SU1244136A1 - Method of producing complex fertilizer - Google Patents

Description

Chloride is related to chemistry and chemical technology of mineral fertilizers, in particular fertilizers derived from acidic processing of phosphates.

The aim of the invention is to reduce the consumption of mineral acid while simultaneously increasing the rate of decomposition of phosphates and increasing the nutritional value of fertilizer.

The essence of the method lies in the fact that amino acids, in particular aminoacetic acid, which simultaneously contain the basic amino and acid carboxyl groups, are almost neutral, in the presence of phosphoric, sulfuric and / or nitric acid, interact with formaldehyde to form methylene: diamino acetic acid.

2NH8.CH2.COOH + CHgO- - Н2, С (НСHHHNOOH) g + M.jO and due to the weakening of the basic properties of the amino group react as strong acids and additionally participate in the decomposition of phosphorus, which leads to an increase in speed. the extent and extent of the decomposition process, as this results in the binding of unreacted ammonium sulfate due to the reversibility of the condensation reaction of ammonium sulfate aldehyde and the prevention of its losses, which occurred when free formalin was present in the solution.

The course of these reactions is confirmed by experiments on the interaction of amino-acetic acid and formalin by neutralizing solutions of the starting components and their mixtures with 0.5N alkaline alkali solution (the results of the experiments are shown in Table 1),

Table 2 gives the rate constants of the process of decomposition of Karate phosphorites with sulfuric acid, depending on the decrease in the consumption of consumed acid from the outside due to the regenerated acid used and the amount of aminoacetic acid introduced at different temperatures.

From tab. 2 that when introducing an amino acid in a molar ratio of 1: 1 to an aldehyde, the constant C1x of the decomposition process of phosphate increases by 2 times compared to decomposition without the addition of amino acids, and at a molar ratio of 2: 1, the rate of decomposition of phosphate is 12441362

This value exceeds the previous values of the process parameters in the decomposition of the total acid consumed without using regenerated HjSO / j.

5 As a vodka in alkali consumption

Neutralization of the acidity of 10 g of glycine in the presence of formalin, taken in a molar ratio of 1: 1, the acidity of the medium increases by more than 10 times. 10 An increase in acidity also occurs in a mixture with phosphoric acid, which can be neutralized upon addition. glycine with formalin in the ratio 2: 1, consumption 0.5 n. NaOH increases

15 (per 21 ml) 40 times. Example. one . a) 100 g of apatite decompose .126.75 g of 60% HNOsH 188.1 g of solution I 250 obtained by displacement

20 66 ,, 1 g of ammonium sulfate and 122 g of 37% - nrgo formaldehyde solution. The removal of nitric acid consumption in this case is 34.5%. Ammonium sulphate and formalin are taken from

25 stoichiometric calculation to reduce the consumption of HNO by 50%. - Incomplete use of ammonium sulfate and formalin occurs due to the reversibility of the reaction of ammonia carbon condensation

30 lei in hexomethylenetetramine and the presence of volatile formalin in the solution. Then, an insoluble residue is separated, the solution is neutralized with 11.8 g of ammonia, dried, and granulated to give 225 g

2 / - fertilizer containing 17.3% P 0., - and 19.3% N with the ratio G 1: 0.9.

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45

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Analogously to Example 1a, apatite was decomposed with a mixture of 91.3 g of 60% HNOa, and 188.1 g of a regenerated solution of sulfuric acid, to which 45 g of aminoacetic acid was added. After separating the insoluble residue, the solution is neutralized with 15 g of ammonia, dried, granulated, and 274 g of beats are obtained, containing 14.5%, 16.2% of N, and amino-acetic acid. A decrease in pa (the HNO J code in this case is 56% of the norm for the complete decomposition of apatite versus 34.5% in decomposition without the use of an amino acid.

Example 2

 a) 100 I of phosphorite containing 25.6% Pr5.05, 41.2% CaO, 1.3% MgO, 55 20.2% insoluble residue, decompose 69.1 g of 98% and 40.9 g . regenerated sulfuric acid solution, obtained by mixing 14.4 g

fertilizer containing 17.3% of P 0., and 19.3% of N with the ratio G 1: 0.9.

Analogously to Example 1a, apatite was decomposed with a mixture of 91.3 g of 60% HNOa, and 188.1 g of a regenerated solution of sulfuric acid, to which 45 g of aminoacetic acid was added. After separating the insoluble residue, the solution is neutralized with 15 g of ammonia, dried, granulated, and 274 g of beats are obtained, containing 14.5%, 16.2% of N, and amino-acetic acid. A decrease in pa (the HNO J code in this case is 56% of the norm for the complete decomposition of apatite versus 34.5% in decomposition without the use of an amino acid.

Example 2

 a) 100 I of phosphorite containing 25.6% Pr5.05, 41.2% CaO, 1.3% MgO, 55 20.2% insoluble residue, decompose 69.1 g of 98% and 40.9 g . regenerated sulfuric acid solution, obtained by mixing 14.4 g

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ammonium sulfate and 26.5 g of a 37% -1% formalin solution. The amount of ammonium sulphate and formalin is taken from the stoichiometric calculation for regeneration and consumption reduction of Hg.80 (by 30%. After separating the insoluble residue, the solution is neutralized with 7.5 g of ka dried and granulated. 58 g of fertilizer containing 43% P20s and N are obtained l iPiOff 1: 1.9 The reduction in sulfuric acid consumption is 23.1%.

b) 100 g of phosphate as in Example 2a are decomposed with a mixture of 63.5 g of 98% H230g and 40.9 g of a regenerated solution of H2, SOj, prepared by mixing 14.4 g of ammonium sulfate and 26.5 and 37% solution formalin to which 6.35 g of aminoacetic acid is added. After separating the insoluble part, the solution is neutralized with 8.0 g of ammonia, dried, granulated, and a fertilizer containing an amino acid other than nitrogen and phosphorus is obtained. At the same time, the decrease in the consumption of Hj, SOz is 36% of the norm for the decomposition of phosphate.

PRI me R 3.

a) 100 g of apatite containing 39.6% PgOu, 51.6% CaO, 2.8% RaQi, 1.54% insoluble residue are decomposed with a mixture of 97.2 g of 70% sulfuric acid and HjSOif, regenerated at 36, 3 g of ammonium sulfate using

69.7 g of 37% formalin. After separating the insoluble precipitate, the solution is neutralized with 11.8 g, dried, granulated, and 108 g of fertilizer is obtained with 35.1% Pr, 05 and 18.5% N with an NcPjOg ratio of 1: 1.9. The amount of ammonium sulfate and formalin is taken stoichiometrically, based on a reduction in the flow rate Hj SOi, an actual reduction in consumption (30.5% in this case).

b) Analogously to the example. To decompose 100 g of apatite, a mixture of 106 g of regenerated sulfuric acid solution obtained from 36.3 g of (NH) S and 69.7 g of 37% CHgO and 84.9 g of 70% sulfuric acid, to which 26.5 g of aspartic acid is added. After separation of the insoluble residue, the solution is neutralized with 16 g of W |, granulated, and 150.5 g are obtained

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15-20 25

thirty

five

. five

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complex nitrogen-phosphorus fertilizer containing methylene diamio-aspartic acid. Reduced consumption i ,. is 36% of the norm on the decomposition of apatite.

Example 4

a) 100 g of phosphate is decomposed with a mixture of 173 g of 60% HNOj and 83 g of a solution of regenerated sulfuric acid from .29 g of ammonium sulfate and 54 g of 37Z-formalin. After separating the insoluble residue, the solution is neutralized with 7.5 g of ammonia, dried, granulated, polished, and 194 g of fertilizer are obtained,

containing 13.1% of 19.4% N at a ratio of N: g- 1: 0.7. The amount of ammonium sulphate and formalin is taken from the stoichiometric calculation of the decomposition of phosphate, in which the reduction of the consumption of sulfuric acid from the outside BELOW IS 30%. However, the actual reduction in acid consumption, set at a minimum fy consumption, providing a 98-99% degree of decomposition, is 24.6%.

b) 100 g of phosphorite is decomposed with a mixture of .155.8 g of 60% HNO, and 83 g of a solution of sulfuric acid obtained from

29 g of ammonium sulphate and 54 g of a 37% formalin solution, to which 20.1 aminopropionic acid is added. Filtration of the pulp solution is neutralized. South ammonia is dried, granulated, and 216 g of fertilizer containing, in addition to nitrogen and phosphorus, amino acids are obtained. Dropping The consumption of HNOj due to the enhancement of the acidic properties of the amino acid is 36% against the normal amount of ammonium sulfate in reducing the consumption of HNOa by 30%.

The proposed method allows to expand the scope of sources of production of complex fertilizers based on acidic methods of processing natural salts. The amino acids used are part of the proteins of plant and animal organisms synthesized in the process of assimilating ammonia, and contribute to providing plants with nitrogen. This increases the use of both ammonium sulphate and formaldehyde, thereby reducing the costs required for the purification of the extraction exhaust gases.

Editor .K. Voloshchuk

Compiled by T, Dok1Sh-1 on

Tehred L.Oleynik Proofreader M. Demchik

Order 3768/25 Circulation 419. Subscription

VNIIPY USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, uLoProektnak, 4

Table 1

table 2

Claims (3)

1. METHOD FOR PRODUCING COMPLEX FERTILIZER by decomposing phosphate raw materials with a mixture of mineral acid with ammonium sulfate and formaldehyde, followed by separation of the insoluble residue and neutralizing the finished product, characterized in that * in order to reduce the consumption of mineral acid while increasing the rate of decomposition of phosphates and increase nutrient fertilizer values, amino acids are added to the mixture. 2. The method of pop. ^ characterized in that the amino acids are introduced in a molar ratio with formaldehyde (2-1): 1. 3. The method according to p. ^ Characterized in that amino acids use aminoacetic, aspartic and aminopropionic acid. g cl