Economical p-Xylene and Ethylbenzene Separated from Mixed Xylene

Seko, Maomi; Miyake, Tetsuya; Inada, Koji

doi:10.1021/i360072a008

Cited by 38 publications

(21 citation statements)

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“…Figure 6 shows the adsorption selectivity of 1,6-and 1,5-DMN respected to 2,6-DMN as a function of the adsorbent acid strength (presented in term of S int ). It was found that there is no correlation between the zeolite acid strength and the adsorption selectivity of the DMNs observed as in the case of xylene isomers adsorption (Seko et al, 1979) even some correlations between the NRVs of DMNs and S int have been revealed. This result suggests that the adsorption of the DMNs would not be governed by only the DMN-cation and acid-base interaction.…”

Section: Effect Of Exchanged Cation Of the Faujasite Zeolitesmentioning

confidence: 90%

Study on the adsorption of 1,5-, 1,6- and 2,6-dimethylnaphthalene on a series of alkaline and alkaline earth ion-exchanged faujasite zeolites

2006

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Adsorption of the equilibrium mixture of 1,5-, 1,6-and 2,6-dimethylnaphthalene (DMN) was investigated on a series of alkaline and alkaline earth ion-exchanged faujasite zeolites using pulse test and breakthrough techniques. It was found that the adsorption of the DMNs would proceed through a complex mechanism governing by at least molecular diffusion, acid-base interaction, preferential interaction with cation and molecular displacement. All ion-exchanged faujasite zeolites only provided rejective systems for 2,6-DMN and some of them were potential adsorbents for the 2,6-DMN purification.

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Section: Effect Of Exchanged Cation Of the Faujasite Zeolitesmentioning

confidence: 90%

Study on the adsorption of 1,5-, 1,6- and 2,6-dimethylnaphthalene on a series of alkaline and alkaline earth ion-exchanged faujasite zeolites

2006

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“…Typical p-xylene recovery per pass is over 95% in these processes, which results in less recycle and smaller isomerization units than in crystallization plants. Studies were also done to purify other xylene isomers, and to separate p-xylene and ethylbenzene simultaneously (30,41,42).…”

Section: Hybrid Processesmentioning

confidence: 99%

Hybrid Simulated Moving Bed Processes for the Purification ofp‐Xylene

Jin¹,

Wankat²

2007

Separation Science and Technology

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A parallel two-zone and four-zone SMB hybrid process was developed for p-xylene purification. By placing a high-productivity parallel two-zone SMB in front of an existing four-zone SMB, feed was enriched in the parallel two-zone SMB before it was fed to the four-zone SMB, which allows a higher feed rate to the four-zone SMB. A general design procedure for hybrid SMB-SMB process was developed. Simulations were done with Aspen Chromatography and Aspen Plus. Overall adsorbent productivity was increased by more than 100%, but with 3-5% lower overall p-xylene recovery. With overall recovery of the hybrid process matching the base case, the feed rate was doubled and the overall adsorbent productivity was 50% higher than the base case. The heat duties of distillation columns per unit product were similar for these hybrid processes compared to the base case. If a two-feed raffinate distillation column was used, the heat duty of distillation columns per unit product in the hybrid process was 2-4% lower than the base case. Both parallel two-zone and four-zone SMBs were also developed for use in a hybrid SMB-crystallization process for p-xylene purification. SMB productivity can be increased from 31% to 75% by adding additional pumps between columns to operate columns at their pressure limits. Although additional pumps are useful for both systems, the productivities of the parallel two-zone SMBs were 9% and 16% higher than the corresponding four-zone SMBs with the same number of recycle pumps. For a four-zone SMB with two columns per zone and eight recycle pumps, a 114% increase of productivity was achieved, which is 22% higher than a parallel two-zone with one column per zone and four recycle pumps.

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“…Thus, the production of highpurity EB and PX is an important issue in chemical engineering; for example, EB with >99.5% purity is required for the dehydrogenation of EB to styrene. [1][2][3] In industry, these feedstock chemicals are produced by the distillation of mixed xylene followed by a further purification of the distilled fractions. However, the effective separation of these individual materials remains a difficult task because the mixed xylene feed contains isomers with the same molecular formula (C 8 H 10 ) and similar physical properties, in particular, vapor pressure and boiling point, as shown in Table 1.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, PX is used for the production of terephthalic acid, used principally as a precursor to poly(ethylene terephthalate) (PET), while EB is one of the main precursors for manufacturing styrene. Thus, the production of high‐purity EB and PX is an important issue in chemical engineering; for example, EB with >99.5% purity is required for the dehydrogenation of EB to styrene . In industry, these feedstock chemicals are produced by the distillation of mixed xylene followed by a further purification of the distilled fractions.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Structure–Relative Volatility Relationship Model for Extractive Distillation of Ethylbenzene/p‐Xylene Mixtures: Application to Binary and Ternary Mixtures as Extractive Agents

Kang¹,

Jeon

Hwang

et al. 2016

Bulletin Korean Chem Soc

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We have previously developed and reported quantitative structure–relative volatility relationship (QSRVR) models for single extractive agents. In this study, we introduce extended QSRVR models for binary and ternary extractive agents. The QSRVR models accurately predict the relative volatilities of binary and ternary extractive agents. The service to predict relative volatility for binary and ternary extractive agents is freely available from the Internet at http://qsrvr.opengsi.org/.

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Economical p-Xylene and Ethylbenzene Separated from Mixed Xylene

Cited by 38 publications

References 0 publications

Study on the adsorption of 1,5-, 1,6- and 2,6-dimethylnaphthalene on a series of alkaline and alkaline earth ion-exchanged faujasite zeolites

Study on the adsorption of 1,5-, 1,6- and 2,6-dimethylnaphthalene on a series of alkaline and alkaline earth ion-exchanged faujasite zeolites

Hybrid Simulated Moving Bed Processes for the Purification ofp‐Xylene

Quantitative Structure–Relative Volatility Relationship Model for Extractive Distillation of Ethylbenzene/p‐Xylene Mixtures: Application to Binary and Ternary Mixtures as Extractive Agents

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