Development of gas‐phase SMB technology for light olefin/paraffin separations

Martins, Vanessa Duarte; Ribeiro, Ana M.; Santos, João C.; Loureiro, José M.; Gleichmann, Kristin; Ferreira, Alexandre F. P.; Rodrigues, Alı́rio E.

doi:10.1002/aic.15238

Cited by 36 publications

(43 citation statements)

References 37 publications

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“…The challenge in this separation with the ZIF‐8 is the desorbent choice and also the optimal operating conditions. Propane has been the selected desorbent on the previous works performed to separate the C 2 mixtures by SMB . While the propane on the binderless 13X zeolite exhibited the behavior of an ideal desorbent, that is, with an intermediate adsorption capacity when compared to the components to be separated, in the case of Cu‐BTC the propane has a higher adsorption capacity when compared to ethane and ethylene, becoming a strong desorbent .…”

Section: Resultsmentioning

confidence: 99%

“…Propane has been the selected desorbent on the previous works performed to separate the C 2 mixtures by SMB . While the propane on the binderless 13X zeolite exhibited the behavior of an ideal desorbent, that is, with an intermediate adsorption capacity when compared to the components to be separated, in the case of Cu‐BTC the propane has a higher adsorption capacity when compared to ethane and ethylene, becoming a strong desorbent . From the adsorption equilibrium isotherms in the ZIF‐8 (Figure ) and mass transport characterization (Figures S11 and S12), one can anticipate that to use propane as desorbent can be problematic, and for that reason the carbon dioxide was proposed as an alternative.…”

Section: Resultsmentioning

confidence: 99%

“…Run 1 and 2 were experimentally performed in the bench scale SMB unit with eight columns. This apparatus is described in the literature, however, to allow a quicker understanding of the work that has been developed, a short description of this apparatus will be provided.…”

Section: Methodsmentioning

confidence: 99%

“…As natural abundance of olefins is low, 97% of ethylene is produced by thermal steam cracking of hydrocarbons (ex: ethane and naphtha) that are primarily originated from fossil resources . Conventionally, the cracked product mixture containing target olefins, unreacted paraffins and undesirable by‐products is submitted to successive distillation steps to remove lighter (H 2 , CH 4 ) and heavier components (C 3 +) and finally separate the ethane/ethylene fractions with different olefin proportions, that can range from 50 to 80% . Required purity of ethylene must be higher than 99.9% for the polymerization processes in later stages involving highly selective but impurity sensitive catalyst.…”

Section: Introductionmentioning

confidence: 99%

“…Large pore surface area and high adsorption affinity guaranty adsorption driven densification of gases at ambient temperature and moderate pressure. Pressure swing adsorption and simulated moving bed (SMB) arose as potential adsorptive processes for the target separation of ethylene/ethane mixtures. For an adsorptive process to be commercially applicable, continuous operation is necessary, but the characteristics of the adsorbent, such as selectivity, cost, and regeneration method (pressure swing, the temperature swing, purge gas stripping, or displacement desorption) must be also evaluated.…”

Section: Introductionmentioning

confidence: 99%

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High purity ethane/ethylene separation by gas phase simulated moving bed using ZIF‐8 adsorbent

et al. 2019

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Growing population and demand for plastics and synthetic fluids in climate friendly environment sets the unprecedented industrial challenge to increase production of clean chemical precursors (e.g., ethylene) with reduced energy consumption and CO 2 foot print. The production of polymer-grade ethylene (>99.9%) from steam cracked gas or oil relies on a cascade of energy intensive distillations of gases. Therefore, in this work two simulated moving bed (SMB) cycles were employed to separate mixtures containing of about 40% of ethane and 60% of ethylene on zeolitic imidazole framework-8 granulates. The separation cycles were performed with two desorbents with different relative adsorption strength. In the experiment, with carbon dioxide as desorbent, ethylene was obtained with 99.6% purity and 94.2% recovery, while in the experiment using propane as desorbent only 77.1% of ethylene is recovered with a purity of 82.7%. Indeed, it can be concluded that when CO 2 is used as desorbent, the obtained productivity is higher. The mathematical SMB model and regions of separation were determined for each desorbent based on experimental data. K E Y W O R D Sadsorption, ethane, ethylene, gas phase SMB, ZIF-8

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High purity ethane/ethylene separation by gas phase simulated moving bed using ZIF‐8 adsorbent

et al. 2019

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Construction of Fluorinated Propane‐Trap in Metal–Organic Frameworks for Record Polymer‐Grade Propylene Production under High Humidity Conditions

Wang

et al. 2023

Advanced Materials

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Propane/propene (C3H8/C3H6) separation is essential in the petrochemical industry but challenging because of their similar physical and chemical properties. Adsorptive separation with C3H8‐selective porous materials can energy‐efficiently produce high‐purity C3H6, which is highly promising for replacing conventional cryogenic distillation but suffers from unsatisfactory performance. Herein, through the precise incorporation of fluorinated functional groups into the confined pore space, a new fluorinated metal–organic framework (FDMOF‐2) featuring the unique and strong C3H8‐trap is successfully constructed. FDMOF‐2 exhibits an unprecedented C3H8 capture capacity of 140 cm3 cm−3 and excellent C3H8/C3H6 (1:1, v/v) selectivity up to 2.18 (298 K and 1 bar), thus setting new benchmarks for all reported porous materials. Single‐crystal X‐ray diffraction studies reveal that the tailored pore confinement in FDMOF‐2 provides stronger and multiple attractive interactions with C3H8, enabling excellent binding affinities. Breakthrough experiments demonstrate that C3H8 can be directly extracted from various C3H8/C3H6 mixtures with FDMOF‐2, affording an outstanding C3H6 production (501 mmol L−1) with over 99.99% purity. Benefiting from the robust framework and hydrophobic ligands, the separation performance of FDMOF‐2 can be well maintained even under 70% relative humidity conditions.

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Design and optimization of JO‐IEX process for highly efficient quaternary separation of 5′‐ribonucleotides

et al. 2022

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The developed JO‐IEX technology was applied to continuously separate four 5′‐ribonucleotides here. The unit contained seven columns with three separation steps, among which three columns were for the quaternary separation and the others for regeneration of resins. The operating conditions, that is, the critical flow rates in three separation steps were preliminarily designed according to the equilibrium theory and optimized by a three‐dimensional theoretical separation region approach. The feasibility of the JO‐IEX process and the separation performances were validated by four runs using the actual 5′‐ribonucleotides' enzymatic hydrolysate as feed solutions. The purities and yields of 5′‐ribonucleotides could reach above 97%. The productivity was enhanced to be 0.91 g/(kg h), and the desorbent consumption was reduced to be 1.01 L/g, compared to those of 0.70 g/(kg h) and 1.75 L/g in the fixed‐bed process. The technology proposed could be a potential technique in the continuous multicomponent ion‐exchange separation process.

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Development of gas‐phase SMB technology for light olefin/paraffin separations

Cited by 36 publications

References 37 publications

High purity ethane/ethylene separation by gas phase simulated moving bed using ZIF‐8 adsorbent

High purity ethane/ethylene separation by gas phase simulated moving bed using ZIF‐8 adsorbent

Construction of Fluorinated Propane‐Trap in Metal–Organic Frameworks for Record Polymer‐Grade Propylene Production under High Humidity Conditions

Design and optimization of JO‐IEX process for highly efficient quaternary separation of 5′‐ribonucleotides

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