SU8370A1 - The method of obtaining sulfuric acid - Google Patents

Description

The proposed method for the manufacture of sulfuric acid is intended to simplify and cheapen the previously known devices for the production of the above product, in the form of lead chambers and reaction towers. A distinctive feature of this method is the desire to bring the gas mixture to be oxidized, which contains SOa, into close contact with nitrosic acid and, at the same time, conduct the process in such a way that in all its stages the degree of nitrous acid is kept within certain limits (54 -58 ° Be), while in the previously known methods the concentration of nitrosic acid varied from zero to a certain maximum value.

In FIG. 1 shows in vertical section a diagram of individual rooms for mixing and irrigation chambers, in which the oxidation of sulfurous acid occurs.

. in sulfuric; FIG. 2 - the same scheme in cross section.

The whole process is as follows (Figs. 1 and 2). A mixture of gases containing 502 enters first through pipe a into room L, intended for denitration of marketed sulfuric acid. Then, through the tube d, this mixture goes into the mixing room, in which the nitrosic acid with the help of a rapidly rotating shaft of acid material (the German patents of one of the inventors, Schmiedel, per. 358866 and 359963) is sprayed into the smallest rain coming contact with the gas mixture. Then the latter goes into the e above the compartment, filled with suitable material, irrigating the chamber (in which it goes to meet the inflowing pipes p, l from the tank) k acidic streams. The pipe and gases come in; the next mixing department is an irrigation chamber / a, located above it, where the same processes take place, etc.

The room e with the camera /, e with the camera /, etc., is thus made up of complexes that are units of installation.

These complexes are located in the order of the cascade, causing free acid transfusion from the upstream mixing compartment to the downstream pipes S S S through the funnels L, L L, h. The acid from the first lower mixing compartment is sent to the reservoir tank i, from which, with the aid of the pump /, rises into the tank k. From the tank k through the pipes the type of acid passes, partly into the mixing room and partly into the irrigation chambers.

Product development is carried out in the following order. First of all, it is observed that a continuous stream of nitrosic acid of a certain composition goes along all the complexes.

This is achieved by introducing into the apparatus in appropriate proportions of water and nitric acid in such a way that the concentration of nitrosic acid reaches 56 ° Be. Then, the rollers in mixing rooms, set in motion by a motor, sprayed the nitrosis contained in them into a fine rain, which comes into close contact with the injected gas mixture. An energetic oxidation reaction is occurring. It was learned from practice that in this case about 50% of sulfurous acid, already in the first mixing compartment, is converted into sulfuric acid, and the corresponding amount of lower nitrogen oxides enters the gas mixture. It is possible, in the presence of a relatively concentrated solution of sulfuric acid, the formation of nitrosyl-sulfuric acid and the precipitation of ka. dimensional crystals are prevented by the influx of fresh, normal composition, nitrous acid entering through the reflux chamber. The gas mixture from the first complex is sent to the second and further complexes until the final residue of the sulfur dioxide and nitrogen oxides disappear from the mixture. Since the sulfuric acid formed during the described process is absorbed by nitroso, circulating throughout the apparatus, is not exposed at any stage of the denitration process, the portion of nitrous acid corresponding to the daily production must be removed from circulation and subjected to denitration in a specially adapted apparatus. For the same purpose, a special chamber 6, in which a small amount of nitrosis sulfuric acid containing a small amount of nitrosa, under the pressure of a fresh stream of a newly introduced gas mixture, easily and quickly denitrates, can serve also for the same purpose (Fig. 1). The sulfuric acid freed from nitrosis is transferred from this chamber to a special storage facility.

The subject of the patent.

Claims (5)

1. A method of producing sulfuric acid without using ordinary lead chambers and reaction towers, using mechanical devices for mixing gases containing 502 with nitrous sulfuric acid, characterized in that nitrous sulfuric acid is of a known content in one or more devices for mixing in the smallest crushing, in order to create a large surface of contact between nitrosis and gas, is brought into close contact with a gas containing SO2, in such large quantities that it is in In the nitrate acid, anywhere in the plant remains nitrous and, accordingly, sufficiently reactive. 2. Acceptance of the method according to claim 1, characterized in that the shaft described in the German patents no. 358866; and 359963 is used as a tool for mixing. 3. A method according to claim 1 and 2, characterized in that the mixture of gases after the premise for mixing: the baths pass through: a mixture irrigated with the same nitrous acid as used in the premise for mixing. 4. A method according to Claims 1 to 3, characterized in that the gases containing 50 are first passed into the denitration room, corresponding in their arrangement to the displacement room, where the acid is denitated before the sale; corresponding to the daily production, and then the mine room for irrigation, they are passed into the first room for mixing with the adjacent room for irrigation, after which they are passed alternately through further rooms for mixing and for irrigation, while all these rooms are in reverse ke gases passed odinekovogo acid composition. 5. A method of carrying out the method according to claim 1-4, characterized in that each room for mixing with its associated room for irrigation is fed with acid separately from the others. Type of. „Printed Labor.