Separation of c8 aromatic isomers by pervaporation through commercial polymer films

McCandless, F. P.; Downs, William B.

doi:10.1016/s0376-7388(00)83345-1

Cited by 43 publications

(16 citation statements)

References 8 publications

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“…[39,40] Due to hydrocarbon separation's large economic impact, polymer membranes have been considered by the petrochemical industry for hydrocarbon separations as early as the 1980s. [41][42][43][44] Nevertheless, few continuous implementation has been made at large scale, arguably due to lack of suitable polymer membrane materials. Following recent advancements in aromatic polyimides and microporous polymers, renewed research interests are seen in both industry and academia for glassy polymer membrane-based hydrocarbon separations.…”

Section: Introductionmentioning

confidence: 99%

Hydrocarbon separations by glassy polymer membranes

Iyer

Liu

Zhang

2020

Journal of Polymer Science

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Polymers are unarguably the most broadly used membrane materials for molecular separations and beyond. Motivated by the commercial success of membrane‐based desalination and permanent gas separations, glassy polymer membranes are increasingly being studied for hydrocarbon separations. They represent a class of challenging yet economically impactful bulk separations extensively practiced in the refining and petrochemical industry. This review discusses recent developments in membrane‐based hydrocarbon separations using glassy polymer membranes relying on the sorption‐diffusion mechanism. Hydrocarbon separations by both diffusion‐selective and sorption‐selective glassy polymer membranes are considered. Opinions on the likelihoods of large‐scale implementation are provided for selected hydrocarbon pairs. Finally, a discussion of the challenges and outlook of glassy polymer membrane‐based hydrocarbon separations is presented.

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Section: Introductionmentioning

confidence: 99%

Hydrocarbon separations by glassy polymer membranes

Iyer

Liu

Zhang

2020

Journal of Polymer Science

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“…However, isomer separation is poorly achieved by the conventional distillation process due to the similar volatility of the mixture pairs 1. Low‐temperature crystallization or adsorption processes are often used in the industry for isomer purification, but these processes are complex, expensive, and energy intensive 2…”

Section: Introductionmentioning

confidence: 99%

“…However, the separation of organic liquid isomers through ordinary polymer membranes by pervaporation is still very challenging because of their similarity in physical and chemical properties. Various polymeric membranes have been studied for pervaporation separation of isomers as shown in Table 1 but all exhibit very low separation performance 1–7. In the solution‐diffusion model, the separation performance of a liquid mixture through a membrane is determined by the solubility and diffusivity of permeants in the membrane.…”

Section: Introductionmentioning

confidence: 99%

Polyamide–imide membranes with surface immobilized cyclodextrin for butanol isomer separation via pervaporation

Wang¹,

Chung²,

Wang³

2011

AIChE Journal

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A novel cyclodextrin (CD) derivative, m-xylenediamine-b-cyclodextrin (m-XDA-b-CD), has been synthesized and used to graft b-CD on membrane surface for the pervaporation separation of butanol isomers. The reaction mechanisms for the m-XDA-b-CD synthesis and the membrane surface grafting are confirmed by FTIR and TGA. The asfabricated novel CD-grafted polyamide-imide (PAI) membranes show homogeneous morphology and significant improved separation performance as compared to the unmodified PAI membranes and PAI/CD mixed matrix membranes made of physical blends. The effects of chemical modification time and dope concentration on the asymmetric membrane have been studied. The optimal separation performance can be found with the CD-grafted PAI membrane cast from a 22 wt % dope concentration, which exhibits a total butanol flux of 15 g/m 2 /h and a separation factor of 2.03. This newly developed membrane with surface-immobilized CD may open new perspective for the development of next-generation high-performance pervaporation membranes for liquid separations.

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“…Separation of xylene isomer mixtures is an important process in the production of pure xylenes because of the wide application of xylenes in chemical industry, e.g., they are used for the production of polyesters, motor fuels, and other chemicals such as terephthalic acid, phthalic anhydride, isophthalic acid etc 1. However, xylenes are always produced as an isomer mixture and conventional separation techniques, such as adsorption process using molecular sieves and low temperature fractional crystallization, are energy intensive due to the similar structures and physical–chemical properties of xylene isomers.…”

Section: Introductionmentioning

confidence: 99%

“…Since early 1980s, a great deal of research has focused on selecting PV membranes in separation of xylene isomers. In general, there are three main types of membranes that have been attempted in separating xylene isomers, i.e., inorganic membranes,3–9 polymer membranes,1, 10–14 and organic–inorganic hybrid membranes 15, 16. Inorganic membranes always have high selectivity, but it is still necessary to reduce the preparation costs and improve permeation rate.…”

Section: Introductionmentioning

confidence: 99%

Divinyl benzene cross‐linked HTPB‐based polyurethaneurea membranes for separation of p‐/o‐xylene mixtures by pervaporation

Zhang

Bai

et al. 2011

J of Applied Polymer Sci

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Cross-linked hydroxy terminated polybutadiene (HTPB)-based polyurethaneurea (PU), HTPB-divinyl benzene (DVB)-PU, was synthesized by a three-step polymerization process. It was first used as membrane material to separate p-/o-xylene mixtures by pervaporation (PV). The effects of the content of cross-linker DVB, feed concentration, and operating temperature on the PV performance of HTPB-DVB-PU membranes were investigated. The membranes demonstrated p-xylene permselectivity as well as high total flux. The introduction of DVB significantly enhanced the temperature resistance ability of the HTPB-DVB-PU membranes. With increasing DVB content, the separation factor increased while the total flux decreased a little. The highest separation factor reaches 2.01 and the total flux is 33 g/m 2 h with feed concentration of 10 wt % p-xylene at 30 C. These PV performances with increasing DVB content were explained in terms of the view point of chemical compositions and physical structures of the HTPB-DVB-PU membranes.

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Separation of c8 aromatic isomers by pervaporation through commercial polymer films

Cited by 43 publications

References 8 publications

Hydrocarbon separations by glassy polymer membranes

Hydrocarbon separations by glassy polymer membranes

Polyamide–imide membranes with surface immobilized cyclodextrin for butanol isomer separation via pervaporation

Divinyl benzene cross‐linked HTPB‐based polyurethaneurea membranes for separation of p‐/o‐xylene mixtures by pervaporation

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