DETERMINATION OF THE AREA OF CRYSTALLIZATION OF A NEW DOUBLE COMPOUND IN THE SYSTEM MONOMETHYLOL UREA-MOLYBDENUM PHYTO COMPOUND-WATER

Abstract

The chemical interaction in the three-component water-salt system monomethylolourea-molybdenum-water phytocomposition was studied by visual-polythermal and isothermal methods of physico-chemical analysis. Binary systems were studied by the visual-polythermal method: monomethylolurea (MMM)–water; molybdenum phyto-compound (FSMo)–water, as well as a triple system: MMM–FSMo–water in a wide concentration and temperature range. The binary systems MMM–water and FSMo–water, which are part of the system under study, were studied from the complete freezing of the system (-3.4) to 45.4 ^oC (MMM) and (-1.3) to 43.2 ^oC (FSMo). The triple MMM–FSMo–water system was investigated at temperatures from (-11.0 OC) to 40.0 ^oC, by six internal sections; of these, I-IV were carried out from the MMM–water side to the top of the molybdenum phytocomposition, and V–VI from the FSMo –water side to the top of the MMM. Analysis of the solubility diagram showed that the MMM-FSMo compound is formed in the temperature range (-6.9) to 35.2 ^oC at a content of 3.7-38.3% MMM and 5.1-6.5% FSMo.  By isothermal method at a temperature of 25 °C, it was found that in the concentration range of solutions of 12.2 – 9.8% MMM and 2.8 – 5.4% FSMo, MMM crystallizes in the system, in the concentration range of 5.7 - 2.1% MMM and 12.3 – 15.5% FSMo, FSMo crystallizes, and in the concentration range of 8.2 – 6.4% MMM and 6.2 – 9.3% FSMo the compound MMM•FSMo is released from the solution into the bottom phase.

Thus, by visual-polythermal and isothermal methods of physico-chemical analysis, the region of crystallization of a new double compound – an active substance based on monomethylolourea and a phyto-compound of molybdenum at a molar ratio of 1:1 has been established.