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Patrylak, K. I.; Patrylak, Lyubov; Taranookha, O. M.

doi:10.1023/a:1010125827670

Cited by 3 publications

(13 citation statements)

References 7 publications

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“…Conditions of the homogeneous-catalytic transesterification of rapeseed oil were found earlier [18]: temperature 283-323 K, atmospheric pressure, reaction time 15-60 min, catalyst (KOH) content 1.5-2.0 wt %. For sunflower oil they are similar.…”

Section: Methodsmentioning

confidence: 96%

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Comparison of Power-Ecological Characteristics of Diesel Engine Work on Mixed Diesel Fuels on the Basis of Ethyl Esters of Rapeseed and Sunflower Oils

Patrylak¹,

Patrylak²,

Okhrimenko³

et al. 2015

ChChT

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Abstract. Power-ecological characteristics of diesel engine work on ethyl esters of rapeseed and sunflower oils and their blends with mineral diesel have been studied. Acceptable power and high environmental performance of the engine work on the studied fuels have been established. It is shown that fuels on the basis of sunflower oil are slightly inferior to fuel on the basis of rapeseed oil in energy performance but surpasses them in environmental performance.

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Section: Methodsmentioning

confidence: 96%

“…The work being conducted in IBOCP of NAS of Ukraine [18][19][20][21] are aimed at creation of domestic technologies for production of biodiesel fuel on the basis of ethanol and oils of different nature. Sunflower is a traditional oilseed for Ukraine, but recently export of rapeseed has been significantly increases.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Power-Ecological Characteristics of Diesel Engine Work on Mixed Diesel Fuels on the Basis of Ethyl Esters of Rapeseed and Sunflower Oils

Patrylak¹,

Patrylak²,

Okhrimenko³

et al. 2015

ChChT

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“…Under usual conditions of high catalyst loads, coking occurs at a maximum initial rate. The pattern observed is quite different in the case of high (50-100 : 1) catalyst/raw material mass ratios (for example, in micropulse cracking of cumene [4,5]) or for high (500-1000 : 1) isobutane/butene ratios on a catalyst bed [2]. Under the indicated conditions, both the main reactions [2, 4] and coking [5] occur in the oscillatory regime.…”

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confidence: 99%

“…Under the indicated conditions, both the main reactions [2, 4] and coking [5] occur in the oscillatory regime. The oscillation period is counted in hours [2,4], where the oscillations themselves are characterized by irregularity.The oscillatory nature of carbonium ion reactions is connected [4] with competition between the raw material and the coke formed on the surface of the catalyst, and is interpreted [4-6] based on the recently observed phenomenon of oscillatory adsorption [7] of the radical 2,2,6,6-tetramethyl-4-hydroxypiperidine-1-oxyl (4-hydroxy TEMPO) on faujasite type zeolites from hydrocarbon media, also with periods of many hours and irregular oscillations. The authors of [8] saw the characteristics of a bridging mechanism for the adsorption oscillations of 4-hydroxy TEMPO in the spotty adsorption of the latter on active sites of a surface initially coated with a hydrocarbon (component A).…”

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Oscillatory character of deactivation of zeolite catalysts in carbonium ion conversions of hydrocarbons

2005

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We have observed damped oscillations of increasing frequency in alkylation of benzene by 1-decene, which we interpret based on surface competition between the benzene and the coke being formed according to a mechanism of alternating inversions of the adsorption layer. We propose a scheme for the inversions in terms of chemical potentials of the adsorbed components. The change in the character of the oscillations is connected with a qualitative change in the coke over time.Deactivation of acidic zeolites in hydrocarbon conversions as a result of blocking of active sites by coke deposits is the biggest problem for carbonium ion processes, since it makes periodic oxidative regeneration of the catalyst necessary. In this case, the time interval between regenerations may vary from many hundreds of hours in alkylation of benzene by olefins [1] down to a few hours in alkylation of isobutane by butenes [2], and even a few seconds in hydrocarbon cracking [3]. Under usual conditions of high catalyst loads, coking occurs at a maximum initial rate. The pattern observed is quite different in the case of high (50-100 : 1) catalyst/raw material mass ratios (for example, in micropulse cracking of cumene [4,5]) or for high (500-1000 : 1) isobutane/butene ratios on a catalyst bed [2]. Under the indicated conditions, both the main reactions [2, 4] and coking [5] occur in the oscillatory regime. The oscillation period is counted in hours [2,4], where the oscillations themselves are characterized by irregularity.The oscillatory nature of carbonium ion reactions is connected [4] with competition between the raw material and the coke formed on the surface of the catalyst, and is interpreted [4-6] based on the recently observed phenomenon of oscillatory adsorption [7] of the radical 2,2,6,6-tetramethyl-4-hydroxypiperidine-1-oxyl (4-hydroxy TEMPO) on faujasite type zeolites from hydrocarbon media, also with periods of many hours and irregular oscillations. The authors of [8] saw the characteristics of a bridging mechanism for the adsorption oscillations of 4-hydroxy TEMPO in the spotty adsorption of the latter on active sites of a surface initially coated with a hydrocarbon (component A). They hypothesized that as 4-hydroxy TEMPO (component B) is fed in portions into the "zeolite-hydrocarbon" suspension, the adsorption spots under the 4-hydroxy TEMPO increasingly expand, reaching their maximum dimensions at the instant they merge with each other (saturation of the zeolite with 4-hydroxy TEMPO), with inversion of the adsorption layer from the "B in A" state to the "A in B" state. Then the sections of the surface under component A become spotty. The values of the chemical potentials µ A a and µ B a for components A and B in the adsorbed state depend on the configuration of the adsorption layer they form [8]. For the same degree of coverage of the surface, in the case of a layer with a spotty configuration the values of µ A a and µ B a will be less than for the layer with a "holey" 42 0040-5760/05/4101-0042

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Alkylation of isobutane with butenes under microcatalytic conditions in pulse mode

Patrylak¹,

Yakovenko²

2021

Vopr. Khim. Khim. Tekhnol.

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Alkylation of isobutane with butenes is one of few important petrochemical processes that is still implemented using liquid acids. New highly active solid alkylation catalysts are investigated for century. The development of new rapid methods for testing catalysts will contribute to progress in this area. Therefore, the aim of the work was to test the possibility of conducting a bimolecular reaction of alkylation of isobutane with butenes in a microreactor in a pulsed mode of feeding. A zeolite-containing alkylation catalyst was synthesized and characterized by X-ray diffraction analysis, temperature-programmed desorption of ammonia and low-temperature nitrogen adsorption. Catalytic studies were performed in a microreactor built into the gas chromatograph scheme, which provided online analysis of the reaction products. The isobutane /butenes mixture was fed into the helium carrier gas stream via a loop. Testing was performed at 80, 100, 135 and 1850C. It was found that a significant amount of products is not desorbed by the carrier gas and is retained by the catalyst at reaction temperatures, while an increase in desorption temperature to 3800C promotes removing the products from the catalyst surface. The highest yield of products was 27% at 800C. With increasing the reaction temperature, the yield drops to 15%. It was shown that the developed method of testing of alkylation catalysts is promising for further use in the search for efficient solid-phase alkylation catalysts.

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Cited by 3 publications

References 7 publications

Comparison of Power-Ecological Characteristics of Diesel Engine Work on Mixed Diesel Fuels on the Basis of Ethyl Esters of Rapeseed and Sunflower Oils

Comparison of Power-Ecological Characteristics of Diesel Engine Work on Mixed Diesel Fuels on the Basis of Ethyl Esters of Rapeseed and Sunflower Oils

Oscillatory character of deactivation of zeolite catalysts in carbonium ion conversions of hydrocarbons

Alkylation of isobutane with butenes under microcatalytic conditions in pulse mode

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