Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 13

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
Content available remote

Oxidation of hexafluoropropylene with molecular oxygen

100%
Meissner E., Wróblewska A.
Polish Journal of Chemical Technology
|
2007
|
vol. 9
|
issue 1
20-22
EN
The results of the oxidation of hexafluoropropylene (HFP) to hexafluoropropylene oxide (HFPO) have been presented. The oxidation was carried out in an autoclave within the range of temperatures of 120 - 170°C and in the presence of an organic solvent (carbon tetrachloride). Molecular oxygen was used here as an oxidizing agent. The influence of: the molar ratio of HFP/O from 13.4 to 4.09:1, the process temperature, the addition of inert gas (nitrogen) from 4 to 18 atm and the periodical dosing of oxygen were investigated. The functions describing the process were: the conversion of HFP and the yield of HFPO in relation to HFP consumed. The presented process is very interesting owing to a wide application of HFPO.
2
Content available remote

Bis(3-methyl-1-propene) ether and 3-(3-methyl-1-propene)-3-methyl-1,2-epoxypropane ether synthesis during the epoxidation of 1-butene-3-ol with hydrogen peroxide over the TS-2 catalyst

100%
Wróblewska A., Wójtowicz G.
Polish Journal of Chemical Technology
|
2010
|
vol. 12
|
issue 3
66-71
EN
The influence of technological parameters on the transformation of 1-butene-3-ol (1B3O) to bis(3-methyl-1-propene) ether (2×1B3O ether) and 3-(3-methyl-1-propene)-3-methyl-1,2-epoxypropane ether (1B3Ox1,2EB3O ether) over the TS-2 catalyst was presented. The reaction was performed in a glass reactor at atmospheric pressure and in methanol medium (protic solvent). The optimum conditions of 2×1B3O ether and 1B3Ox1,2EB3O ether obtaining were established by the mathematical method of experiments design (rotatable-uniform design) and after the analyses of the layer drawings.
3
Content available remote

Epoxidation of 1-buten-3-ol under atmospheric pressure over the Ti-Beta catalyst

100%
Wróblewska A., Wajzberg J.
Polish Journal of Chemical Technology
|
2007
|
vol. 9
|
issue 2
110-113
EN
The results of 1-buten-3-ol (1B3O) epoxidation with 30% hydrogen peroxide over the Ti-Beta catalyst were presented. The studies were performed under the atmospheric pressure and at the presence of methanol as a solvent. There was examined the influence of the following parameters: the temperature (0 - 60°C), the molar ratio of 1B3O/H2O2 (1:1 - 5:1), methanol concentration (5 - 90 wt%), the Ti-Beta catalyst concentration (0.1 - 5.0 wt%) and the reaction time (0.5 - 5.0 h). The optimal parameters were determined by using the following functions: the selectivity of the transformation to 1,2-epoxy-3-butanol (1,2E3B) in relation to 1B3O consumed, the selectivity of the transformation to organic compounds in relation to hydrogen peroxide consumed, the conversions of 1B3O and hydrogen peroxide. The main product of epoxidation was 1,2-epoxy-3-butanol, epoxide having several applications.
4
Content available remote

Studies on the deactivation of Ti-MCM-41 catalyst in the process of allyl alcohol epoxidation

100%
Wróblewska A., Makuch E.
Polish Journal of Chemical Technology
|
2013
|
vol. 15
|
issue 4
111-115
EN
The synthesis of Ti-MCM-41 catalyst was performed. The obtained catalyst was characterized by the following instrumental methods: UV-vis, IR spectroscopy, XRD, and X-ray microanalysis. The activity of the obtained catalyst was tested in the process of allyl alcohol epoxidation with 30 wt.% hydrogen peroxide in methanol as a solvent and under atmospheric pressure. In the next stage, recovery of Ti-MCM-41 catalyst from the post-reaction mixture and its regeneration by washing with appropriate solvents and drying were conducted. In the case of total loss of the activity of the catalyst, calcination of the catalyst was also carried out. The loss of titanium from the structure of Ti-MCM-41 catalyst and a partial collapsing of the structure of this catalyst can be the main reason of the decrease the activity of the catalyst what was manly visible in the decrease of the values of two functions of this process: the allyl alcohol conversion and conversion of hydrogen peroxide to organic compounds.
5
Content available remote

The new method of 1,2-epoxy-3-butanol production over titanium silicalite catalysts

100%
Wajzberg J., Wróblewska A.
Polish Journal of Chemical Technology
|
2007
|
vol. 9
|
issue 2
49-52
EN
The results of 1-butene-3-ol (1B3O) epoxidation over the titanium silicalite catalysts: TS-1, Ti-Beta, Ti-MCM-41 has been presented. The optimal parameters obtained for the individual catalyst were compared. The main functions describing the process were: the selectivity of transformation to 1,2-epoxy-3-butanol (1,2E3B) in relation to 1B3O consumed, the conversions of 1B3O and hydrogen peroxide and the selectivity of the transformation to organic compounds in relation to the H2O2 consumed. The main product of the epoxidation process was 1,2-epoksy-3-butanol, the chemical compounds having a lot of applications.
6
Content available remote

Oligomerization of hexafluoropropylene oxide in the presence of alkali metal halides

100%
Meissner E., Wróblewska A.
Polish Journal of Chemical Technology
|
2007
|
vol. 9
|
issue 3
95-97
EN
Oligomers of hexafluoropropylene oxide are raw materials for the synthesis of compounds having unique properties such as high chemical and thermal resistance. Two basic parameters have influence on the process of hexafluoropropylene oxide oligomerization: the kind of the catalyst and the solvent. The temperature and pressure influence this process to a lesser extent. The influence of halide ions, the solvent and the temperature on the oligomerization of hexafluoropropylene oxide has been studied.
7
Content available remote

Research on the influence of parameters on hexafluoropropylene oxide oligomerization in the presence of complex amines

100%
Meissner E., Wróblewska A.
Polish Journal of Chemical Technology
|
2007
|
vol. 9
|
issue 3
98-100
EN
Oligomers of hexafluoropropylene oxide were tested as potential materials for obtaining vari-ous compounds with unique properties, of which most important are chemical and thermal re-sistance. Two basic parameters influence the oligomerization process of hexafluoropropylene oxide: the type of the catalyst and the type of the solvent. Other parameters such as temperature and pressure have significantly less influence. The influence of tertiary amines as catalyst, the type of the solvent, temperature, pressure and catalyst concentration were tested in the process of hexafluoropropylene oxide oligomerization.
8
Content available remote

Synthesis and characteristics of titanium silicalite TS-1, Ti-Beta and Ti-MWW catalysts

81%
Wróblewska A., Fajdek A., Milchert E.
Polish Journal of Chemical Technology
|
2009
|
vol. 11
|
issue 1
64-71
EN
The synthesis methods of the following titanium-silicalite catalysts: TS-1, Ti-Beta and Ti-MWW were presented. The results of the analyses of the catalysts by XRD, SEM and IR, UV-vis methods were also shown. A brief description of the catalytic performances of these catalysts in the oxidation process of olefins, alkenes, alcohols and aromatic compounds was presented.
9
Content available remote

Epoxidation of 2-buten-1-ol over Ti-MCM-41 and Ti-MCM-48 titanium silicalite catalysts

81%
Wróblewska A., Ławro E., Milchert E.
Polish Journal of Chemical Technology
|
2007
|
vol. 9
|
issue 3
1-4
EN
The results of the epoxidation of 2-buten-1-ol with 30 wt% hydrogen peroxide have been presented. As a solvent methanol was used. The process was carried out over the titanium silicalite catalysts: Ti-MCM-41 and Ti-MCM-48. The influence of temperature (20 - 120°C), the molar ratio of CRA/H2O2 (5:1 - 5:1), methanol concentration (5 - 90 wt%), catalyst concentration (0.1 - 5.0 wt%) and the reaction time (30 - 300 min) was investigated. The obtained results were used for the determination of optimum conditions of running the epoxidation process of 2-buten-1-ol.
10
Content available remote

Isolation of 1,2-epoxybutane-3-ol and 2,3-epoxybutane-1-ol from post-reaction mixtures

81%
Wróblewska A., Wajzberg-Prokowska J., Ławro E., Milchert E.
Polish Journal of Chemical Technology
|
2010
|
vol. 12
|
issue 2
29-32
EN
Attempts were made to isolate 1,2-epoxybutane-3-ol and 2,3-epoxybutane-1-ol from post-reaction mixtures left after the epoxidation of 1-butene-3-ol and 2-butene-1-ol with hydrogen peroxide by thin film distillation. From the raw mixture containing about 8.3 wt% of the epoxide at the first stage the concentration of epoxide is increased to 32 wt%. At the second stage of distillation the epoxide fraction is concentrated to about 76 wt%. After the third stage of thin film distillation the epoxide fraction of 99.6% purity can be obtained. The concentration of this fraction by azeotropic distillation with n-propanol as an azeotropic agent permits obtaining epoxide of 99.6 wt% purity.
11
Content available remote

Epoxidation of crotyl alcohol in the presence of titanium silicalite Ti-MWW catalyst - the new and friendly method of 2,3-epoxybutane-1-ol synthesis

81%
Wróblewska A., Fajdek A., Milchert E.
Polish Journal of Chemical Technology
|
2010
|
vol. 12
|
issue 2
57-61
EN
Epoxidation of crotyl alcohol (CA) with 30 wt% hydrogen peroxide over Ti-MWW catalyst has been studied with methanol as a solvent and at autogenic pressure. The influence of temperature in the range of 20-120°C, the molar ratio of CA/H2O2 1:1-5:1, methanol concentration 5-90 wt%, Ti-MWW catalyst concentration 0.0-5.0 wt% and the reaction time 5-300 min have been studied. The main product of CA epoxidation is 2,3-epoxybutane-1-ol (2,3EB1O), a compound with many applications.
12
Content available remote

The Ti-MWW catalyst - its characteristic and catalytic properties in the epoxidation of allyl alcohol by hydrogen peroxide

81%
Wróblewska A., Fajdek A., Milchert E., Grzmil B.
Polish Journal of Chemical Technology
|
2010
|
vol. 12
|
issue 1
29-34
EN
Ti-MWW, one of the latest titanium-silicalite catalysts, has been prepared by direct hydrothermal synthesis using hexamethyleneimine as a structure-directing agent. The characteristic of the catalyst was performed by means of the following methods: XRD, SEM, IR, UV-vis and X'Ray microanalysis. The catalytic properties of Ti-MWW have been compared with those of the conventional titanium-silicalites TS-1 and TS-2 in the epoxidation of allyl alcohol with hydrogen peroxide. The process has been described by the following main functions: the selectivity of the transformation to glycidol in relation to allyl alcohol consumed, the conversions of the substrates (allyl alcohol and hydrogen peroxide) and the selectivity of the transformation to organic compounds in relation to hydrogen peroxide consumed.
13
Content available remote

The pressure method of 1-butene-3-ol epoxidation over Ti-beta catalyst

71%
Wróblewska A., Wajzberg J., Milchert E., Grzmil B., Ziebro J.
Polish Journal of Chemical Technology
|
2007
|
vol. 9
|
issue 2
53-56
EN
The investigations of 1-buten-3-ol (1B3O) epoxidation by 30% hydrogen peroxide over Ti-Beta catalyst were performed. The experiments were carried out under the autogenic pressure and at the presence of methanol as a solvent. The influence of the following technological parameters on the course of epoxidation: temperature (20 - 120°C), the molar ratio of 1B3O/H2O2 (0.5:1 - 5:1), methanol concentration (5 - 90 wt%.), Ti-Beta concentration (0.1 - 5.0 wt%) and the reaction time (0.5 - 5.0 h) was investigated. The main functions describing the process were: the selectivity of transformation to 1,2-epokxy-3-butanol in relation to 1B3O consumed, conversions of substrates as well as the selectivity of transformation to organic compounds in relation hydrogen peroxide consumed.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.