Aktiebolaget Bofors

John Troeng

Hans Broberg

Lars Douren

For concentration and possible purification of mineral acids, particularly sulphuric acid, a furnace which can be heated is utilized, in which one or several long quartz tubes are placed. The quartz tubes are sealed at the upper and lower parts of the furnace and inside the furnace the quartz tube is heated from the outside with the utilized means. The acid which is to be treated is fed to the respective quartz tube via the upper parts of this, and the purified acid is collected in a vessel located at the lower parts of the quartz tube. Packings of small and/or medium dimensions are arranged in the quartz tubes.

Device for concentration and possible purification of mineral acids,

The present invention provides a unique structure for concentrating mineral acids, and particularly sulphuric acid wherein a plurality of long quartz tubes extend vertically through a furnace and have vertically lower ends in communication with a receiving vessel. The quartz tubes are surrounded by tube units and flow passageways are created on either side of the tube units for directing hot combustion gases along the quartz tubes, providing convective and radiative heat transfer to the tubes as required to heat the acid flowing therethrough. An assembly is positioned for generating turbulance within the gas flow passageway to achieve a vigorous turbulance of the hot combustion gases.

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Lund, Sweden

John Troeng