LU82716A1 - METHOD FOR REMOVING SULFUR HYDROGEN FROM GASES, ESPECIALLY CARBON DISTILLING GASES - Google Patents

Description

D. 51,213

--82 / 1 C $, D-DUCHÉ DE LUXEMBOURG

Certification N ° .............................................

du 14 août 19.8o ._____________ ^ Monsieur le Ministre. 1¾¾ de l’Économie Nationale et des Classes Moyennes

Titre delivre: ........................................ 3ÏS

Service de la Propriété Industrielle wÂy LUXEMBOURG

Demande de Brevet d'invention I. Requête Ta «ocigfcg altes ..... Dr ....... C ...... OTTO & COMP. Society with limited (1) liability, Christstrasse 9, à 463o BOCHUM 1, Allemagne Fédérale, représentée par Monsieur Jacques de Muyser, agis- ...... (2). sant ... en qualité de mandataire______________________________________________________________________________________________________________________________________ déposece ..... quatorig.e ... aoQt 19oo quatre-vingt ......................... ...................... (3) à _JL5L .......... ... heures, au Ministère de l'Économie Nationale et des Classes Moyennes, à Luxembourg: 1. la présente requête pour l'obtention d'un brevet d'invention concernant: »ancestors for the removal of hydrogen sulfide from gases, (4) tns-specific carbon distillation gasesw .____________________________________________________________________________________________________ déclare, en assumant la responsabilité de cette déclaration , que l '(es) ïnventeur (s) est (sont): Hnrat ritter ...... Bercrebuschstrasse 12 ...... à 43oo ESSEN, Allemagne ........... (5 ) .... Fédérale ............................................ .................................................. .................................................. ....... .................................................. ....................................

2. la délégation de pouvoir, datée de ......................................... ........ le ........

3. la description en langue ........ ^. Ll. * ^. §:? Ld® ........................ ............ de l'invention en deux exemplaires; 4 ............ 1 ................. planches de dessin, en deux exemplaires; 5. la quittance des taxes versées au Bureau de l'Enregistrement à Luxembourg, le ..... 14 ........................... .................................................. .................................................. .................................................. .................................................

revendique pour la susdite demande de brevet la priorité d'une (des) demande © de (6) ...................... Jareset ...... ........................................ déposée © en (7) .... ..................................................

le 16 août..191.9 ........... (No, P 2.9 .... 33 147..3) .................. .................................................. ................................................. ( 8) 'au nom de ......... ld .... dépOS, ante ........................... .................................................. .................................................. .................................................. ....... (9) élit domicile pour lui (elle) et, si désigné, pour son mandataire, à Luxembourg ...................... ..................

..... 3.5 .. / ...... bld * ...... Royal .......................... .................................................. .................................................. .................................................. ..................._........... do> sollicite la délivrance d'un brevet d'invention pour l'objet décrit et représenté dans les annexes susmentionnées, - avec ajournement de cette délivrance à .............. Il ....................... ..mois.

"Le ..... jsan & atair.ei .......................!, * ........... X .. ............ X, ................

H. Procès-verbal de Dépôt

La susdite demande de brevet d'invention a été déposée au Ministère de l'Économie Nationale et des Classes Moyennes, Service de la Propriété Industrielle à Luxembourg, en date du: 14 août 19So ^ '"Γ- -; -" "-" .. pr. le Ministre ..,, à ......... 15 ........... heures / de l’Économie Nationale eHdes ^ Ciasses Moyennes, l ίοκ. // (cçm \\ fÿ?

Md i {A BS007 1 »~ 1¾ jf / __ D. 51.213

DEMANDING PRIORITY

| the patentΙΟβφφ ./- application i r "........................

! IN: THE FEDERAL REPUBLIC OF GERMANY

| ...... "-----! From: AUGUST 16, 1979 -

UOOOsSJ

PATENT APPLICATION

in

Luxembourg I Applicant: Dr. C. OTTO & COMP. Company with limited liability

Re: "Process for removing hydrogen sulfide from I gases, especially coal distillation gases".

| ! r - 2 -

Process for removing hydrogen sulfide

Gases, especially coal distillation gases ---—-

The invention relates to a process for removing hydrogen sulfide from gases, in particular coal distillation gases, in which the gas is washed with a circulating washing liquid, the Na-5 tron or potassium hydroxide solution, preferably about 3 to 5% NaOH

contains, with a partial stream being branched off from the circuit and being subjected to workup.

From DE-OS 2 505 959 it is known to supply the washing liquid removed from the circuit to an ammonia stripper for the purpose of aborting the 10 fixed ammonium salts.

With this method it is possible to decompose the fixed ammonia compounds contained in the ammonia water to such an extent that no fixed ammonium salts are present in the waste water. In the known method, the sulfur-15 hydrogen sulfide is expelled from the circulating wash liquid with a flue gas containing CO 2.

In the known method, in which the partial stream branched off from the washing liquid is the ammonia stripper. supplied, it can not be avoided that in addition to Y * V · w 20 hydrogen sulfide also CO 2 and HCN are removed, so that the degree of desulfurization is not particularly high. The reduction is about 0.5 to 0.8 g E ^ S / m n coke oven gas. It is also not possible to add more sodium hydroxide solution to the washing circuit, since otherwise sodium sulfite would be found in the waste water after the abortion. This is due to the fact that the sodium sulfite is only broken down if, for example, chlorides, sulfates or cyanides are present.

The invention has for its object to improve the level of desulphurization of the known methods.

W * r - 3 - \

Starting from a method of the type described in the introduction, the invention consists in that the branched-off partial stream is not passed to the stripper but to a stripper in which the sulfide is driven off from the compound with steam and carbonic acid, so that sodium or. Potassium carbonate is formed and the aqueous carbonate solution, the temperature of which is about 100 ° C, is reacted with a stoichiometric amount of milk of lime to form sodium or potassium hydroxide and calcium carbonate, whereupon the calcium carbonate which precipitates during the reaction is separated and the NaOH or KOH solution is again applied to the i ^ S washer.

The invention further provides that the vapors released in the stripper are partially condensed and added to the coke oven gas before entering the H ^ S washer.

With the method according to the present invention, it is possible to desulfurize the coke oven gas to such an extent that the very strict requirements of environmental protection are met. On the other hand, it is possible to recover almost completely the sodium hydroxide solution added to the washing liquid, since the conversion of the aqueous sodium carbonate solution with the lime milk is about 99%.

An exemplary embodiment of the invention is shown in the drawing. The coke oven gas is fed via line 1 to the H2S scrubber 2, in which it is largely freed of HjS with ammonia water. The ammonia water is fed via line 3, the wash water enriched with H ^ S is drawn off via line 4 and introduced into a deacidifier, not shown. It is driven off by water vapor or together with NH ^ vapors from an ammonia stripper H2S and C02. The deacidified washing liquid is circulated via line 3 in u / '- 4 -.

Iden I ^ S washer returned-

In the upper part of the ^ S washer, the treatment is carried out with a circulating NaOH solution which is fed in via line 5 and is circulated via lines 6 and 57. From this circuit, a partial stream is continuously branched off via line 8 and, after passing through a heat exchanger 9, is fed to the upper end of a stripper IO, in the lower part of which steam and CC> 2 are introduced via line 11 ^ 10.

The sodium carbonate solution running out of the stripper passes via line 12 into a container 13 which! is equipped with an agitator and the one

Line 14 calcium oxide (CaO) is added. The solution which runs out of the 15 container 13 via the line 15 and which consists of an aqueous NaOH solution and calcium carbonate passes into a settling or decanting container 16 in which the solid components are separated off and fed to a sludge treatment via the line 17 are added, while the aqueous NaOH solution is added via line 18 through heat exchanger 9, optionally a further cooler 19 and a filter 20 to the washing liquid which is circulated, and via line 5 back into the H Washer arrives.

ί | 25 The vapors emerging from the stripper are released into the coke oven gas before entering the first washing stage of the

Washer added via line 21 after passing through a condenser 22.

L

Claims (2)

1. A process for removing hydrogen sulfide from: gases, in particular carbon distillation gases, in which the gas is washed with a circulating scrubbing liquid which contains caustic soda or potassium hydroxide solution, preferably about 3-5% NaOH, before C--5. wherein a partial stream is branched off from the circuit and is subjected to a workup, characterized in that the branched partial stream is passed into a stripper in which the sulfide 10 of the compound driven off with steam and carbonic acid: so that sodium or potassium carbonate is formed and that the aqueous carbonate solution, the temperature of which is about 100 ° C, with a stoichiometric amount of lime! milk is converted to sodium or potassium hydroxide and calcium carbonate, whereupon the calcium carbonate which precipitates in the reaction is separated off and the NaOH or KOH solution is again applied to the ^ S washer. 2. The method according to claim 1, characterized in that the vapors released in the stripper are partially condensed 20 and added to the coke oven gas before entering the H2S washer. V ^ XJvX.kV '