Iodine With Hydrocarbons I. Dehydrogenation

Raley, John H.; Mullineaux, Richard D.; Bittner, Clarence W.

doi:10.1021/ja00903a027

Cited by 37 publications

(22 citation statements)

References 7 publications

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“…Another possible way for the ⋅CH(CH 3 ) 2 radical to evolve into C 3 H 6 is by reacting ⋅CH(CH 3 ) 2 radical with ⋅Br and ⋅I radicals, as shown in Reactions (16) and (17) 10b. 14 These two aspects, the trapping of ⋅CH(CH 3 ) 2 radical by I 2 and IBr to form 2‐C 3 H 7 I [Reactions (12) and (15)] and the dehydrogenation of ⋅CH(CH 3 ) 2 radical by ⋅I radical to form C 3 H 6 [Reaction (17)], both contribute to the acceleration of C 3 H 6 formation with the addition of I 2 ,…”

Section: Resultsmentioning

confidence: 99%

Interplay Between Bromine and Iodine in Oxidative Dehydrogenation

2013

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Oxidative dehydrogenation is a promising way to produce olefins, diolefins and aromatics. However, the product yield is limited by the consecutive oxidation of the product to oxygenated products. The highest yield reported for propane oxidative dehydrogenation is only about 30%. Alternatively, halogens can be used as oxidants in oxidative dehydrogenations. Although the iodine process is highly selective, it requires very high reaction temperatures (~ 900 K) to give a good yield of "C3H6+C3H7I", and iodine is too expensive for industrial deployment. Bromine is a more reactive oxidant, however, less selective towards C3H6 and C3H7Br. We show here that using bromine/iodine mixtures with low iodine content (no greater than 20%) results in up to 80% of "C3H6+C3H7X" single-pass yield at moderate reaction temperatures (< 800 K). The results are promising for developing a low temperature on-purpose propylene technology. Furthermore, the underlying chemistry might be extended to the synthesis of many other commercially desirable unsaturated hydrocarbons.

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Section: Resultsmentioning

confidence: 99%

Interplay Between Bromine and Iodine in Oxidative Dehydrogenation

2013

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“…While no previous work has studied the reaction of propane, I2 and O2 in the gas, there is quite a bit of information about various parts of the reaction network to allow us to propose a plausible reaction mechanism. It is generally accepted [30][31][32][33][34] that the reactions of halogens with H2 or alkanes are chain reactions. When iodine is used, the chain initiation is the dissociation of I2,…”

Section: 1mentioning

confidence: 99%

Halogen-Mediated Oxidative Dehydrogenation of Propane Using Iodine or Molten Lithium Iodide

et al. 2016

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We studied propylene production by the reaction of propane with oxygen in the presence of gaseous I2 which works as a gas-phase catalyst. I2 is either introduced as a gas in the mixture of propane and oxygen, or it is produced when propane and oxygen come in contact with molten LiI or a mixture of molten LiI and LiOH. The single-pass propylene yields obtained in both types of experiments are ~64%, at 500 °C and propane partial pressure of 0.1 atm. The main role of I2 is to initiate chain reactions that lead to the formation of a propyl iodide intermediate that decomposes to form propylene. Another important intermediate is HI, which reacts very rapidly with oxygen to regenerate I2 and prevent oxygen from attacking the hydrocarbons.

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“…Elemental iodine ( I 2 ) is an important chemical in industrial processes. Iodine is used in dehydrogenation reactions where hydrocarbons are converted to less saturated hydrocarbons as for example from alkanes to alkenes . After the dehydrogenation, the hydrogen iodide (HI) formed is converted to I 2 at high temperature, of which the gas stream is passed through an adsorbent and I 2 is recovered for further reuse .…”

Section: Introductionmentioning

confidence: 99%

Porous Metal–Organic Framework@Polymer Beads for Iodine Capture and Recovery Using a Gas‐Sparged Column

Valizadeh

Nguyen

Smit

et al. 2018

Adv Funct Materials

138

102

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Iodine (I 2 ) capture and recovery is an important process in many industrial practices. Conventional materials for I 2 capture include Ag 0 -based aerogels and zeolites and C-based aerogels and powders, which suffer from expensive and/or inefficient recovery. Recently, metal-organic frameworks (MOFs) have shown potential as good adsorbents for I 2 capture with high capacity, fast uptake, and good recyclability. The powder form of MOFs, however, often makes them impractical in large-scale applications. Herein, a versatile method based on the phase inversion technique is presented to fabricate millimetersized spherical MOF@polymer composite beads, and the use of these beads for I 2 capture and recovery is demonstrated. Besides preserving the crystallinity and pore accessibility of the embedded MOFs in the polymeric matrix, the beads exhibit higher capacity and faster uptake rate for I 2 in both vapor and liquid phases compared to the bulk MOF powder. In order to showcase the applicability of these beads, a gas-sparged column is used as a proof-ofconcept device that can efficiently capture and recover more than 99% of I 2 from the feeding solution. The beads can be recycled and reused multiple times, which in combination with their easy handling and storage highlights their superiority compared to MOF powders in adsorption applications.

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Iodine With Hydrocarbons I. Dehydrogenation

Cited by 37 publications

References 7 publications

Interplay Between Bromine and Iodine in Oxidative Dehydrogenation

Interplay Between Bromine and Iodine in Oxidative Dehydrogenation

Halogen-Mediated Oxidative Dehydrogenation of Propane Using Iodine or Molten Lithium Iodide

Porous Metal–Organic Framework@Polymer Beads for Iodine Capture and Recovery Using a Gas‐Sparged Column

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