Influence of alkylaromatic hydrocarbons on the efficiency of linear alkylbenzene sulfonic acid synthesis

Иванчина, Э. Д.; Ivashkina, Elena; Dolganova, Irena; Frantsina, E. V.; Dolganov, Igor

doi:10.1016/j.cej.2017.06.032

Cited by 19 publications

(5 citation statements)

References 38 publications

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“…One reason for this might be the incomplete conversion of linear olefins. Another possible reason is that the alkylation feedstock had a small amount of diolefins impurities, the benzene reacted with a small amount of the diolefins impurities in the alkylation feedstock to produce phenyl olefins, and its further reaction was inhibited. This resulted in the olefin conversions that were calculated by the determination of the bromine index were less than 100 %.…”

Section: Resultsmentioning

confidence: 99%

Environmentally benign catalytic synthesis and hydro‐refining of linear alkylbenzenes

et al. 2019

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The synthesis technology of linear alkylbenzenes (LABs) was studied through the preparation of an Al-SBA-15 catalyst, the optimization of alkylation conditions, and the regeneration of deactivated catalyst. The hydro-refining over the Pd/Al 2 O 3 catalyst was carried out to remove unsaturated hydrocarbon impurities from the LAB. The results of the alkylation reactions over the Al-SBA-15 catalyst in a liquid fixed bed reactor showed that the olefin conversion remained above 98 % for time on stream of 3000 h, and the LAB selectivity was above 93 % under the following conditions: temperature of 260°C; pressure of 5.0 MPa; weight hourly space velocity (WHSV) of 1.0 h −1 ; and the molar ratio of benzene to olefin of 25:1. Through the burning coke regeneration, the catalytic performance of the deactivated alkylation catalyst was satisfactorily restored. The quality of the LAB synthesized through alkylation and hydro-refining was better than that of the industrial LAB produced using the hydrofluoric acid catalytic process.

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Section: Resultsmentioning

confidence: 99%

Environmentally benign catalytic synthesis and hydro‐refining of linear alkylbenzenes

et al. 2019

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“…Models of benzene alkylation with ethylene [31,32] and benzene alkylation with higher alkenes [33,34] have been developed. These models consider the processes of instability and catalyst deactivation by heavy aromatic compounds.…”

Section: Introductionmentioning

confidence: 99%

Nonsteady-state mathematical modelling of H₂SO₄-catalysed alkylation of isobutane with alkenes

Ivashkina

Иванчина

Dolganov

et al. 2021

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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H2SO4-catalysed isobutane alkylation with alkenes is an important industrial process used to obtain high-octane alkylate. In this process, the concentration of H2SO4 is one of the main parameters. For alkylation, sulphuric acid containing 88%–98% monohydrate is typically used. However, only a H2SO4 concentration of 95%–96% enables alkylate with the maximum octane number to be obtained. Changes in H2SO4 concentration due to decontamination are the main cause of process variations. Therefore, it is necessary to maintain the reactor acid concentration at a constant level by regulating the supply of fresh catalyst and pumping out any spent acid. The main reasons for the decrease in the H2SO4 concentration are accumulation of high-molecular organic compounds and dilution by water. One way to improve and predict unsteady alkylation processes is to develop a mathematical model that considers catalyst deactivation. In the present work, the formation reactions of undesired substances were used in the description of the alkylation process, indicating the sensitivity of the prediction to H2SO4 activity variations. This was used for calculation the optimal technological modes ensuring the maximum selectivity and stability of the chemical–technological system under varying hydrocarbon feedstock compositions.

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“…Previously, we studied the feasibility of reconstruction of mixing devices with the aim to intensify the mixing of reactants during the AlCl 3 alkylation, without modeling of the actual alkylation process. Now we focus on improving the performance of the alkylation reactor developing a model that takes into account the catalyst deactivation, as discussed in refs − .…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modeling of Liquid-Phase Alkylation of Benzene with Ethylene Considering the Process Unsteadiness

Ivashkina

Khlebnikova

Dolganova

et al. 2020

Ind. Eng. Chem. Res.

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Ethylbenzene is a key intermediate in the manufacture of styrene that is an important industrial monomer. Ethylbenzene is produced by benzene alkylation using either gas-phase or liquid-phase methods. The liquid-phase alkylation that uses liquid acidic catalysts needs to be improved. We develop a mathematical model for the liquid-phase benzene alkylation. The reaction scheme, designed with a due analysis of desired and side reactions, and with the analysis of the formation of deactivating agents, reflects, in particular, the influence of the concentration of heavy hydrocarbons on the catalyst activity. The account of the catalyst deactivation by heavy alkylaromatics allows predictions of the temporal changes in the outputs of the alkylation process. In particular, the decrease of the ethylbenzene concentration by 2−3 wt % and increase of the polyalkylate outlet concentration by 1.5−2 wt % are the results of the catalyst deactivation. These effects, however, can be compensated by 1.3-time increase of polyalkylate supply and by the temperature increase up to 398 K. The calculations also show that it is possible to decrease the supply of fresh catalyst from 0.498 to 0.472 t/hour without loss in the yield of ethylbenzene.

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Influence of alkylaromatic hydrocarbons on the efficiency of linear alkylbenzene sulfonic acid synthesis

Cited by 19 publications

References 38 publications

Environmentally benign catalytic synthesis and hydro‐refining of linear alkylbenzenes

Environmentally benign catalytic synthesis and hydro‐refining of linear alkylbenzenes

Nonsteady-state mathematical modelling of H₂SO₄-catalysed alkylation of isobutane with alkenes

Mathematical Modeling of Liquid-Phase Alkylation of Benzene with Ethylene Considering the Process Unsteadiness

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Influence of alkylaromatic hydrocarbons on the efficiency of linear alkylbenzene sulfonic acid synthesis

Cited by 19 publications

References 38 publications

Environmentally benign catalytic synthesis and hydro‐refining of linear alkylbenzenes

Environmentally benign catalytic synthesis and hydro‐refining of linear alkylbenzenes

Nonsteady-state mathematical modelling of H2SO4-catalysed alkylation of isobutane with alkenes

Mathematical Modeling of Liquid-Phase Alkylation of Benzene with Ethylene Considering the Process Unsteadiness

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Nonsteady-state mathematical modelling of H₂SO₄-catalysed alkylation of isobutane with alkenes