Wyniki wyszukiwania - Biblioteka Nauki

Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl

Ograniczanie wyników

Znaleziono wyników: 5

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: 2,4-dichlorophenol

Sortuj według:

Ogranicz wyniki do:

Technological aspects of the synthesis of 2,4-dichlorophenol

100%

Białek A. , Moszczyński W.

tom Vol. 11, nr 2

21-30

The main factors influencing the selectivity of chlorophenols synthesis were described. The loss of raw materials and the composition of wastes obtained in a conventional technology of 2,4-D production based on 2,4-dichlorophenol (2,4-DCP) of the 89% purity were presented. The influence of some homogenous catalysts on the selectivity of 2,4-dichlorophenol obtained in phenol and chlorine reaction was examined. Using the combined catalyst enables to chlorinate selectively the monochlorophenols to 2,4-DCP without an undesirable increasing of the 2,6-dichlorophenol and 2,4,6-trichlorophenol contents. The catalyst transformations during the reaction of phenol chlorination were investigated and the method of its elimination after the reaction was elaborated.

Biodostepnosc pozostalosci 2.4-dichlorofenolu zwiazanych w glebie

70%

Lewandowska A.

nr 2

857-860

Rozklad chlorofenoli w srodowisku wodnym

70%

Bogacka T. , Makowski Z. , Ceglarski R.

1996

tom 47

nr 2

181-195

Wyznaczono dynamikę i kinetykę rozkładu chlorofenoli (2,4-DCF; 2, 6-DCF; 2,4,5-TCF; 2,3,6-TCF, 2,4,6-TCF; 2,3,4,6-TeCF i PCF) w warunkach modelowanych, symulujących środowisko wody rzecznej i destylowanej oraz ekosystemu wodnego. Szybkość rozkładu badano w zależności od stężenia początkowego chlorofenoli, temperatury, zdolności adaptacyjnych mikroflory do środowiska tych związków oraz właściwości kumulacyjnych.

The purpose of this study was to establish the distribution of the selected chlorophenols of point (2,4-DCF, 2,6-DCF, 2,4,5-TCF and 2,3,6-TCF) and nonpoint origin (2,4,6-TCF,2,3,4,6-TeCF and PCF) under conditions simulating the environment of river and distilled water and laboratory water ecosystem. The distribution process developed in accordance with the kinetic equation of 1st order, the average degradation half-time at 20°C amounted: model of river - 23, 58,-76, 92 days, and model of distilled water - 36, 53-47, 25 days. The rate degradation in river and distilled water indicates that the river water microoraganisms have no influence on the degradation of determined compounds. When the microflora had been adapted to the presence of chlorophenols the process of degradation was as rule more rapid both investigated temperatures (20°C and 7°C). This process was slowed down by temperature fall to about 7°C. The mixture of chlorophenols at concentration of 10 and 50µg/l when exposed for 20 days to water ecosystem under dynamic conditions, was found to be reduced up 13%. Chlorophenols were not absorbed by Elodea canadensis and Physa fortinalis and weakly by Lebistes reticulatus (cumulation coefficients - 0,42-30,27). In the case residual DCP and TCP -weakly (4,71 -46,23 µg/kg). The investigated concentrations of chlorophenols didn't exert positive effect on the aquatic biocenosis (except Lebistes reticulatus), settled in the ecosystem.

Wplyw stosowania herbicydu 2,4-D na zanikanie 2,4-dichlorofenolu w glebie

70%

Lewandowska A.

2002

tom 42

nr 2

765-768

Degradations of 2,4-dichlorophenol and polychlorinated biphenyls with zero valent iron under subcritical conditions. Importance of subcritical water oxidation

61%

Oh S.-Y. , Yoon M.-K.

Environment Protection Engineering

2015

tom Vol. 41, nr 3

73--86

The abiotic transformations of 2,4-dichlorophenol (DCP) and polychlorinated biphenyls (PCBs) has been examined in the presence and of zero valent iron (Fe(0)) under subcritical conditions. It was found that the degradation of DCP was significantly enhanced, showing complete degradation of DCP in 3 h at 300 °C. Control experiments without Fe(0) indicated that the removal of DCP in the iron–water system was mostly due to subcritical water oxidation and that the enhancement of degradation in the presence of Fe(0) was less significant. Regardless of Fe(0), PCBs were rapidly decomposed, showing 93% destruction in 5 h at 300 °C. Product identification by gas chromatography-mass spectrometry (GC-MS) analysis showed that the reductive transformation of DCP and PCBs w Fe(0) existed under subcritical conditions. Our results suggest that subcritical water degradation may be a possible remediation option to treat DCP and PCBs in water and soil.