Oy Tampella Ab

Sirpa L Hamala

Timo Kenakkala

Tuomo Ruohola

Pentti Janka

Kari Kokkonen

Jouko Laine

Anna-Kaisa Kontturi

Matti Heikkila

Veli J Sarkkinen

Martti Lehtimaki

Seppo T Koivunen

A process for causing gaseous trace element particles to pass from a flowing hot gas into a fine particulate material by means of water. A mixture of the hot gas and water drops is caused to flow substantially upwards at such a velocity that the water drops remain in the gas flow and for a period long enough for most of the mass of the water drops to evaporate in order to cool the gas and to increase its relative humidity. After the gases have reached their wet temperature, they are brought into a turbulent state in order to cause the dust particles and the water drops which have decreased through evaporation to impinge against each other in order to produce in the aqueous film which covers the dust particles an exothermal ion reaction between the gaseous water-soluble trace element particles and the fine particles. Thereafter, the mixture is caused to flow further in order to evaporate the remaining water by means of the heat of reaction so that a dry end product is obtained.

Process for removing a constituent from a hot gas stream by exothermic

The invention relates to a process and apparatus for causing the sulfur dioxide of flue gases to react to form solid sulfates and sulfites which can be separated from the flue gases. Sulfur dioxide containing flue gases (16) are directed according to the invention into one end of an oblong reaction zone (4), in addition to which pulverous calcium compounds and water are directed separately into the reaction zone at several points, and finally from the opposite end a flue gas suspension is withdrawn and directed to dust separation (5). By feeding the pulverous reagent and the water separately into the reactor 4, the problems involved in the preparing, handling and spraying of an aqueous slurry are avoided, in addition to which the retention time and the reaction conditions can be regulated easily in the oblong reactor 4.

Process for causing the gaseous sulfur compounds of flue gases to react

A process for recovering lignosulfonates from spent sulfite liquor resulting from the cooking of cellulose-containing material comprising extracting the spent liquor with a liquid amine dissolved in a strongly polar ketone, preferably methyl isobutyl ketone, as an organic solvent, which ketone is poorly soluble in water, to form a lignosulfonate-bearing organic phase and an aqueous phase, separating the organic phase from the aqueous phase, recovering the substantially sugar-free lignosulfonates from the organic phase by stripping the organic phase with a base insoluble in the organic phase, regenerating the stripped, lignosulfonate-free organic phase by treating it with an aqueous solution of sodium bisulfite to bring the liquid amine in the phase into bisulfite form and returning the regenerated organic phase for further extraction of spent liquor.

Process for recovering lignosulfonates from spent sulfite liquor

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Tampere, Finland

Sirpa L Hamala