SU674979A1 - Method of obtaining ammonium phosphates - Google Patents

Description

This invention relates to a process for the production of ammonium phosphates used as concentrated fertilizers. A known method for producing ammonium phosphates is by extracting phosphoric acid with an organic solvent, introduced into a porous carrier, stripped with an aqueous solution of alkalis or salts to obtain a solution of saline, evaporation and crystallization of the product. After stripping, the carrier is treated with an organic solvent in order to prevent its loss and sent meg to the extraction of phosphoric acid. In a porous carrier, soponium styrene is used with 10-30 wt.% Divinylbenzene C. The disadvantage of this method is the need for evaporation and crystallization operations, which requires special equipment and greatly complicates the method. The purpose of the invention is to control the process by eliminating the stages of evaporation and crystallization. This is achieved by the fact that in a known method of producing ammonium phosphates, including extraction of phosphoric acid with an organic solvent introduced into a porous carrier, its reextraction and subsequent isolation of the product, reextraction is carried out with the same organic solvent that is introduced into a porous carrier. Carrying out the stripping process eliminates the steps of solution evaporation and product crystallization, as well as combining the processing operations of a porous carrier to compensate for the loss of organic solvent and reextraction of phosphonic acid from the carrier. Example 1. A solution from acid decomposition of an apatite concentrate containing 28% PjOj is passed through a porous styrene copolymer with 10% divinylbenzene containing 51% by weight of tributyl phosphate (TBP). The phosphoric acid saturation of the porous carrier is 70.4 g / l HjPO ,,, Then, pure TBP is passed through a porous carrier with a porous carrier with a volume rate of 0.5 v / v. Output organic solution contains 86.4 g / l,. The degree of regeneration of phosphoric acid from the porous carrier is 99.7%.

The commercial organic solution oo, is worked up with a solution of diammonium phosphate, containing 364 g / l (NH) ijHPOi, and pH 8.1, at room temperature and the ratio of the phases EO: V 2,8: 1. Solid monoammonium phosphate obtained, so-called JaidaY 60.5 wt.% PgO, 12.0 wt.% NJ, 0.2 wt.% SOg, 0.05 wt.% Fe and 0.08 wt.% F

The degree of Stripping of phosphoric acid is 100%. As a result, regenerative TBP is obtained, which is reversible in regeneration npcuecce. The TBP content in the foam carrier is 51%.

Example 2. A solution of phosphorite razloseny containing Roo in g / l. 174.5, SOj - 113.3, Fe - 50.9, At 20, §; F - 15.0, is passed through a porous styrene copolymer with 1% divinylbeneld, coke {: molded 49.5 wt.% TBP and diisoamoctofineoxide (FOR) in the bulk ratio TBP: FOR-2: 1. The concentration of phosphate acids in the polymer is 3.8% g / l, Reg & not carried out with a mixture of AND F + FOR (in bbc, with a ratio of 2: 1 correspondingly). & | 1вЬ | Ш1Ой С1 {anthropogenic plant contains 21.6 g / l NdROts, the degree of regeneration with fophoric acid is 99%.

The output organic solution is processed by the WtMTdlpoM daamms "iphosphate (1} at: Bbj1" the ratio of the phases of V ": HC - 6.2: 1. The degree of reextraction is 100%. This is obtained (jMecb organic solvents (TB 1- FORS), which does not contain phosphoric acid, which is recycled during the regeneration process, and solid 5 monoammonium phosphate, containing 60.0 wt.% 12.0 wt.% N .; 0.6 wt.% S0, r 0.1 wt.% Fe and 0.09 wt.% F.

The content of the solvent mixture in the porous nasiggate is 49.5%.

Formula of invention

The method of producing ammonium phosphates, which includes extraction of phosphoric acid with an organic solvent, introduced into a porous carrier, its reextraction and subsequent extraction of the product, oh h and y and i. so that, in order to make the method more flexible by eliminating the evaporation and crystallization with tadium, the extraction will be supplied with the same organic solvent that is introduced into the porous support;

Sources of information taken into account when exlinter

1. Application 2423448 / 23-26, dated 11.26.76, according to which the decision to issue an author's certificate was made.