Improvement of the process of improving the quality of urea granules

Authors

  • Ivanna Demchuk Cherkasy State Technological University, 460, Shevchenko str., Cherkasy, Ukraine, 18006 Public Company «AZOT», 72, Heroyiv Kholodnoho Yaru, Cherkasy, Ukraine, 18014, Ukraine https://orcid.org/0000-0002-5619-7733

DOI:

https://doi.org/10.15587/2706-5448.2020.218492

Keywords:

granular urea, modifier additives, anti-caking composite, granule flowability, surface treatment, moisture absorption, static strength.

Abstract

The object of research is the process of improving the quality of urea granules by processing. The subject of research is the physicochemical properties of granular urea after processing with a new composite. Granular urea has a wide range of uses, but during storage and sale it is capable of caking with a significant loss of its flowability, static and dynamic strength of granules. When transporting over long distances, these phenomena cause inconvenience in loading and unloading operations, and also affect the quality of the supplied goods. Therefore, the search for methods to improve its quality is still important. The paper considers the results of theoretical studies of ways to improve the quality of granular urea. As a rule, at most enterprises, an additive is introduced into the urea melt - urea-formaldehyde concentrate, which promotes the formation of isometric forms of urea crystals and reduces the growth rate of faces with the third pinacoid. Due to the toxicity of formaldehyde, the market for such urea is limited. The results are presented for laboratory tests of the processing of urea produced by pouring without a fluidized bed, a new anti-caking composite – a hydrolyzed solution of protein raw materials from the family of fibrillar proteins with a protein raw material concentration of 10 %. The main purpose of the granule processing was to improve the quality of urea through the use of a new composite anti-caking agent, which leads to an increase in the shelf life without changing the physicochemical properties and provides an environmentally friendly condition. As a result of laboratory studies, a decrease in moisture absorption was revealed. It has been established that the proposed anti-caking agent exhibits a hydrophobilization effect. The effectiveness of the conditioning action of the proposed composite has been proven, which consists in achieving fixation of a hydrophobic coating of natural origin on the surface of fertilizer granules and, as a consequence, reducing the percentage of caking of fertilizers. The disadvantages of the developed composite were also established, namely: the fact of a decrease in the static strength of granules after processing was established. Therefore, work on improving the composition of the composite will continue.

Author Biography

Ivanna Demchuk, Cherkasy State Technological University, 460, Shevchenko str., Cherkasy, Ukraine, 18006 Public Company «AZOT», 72, Heroyiv Kholodnoho Yaru, Cherkasy, Ukraine, 18014

PhD, Senior Lecturer

Department of Chemical Technology and Purification

Senior Engineer

References

  1. Civalleri, B., Doll, K., Zicovich-Wilson, C. M. (2007). Ab Initio Investigation of Structure and Cohesive Energy of Crystalline Urea. The Journal of Physical Chemistry B, 111 (1), 26–33. doi: http://doi.org/10.1021/jp065757c
  2. Deng, X., Xu, R., Yang, C., Li, J., Wang, Y., Wu, P. et. al. (2019). Analysis of Wetting Behavior and Solidification Process of Molten Urea on a Superhydrophobic Surface and Its Application in Large Granular Urea Production. ACS Sustainable Chemistry & Engineering, 7 (17), 14906–14914. doi: http://doi.org/10.1021/acssuschemeng.9b03078
  3. Tikhonov, V. A., Kulikov, M. A. (2016). Aanaliz pokazatelei kachestva karbamida, proizvedennogo v letnee i zimnee vremia. Vestnik tekhnologicheskogo universiteta, 19 (21), 66–68.
  4. Serii, P. V. (2012). Fiziko-khimicheskie zakonomernosti protsesa kristalizatsii karbamida iz vodnykh rastvorov. Perm, 20.
  5. Serii, P. V., Boiko, I. S., Ostrovskii, C. B., Lanovetskii, C. B. (2011). Issledovanii skorosti rosta kristalla karbamida. Molodezhnaia nauka v razvitii regionov, 291–295.
  6. Soldatov, A. V. (2000). Razrabotka tekhnologii vysokokachestvennogo granulirovannogo karbamida i karbasulfata ammoniia. Nizhnii Novgorod: Nizhegorodskii gos. tekhn. un-t., 17.
  7. Romanov, N. Iu. (2007). Razrabotka sposobov snizheniia slezhivaemosti granulirovannogo karbamida i obogaschennogo karnallita. Perm: Permskii gos. tekhn. un-t., 20.
  8. Shorin, S. V., Ksandrov, N. V., Pastukhova, G. V., Soldatov, A. V. (2012). Obtaining granulated complex fertilizers on base of carbamide and ammophos in high-speed drum granulator. Izvestiya Vysshikh Uchebnykh Zavedenii. Seriya Khimiya i Khimicheskaya Tekhnologiya, 55 (11), 82–85.
  9. Boomadevi, S., Dhanasekaran, R., Ramasamy, P. (2002). Investigations on Nucleation and Growth Kinetics of Urea Crystals from Methanol. Crystal.Research and Technology, 37 (23), 159–168. doi: http://doi.org/10.1002/1521-4079(200202)37:2/3<159::aid-crat159>3.0.co;2-y
  10. Sergeev, Iu. A., Kuznetsov, N. M., Chirkov, A. V. (2015). Karbamid. Svoistva, proizvodstvo, primenenie. Nizhnii Novgorod: Kvarts, 543.
  11. Kilina, N. A., Demchuk, I. M., Stoliarenko, H. S., Fomina, N. M. (2020). Doslidzhennia protsesu pidvyshchennia yakosti hranulovanoho karbamidu shliakhom poverkhnevoi obrobky. VIII Mizhnarodna konferentsiia studentiv, aspirantiv ta molodykh vchenykh z khimii ta khimichnoi tekhnolohii. Kyiv: KPI im. I. Sikorskoho, 25.

Published

2020-12-30

How to Cite

Demchuk, I. (2020). Improvement of the process of improving the quality of urea granules. Technology Audit and Production Reserves, 6(3(56), 13–16. https://doi.org/10.15587/2706-5448.2020.218492

Issue

Section

Reports on research projects