SU1472102A1 - Method of removing hydrogen sulphide from gas - Google Patents

Abstract

The invention relates to methods for the purification of gas from hydrogen sulfide. Cleaning lead in two stages. In the first stage, the hydrogen sulphide gas is treated with an acidic solution (PH 3.6-5.6) containing thiosulfate, while about 50% of the original hydrogen sulfide is oxidized to sulfur, which is separated from the solution. In the second stage, the hydrogen sulfide gas is treated with an ammonia solution (PH 7.0-10.5). The hydrogen sulfide absorbed in the second stage is oxidized with oxygen-containing gas to thiosulfate, and a suspension of elemental sulfur in the amount of 3.0–60.0 moles per 1 mole of hydrogen sulfide fed with the gas to the second stage is used as a catalyst. After the pH is adjusted to 3.6-5.6, the solution is recycled to the first stage. The change in PH of the absorption solution is carried out by feeding or distilling off the ammonia. The method allows to obtain sulfur with a yield of 100%, while reducing energy consumption by 2.46 times and simplifying the process. 1 il.

Description

one

The invention relates to the purification of gas and can be used in the chemical, gas, metallurgical and other industries.

The aim of the invention is to reduce energy costs and simplify the control of pro-. Cessa.

The drawing shows the implementation of the proposed method.

The method is carried out as follows.

Example 1. Hydrogen sulfide-containing gas is fed to reactor 1, where it is treated with an absorption solution containing thiosulfate fed from reactor 2 through column 3. The temperature of the solution in the first stage of contact (reactor 1) is 50-90 ° C, pH 3.6-5.6 . About 50% of the original hydrogen sulfide is oxidized with thiosulfate to elemental sulfur.

2H2S + S20.32- - 4SO + H20 + 20H-.

The solution exiting reactor 1 is divided into two parts. A large portion is fed to the second stage of contacting the reactor 2. A smaller portion containing an amount of sulfur equal to that formed by the reaction between hydrogen sulfide and thiosulfate is fed to filter 4, sulfur is removed, the filtrate is fed to reactor 2. The gas leaving reactor 1, fed to the reactor 2, where the residual hydrogen sulfide is absorbed by the alkaline absorption solution with a temperature of O-60 ° C and pH 7.0-10.5. The absorbed hydrogen sulfide is oxidized with air fed to reactor 2. The catalyst for oxidizing hydrogen sulfide to thiosulfate is a suspension of elemental sulfur. The sulfur content of 3.0-60.0 moles per 1 mol of hydrogen sulfide entering the second stage.

An ammonia solution containing thiosulfate from reactor 2 is fed to column 3, where the reaction water and ammonia are distilled.

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clocks with absorption solution at pH 70 and temperature 20 ° С, containing suspension of elemental sulfur 1.56 mol / l, tri-ammonium phosphate 1.0 mol / l, diammonium phosphate 1.0 mol / l. The degree of gas purification from hydrogen sulfide is 100%. At the same time, air is bubbled through the solution at a rate of i-. The first, (; tolpane absorber, to obtain a solution with a pH of 3.6-5.6, which is recycled to reactor 1. Ammonia from column 3 is returned to reactor 2 to maintain the pH of the solution at 7.010 5

 Gas containing, vol. %: H2S 10, C02 30, I oocyte. img .--- H, 5; N. 55, at a rate of 1 - / J ayutR "" P P Absorbed absorber in the reactor 1 with a volume of 1.3 liters and Orootuyu ", hydrogen sulfide is oxidized to dry

if -jr T-3r ocSJ, „-„ e-; n 47 H ™ Ls; 5s2s 11 tGoG to:: Ta ± o „s

ding the contacting solution containing give ojro solution is distilled off

1,828 .OLO elemental, rshod t and affairs all over J --Y, tka, which return

per 2 streams: one with a volume of 854.4 ml (including p / maintenance

; -7g; yy; about ™ gig: G ™ „1; GF ™ g; .to gl eGo; g; 5 re4ku.-ru-, b: - ;, „yr„ zZs

stzii

Gas after cleaning in the first stage, containing 5.25 vol. % hydrogen sulfide, po .. /: ;; p; YY; Tast7-7-77 containing

 “Yes-rr: oLy.f ™ n: p1; s;, rGee G o9.3. ss:

1.56 mol / lithriammonium phosphate 2 mol / l. 25 Q 67 mol of elemental sulfur. The degree of gas purification from hydrogen sulfide is 100/0. containing u, j „„ „„ „l. ,,.

Oapovremeppo air is bubbled through the solution at a rate of 5 l / min. The sulfur absorbed absorbed by the absorption solution is oxidized to ammonium thiosulfate.

. .ГГ „, п П PC7 mppk ТИО Circulate Into the reactor i ucpo. Example 3. Gas containing, about. : Ngb 10- GO., 40-H9 5- N9 55, with a speed of 0.11 l /

, 4.ss

containing - and, and / iv,., -.....-- -, are withdrawn and divided into 2 streams: one of the 7152 MP dumps is directly transferred to the second stage reactor, and 286.0 ml fall on filter 4 for retrieval. Filtrate

The prenod is oxidized to - Uf ammonium. ... j stage. Within an hour, 0.067 mol of thio-30 .J purification is formed on the first n. L., Nn, .o ,, / TPP 9 nacTBOD. containing gas after cleaning on and

b for one hour uupao i, - sulfate. From the reactor 2 a solution containing thiosulfate is fed to the distillation of ammonia and reaction water. 4 g / mol of ammonia is distilled off from 1 l of the solution, which is returned to the reactor of the second stage to support 0 / 2O /. P1 KNPPVYU VYOl, aJUl pean-iv t .... after cleaning in the first stage, containing 5.26 o . % of hydrogen sulfide enters the reactor of the second stage 2, where it is in contact with an alkaline absorption solution at pH 8.0 and a temperature of 20 ° C; . „ЛЛ г lgch1-t I I D MPL / .P I

“Reactor of the second stage to support - Serg 0, G“ ol / l and

G kyzr / cGy :: - “ф5ф-г„ ±.

recycle to the first-stage reactor 1. The use of the proposed method reduces the energy consumption for the distillation of ammonia from the absorption solution by 2.46 times, as well as simplifies and reduces the cost of the process by eliminating the operation of analytical control of the condensate. ..i.,. 4, - -v, -., .. 0 /

The degree of gas purification from hydrogen sulfide lOU / o. At the same time air is bubbled through the solution at a rate of 0.56 l / 1, w. The hydrogen absorbed by the sulfur-0 absorption solution is oxidized to ammonium thiosulfate. Within nine hours, 0, O7 mol of thiosulfate is formed. From the reactor 2 a solution containing thiosulfate is fed to the distillation. .u .....-- g "l O /. N Q m i K and the reaction water in the column o. of

Example 2. Gas containing, about. /about. H.S HGp of the terminal distills off 4 g / mol of ammonia,

; v °; t P.7 o g: l ;; g ± d1, 3 l and bubbled through 1 l of the Solution and the resulting acidic solution

 GG e.rcj,, „er. ™.

sulfur 1.56 MOL / L, at 90 ° C and pH 4.0. From Reac / fn Solo I 5 No. 55, with a speed

This is the first one and contacting the growth 50 f;

a thief containing 1 / mol of the I / I and OG topp gpdrpjasery is removed and divided into two streams: one with a volume of 854.4 ml is directly transferred

to the second stage reactor, and 146 ml. are given --- 2Т: 7HP 90X and pH 4.0: From the reaction to filter 4 to extract sulfur. The filtrate of the PbJ diya contacting the plant is fed into the reactor at a stage of V stage, 51 moles of elemental sulfur.

The gas after .ppg is mixed and divided into two streams: one with a volume of 920.2 ml is fed to the reactor of the second standard l / min and fed to peaKiup d -, - and bubbled through 1 l of a solution containing ammonium thiosulfate 1.85 mol / l, monoammonium phosphate 2 mol / l, elemental

ildoil U -.t.iV-l - Il -...---,

containing 5.26 vol. % hydrogen sulfide, enters the reactor 2 of the second stage, where it is in contact with the absorption solution at pH 70 and temperature 20 ° С, containing suspension of elemental sulfur 1.56 mol / l, tri-ammonium phosphate 1.0 mol / l, diammonium phosphate 1.0 mol / l. The degree of gas purification from hydrogen sulfide is 100%. At the same time, air is bubbled through the solution at a rate of i-. I l, chgl (; tlpna nyi absorber-aeromatch. Aim .--- P «« P P Absorbed absorber P ° Q 67 mol of elemental sulfur. Containing u, j „„ „„ „l. ,,.

containing - and, and / iv,., -.....-- -, are withdrawn and divided into 2 streams: one of the 7152 MP dumps is directly transferred to the second stage reactor, and 286.0 ml fall on filter 4 for retrieval. Filtrate

 ... j stage. .J cleaning on the first with gas after cleaning on and

... j stage. .J cleaning on the first with gas after cleaning on and

l, aJUl pean-iv t .... after cleaning in the first stage, containing 5.26 vol. % of hydrogen sulfide enters the reactor of the second stage 2, where it is in contact with an alkaline absorption solution at pH 8.0 and a temperature of 20 ° C; . „ЛЛ г lgch1-t I I D MPL / .P I

  G serG 0, G "ol / l and

:: - “ф5ф- г„ ±.

 f;, ayu t to factor l of 1.3 liters

i / „og topp gpdrpja --- 2T:: 7HGhp at 90X and pH 4.0: From the reaction of PbJ diy contacting plant, Vs, 51 mol of elemental sulfur.

1 l / min is fed to peaKiup d -, - and sparged through 1 l of a solution containing 1.85 mol / l of ammonium thiosulfate, 2 mol / l of monoammonium phosphate,

days, a second volume of 81 ml is fed to filter 4 for sulfur recovery. The filtrate is fed to the second stage reactor.

Gas after cleaning in the first stage contains 2.1 vol. % hydrogen sulfide (80% of the original hydrogen sulfide is oxidized in the first stage), enters the second stage reactor 2 where it contacts an alkaline absorption solution at pH 8.0 and a temperature of 20 ° C containing elemental sulfur suspensions

ammonium thiosulfate. At the same time, thiosulfate and from elemental sulfur is formed. Within two hours, 0.094 mol of thiosulphate from hydrogen sulfide and 0.4 mol of thiosulphate from elemental sulfur are formed. From the reactor 2, the solution containing the thiosulfate is fed to the distillation of ammonia and the reaction water in column 3. From 1 l of the solution is distilled 5 g / mol of ammonia, which is returned to the second-stage reactor, and

3.24 mol / l and triammonium phosphate 2 mol / l o, 268 g / mol of water, which is extracted from sys-So / H2S 60.0. The degree of gas cleaning from the gray-threads. The resulting acidic solution is recycled to the first stage reactor.

The reduction of energy consumption in the proposed method compared with the prototype

Within 3 hours, 0.1072 mol of thiosulfate is formed. From the reactor 2, the solution containing thiosulfate, served on the distillation of ammonia

from the system. The resulting acidic solution is recycled to the first stage reactor. Example 5. Gas containing, vol. %: H2S 10; CO2 30; H2 5; N2 55, at a rate of 1 l / min, is fed into the reactor 1 with a volume of 1.3 l and it is bubbled through 1 l of a solution containing 1.55 mol / l ammonium thiosulfate.

hydrogen 100%. At the same time air is bubbled through the solution at a rate of 1.67 l / min. Hydrogen sulfide absorbed by the absorption solution is oxidized to. occurs at the stage of distillation of ammonia from ammonium thiosulfate. Simultaneous treatment solution, before serving

is thiosulfate and from elemental sulfur. from the second stage to the first. Insofar as

in the proposed method, in the second stage, solutions with a pH of 7.0-10.5 are used, and in the prototype, 11.0-13.0, and in the first stage, the values of the reaction water in the column 3. Of the 20 solutions are not the solution is distilled 4 g / mol of ammonia, and the amount of ammonia distilled

which is returned to the reactor second sta-out of solution, for the proposed method

di, and 0,268 g / mol of water, which output less than for the prototype. Power consumption

for both processes, the optimal values of the mixes are 33320 and 82114 kcal per 1 m of solution, i.e., in the proposed method they are reduced by 2.46 times. In the proposed method, the catalyst is elemental sulfur, an irreversible catalyst that is not used, and ammonium phosphate 2 mol / l, elemental sulfur — which does not require 1.16 mol / l, at 90 ° C and pH 4.0. A solution containing 1,828 mol of elemental sulfur is removed from the reactor of the first stage of contact and divided into two streams: one with a volume of 854.4 ml is transferred to the reactor of the second stage, and 146.8 ml is fed to filter 4 for 35 of which includes its contacting with sulfur thiosultivation. The filtrate is fed to the reactor-containing solution at pH 3.6–5.6,

separating elemental sulfur from the absorption solution, washing the gas with an ammonia absorption solution, treating this solution with oxygen-containing gas to form thiosulphate, distilling ammonia from the solution after the washing stage, and returning the solution to the contacting stage, which in order to reduce energy costs to the ammonia absorption of gas cleaning from hydrogen sulfide 100%. The one-solution solution is introduced; elemental suspension is temporarily air-bleeding is bubbled through the solution in an amount of 3-60 moles per 1 mole.

hydrogen sulfide in the gas supplied to the washing, and the latter is carried out at a pH of 7.0-10.5.

complex analytical control.

Claims (1)

The invention of the method of purification of gas from hydrogen sulfide. second stage. Gas after cleaning in the first stage, containing 3.64 vol. % hydrogen sulfide, enters the reactor 2 of the second stage, where it is in contact with an alkaline absorption solution at pH 10.5 and a temperature of 20 ° C, containing suspension of elemental sulfur 1.56 mol / l, triammonium phosphate 2 mol / l and ammonium hydroxide 1 mol / l . Power 40 at a speed of 20 l / min. Hydrogen sulfide absorbed by the absorption solution is oxidized and ammonium thiosulfate. At the same time, thiosulfate and from elemental sulfur is formed. Within two hours, 0.094 mol of thiosulphate from hydrogen sulfide and 0.4 mol of thiosulphate from elemental sulfur are formed. From the reactor 2, the solution containing the thiosulfate is fed to the distillation of ammonia and the reaction water in column 3. From 1 l of the solution is distilled 5 g / mol of ammonia, which is returned to the second-stage reactor, and  o, 268 g / mol of water that is withdrawn from the system. The resulting acidic solution recirculated. Method compared with the prototype  occurs at the stage of distillation of ammonia from the absorption solution, before serving this eliminates the need to conduct contacting it with a thiosulfate-containing solution at pH 3.6–5.6, complex analytical control. The invention of the method of purification of gas from hydrogen sulfide. At the atmosphere reptile cleanser