate are given in table. 2. For comparison, the results determined Lenia ¹ StZsp steel corrosion rates in the conditions described above in a medium known scavenger solution (experiment № 4).

From the table. 1 data shows that use in composition

In the initial period of operation (after 10 hours of testing), the absorptive solution DMPN provides the same degree of purification of the gas mixture from hydrogen sulfide and sulfur dioxide as compared with the known composition of the absorption solution. With long-term testing of 15 and 20 hours, the use of DMPN provides a higher degree of purification of the gas mixture from hydrogen sulfide (by 12.6 and 14.3 rel.%) And sulfur dioxide (by 12.9 and 14.7 rel.%) Compared to with a known composition, i.e. The proposed absorption solution provides a long-term consistently high degree of gas purification from sulfur dioxide and hydrogen sulfide, which indicates an increase in the stability of its catalytic activity in comparison with the known.

From the table. 2 data shows that the absorption solution of the proposed composition, similarly known, has a low corrosivity with respect to carbon steel. Moreover, at an elevated temperature (50 ° C), the corrosion rate of carbon steel in the medium of the proposed absorption solution is significantly (20 times) lower than in the medium of the known absorption solution.

Claims

Claim

Absorbent for the purification of gases from sulfur dioxide and hydrogen sulfide to obtain elemental sulfur, including organic base, water and dimethylformamide, characterized in that, in order to stabilize the activity of the absorbent, it contains основания, Ν-dim'methylaminopropionitrile in the following ratio of components , wt.%:

Ν,-dimethylaminopropionitrile 0.5-1.5

Water 0.2-10.0

Dimethylformamide Else

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Table 1

Experience, № The composition of the absorption solution, May.? Degree of cleaning, rel.? through 10 h 15 h 20 h Η ₂ δ) δθ ₂ n _g s | zo ₂ H ₂ 3 ) 3 ° 2 one DMPN 0.5 N ₂ 0 1.5 DMF the rest 99.1 100 99.2 100 99.0 100 2 DMPN 1.0. H ₂ 0 7.0 DMF the rest 99.7 100 99.9 100 99.8 100 3 DMPN 1.5 NgO 5 DMF the rest 99.8 100 99.7 100 99.8 100 · four DMPN 0,25 N ₂ 0 7, about DMF the rest 98.2 100 98.0 100 98.1 100 five DMP 2,0 N ₂ 0 9,0 DMF the rest 99.8 100 99.6 100 99.7 100 6 Dimethylamine 0.04 99.5 100 85.9 86.5 84.5 85.1

H _g O 2

DMF the rest

7 Dimethylamine 0.5 N ₂ 0 4 DMF the rest 99.6 100 86.6 87.1 84.7 85.3 eight AMEN 0 86.3 87.1 85.6 85.9 84.4 84.9

H ₇ 0 5

DMF the rest

table 2

Experiences, The composition of the absorber- Tempera- Test time Speed No foot solution, may.? tour, ° C tany, h corrosion mm / year one DMPN 0.5 thirty 504 0,0025 water 5.0 DMF rest 50 331 0,0033 2 DMPN 1.0 thirty 504 0,0019 water 10.0 DMF rest 50 331 0,0031 3 DMPN 0.1 50 331 0.5899 water 5.0 DMF rest four Dimethylamine 0.04 thirty 504 0,0029 water 10.0 DMF rest 50 331 0.0778

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