SU20646A1 - Sulfuric acid concentration method - Google Patents

Description

The present invention relates to methods for the concentration of sulfuric acid with heated gases in apparatus such as Kessler or Guyr.

In the proposed method, in order to concentrate the new quantities of sulfuric acid and eliminate the loss of sulfur oxides during continuous circulation of employees to heat the gases, the gases coming from the column with sulfuric and sulfuric anhydrides are first sent to the superheater to heat up to 9C-1200, after which again injected into the device for concentration.

The method described in the attached schematic drawing is that the chamber or tower sulfuric acid comes from the pressure tank and flows by gravity into the drying tower with an acid-resistant packing, where it drains the gases going from bottom to top. The acid flowing from this tower b passes the heat exchanger c and then through the heat exchanger r to the saturator d, from where it goes in a concentrated form (vitriol oil) with a temperature of 250-280 ° to the refrigerator e and finally to the collection of the finished product. Distillation products, i.e. water vapor and gases

(sulfuric and sulfurous anhydrides), which are formed mainly in the saturator g, go through the heat exchanger g to the heat exchanger in, where they heat the sulfuric acid flowing from above. After giving away most of their heat to sulfuric acid, these gases and vapors are sent to a coke condensation box, where they are subjected to final cooling and condensed into weak sulfuric acid, which, in the form of distillate, is transferred back to the chamber or tower system. The non-condensed i in the condensation tank, in the form of fuma, is pushed by the fan through the drying tower b, where the irrigating tower sulfuric acid removes them from the water vapor. The sulfuric and sulfurous anhydrides, dried in this way, are subsequently heated to 900-1200 ° in an electric superheater or a superheater such as a Siemens regenerator, and with such a high temperature they re-enter the saturator, from which they again enter the same circular cycle, as described above.

The above method of concentrating sulfuric acid in a closed loop and.

in particular, the author believes that passing into the drying tower of b gases that did not have time to diminish themselves has the advantage over other existing methods that gases 50z and S02, having reached some constant concentration in their circulation and falling into a saturator, by virtue of the law of porous pressure prevent the decomposition of NgZO, and due to the absence of NgO vapors in superheated gases, which are dried beforehand in a drying tower, on the basis of the same law, water is strongly evaporated in the saturation and thereby promotes and accelerates the overall This process of concentration.

Subject Patent a.

The KOMSLER or GY 4Y ra apparatus, characterized by v & w., That the waste gases from the column containing sulfur and sulphide & gy anhydrides are first sent to the heater to heat up to 9 ° C - 1200 °, after which they are reintroduced into the concentrator jigger, with the aim of concentrating new quantities of sulfuric acid and eliminating sulfur dioxide oxides during the continuous circulation of gases, which serve for heating.