PL143567B1 - Method of oxidating hydroquinone in alkaline aqueous solutions during desulfurization of gases - Google Patents

Method of oxidating hydroquinone in alkaline aqueous solutions during desulfurization of gases Download PDF

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PL143567B1
PL143567B1 PL25234885A PL25234885A PL143567B1 PL 143567 B1 PL143567 B1 PL 143567B1 PL 25234885 A PL25234885 A PL 25234885A PL 25234885 A PL25234885 A PL 25234885A PL 143567 B1 PL143567 B1 PL 143567B1
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Poland
Prior art keywords
hydroquinone
oxidation
alkaline aqueous
sodium
aqueous solutions
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PL25234885A
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Polish (pl)
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PL252348A1 (en
Inventor
Krystyna Dowbor
Michal Szelagowski
Magdalena Jaczewska
Wanda Bielawska
Danuta Szawaryn
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Inst Gornictwa Naftowego I Gaz
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Priority to PL25234885A priority Critical patent/PL143567B1/en
Publication of PL252348A1 publication Critical patent/PL252348A1/en
Publication of PL143567B1 publication Critical patent/PL143567B1/en

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Description

Przedmiotem wynalazku jest sposób utleniania hydrochinonu w alkalicznych roztworach wodnych podczas odsiarczania gazu. Znajduje on zastosowanie przy odsiarczaniu gazu weglowego i koksowniczego.Dotychczas znany sposób utleniania hydrochinonu w alkalicznych roztworach wodnych podczas odsiarczania gazu polega na tym, ze zawarty w roztworze chinon utlenia wystepujacy w gazie siarkowodór do siarki elementarnej, a nastepnie zredukowanajego postac utlenia sie ponow¬ nie do chinonu tlenem molekularnym zawartym w powietrzu. Czas potrzebny do przebiegu reakcji utleniania chinonu wynosi 30 do 60 minut - Dlugi czas utleniania hydrochinonu powoduje wzrost gabarytów instalacji do odsiarczania gazu oraz zwiekszenie ilosci cyrkulacyjnego roztworu alkalicznego, a przez kontakt jonów siarcz¬ kowych z tlenem zwieksza sie równiez ilosc powstajacych scieków gazowniczych.Sposób wedlug wynalazku polegajacy na utlenianiu wystepujacego w gazie siarkowodoru do siarki elementarnej przez chinon znajdujacy sie w alkalicznym roztworze wodnym i utlenianiu hydrochinonu do chinonu tlenem molekularnym zawartym w powietrzu, charakteryzuje sie tym, ze proces utleniania hydrochinonu w roztworze o pH 6,5 do 9,0 prowadzi sie w obecnosci katalizatora w postaci soli chelatowych zwiazków zelaza w ilosci 0,05 do 0,54% wagowych oraz w obecnosci tiosiarczanu sodu, siarczanu sodu, rodanku sodu, samych lub w mieszaninie w ilosci 0,07 do 20% wagowych. Jako sól chelatowa zwiazków zelaza stosuje sie sól sodowozelazowa kwasu etylenodwu- aminoczterooctowego.Nowe rozwiazanie przyczynia sie do przyspieszenia reakcji utleniania hydrochinonu, która zwieksza zdolnosc sorpcyjna roztworu w stosunku do jonu siarkowego, a tym samym podwyzsza sprawnosc odsiarczania gazu.Chinon zawarty w alkalicznym roztworze wodnym utlenia wystepujacy w gazie siarkowodór do siarki elementarnej, a nastepnie hydrochinon utlenia sie do chinonu tlenem molekularnym zawartym w powietrzu. Do wodnego alkalicznego roztworu zawierajacego hydrochinon o pH 8,8 dodaje sie jako katalizator sól sodowozelazowa kwasu etylenodwuaminoczterooctowego w ilosci^ 2 143 567 0,3% wagowych. Ponadto do roztworu dodaje sie równiez tiosiarczan sodu i rodanek sodu w ilosci 14% wagowych. W wyniku utleniania hydrochinonu uzyskano stopien odsiarczania gazu wynosza¬ cego 72% przy czasie reakcji 25 minut. .W innym przykladzie wykonania do wodnego alkalicznego roztworu zawierajacego hydro¬ chinon dodaje sie sól sodowozelazowa oraz siarczan sodu lub rodanek sodu.Zastrzezenia patentowe ' 1. Sposób utleniania hydrochinonu w alkalicznych roztworach wodnych podczas odsiarcza¬ nia gazu polegajacy na utlenianiu wystepujacego w gazie siarkowodoru do siarki elementarnej przez chinon znajdujacy .sie w alkalicznym roztworze wodnym i utlenianiu hydrochinonu do chinonu tlenem molekularnym zawartym w powietrzu, znamienny tym, ze proces utleniania hydrochinonu w roztworze o pH 6,5 do 9,0 prowadzi sie w obecnosci katalizatora w postaci soli chelatowych zwiazków zelaza w ilosci 0,05 do 0,54% wagowych oraz w obecnosci tiosiarczanu sodu, siarczanu sodu, rodanku sodu, samych lub w mieszaninie w ilosci 0,07 do 20% wagowych. 2. Sposób wedlug zastrz. 1, znamienny tym, ze jako sól chelatowa zwiazków zelaza stosuje sie sól sodowozelazowa kwasu etylenodwuaminoczterooctowego.Pricowni* PoHgnficzm U? PRL. Ntklid 100 egz.Cen* 220 zl PLThe present invention relates to a method of oxidizing hydroquinone in alkaline aqueous solutions during gas desulfurization. It is used in the desulphurization of coal and coke oven gas. The previously known method of oxidation of hydroquinone in alkaline aqueous solutions during gas desulphurization consists in the fact that the quinone contained in the solution oxidizes the hydrogen sulphide present in the gas to elemental sulfur, and then oxidizes it in its reduced form again to quinone with molecular oxygen in the air. The time needed for the reaction of quinone oxidation is 30 to 60 minutes - Long time of hydroquinone oxidation increases the size of the gas desulphurization system and increases the amount of alkaline circulating solution, and the contact of sulfide ions with oxygen also increases the amount of gaseous effluent. The invention, consisting in the oxidation of hydrogen sulfide present in gas to elemental sulfur by quinone in an alkaline aqueous solution and oxidation of hydroquinone to quinone with molecular oxygen contained in the air, is characterized by the fact that the process of oxidation of hydroquinone in solution with pH 6.5 to 9.0 leads to in the presence of a catalyst in the form of iron chelate salts in an amount of 0.05 to 0.54% by weight and in the presence of sodium thiosulfate, sodium sulfate, sodium hydroxide, alone or in a mixture in an amount of 0.07 to 20% by weight. As a chelate salt of iron compounds, the sodium iron salt of ethylenediaminetetraacetic acid is used. The new solution contributes to the acceleration of the hydroquinone oxidation reaction, which increases the sorption capacity of the solution in relation to the sulfur ion, and thus increases the efficiency of desulfurization of the gas in water. Hydrogen sulfide in the gas to elemental sulfur, and then the hydroquinone is oxidized to quinone with molecular oxygen contained in the air. The sodium iron salt of ethylenediaminetetraacetic acid in an amount of? 2,143,567 0.3% by weight is added as a catalyst to the aqueous alkaline solution containing hydroquinone at pH 8.8. In addition, sodium thiosulfate and sodium thiosulfate are also added to the solution in an amount of 14% by weight. The oxidation of the hydroquinone resulted in a degree of desulfurization of the gas of 72% with a reaction time of 25 minutes. In another embodiment, an aqueous alkaline solution containing hydroquinone is added sodium ferrous salt and sodium sulfate or sodium thiocyanate. Claims 1. A method of oxidizing hydroquinone in alkaline aqueous solutions during gas desulfurization by oxidizing the gas hydrogen sulfide to sulfur. elemental by quinone in an alkaline aqueous solution and oxidation of hydroquinone to quinone with molecular oxygen contained in the air, characterized in that the oxidation of hydroquinone in solution at pH 6.5 to 9.0 is carried out in the presence of a catalyst in the form of chelate salts of iron compounds in an amount of 0.05 to 0.54% by weight and in the presence of sodium thiosulfate, sodium sulfate, sodium hydroxide, alone or in a mixture in an amount of 0.07 to 20% by weight. 2. The method according to claim The method of claim 1, characterized in that the iron sodium iron salt of ethylenediaminetetraacetic acid is used as the chelate salt of iron compounds. Potownia * PoHgnficzm U? PRL. Ntklid 100 copies Price * PLN 220 PL

Claims (2)

Zastrzezenia patentowe 1. ' 1. Sposób utleniania hydrochinonu w alkalicznych roztworach wodnych podczas odsiarcza¬ nia gazu polegajacy na utlenianiu wystepujacego w gazie siarkowodoru do siarki elementarnej przez chinon znajdujacy .sie w alkalicznym roztworze wodnym i utlenianiu hydrochinonu do chinonu tlenem molekularnym zawartym w powietrzu, znamienny tym, ze proces utleniania hydrochinonu w roztworze o pH 6,5 do 9,0 prowadzi sie w obecnosci katalizatora w postaci soli chelatowych zwiazków zelaza w ilosci 0,05 do 0,54% wagowych oraz w obecnosci tiosiarczanu sodu, siarczanu sodu, rodanku sodu, samych lub w mieszaninie w ilosci 0,07 do 20% wagowych.Claims 1. '1. A method of oxidizing hydroquinone in alkaline aqueous solutions during desulfurization of gas, consisting in the oxidation of hydrogen sulphide present in the gas to elemental sulfur by quinone found in an alkaline aqueous solution and oxidation of hydroquinone to quinone with molecular oxygen contained in the air, the fact that the oxidation of hydroquinone in solution with a pH of 6.5 to 9.0 is carried out in the presence of a catalyst in the form of iron chelate salts in the amount of 0.05 to 0.54% by weight and in the presence of sodium thiosulfate, sodium sulfate, sodium hydroxide alone or in admixture at 0.07 to 20% by weight. 2. Sposób wedlug zastrz. 1, znamienny tym, ze jako sól chelatowa zwiazków zelaza stosuje sie sól sodowozelazowa kwasu etylenodwuaminoczterooctowego. Pricowni* PoHgnficzm U? PRL. Ntklid 100 egz. Cen* 220 zl PL2. The method according to claim The method of claim 1, wherein the chelate salt of the iron compounds is the sodium iron salt of ethylenediaminetetraacetic acid. Pricownia * PoHgnficzm U? PRL. Ntklid 100 copies Price * PLN 220 PL
PL25234885A 1985-03-11 1985-03-11 Method of oxidating hydroquinone in alkaline aqueous solutions during desulfurization of gases PL143567B1 (en)

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PL25234885A PL143567B1 (en) 1985-03-11 1985-03-11 Method of oxidating hydroquinone in alkaline aqueous solutions during desulfurization of gases

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PL25234885A PL143567B1 (en) 1985-03-11 1985-03-11 Method of oxidating hydroquinone in alkaline aqueous solutions during desulfurization of gases

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PL143567B1 true PL143567B1 (en) 1988-02-29

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