TY  - JOUR
AU  - Milosavljević, Milutin M.
AU  - Mijin, Dušan
AU  - Konstantinović, Sandra
AU  - Elezović, Nataša M.
AU  - Takić, Ljiljana
AU  - Dražević, Ljubinka
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2628
AB  - Flotation reagents can be transformed to industrial waste if they are stored for a long period of time. Also, if synthesis or drying process is not performed under defined conditions in industrial plants, which produce flotation reagents, batch of waste may arise and be stored as a waste. The chemical composition of this waste depends on the phase in which it was created, but typically includes: unreacted alkali hydroxide, solvent - alcohol and trithiocarbonate and oxidation product - dixanthogenate. In this paper a new laboratory procedure for the treatment of such wastes is described. the identification and separation of industrial waste components is also included. From the separated dixantogenate and xanthate a laboratory synthesis of thioncarbamates is given. In addition, a semi-industrial treatment of waste xanthate is presented. Synthesis of N-alkyl and N,N-dialkyl-O-isobutylthioncarbamates were obtained from the filtrate obtained in the first step. As a by-product, sodium thioglycolate was produced. This by-product is transformed to a thioglycolic acid by the addition of an acid. Also, the synthesis of thioncarbamates from dixanthogenates, isolated from industrial waste as a cake, is desribed. Described waste treatment is additionally interesting due to the production of sulphur as another by-product. laboratory synthesis gave thioncarbamates in yields from 69.7 to 87.7%, while the semi-industrial process for the selected batches produced thioncarbamates in yields from 74.2 to 80.5%. Taking into account the importance of the synthesized compounds as selective flotation reagents, a new procedure of their synthesis from industrial waste is characterized by good yields and purity of the obtained compounds, the simplicity of process, low environmental impact and short reaction times of synthesis.
AB  - U ovom radu je opisan novi laboratorijski postupak prerade industrijskog otpada na bazi ksantata i dat poluindustrijski postupak prerade sa definisanim tehnološkim parametrima. U prvoj fazi prerade se izdvajaju komponente koje ulaze u sastav otpadnog ksantata. Druga faza prerade predstavlja tretman izdvojenih komponenata u prvoj fazi, pri čemu se izdvojeni ksantati i diksantogenati upotrebljavaju za sintezu alkiltionkarbamata, koji nalaze primenu u flotaciji kao selektivni flotoreagensi. Laboratorijskim postupkom prerade dobijeni su tionkarbamati u prinosu od 69,7-87,7%, dok se poluindustrijskim postupkom, za odabrane šarže odgovarajućeg sastava, tionkarbamati dobijaju u prinosu od 74,2-80,5%.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - A new procedure for the treatment of an industrial waste containing flotation reagents
T1  - Novi postupak prerade industrijskog otpada koji sadrži flotoreagense na bazi ksantata
EP  - 339
IS  - 3
SP  - 331
VL  - 68
DO  - 10.2298/HEMIND130618059M
ER  - 

@article{
author = "Milosavljević, Milutin M. and Mijin, Dušan and Konstantinović, Sandra and Elezović, Nataša M. and Takić, Ljiljana and Dražević, Ljubinka",
year = "2014",
abstract = "Flotation reagents can be transformed to industrial waste if they are stored for a long period of time. Also, if synthesis or drying process is not performed under defined conditions in industrial plants, which produce flotation reagents, batch of waste may arise and be stored as a waste. The chemical composition of this waste depends on the phase in which it was created, but typically includes: unreacted alkali hydroxide, solvent - alcohol and trithiocarbonate and oxidation product - dixanthogenate. In this paper a new laboratory procedure for the treatment of such wastes is described. the identification and separation of industrial waste components is also included. From the separated dixantogenate and xanthate a laboratory synthesis of thioncarbamates is given. In addition, a semi-industrial treatment of waste xanthate is presented. Synthesis of N-alkyl and N,N-dialkyl-O-isobutylthioncarbamates were obtained from the filtrate obtained in the first step. As a by-product, sodium thioglycolate was produced. This by-product is transformed to a thioglycolic acid by the addition of an acid. Also, the synthesis of thioncarbamates from dixanthogenates, isolated from industrial waste as a cake, is desribed. Described waste treatment is additionally interesting due to the production of sulphur as another by-product. laboratory synthesis gave thioncarbamates in yields from 69.7 to 87.7%, while the semi-industrial process for the selected batches produced thioncarbamates in yields from 74.2 to 80.5%. Taking into account the importance of the synthesized compounds as selective flotation reagents, a new procedure of their synthesis from industrial waste is characterized by good yields and purity of the obtained compounds, the simplicity of process, low environmental impact and short reaction times of synthesis., U ovom radu je opisan novi laboratorijski postupak prerade industrijskog otpada na bazi ksantata i dat poluindustrijski postupak prerade sa definisanim tehnološkim parametrima. U prvoj fazi prerade se izdvajaju komponente koje ulaze u sastav otpadnog ksantata. Druga faza prerade predstavlja tretman izdvojenih komponenata u prvoj fazi, pri čemu se izdvojeni ksantati i diksantogenati upotrebljavaju za sintezu alkiltionkarbamata, koji nalaze primenu u flotaciji kao selektivni flotoreagensi. Laboratorijskim postupkom prerade dobijeni su tionkarbamati u prinosu od 69,7-87,7%, dok se poluindustrijskim postupkom, za odabrane šarže odgovarajućeg sastava, tionkarbamati dobijaju u prinosu od 74,2-80,5%.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "A new procedure for the treatment of an industrial waste containing flotation reagents, Novi postupak prerade industrijskog otpada koji sadrži flotoreagense na bazi ksantata",
pages = "339-331",
number = "3",
volume = "68",
doi = "10.2298/HEMIND130618059M"
}

Milosavljević, M. M., Mijin, D., Konstantinović, S., Elezović, N. M., Takić, L.,& Dražević, L.. (2014). A new procedure for the treatment of an industrial waste containing flotation reagents. in Hemijska industrija
Association of Chemical Engineers of Serbia., 68(3), 331-339.
https://doi.org/10.2298/HEMIND130618059M

Milosavljević MM, Mijin D, Konstantinović S, Elezović NM, Takić L, Dražević L. A new procedure for the treatment of an industrial waste containing flotation reagents. in Hemijska industrija. 2014;68(3):331-339.
doi:10.2298/HEMIND130618059M .

Milosavljević, Milutin M., Mijin, Dušan, Konstantinović, Sandra, Elezović, Nataša M., Takić, Ljiljana, Dražević, Ljubinka, "A new procedure for the treatment of an industrial waste containing flotation reagents" in Hemijska industrija, 68, no. 3 (2014):331-339,
https://doi.org/10.2298/HEMIND130618059M . .

TY  - JOUR
AU  - Milosavljević, Milutin M.
AU  - Mijin, Dušan
AU  - Milisavljević, Smiljka S.
AU  - Elezović, Nataša M.
AU  - Milanović, Jelena K.
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2442
AB  - A simple and efficient one-pot synthesis was developed for the preparation of S-alkyl thiolcarbamates from xanthogenate without catalyst using water as a solvent. The water can be recycled after removal of the product. The significant features of this protocol are: operational simplicity, mild reaction conditions, recycling of solvent and high product yields. Starting basic alkyl xanthogenate reacts with alkyl ammonium sulfate (aryl ammonium sulfate) and hydrogen peroxide (molar ratio 1:0.55:1) in water at 40 A degrees C for 1 h, followed by additional heating at 70-110 A degrees C for 1-2.3 h. Good to excellent yields were achieved using ammonium sulfate in 10 % molar excess.
PB  - Springer Wien, Wien
T2  - Monatshefte Fur Chemie
T1  - New facile one-pot synthesis of S-alkyl thiolcarbamates from xanthogenate in water
EP  - 1837
IS  - 12
SP  - 1833
VL  - 144
DO  - 10.1007/s00706-013-1083-7
ER  - 

@article{
author = "Milosavljević, Milutin M. and Mijin, Dušan and Milisavljević, Smiljka S. and Elezović, Nataša M. and Milanović, Jelena K.",
year = "2013",
abstract = "A simple and efficient one-pot synthesis was developed for the preparation of S-alkyl thiolcarbamates from xanthogenate without catalyst using water as a solvent. The water can be recycled after removal of the product. The significant features of this protocol are: operational simplicity, mild reaction conditions, recycling of solvent and high product yields. Starting basic alkyl xanthogenate reacts with alkyl ammonium sulfate (aryl ammonium sulfate) and hydrogen peroxide (molar ratio 1:0.55:1) in water at 40 A degrees C for 1 h, followed by additional heating at 70-110 A degrees C for 1-2.3 h. Good to excellent yields were achieved using ammonium sulfate in 10 % molar excess.",
publisher = "Springer Wien, Wien",
journal = "Monatshefte Fur Chemie",
title = "New facile one-pot synthesis of S-alkyl thiolcarbamates from xanthogenate in water",
pages = "1837-1833",
number = "12",
volume = "144",
doi = "10.1007/s00706-013-1083-7"
}

Milosavljević, M. M., Mijin, D., Milisavljević, S. S., Elezović, N. M.,& Milanović, J. K.. (2013). New facile one-pot synthesis of S-alkyl thiolcarbamates from xanthogenate in water. in Monatshefte Fur Chemie
Springer Wien, Wien., 144(12), 1833-1837.
https://doi.org/10.1007/s00706-013-1083-7

Milosavljević MM, Mijin D, Milisavljević SS, Elezović NM, Milanović JK. New facile one-pot synthesis of S-alkyl thiolcarbamates from xanthogenate in water. in Monatshefte Fur Chemie. 2013;144(12):1833-1837.
doi:10.1007/s00706-013-1083-7 .

Milosavljević, Milutin M., Mijin, Dušan, Milisavljević, Smiljka S., Elezović, Nataša M., Milanović, Jelena K., "New facile one-pot synthesis of S-alkyl thiolcarbamates from xanthogenate in water" in Monatshefte Fur Chemie, 144, no. 12 (2013):1833-1837,
https://doi.org/10.1007/s00706-013-1083-7 . .