SU1754186A1 - Method of recovering sulfur dioxide from gases - Google Patents

Abstract

METHOD OF EXTRACTING SULFUR DIOXIDE OF GASES

Description

The invention relates to the technology for the recovery of sulfur dioxide from gas mixtures and can be used for flue gas cleaning processes at CHP plants, pyrolysis plants and solid waste incineration plants, boiler plants.

The purpose of the invention is to increase the yield of sulfur dioxide and reduce moisture content.

PRI me R 1. On analytical demons, 5 g of melamine are weighed and placed in a tube. Through a stationary layer of melamine pass 3 - 3.5 liters of moistened gas mixture with a vapor content of 0.020 kg / m3 mixture with a bulk velocity of 0.066. The initial gas mixture is obtained by passing through the dispenser 1 a volume of sulfur dioxide and 99 volumes of air passed through a bubbler with water and mixed in a gas meter. The concentration of sulfur dioxide at the inlet and outlet is determined by the iodometric method.

A sample of sulfur-saturated melamine in a flask with a vapor tube is placed in a glycerin bath and heated to a temperature of 180-200 ° C

The evolved gas is passed through DrexelSO, 1N iodine solution and collected in an aspirator, then the volume of evolved gas is measured by draining the water from the aspirator and determined by titration with sodium thiosulfate solution by changing the solution concentration. Prior to bubbling, the gases through the iodine solution are passed through a condenser cooled by a mixture of ice and sodium chloride, where the moisture condenses to a dew point of -10 ° C and a condensate forms, in which sulfur dioxide partially dissolves. After the end of the experiment, the volume and mass of the condensate were measured, and the amount of dissolved (loss of sulfur dioxide with condensate Cn) of the sulfur dioxide was determined iodometrically.

Moisture Wr calculated by the formula

Vw

shopping mall 64

kg / ma

ms02 21.9 where tk is the mass of condensate, kg;

msoa mass of sulfur dioxide absorbed by a solution of iodine from the gas to be desorbed, kg;

64 — mass of 1000 moles of sulfur dioxide, kg / mol;

21.9 - the volume of 1000 moles of sulfur dioxide, m / mol.

The yield of sulfur dioxide in the desorbed gas and is calculated by the formula

mn -) - yo,

"(1mso2 + Goal

where Ct is the concentration of sulfur dioxide in the source gas;

YU

WITH

JA

cl

00

Os

C2 is the concentration of sulfur dioxide in the purified gas;

tnn is the mass of sulfur dioxide in the condensate;

msos mass of sulfur dioxide absorbed by a solution of iodine from the gas to be desorbed.

The values of the elapse content of the desorbed sulfur dioxide and its output are presented in the table. Examples 2-7 are analogous to example 1, except for the content of the pair in the source gas mixture, the values of which are presented in the table.

Examples 8-13 are similar to example 1, except for the space velocity skip0

five

Claims (1)

nor gas mixture through melamine. The moisture content of the desorbed sulfur dioxide and its yield are listed in the table. DETAILED DESCRIPTION A method for recovering sulfur dioxide and its gases, including sorption of sulfur dioxide by passing a gas mixture through melamine and its thermal desorption, characterized in that, in order to increase the yield of sulfur dioxide and decrease its humidity, the sorption is carried out in the presence of water vapor in an amount of 0.020- 0.174 kg / m of the gas mixture, and the transmission is carried out with a bulk velocity of 0.033-0.1.  Test case