SU611879A1 - Method of obtaining ammonium nitrite - Google Patents

Description

This invention relates to the production of ammonium nitrite, concerns the absorption of nigrous gases, and can be used in the production of mineral fertilizers.

A known method for producing solutions.

Ammonium nitrite under atmospheric or elevated pressure, when the process of absorption of nitrous gases is carried out in one absorption column l.

The closest to the proposed method to the technical essence and the achieved result is the method of commissioning ammonium nitrate, which consists in producing ammonium nitrite from nitrous gases by oxidizing them with oxygen-containing gases, followed by absorption with ammonium carbonate solutions at a pressure of 1-7 kg / cm and temperature minus 5 ° С - plus 20 ° С 2.

When ammonium nitrite is produced in a known manner, uneven oxidation of nitrous gases along the absorption height is observed.

In addition, the presence of oxygen in nitrous gases at the stage of obtaining the finished

the product leads to the formation of a byproduct - weak nitric acid and ammonium nitrate - which reduces the productivity of the process as a whole (the degree of processing of nitrogen oxides to form the desired product is 22-30%).

The aim of the invention is to increase the productivity of the process by eliminating the formation of by-products.

The proposed method for producing ammonium nitrite by absorbing nitrous gases with a carbonate-mica solution in the presence of an oxidizing agent under pressure in an absorption column is characterized in that imitated gases are previously removed oxygen, and nitric oxide or oxygen supplied to each is used as an oxidizing agent. Tarolku differentiated by the height of the absorption column. The oxidizer feeds into the column south to the ratio NO: N02 i: l at the end of the absorption process.

Claims (2)

Technologists of the proposed method ssh-; toit, in the following, nitrous gai, pshuchennye v.kontaktnemamaparage, composition, sat.%: N0 - 10.65%, 02.4.05%, N2.67.2, water 18.1 (enter waste heat boiler, from where, at 400 ° C, to the combustion chamber, where natural gas is simultaneously supplied. In the combustion chamber, oxygen is burned out after the ammonia conversion process, resulting in an increase in the temperature of the gas. vol.%: N0 10.3 NT, 65.83, water 21.7, C02 2.05, after the combustion chamber enter the second waste heat boiler, where nitrosis The cooled gases are cooled to 2OO ° C. The gases are then cooled in a high-speed refrigerator to 40 ° C., then in a brine refrigerator to a temperature of 0 ° C. The condensate from nitrous gases is separated in separators and sent to a collection, from where it is pumped to the top of the column .. The nitrous gases of the composition;% by volume: -N013.5, N, 83.8, COj. 2.7, after the separation of water, enter the plate-type absorption column. The ammonium carbonate solution and ammonia water are fed to the top of the column. Oxygen or nitrogen oxide, which is necessary for the oxidative absorption process, is supplied in parallel uniform flows; To each plate, the height of the plate is N0: at the end of the absorption process. The content of nitrogen oxides in gases entering the absorption increases by 30-40%. Claim 1. The method for producing ammonium nitrite by absorbing nitrous gases with a carbonate-ammonia solution in the presence of an oxidizing agent under pressure in an absorption column, is characterized in that and as an oxidizing agent, nitric oxide is used; oxygen supplied to it. each plate is differentiated according to the height of the absorption column, 2. The method according to claim 1,. o tl and h and y and Yc, in that the oxidant feed is carried out to a ratio of NO: NO: 1: 1 to the absorption process. Sources of information taken into consideration during the examination: 1.A. Atroschenko V.I. Kargin S. I, Technologist of nitric acid, M., Himi, 197O. with. 183-184. 2. M. Pozin, E, Technologists and minerals: salts, h. 2. L, Himi, 1970, p. 12O9.