Catalysis for Fine and Specialty Chemicals

Joshi, Sunil S.; Bhatnagar, Anubhuti; Ranade, Vivek V.

doi:10.1016/b978-0-12-801457-8.00008-2

Cited by 30 publications

(24 citation statements)

References 90 publications

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“…For decades, heterogeneous catalysis has been widely utilized by industry for the production of commodity chemicals, with silica commonly employed as the solid support. 1 For example, the Phillips Triolefin Process for the metathesis of olefins, exploits a tungsten oxide catalyst supported on silica to convert ethylene and butenes to propylene. 2,3 Such processes allow for facile product separation from the catalyst bed and in many cases permit the reactants to be flowed.…”

Section: Introductionmentioning

confidence: 99%

Controlling the Surface Hydroxyl Concentration by Thermal Treatment of Layered Double Hydroxides

et al. 2017

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Layered double hydroxides (LDHs) are important materials in the field of catalyst supports, and their surface hydroxyl functionality makes them interesting candidates for supporting well-defined single-site catalysts. Here, we report that the surface hydroxyl concentration can be controlled by thermal treatment of these materials under vacuum, leading to hydroxyl numbers (α) similar to those of dehydroxylated silica, alumina, and magnesium hydroxide. Thermal treatment of [MgAl(OH)](SO)(CO)·0.62(HO)·0.04(acetone) prepared by the aqueous miscible organic solvent treatment method (MgAl-SO-A AMO-LDH) is shown to yield a mixed metal oxide above 300 °C by a combination of thermogravimetric analysis, powder X-ray diffraction (PXRD), BET surface area analysis, and FTIR spectroscopy. PXRD shows the disappearance of the characteristic LDH 00l peaks at 300 °C indicative of decomposition to the layered structure, coupled with a large increase in the BET surface area (95 vs 158 m g from treatment at 275 and 300 °C, respectively). Titration of the surface hydroxyls with Mg(CHPh)(THF) indicates that the hydroxyl number is independent of surface area for a given treatment temperature. Treatment at 450 °C under vacuum produces a mixed metal oxide material with a surface hydroxyl concentration (α) of 2.14 OH nm similar to the hydroxyl number (α) of 1.80 OH nm for a sample of SiO dehydroxylated at 500 °C. These materials appear to be suitable candidates for use as single-site organometallic catalyst supports.

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Section: Introductionmentioning

confidence: 99%

Controlling the Surface Hydroxyl Concentration by Thermal Treatment of Layered Double Hydroxides

et al. 2017

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“…In fact, it has been predicted that the market value of a bulk chemical is less than $10 kg −1 . On the other hand, fine chemicals are produced in limited volumes (<1000 tons per year) but at relatively high prices (>$10kg −1 ) (Joshi and Ranade, 2016). Based on this, at least for now, the commercialization of fine aromatic compounds will emerge with more successes (Cao et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Bioprocess Optimization for the Production of Aromatic Compounds With Metabolically Engineered Hosts: Recent Developments and Future Challenges

Braga

Faria

2020

Front. Bioeng. Biotechnol.

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The most common route to produce aromatic chemicals-organic compounds containing at least one benzene ring in their structure-is chemical synthesis. These processes, usually starting from an extracted fossil oil molecule such as benzene, toluene, or xylene, are highly environmentally unfriendly due to the use of nonrenewable raw materials, high energy consumption and the usual production of toxic by-products. An alternative way to produce aromatic compounds is extraction from plants. These extractions typically have a low yield and a high purification cost. This motivates the search for alternative platforms to produce aromatic compounds through low-cost and environmentally friendly processes. Microorganisms are able to synthesize aromatic amino acids through the shikimate pathway. The construction of microbial cell factories able to produce the desired molecule from renewable feedstock becomes a promising alternative. This review article focuses on the recent advances in microbial production of aromatic products, with a special emphasis on metabolic engineering strategies, as well as bioprocess optimization. The recent combination of these two techniques has resulted in the development of several alternative processes to produce phenylpropanoids, aromatic alcohols, phenolic aldehydes, and others. Chemical species that were unavailable for human consumption due to the high cost and/or high environmental impact of their production, have now become accessible.

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“…It is not possible to do a justice to the subject by including a short subsection in this note. Instead, we refer readers to Joshi and Ranade [7] and references cited therein for gaining deeper appreciation and advances in this area. We would like to mention here two different examples of catalyst designs for the purpose of illustration.…”

Section: Catalyst Designmentioning

confidence: 99%

Intensifying Multiphase Reactions and Reactors: Strategies and Examples

Utikar

Ranade²

2017

ACS Sustainable Chem. Eng.

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Intensification is intrinsic to better chemical and process engineering and has always been used in practice. Multiphase reactions and reactors are ubiquitous in chemical and allied industries and are of great economic and ecological importance. There is a great scope for intensifying multiphase reactions and reactors for realizing productivity enhancements, which are crucial for sustainable manufacturing. These enhancements can be in terms of increased throughput; better yield, conversion, and selectivity; smaller environmental footprint; and intrinsically safer operations. The advances in intensified reactors especially micro-reactors and microfluidic devices have created significant awareness about intensification in recent decades. In this note, we discuss different strategies for intensifying multiphase reactions and reactors based on the published information. Variety of tools and examples are presented to showcase the potential of intensification. We have found the efforts towards intensification of multiphase reactions and reactors very rewarding academically as well as professionally. We hope that this note will further stimulate interest in this area and pave the way towards realizing next generation productivity for chemical and allied industries.

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Catalysis for Fine and Specialty Chemicals

Cited by 30 publications

References 90 publications

Controlling the Surface Hydroxyl Concentration by Thermal Treatment of Layered Double Hydroxides

Controlling the Surface Hydroxyl Concentration by Thermal Treatment of Layered Double Hydroxides

Bioprocess Optimization for the Production of Aromatic Compounds With Metabolically Engineered Hosts: Recent Developments and Future Challenges

Intensifying Multiphase Reactions and Reactors: Strategies and Examples

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