CC BY
77
Section 15. Chemistry
11. Jumaeva D. J., Eshmetov I. D., Agzamhodj aev A. A. Process Wastewater Treatment carbon adsorbents//Materials Resp. Scientific conference on technics “The ingredients are from local and recycled materials to produce new composite materials.” Tashkent. 2014. P. 114-115.
12. Jumaeva D. J., Eshmetov I. D., Agzamhodjaev A. A. Wastewater production of carbon adsorbents//Proceedings of IV Republic Scientific Practical Conference “Actual issues of chemistry” Termiz. Part 2: 2014, P. 301-303.
13. Kalendarev I. Y. Influence of physical and chemical properties of coal in the compressibility and conditions for briquettes and molded adsorbents.//Abstract of dissertation work. Candidate of Science. Tashkent., 1984. - 22 p.
14. Voyutsky, S. S. Course of Colloid Chemistry, Graduate School, Moscow, 1964. -356 p.
15. Serpionova E. N. Industrial adsorption of gases and vapors, Moscow: Higher School, 1969, -324 p.
Toghasharov Ahat Salimovich, Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan,
Senior Researcher E-mail: [email protected]. Tukhtaev Saidahral, Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan, head of the laboratory "Defoliations" E-mail: [email protected].
Study of the Solubility of Components in the System Ca(ClO3)2-2NH2C2H4OH-H3 С6 Н507-Н2О
Abstract: The solubility of components in the system Ca(ClO3)2-2NH2C2H4OH-H3C6H5O7-H20 was studied from the complete freezing temperature -43.6°C to 40.0°C. A polythermal solubility diagram was constructed, in which the crystallization fields were determined for ice, Ca(ClO3)2^6H2O, Ca(ClO3)2HH2O, Ca(ClO3)2^2H2O, 2NH2C2H4OH-H3C6H5O7-H20, 2NH2C2H4OThH3C6H5O7, and new compound, (C6H5O7)2Ca3-4H2O, which were identified by chemical and physicochemical analysis methods.
Keywords: solubility, system, the diagramme, concentration, crystallization, temperature, calcium chlorate,
citric acid.
In this report the results of studies of solubility of the water system consisting of calcium chlorate and di-monoetanolamina citrate, which are absent in the literature, but have a certain scientific and practical interest in obtaining polifunktsionalnodeystvuyuschih defoliants.
For research was used calcium chlorate - the active ingredient calcium chlorate-chloride defoliant inorganic origin. However, its effect on plants in excess hectare application rate results in drying of leaves and burns young unopened cotton bolls. Moreover, the drug has no effect polyfunctional. In the synthesis of new effective defoliants is ofconsiderable interest to use monoethanolamine salt of citric acid, a plant growth stimulator. It has biological activity, enhances oxidation-reduction processes, carbohydrate biosynthesis and action enzymatic activity [1,2].
For physico-chemical study of the process of obtaining an effective defoliant based on chlorate calcium and citrate dimonoetanolamina investigated the
solubility of the components in the system Ca(ClO3)2-2H2NC2H4OH-H3C6H5O7-H2O in a wide temperature and concentration range.
Dimonoetanolamin citrate synthesized based on citric acid and monoethanolamine, taken at a molar ratio of 2:1.
Solubility in the system 2H2NC2H4OH-H3C6H5O7-H2O We studied in the temperature range from -23.0 to 70.0 °C. Polytermic solubility diagram is characterized by its branches crystallization ice, 2HNCHOH.HCHO-HO and 2HNCHOH.
224 36572 224
H3C6H5O7, which intersect at two points of double coexistence of two solid phases. The first double point meets co-crystallization of ice and citric acid monohydrate dimonoetanolamina at -23.0 °C and a concentration of 67.0% 2H NC H OH-H C H O and 33.0%
2 2 4 3 6 5 7
H2O. The second double point corresponds to co-crystallization dimonoetanolamina citrate monohydrate and
144
Study of the Solubility of Components in the System Ca (ClO3)2-2NH2C2H4OH-H3 С6 Н507-Н2О
anhydrous at 26.0 °C and the concentration of citrate dimonoetanolamina 77.0% and 23.0% water.
Calcium chlorate dihydrate obtained by reacting stoichiometric mixtures of sodium chlorate and calcium chloride fused mark «h» in an acetone medium, followed by recrystallization from an aqueous solution of a solid material isolated from the acetone extract [3]. The binary system of calcium chlorate-water, part of the system under study has been studied earlier by the authors [4]. Data obtained are in good agreement with the literature.
Polyterm solubility of Ca(ClO3)2-2H2NC2H4OH-H3C6H5O7-H2O studied visual polythermal method [5]. For the identification of the resulting new phase were used chemical and physico-chemical methods of analysis. When quantitative chemical analysis of liquid and solid phases calcium - volume determined by complexometric [6], the content of chlorate ions is the volume perman-ganometric method of [7], the elemental analysis for carbon, nitrogen, hydrogen was carried out according to [8]. Thermal analysis was performed on System derivatograph Paulik-Paulik-Erdei [9] with a rate of10 dg / min at linkage
0.1125g sensitivity galvonometrov T-900, TG-200, the
DTA-1/10, DTG-1/10. Recording was carried out under atmospheric conditions. Holder served as a platinum crucible with a diameter of 10mm without cover. Used as reference Al2O3. Radiographs of the test compounds were recorded on a DRON-2.0 with filtered copper radiation at 40 kV, current strength - 20 mA speed counter
- 2 deg / min [10]. IR absorption spectra of the starting components and the test compounds were recorded on a spectrophotometer Specord IR -75 at frequencies 4000
- 400 cm-1. Samples were prepared by compression with KBr and trituration in vaseline oil [11].
System Ca(ClO3)2-2H2NC2H4OH-H3C6H5O7-
H2O studied using eight internal cuts. I-V of them held by dimonoetanolamina citrate-water to the top of Ca(ClO3)2-2H2O, and VI-VIII of the hand calcium chlorate - water to the pole 2H2NC2H4OH-H3C6H5O7.
Based on the solubility data of binary systems and internal sections built polytermic solubility diagram of calcium chlorate-dimonoetanolamin citric acid-water from -43.6 to 40.0 °C, which demarcated the field of crystallization: ice, six-, four- and dihydrate chlorate calcium, citrate dimonoetanolamina monohydrate, anhydrous and as a new phase (C6H5O7)2Ca3-4H2O (Fig. 2, Table).
Table 1. - Double and triple point of Ca(Cl03)2-2H2NC2H40H-H3C6H507-H20
Composition of liquid phase,% Tcr., °С Solid phase
Ca(ClO3)2 2NH2C2H4OHH3C6HsO7 H2O
1 2 3 4 5
46,1 - 53.9 -40,3 Ice+Ca(ClO3)2-6H2O
44.4 1.8 53.8 -43.6 Ice+Ca(ClO3)2-6H2O+
39.2 2.0 58.8 -42.5 Ice+(C6Hs07)ICa,4H2°
18.6 7.0 74.4 -18.0 То же
13.6 17.2 69.2 -7.0 То же
10.5 35.8 53.7 -8.6 То же
6.9 56.0 37.1 -13.6 То же
5.8 61.8 32.4 -24.2 Ice+<C6HsO7)2CaJ^4H2O+ 2NHIC2H4OH-H,C<iH1O/H2O
- 67.0 33.0 -23.0 Ice+2NH2C2H4OH-H3C6H5O7-H2O
4.9 66.6 28.5 6.5 2NHIC2H4OH-H,C,Hsa-H2O
3.6 74.2 22.2 24.0 (C6H5OACa3-4H2O+ 2NH2C2H4OH^H3C6H5O7^H2O+ 2NH2C2H4OH-H3C6H5O7
- 77.0 23.0 26.0 Ice+2NH,C,H4OH^H_C6H5O7 2 2 4 3 6 5 7
3.1 77.6 19.3 33.8 AHAtA4^
145
Section 15. Chemistry
1 2 3 4 5
55.0 - 45.0 -27.2 Ca(ClO3)2-6H2O+Ca(ClO3)2-4H2O
54.1 1.7 44.2 -28.2 Ca(ClO3)2-6H2O+Ca(ClO3)2-4H2O+ (C6Hs°7)2Ca^4H2°
62.0 - 38.0 -6.8 Ca(ClO3)2-4H2O+Ca(ClO3)2-2H2O
61.2 1.4 37.4 -7.6 Ca(ClO3)2-4H2O+Ca(ClO3)2-2H2O+ (C6HA)2Ca,-4H20
Analysis polythermal chart shows that in the studied concentration and temperature within the system is
isolated in crystalline form and identify chemical and physico-chemical methods of analysis.
Fig. 2. Diagram of the solubility of Ca(ClO3)2-2H2NC2H4OH-H3C6H5O7-H2O
Chemical analysis gave the following results were found,%:
C - 26.9; H - 3.15; CaO - 29.50.
for (CH O ) Ca-4H O calculated masses. %
4 6 5 7 2 3 2
C - 27.0; H - 3.16; CaO - 29.47.
It is poorly soluble in hot water than in cold water, very soluble in ammonia, and organic solvents acetone,
alcohol and benzene insoluble.
X-ray diffraction analysis showed that the composition of the compound (C6H5O7)2Ca3-4H2O is characterized by the eigenvalues of the interplanar distances, that confirms his personality (Fig. 3). X-ray analysis showed formation of a new phase, it does not contain impurities precursors.
Fig. 3. Radiographs 1 - Ca(ClO3)2-2H2O, 2 - Connect (C6H5O7)2Ca3-4H2O
146
Study of the Solubility of Components in the System Ca (ClO3)2-2NH2C2H4OH-H3 С6 Н507-Н2О
Fig. 4. Derivation of the compound (С6H507)2Саз■4H20
On warming curve (C6H5O7)2Ca3-4H2O six endothermic effects observed at 138, 188, 370, 702, 848, 871 and exothermic effects when six 269, 315, 423, 502, 551 and 618 °C. The endothermic effect at a temperature range 138188 °C, accompanied by a weight loss agent 0.2-16.8%, which corresponds to a loss of four water molecules. The total weight loss in the temperature range of 60-900 °C by thermogravimetry curve is 69.78% (Fig. 4).
Fig. 5. The IR spectrum of the compound (C6H507)2Ca3-4H20.
For these compounds the change of the absorption bands in the IR spectrum similar to that observed regularities for the compound (C6H5O7)2Ca3-4H2O. Absorption bands Non in 3434.63 cm-1, which are broadened due to the formation ofhydrogen bonds with water molecules. In metallic karboksilotah COO- observed symmetric stretching vibrations at 1360-1450, and asymmetric stretching vibrations between 1540-1650 cm-1 [12]. In the results
obtained symmetric stretching vibrations of COO- groups 1388-1437 cm-1, and asymmetric stretching vibrations obtained bands 1541-1618 cm-1 (Fig. 5).
Thus, the data on the solubility of the components in the system studied Ca(ClO3)2-
2H NC HOH-H CH O-H O which can serve as a sci-
2 24 36572
entific basis for the production of liquid defoliant based on chlorate and calcium dimonoetanolamina citrate.
147
Section 15. Chemistry
References:
1. Saibova M.T. The use of ethanolamines in agriculture // Uzb. chem. Zh. - 1983. - № 1. - P. 58 - 64.
2. Narhodzhaev A.H., Adilova M.Sh., Isakov D., Tukhtaev S. Scientific bases of synthesis of plant growth stimulators of non-performing primary processing of cotton waste - raw//Proceedings of the International scientific and practical conference on the theme: «Scientific and practical basis for improving soil fertility». - Tashkent, 2007. h. I S. 353-355.
3. Auto. svid. USSR № 143691. A method for producing calcium chloride, chlorate defoliant // M, H, Nabiev, Shammas, Tukhtaev S. et al.//Discoveries, inventions. 1985. № 9. S. 84.
4. Kirgentsev A.N., Trushnikova L.N., Lavrenteva V.G. The solubility of inorganic substances in the water. L.: Chemistry, 1972. 248 p.
5. Trunin A.S., Petrova D.G. Visual polythermal method. Kuibyshev, Kuibyshev Polytechnic Institute. 1977. 94. Dep. VINITI № 584-78.
6. Schwarzenbach G., Flaschka G. Complexometric titration. - M .: Chemistry, 1970. - 360 p.
7. GOST 12257 - 77. Sodium chlorate. Technical conditions. - M .: - in standards, 1987. - 19 p.
8. Klimov VA Basic micromethods analysis of organic compounds. - M.: Chemistry, 1975. - 224 p.
9. Paulik F., Paulik J., Erdey L. Der Derivatograph I. Mitteilun E. in automatisch registrierender Apparat zur gleichzeitiger. Auspuchrund der Differential-ther-mogravimetischen Untersuchungen // Z. Anal.Chem. - 1958. - V. 160. -№ 4. - P. 241.
10. Kovba L.M., Trunov V.K. X-ray analysis. - M .: -, Moscow, 1969. - 160 p.
11. Nakamoto K. IR - and Raman Spectra of Inorganic and Coordination Compounds. - M .: Mir, 1991. - 536 p.
12. Smith A. // Applied IR spectroscopy. Moscow. «Peace», 1982 319 p.
Khaitbaev Alisher Khamidovich, National University of Uzbekistan, Associate Professor the Faculty of Chemistry E-mail: [email protected] Toshov Khamza Sayidmurodovich, National University of Uzbekistan, teaching assistant the Faculty of Chemistry E-mail: [email protected] Yarmatov Sardor Sabirjonovich, National University of Uzbekistan, teaching assistant the Faculty of Chemistry E-mail: ya. [email protected]
Study hydrolysis of the Schiff base of pyridoxal
Abstract: The article presents data on the synthesis ofpyridoxal azomethine derivatives with amino compounds of different nature. Data on the study of the stability of the synthesized compounds on the nature of the solvent and pH. The analysis ofthe relative stability of tautomeric forms ofthe compounds synthesized using quantum chemical calculations.
Keywords: UV and IR spectroscopy, Schiff bases, pyridoxal, tautomeric forms, quantum-chemical calculations.
Хаитбаев Алишер Хамидович, Национальный университет Узбекистана, доцент, химический факультет E-mail: [email protected] Тошов Хамза Сайидмуродович, Национальный университет Узбекистана, ассистент, химический факультет E-mail: [email protected]
148
