APPLICATION OF ELECTRODIALYSIS FOR PRODUCTION OF MAGNESIUM HYDROXIDE FROM SEA WATER

, , , ,
 70-83 p.
Magnesium hydroxide is an important component of many technological processes, it has found wide application in food, polymer, light industry, while synthetic magnesium hydroxide has a number of advantages over natural, namely, it has a higher decomposition onset temperature, there are no unwanted impurities in the structure product, it has a higher degree of whiteness, as well as the ability to change the specific surface area (activity) and dispersion of particles during synthesis during synthesis. The way of obtaining magnesium hydroxide by membrane methods can be called the most modern and modernized today, membrane technology is attractive for developers and investors: the processes of separation of liquid media proceed at temperatures close to the ambient tem-perature, their flow is controlled and predictable. At the same time, with regard to the production of electrolytes in modern chemical technology, electromembrane processes, in particular, electrodialysis, are widely used. It is pro-posed to use sea water as a raw material - a natural resource with a changing chemical and bacteriological com-position depending on the depth of sampling, temperature, and natural conditions. The technological scheme of production is represented by the main stage (two-stage fractional precipitation in a batch apparatus with a stirrer) and auxiliary equipment (ultrafiltration unit, bipolar electrodialysis unit, reverse osmosis unit, etc.); developed to separate magnesium hydroxide from seawater while simultaneously solving the problem of the implementation of intermediate products, which ensures care for the environment. The developed production of chemical reagents, in particular, magnesium hydroxide, implements the processes of fractional precipitation and electrodialysis. The re-sults of calculating the economic efficiency of the method indicate the quick payback of the project, the low cost of a kilogram of the target product.
Keywords:
magnesium hydroxide, seawater, fractional precipitation, electrolyte, electrodialysis, membrane methods
Titov A.A.
D.I. Mendeleev Russian University of Chemistry and Technology
Bykov V.I.
Postgraduate, D.I. Mendeleev Russian University of Chemistry and Technology
Ilyina S.I.
Candidate of Engineering Sciences (Ph.D.), Associate Professor, Mendeleev University of Chemical Technology of Russia
Ravichev L.V.
Doctor of Engineering Sciences (Advanced Doctor), Professor, D.I. Mendeleev Russian University of Chemistry and Technology
Loginov V.Ya.
Candidate of Engineering Sciences (Ph.D.), Associate Professor, D.I. Mendeleev Russian University of Chemistry and Technology
1. Ahmetov T.G., Busygin V.M., Gajsin L.G., Ahmetova R.T. Himicheskaya tekhnologiya neorganicheskih veshchestv. SPb.: Lan', 2019. 452 s.
2. Technical Grade Magnesium Hydroxide IP BP USP for Laboratory. Mindiamart. ULR: https://www.indiamart.com/proddetail/magnesium-hydroxide-ip-bp-usp-16445613197.html (data obrashcheniya: 28.09.2021)
3. Gidroksid magniya Chem.ru. ULR: https://chem.ru/gidroksid-magnija.html (data obrashcheniya: 28.09.2021)
4. Patent WO-9212097-A1. Magnesium hydroxide having stacked layer, crystalline structure and process therefor.
5. Il'ina S.I. Elektromembrannye processy. M.: RHTU im. D.I. Mendeleeva, 2013. 57 s.
6. Nesterov Yu.V. Ionity i ionnyj obmen. Sorbcionnaya tekhnologiya pri dobyche urana i drugih metallov metodom podzemnogo vyshchelachivaniya. M.: OAO «Vneshtorgizdat», 2007. 17 s.
7. Hvang S.-T. Membrannye processy razdeleniya. M: Himiya, 1981. 464 s.
8. D'yakov B.S. Krupnomasshtabnye kolebaniya v sisteme okean-atmosfera i perspektiva sverhdol-gosrochnogo prognoza temperatury vody Yaponskogo morya. Izvestiya TINRO. 2019. 20 s.
9. Svitcov A.A. Osnovy proektirovaniya proizvodstv, ispol'zuyushchih membrannoe razdelenie: ucheb. posobie. M.: RHTU im. Mendeleeva, 2013. 219 s.
10. Rabinovich V.A., Havin Z.Ya. Kratkij himicheskij spravochnik. 2-e izd., pererab. i dop. M.: Himiya, 1991. 114 s.
11. Demirci S., Öztürk B., Yildirim S., Bakal F., Erol, M., Sancakoğlu O., Yiğit R., Çelık E., Batar T. Syn-thesis and comparison of the photocatalytic activities of flame spray pyrolysis and sol-gel derived magnesi-um ox-ide nano-scale particles. Materials Science in Semiconductor Processing. 2015. № 34. P. 154 – 161.
12. Mirzaei H., Davoodnia A. Microwave Assisted Sol-Gel Synthesis of MgO Nanoparticles and Their Cata-lytic Activity in the Synthesis of Hantzsch 1,4-Dihydropyridines. Chinese Journal of Catalysis. 2012. № 33. P. 1502 – 1507.
13. Molea A., Popescu V., Rowson N.A., Dinescu A. Influence of pH on the formulation of TiO2 nano-crystalline powders with high photocatalytic activity. Powder Technology. 2014. № 253. P. 22 – 28.
14. Magnesium hydroxide having stacked layer, crystalline structure and process therefor: pat. WO-9212097-A1.
15. Sposob polucheniya mikro- i/ili nanometricheskogo gidroksida magniya: pat. RU 2 422 364 C2 Ros. Fed-eraciya: MPK 2009129999/05.
16. Bajmuhambetova M.G., Ryzhak Yu.F. Obshchaya himicheskaya tekhnologiya: met. ukazaniya i kontrol'nye zadaniya dlya studentov zaochnoj formy obucheniya. Pavlodar, PGU im. S. Torajgyrova, 2007. 36 s.