SU132201A1 - Method for regeneration of sulfuric acid with diluted water and contaminated with organic and mechanical impurities - Google Patents

Description

The proposed method of regeneration of sulfuric acid dispersed in water and contaminated with organic and mechanical impurities is that an aqueous solution of sulfuric acid is heated and evaporated from an apparatus with a circulating cevdone-cooled layer of fine-grained heat-transfer agent, for example, quartz sand heated in a special heater , and the resulting mixture of water vapor and sulfuric acid is rectified in a column combined with an apparatus with a fluidized bed of the coolant.

The method is carried out as follows.

An aqueous solution of sulfuric acid is fed through sprays into the evaporation part of the apparatus, in which a quartz-extractor line (or other acid-resistant material), previously heated to 525 °, is in a fluidized state, which is formed due to the vaporized aqueous solution of sulfuric acid, as well as due to water vapor fed to the lower part of the apparatus for stripping waste sand from sulfuric acid vapors.

In the environment of 1Pseudoion of the layered layer, favorable conditions are created for intensive mixing and contact of the preheatically highly heated sand with an aqueous solution of sulfuric acid, which ensures complete evaporation of the latter.

From the evaporating part, the sand continuously passes into the lower, stripping part of the apparatus, to separate it from the entrained beds of sulfuric acid by blowing it with water vapor (or circulating gas).

The stripped hot sand is poured from the bottom of the apparatus into a gripping device, where it is picked up by a mixture of hot gas (or other fuel) and air and transported them up to the separation equipment No. 132201-2. At the same time, the sand and the required temperature due to the heat of combustion of gas (or other fuel) and combustion smoke gases are heated in the transport line.

In the village of the anionic device, the highly heated sand is separated from dust and smoke, first, then the purge can be further separated from them by a water bunker, which is continuously poured back into the evaporator: a device for evaporating a continuously supplied aqueous solution of sulfuric acid.

The resulting sulfuric acid vapors and water vapor are separated in a settling part (above the all-fluidized bed) of the apparatus from the infatuated ache and then flow into the upper, fractionated part of the apparatus, where they are separated into water vapor leaving the upper part of the apparatus and strong sulfuric acid discharged from the lower plates (domes) of the fractionation part of the apparatus.

Subject invention

The regeneration method is diluted with water and sulfuric acid contaminated with organic and mechanical impurities, characterized in that, to obtain pure sulfuric acid, the sulfuric acid diluted with water and contaminated with organic and mechanical impurities is heated and evaporated in a fine-grain circulating fluidized bed apparatus. a heat carrier, for example, K of the Vartsy sand heated in a special heater, and the resulting mixture of a mixture of water and sulfuric acid is rectified in a column combined with an apparatus evdsozhizhennym layer specific heat-yusitel.