DE285976C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

Professor K las ο η -Stockholm has shown that the unpleasant smells of boiled or rotting white cabbage in the production of sodium sulfate pulp are mainly caused _{by organic sulfur compounds, in particular methyl sulfite (CHg) 2 S.} The critical temperatures involved in the recovery of the salts from the waste liquors, the formation of the odorous organic

ίο cause sulfur compounds, experience has shown can not be avoided. But K las ο η has shown that by means of very large Water amounts to the organic sulfur compounds from the exhaust gases of the salt recovery furnaces are washable from. However, this type of elimination has not yet been feasible since the large amount of water used makes the process uneconomical and "only eliminates the problems could be achieved to a limited extent. According to Klason z. B. a factory that only 20 tons of pulp produced daily, with 350,000 cbm of exhaust gases daily from the salt kilns To be expected, for which at least 10,000 cbm of water to wash out the organic Sulfur compounds from the exhaust gases would be needed. This means that 243 cbm of exhaust gases per minute would be produced in this system have to treat with around 71,000 liters of water in order to get rid of the odorous compounds.

All the systems that were previously built for exhaust gas scrubbing are therefore without Success has remained because in practice you only ever need a fraction of the required amount of water could spend and there was a lack of funds, a solution of the organic sulfur compounds bring about in water.

It has now been found that the odorous components of the exhaust gases with low Amount of water can be successfully eliminated if you use these exhaust gases with great energy processed with finely divided water. When this mechanical processing interacts with the condensation of the existing water vapors takes place under separation of sulfur a chemical decomposition of the organic sulfur compounds takes place, whereby is achieved to remove the unpleasant odor from the gases without smelling Preserve wastewater. Larger tests have also confirmed that they are odorless Wastewater can be obtained, which is easily fed even to small rivers can.

To carry out the process, the flue gases from the salt ovens, the stove exhaust gases, the constant gases of the evaporation system and the like. Uncooled or cooled rotating impact devices fed to which water is fed at the same time in countercurrent or cocurrent will.

Suitable devices such as B. pumps, centrifuges, disintegrators, hammer mills and the like, are already known in industries other than pulp manufacture. she but have so far only been used to extract solid substances from gases or contaminated air.

Claims (1)

components such as dust, airborne dust, soot, etc., to be removed. They were also suggested for condensation, absorption or similar interactions, but not yet for the removal of odors from exhaust gases the sulphate pulp production. Was missing for the transfer to this new field of work so far also the theoretical knowledge of the chemical decomposition processes that take place. In special cases it is advisable to add chemicals to the washing water, z. B. acids, acidic salts or alkalis, alkaline compounds and the like however, the use of pure water is usually sufficient. Ρλτεν τ claim: Process for the elimination of odors from the fumes and exhaust gases of the sulphate pulp production by washing the gases with water, characterized in that the exhaust gases are uncooled or cooled with water in rotating impact devices (pumps, centrifuges, disintegrators, Beater mills or the like) are brought together in cocurrent or countercurrent.