SU1310376A1 - Method for producing liquid nitrogen-phosphorus fertilizers - Google Patents

Abstract

This invention relates to methods for producing liquid nitrogen-phosphate fertilizers by ammonizing extraction phosphoric acid. The invention makes it possible to improve the quality of the fertilizers obtained by reducing the content of water-insoluble compounds while increasing their shelf life. To carry out the proposed method, the extraction phosphoric acid is ammoniated with ammonia gas and the reaction mixture is kept for 1-5 min at 210-240 ° C, after which the resulting melt is dissolved in water at pH 5-7 and temperature 30-80 ° C. the fertilizer is stored without sediment for 6 months. 1 tab. with s (L with O5

Description

. 11310376

ISO. Brent relates to methods for producing mineral fertilizers, in particular liquid nitrogen-phosphorus fertilizers.

PL pr pH pH pr

The aim of the invention is to improve 5 fertilizers containing 24.21%.,

ten

f5

25

improving the quality of the fertilizers obtained by reducing the content of water-insoluble compounds while simultaneously increasing the storage time.

Example 1. In the jet reactor serves 1200 kg / h of phosphoric acid extraction (EPA) concentration of 52.3% and 227 kg / h of gaseous ammonia. The process of interaction between EPA and NH is carried out autothermally and due to the thermal effect of the reaction in the reactor. The temperature develops at 210 ° C, which is 10 ° C higher than the melting point of mono- and diammonium phosphate — the main salt components formed during ammonization. The design of the reactor ensures the salinity of the salt components at this temperature for 5 seconds. The resulting salt melt contains 12% (of the total amount of P205-) ammonium polyphosphate. The melt is dissolved in 1147 kg / h of water in the presence of 26 kg / h of ammonia at pH 6.2 and 50 ° C. 2600 kg / h of clear liquid nitrogen are obtained. -phosphoric fertilizers containing 24.12%., 8.12% N and 0.12% insoluble sediment. The resulting fertilizers are stored without increasing the amount of sediment for 3 months.

. Example 2. In the jet reactor serves 1500 kg / h of EPA concentration of 54.26% and 278 kg / h of gaseous ammonia. The process of interaction between EPA and NHj is carried out autothermally and due to the thermal effect of the reaction in the reactor, the temperature develops at 240 ° C, which exceeds by 40 ° C

thirty

8.06% N, insoluble precipitated K is absent. The resulting fertilizers are stored without sediment for 6 months.

The temperature of ammonization of phosphoric acid does not always exceed the melting point of the resulting salt components. When using phosphoric acid with a concentration of less than 50%, the heat of the ammonization reaction is consumed only for the evaporation of water and the melting point of the salt mass in this case is not reached.

Examples of the implementation of the proposed and known methods are presented in the table.

. The data in the table confirm that the application of the proposed method allows to obtain transparent liquid nitrogen-phosphate fertilizers with improved qualities by reducing the content of water-insoluble impurities while increasing the shelf life without the formation of sludge. In addition, the proposed method allows the use of cheaper and more available evaporated extraction phosphoric 35 acid for the production of fertilizers.

Claims (1)

Invention Formula I The method of producing liquid nitrogen phosphorus fertilizers by ammonizing extraction phosphoric acid with gaseous ammonia and processing the resulting reaction mass, characterized in that melting point of mono and dia 45 to improve the quality of the obtained monium phosphate - the main salt components formed during the ammonization of the acid. Dimensions and design of the reactor provide salt-i exposure fertilizers by reducing the content of water-insoluble compounds while increasing the storage time, the resulting reaction. out of the components at this temperature 50 weight hold within 1-5 min at 210-240 ° C, after which the resulting salt melt is dissolved in , g for 5 s. The resulting salt melt contains 19% (of the total amount of V ammonium polyphosphates. water at pH 5-7 and a temperature of 30-80 C, The melt is dissolved in 1533 kg / h of water in the presence of 49 kg / h of ammonia at pH 6.6 and 45 C. Obtain 3360 kg / h of clear liquid nitrogen-phosphorus fertilizers containing 24.21%., 8.06% N, insoluble precipitated K is absent. The resulting fertilizers are stored without sediment for 6 months. The temperature of ammonization of phosphoric acid does not always exceed the melting point of the resulting salt components. When using phosphoric acid with a concentration of less than 50%, the heat of the ammonization reaction is consumed only for the evaporation of water and the melting point of the salt mass in this case is not reached. Examples of the implementation of the proposed and known methods are presented in the table. . The data in the table confirm that the application of the proposed method allows to obtain transparent liquid nitrogen-phosphate fertilizers with improved qualities by reducing the content of water-insoluble impurities while increasing the shelf life without the formation of sludge. In addition, the proposed method makes it possible to use cheaper and more accessible evaporated phosphoric acid for the production of fertilizers. Invention Formula I A method of producing liquid nitrogen-phosphate fertilizers by ammonizing extraction phosphoric acid with gaseous ammonia and processing the resulting reaction mass, characterized in that fertilizers by reducing the content of water-insoluble compounds while increasing the storage time, the resulting reaction. at 210-240 ° C, after which the resulting salt melt is dissolved in water at pH 5-7 and a temperature of 30-80 C, 56.21 50 40 6.4 8.21 0.08 amorphous precipitate Additional concentration is necessary to obtain the required t °. EPA