SU1611410A1 - Method of cleaning waste gases from nitrogen oxide - Google Patents

Abstract

The invention relates to waste gas cleaning technology used in the chemical industry and allowing an increase in the degree of gas cleaning with increasing temperature and gas flow velocity. The gas to be purified is treated with ammonia in the presence of a supported metallophthalocyanine catalyst, alumina. Tetra-4-tert-butylphthalocyanine cobalt or dioctadecylsulfamoyl copper phthalocyanine is used as a metallophthalocyanine complex with a content of 1.2–2 wt% in the catalyst. The proposed method allows the process to be carried out to a purity level of 99-100% at high volumetric gas flow rates and temperatures up to 150 ° C, which increases the efficiency of the process. 1 hp ff, 2 tab.

Description

The invention relates to methods for sanitary cleaning of waste gases from nitric oxide} npi NiCHHeMbiM in the chemical industry.

The aim of the invention is to increase the degree of purification of gases.

The process technology consists in mixing the gas to be purified with ammonia at a ratio of molar concentrations of NO and equal to 1. 1, and the subsequent gopuskaii gas mixture through a layer to zt; .L; - congestion. For the preparation of a catalyst containing a cobalt derivative, tetra-4-tert-butylphthalo-ocyacis -; Cobalt CoOu (4-t-Bu) i is dissolved in chloroform. The carrier (granular alumina) is fed by prepared solution of 5 m to SACOpoiTjiH phthalocyanine on the carrier in the amount of 1-2 wt.%.

Then, the resulting catal zltor is dried at 00 ° C to constant mass. The concentration of the catalytically active component, tetra-4-tert-butylphthalocyanine cobalt, is determined by the optical density of the solution. Pretreatment of tetra- -; -tpc t-butyl) phthalocyanine cobalt is carried out according to the procedure proposed for tetra-4-tert-butylphthalocyanine copper; a mixture of carefully ground 0.74 g of 4-tert-butylphthalodinitrile and 0.27 g of tetrahydrate cobalt acetate with a catalytic amount of ammonium molybdate is placed in 40 ml of nitrobenzene and boil for 3 hours. The mixture is then chromatographed on alumina with benzene.

For the preparation of a catalyst containing a copper derivative.

Dnoc 7 adcylsulfamoyl 1 al-ianium 1H between di CIFsZO MNS dN, Y) 2 solution to T in chloroform. The carrier — glilirovanuyu OKi-scb aluminum — is impregnated with the prepared solution until the phthalocyanine is absorbed onto the carrier in a quantity of 1 wt.%. SaTe-vi, the resulting catalyst is dried at 10 ° C to; the remaining mass. The concentration of the catalytically active component; di (zctadecyl-sulfa-ilyl-phthalocyanine copper, determined by the optical density of the solution, a preliminary preparation was obtained (dihydrate cyan-phthalocyanine)

As a sidng, brought by n table.1 data, max: the degree of purification is g and when the content of the metal phthalocyanine complex is equal to 2 m and s%,

As / Ideally i-i3, 1, c: nngh danngh. :; r-for1 i: inoco6 allows achieving a degree of purification: and gas, equal to 99–100% at a temperature of 20–150 Cj at a time, as the degree of gas purification according to the known method: conditions 34-8:)%. In addition, the method allows, under such conditions, to increase the volumetric carbon dioxide volume of the gas stream from 155–10 h to a known method to (2, 6–5 5 2). 1 oh while maintaining high

copper ionization and /, 0 g OA gadets1-and ami-- at 200 mi aceto M boil with stirring for 2A h, maintaining pH 7-8. At the end of the reaction, the acetone is distilled off, the precipitate is recrystallized from benzene.

Example. Testing of the cleaning process is carried out in the temperature range of 50-150 ° C in a glass and flow type eactor with a diameter of 10 mm with a catalyst volume of 1 cm. Gas composition: 51 mixture: i Lesoderzhanie, vol.%: 1 hO, 02-1 0; UN, O, s SC Oj 0.01-5.0; W the rest, Vodiga gas velocity of 4700 7200 h, Analysis of gas on c (1-keeping nitrogen oxides before and after the contact apparatus is carried out according to the known test method.

The results are presented in Tables 1 and 2.

20

F o rm y

and

R e te n 1

five

0

Claims (2)

1, Method OCHIS GKI waste GLOBE ) t of nitric oxide by treating the aMMJi aKOM gas in the Grate of the catalyst and the catalyst, with the same, it is still useful to add the O-complexion of the anionic complex on the cut-off alumina, o tl and h a and with the fact that, with C €; 1 C increase in the degree of -: gas test gases, in 1; as a metallophtalium-imchovo UCHO, eksaPl 1: 1 tetra- -; -ret-butyl-taloplan; 1 cobalt or Dio p; t atsi lp su.pfamoilft j: oin copper ,, 2. The method according to p; 1 ,, tl and h and w and with the fact that kagalizator -ic is used in the content in peg, m;: galTable