SU1643063A1 - Method of cleaning gases of nitrogen oxides - Google Patents

Method of cleaning gases of nitrogen oxides Download PDF

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Publication number
SU1643063A1
SU1643063A1 SU884616845A SU4616845A SU1643063A1 SU 1643063 A1 SU1643063 A1 SU 1643063A1 SU 884616845 A SU884616845 A SU 884616845A SU 4616845 A SU4616845 A SU 4616845A SU 1643063 A1 SU1643063 A1 SU 1643063A1
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SU
USSR - Soviet Union
Prior art keywords
purification
nox
gases
nitrogen oxides
solution
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Application number
SU884616845A
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Russian (ru)
Inventor
Галина Владимировна Грекова
Александр Васильевич Величко
Владимир Леонидович Ивасенко
Original Assignee
Томский политехнический институт им.С.М.Кирова
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Priority to SU884616845A priority Critical patent/SU1643063A1/en
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Publication of SU1643063A1 publication Critical patent/SU1643063A1/en

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Abstract

Изобретение относитс  к технологии очистки газов от NOX селективным каталитическим восстановлением до азота в водных растворах, примен емой в химических производствах и позвол ющей повысить степень очистки и предотвратить накопление в водном растворе продуктов реакции. Газы, содержащие примеси NOX, обрабатывают водным раствором восстановител  - мочевины при мольном соотношении NH2 : СО : NOx, равном 12 1. Раствор содержит катализатор - тетрасульфофталоцианин Си, NI или Со с концентрацией 1 г/л. Температура раствора 30-60°. Степень очистки газов от NOX составл ет 99,0-99,8%. 1 з. п. ф-лы, 1 табл.The invention relates to the technology of purification of gases from NOX by selective catalytic reduction to nitrogen in aqueous solutions, used in chemical production and allowing an increase in the degree of purification and prevent the accumulation of reaction products in an aqueous solution. Gases containing NOX impurities are treated with an aqueous solution of a reducing agent - urea at a molar ratio of NH2: CO: NOx equal to 12 1. The solution contains a catalyst - tetrasulfophthalocyanine Cu, NI or Co with a concentration of 1 g / l. The temperature of the solution is 30-60 °. The degree of purification of gases from NOX is 99.0-99.8%. 1 h. the item f., 1 tab.

Description

Изобретение относитс  к области очистки газов от оксидов путем их селективного каталитического восстановлени  до азота и может быть использовано дл  обезвреживани  отход щих газов химических производств.The invention relates to the field of purification of gases from oxides by their selective catalytic reduction to nitrogen and can be used to deactivate the exhaust gases of chemical plants.

Цель изобретени  - повышение степени очистки и предотвращение накоплени  в водном растворе продуктов реакции.The purpose of the invention is to increase the degree of purification and prevent the accumulation of reaction products in an aqueous solution.

П р и м е р 1. Процесс провод т в проточном реакторе диаметром 10 мм с высотой насадки 150 мм. Объемный расход газов 25 л/ч. Температура процесса 20-60°С. Оксиды азота подаютс  снизу реактора на слой насадки, орошаемой водным раствором , имеющим состав: мочевина 10 мае. %, тетрасульфофталоцианин кобальта с концентрацией 1 г/л, при соотношении NOx: мочевина - 1:12. После очистки концентраци  окислов азота составл ет 0,002 - 0,056 об. %. Степень очистки 98,8% - 99,8%.EXAMPLE 1. The process is carried out in a flow reactor with a diameter of 10 mm and a nozzle height of 150 mm. Gas flow rate 25 l / h. Process temperature 20-60 ° C. Nitrogen oxides are fed from the bottom of the reactor to a layer of a nozzle irrigated with an aqueous solution having the composition: urea 10 May. %, tetrasulfophthalocyanine cobalt with a concentration of 1 g / l, with a ratio of NOx: urea - 1:12. After purification, the concentration of nitrogen oxides is 0.002 - 0.056% by volume. % The degree of purification is 98.8% - 99.8%.

Результаты остальных экспериментов приведены в таблице.The results of the remaining experiments are shown in the table.

Как видно из таблицы, наилучшие результаты получаютс  при температуре 50Ј/С, концентрации катализатора - тетрасуль- фофталоцианина Со, Си или N11,0 г/л, соотношении оксиды азота: мочевина равном 1 : 12.As can be seen from the table, the best results are obtained at a temperature of 50Ј / C, the concentration of the catalyst is tetrasulfophthalocyanine Co, Cu or N11.0 g / l, the ratio of nitrogen oxides: urea is 1: 12.

Как следует из таблицы, предлагаемый способ позвол ет повысить степень очистки от NOx до 99,0 - 99,8% против 96% в известном способе. В водном растворе после его использовани  не накапливаютс  продукты реакции, так как восстановление NOx мочевиной приводит к образованию лишь N2. С02 и НаО.As follows from the table, the proposed method allows to increase the degree of purification from NOx to 99.0 - 99.8% versus 96% in the known method. After using the aqueous solution, the reaction products do not accumulate, since the reduction of NOx by urea leads to the formation of only N2. C02 and NAO.

Claims (2)

1. Способ очистки газов от оксидов азота обработкой водным раствором восстановител  в присутствии катализатора - тетрасульфофталоцианина переходного металла четвертого периода Периодической системы элементов, отличающийс 1. The method of purification of gases from nitrogen oxides by treatment with an aqueous solution of a reducing agent in the presence of a fourth-period tetrasulfophthalocyanine transition metal catalyst, differing соwith сwith OsOs 4 004 00 оabout OsOs соwith тем, что, с целью повышени  Степени очистки и предотвращени  накоплени  в водном растворе продуктов реакции, в качестве восстановител  используют мочевину и процесс ведут при температуре раствора 30-60°С.By the fact that, in order to increase the degree of purification and prevent accumulation of reaction products in an aqueous solution, urea is used as a reducing agent and the process is carried out at a solution temperature of 30-60 ° C. 2. Способ по п. 1,отличающийс  тем, что в качестве катализатора используют тетрасульфофталоцианин меди, никел  или кобальта при концентрации его в растворе 1 г/л при мол рном соотношении мочевины и оксидов азота, равном 12:1,2. A method according to claim 1, characterized in that copper, nickel or cobalt tetrasulfophthalocyanine is used as a catalyst at a concentration of 1 g / l in the solution with a molar ratio of urea and nitrogen oxides of 12: 1,
SU884616845A 1988-12-07 1988-12-07 Method of cleaning gases of nitrogen oxides SU1643063A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4308542A1 (en) * 1993-03-17 1994-09-22 Man Nutzfahrzeuge Ag Method and device for the selective catalytic reduction of NO¶x¶ in oxygen-containing gases

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Выложенна за вка JP № 58-128125. кл. В 01 D 53/34, 1983. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4308542A1 (en) * 1993-03-17 1994-09-22 Man Nutzfahrzeuge Ag Method and device for the selective catalytic reduction of NO¶x¶ in oxygen-containing gases

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