SU1357056A1 - Method of cleaning a gas from sulphuric anhydride - Google Patents

Abstract

This invention relates to a method for cleaning exhaust gases from sulfur-containing toxic ingredients and ;, can be used in a process for cleaning exhaust gases. In order to carry out the method of purifying gas from sulfurous anhydride, it is reduced by carbon monoxide to elemental sulfur in two layers of an oxide catalyst using an iron-chromium catalyst in the first downstream gas at elevated temperature. In order to reduce catalyst consumption and reduce the selectivity of the process for sulfur, the catalyst layer is placed with a gap equal to 2-10 volumes of the first layer, with a volume ratio of layers equal to 1: 2 along the gas flow, and the process is carried out at volume velocities of gas in the first and second layers x, equal to 72-90 and 36-45 thousand-hour, respectively. In this case, the process is carried out at 440-470 0, and an iron-chromium oxide catalyst is used in the second layer. Selectivity up to 97.6%. 2 hp f-ly, 1 tab. C ® SL SAE SL O SL A O)

Description

one

 The invention relates to a method for purifying exhaust gases from sulfur-containing toxic ingredients and can be used in the process of purifying exhaust gases from an admixture of sulfur dioxide by reducing carbon dioxide anhydride.

The purpose of the invention. - reducing catalyst consumption and increasing the selectivity of the process of sulfur.

Example. At the first stage of the reactor load 0.5 cm of catalyst with an average grain diameter of 1.5 mm, and at the second stage - 1 cm of contact of the same fraction. The free volume between the steps; 5 cm, the ratio of the volumes of contact of the first and second stages is 1: 2, the total volumetric gas flow rate is 27,000 hours. At the reaction temperature and W 2.4, the degree of conversion of sulfur dioxide is 96.8%, the selectivity for sulfur is 97.3%

Indicators of catalytic activity with a two-layer catalyst loading (W 2.3 + 0, 1;, 5) are given in the table, where V and Vj are the relative volumes of catalyst on 1 and II layers; Vg is the volume of free space between the layers, relative .; W is the total volumetric gas flow rate (thous;; W is the volumetric velocity on the first layer (thousand h) ;, W is the volumetric velocity on the second

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13570562

layer (thousand); ofco degree of use of carbon monoxide (%);

So,

- degree of conversion of dioxide -

five

ry (%); Z gj - sulfur selectivity (%); t is the temperature (C). about

Claims (3)

1. A method for purifying gas from sulfur dioxide by reducing it with carbon monoxide to elemental sulfur in two layers of an oxide catalyst using an iron-chromium catalyst at elevated temperature in the first gas course, which also differs in reducing the consumption of catalyst increase the selectivity of the process for sulfur, the catalyst layers are arranged with a gap equal to 2-10 volumes of the first layer, with a volume ratio of layers equal to .1: 2 along the gas flow, and the process of winding 5 arcs at volumetric gas velocities in ohm and second layers equal to 72 - 90 thousand and 36-45 thousand soot- shetstvenno... 2. Method POP.1, different - 0 u and with the fact that the process is conducted at 440-470 ° C .. 3. Method according to Claims 1 and 2, of which is a cup, which is based on the fact that in the second layer an oxide iron-chromium catalyst is used. 0