REMOVING LAUGHING GAS IN MANUFACTURE OF NITRIC ACID Russian patent published in 2004 - IPC

Abstract RU 2237010 C2

FIELD: inorganic chemistry, chemical technology.

SUBSTANCE: invention relates to a device and method for removing N₂O in manufacturing nitric acid. Device is placed behind heat exchanger after combustion of ammonia and before absorption column and comprises a catalyst that includes mainly one or more iron-loaded zeolites. Zeolites as components of a catalyst are taken among the group MFI, BEA, FER, MOR and/or MEL. The iron-loaded zeolite of type ZSM-5 is used as a catalyst mainly. In realization of method the temperature of reaction gas is from 350^oC to 600^oC, the content of NO_x in reaction gas is from 3 to 17 vol.%, the content of steams in reaction gas is from 10 to 20 vol.%. Reaction gas is passed over catalyst at volume rate from 2 000 to 200 000 h^-1. Method provides high degree of N₂O decomposition being in spite the high water content and without loss of activity of the catalyst.

EFFECT: improved method for laughing gas removing.

13 cl, 1 tbl, 2 dwg, 8 ex

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RU 2 237 010 C2

Authors

Shvefer Majnkhard

Maurer Rajner

Turek Tomas

Dates

2004-09-27—Published

2001-01-09—Filed