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The effect of microfluidic reactor dimensions and cross section geometry on hydrodynamics, conversion and selectivity was studied
for gas-liquid two-phase flow reactors. Indan oxidation at 100–160 °C and 300 kPa O2 was employed to study the impact of
hydrodynamics on conversion and product selectivity. Microfluidic reactors of different dimensions...
Contexts in source publication
Context 1
... list of chemicals used in the study is provided in Table 2. Indan, a five-member ring naphthenic-aromatic hydrocarbon, was selected as the model hydrocarbon. ...Context 2
... ratio in primary oxidation products were calculated considering sum of ketones in primary oxidation products (1-indanone and 2-indanone) and sum of alcohols in primary oxidation products (1-indanol, 2-indanol). Response factors of the products are listed in Supplemental Information (Table 2S). ...Citations
... Halfelliptical shaped microfluidic reactor have better temperature control compared to the square and rectangular reactor shapes. [37] The main reason of disruptive heat transfer characteristics is the presence of minimum and maximum film thickness in the edge of rectangular reactor surrounding the gas bubbles. The liquid present in the edge can make the differences in temperature control. ...
... In addition to the primary oxidation products such as alcohol and ketones, secondary products (multifunctional groups containing products such as diketone or dialcohol) and addition products (heavier products or dimerized products) could also form during the oxidation process. [5,37] Selectivity of the products depends on the oxygen available in the system ( Figure 5). Manipulation of oxygen availability closer to R * via microfluidic reactor design and operation would influence the propagation and termination steps and hence product selectivity. ...
... Experiment performed in microfluidic reactor showed that the induction period can be significantly reduced by manipulating gas-liquid interfacial area (a) ensuring very high oxygen availability. [5,37] Higher oxygen availability has lowered the induction time which is reflected in the comparative data shown Table 4. By comparing Series A and Series R5, it is clear that microfluidic reactor required only 1.5 min for 0.74 wt/wt % conversion whereas semi-batch reactor required 15 min (induction time was 14 min) to get 0.5 wt/wt % conversion for tetralin oxidation at 150°C. ...
Liquid phase oxidation (LPO) of hydrocarbon is an industrially important process to produce petrochemicals and pharmaceuticals. It follows a free radical path having initiation, propagation and termination. The initiation step is slow while the propagation and termination steps are fast. The main challenge of such process is to control product selectivity at an appreciable conversion level. With the advancement of microfluidic reactor technology, it is possible to control the free radical steps. The present contribution critically reviewed the reaction engineering aspects of LPO of hydrocarbon, the influence of microfluidic reactor design and operation on reaction mechanism, conversion and product selectivity. It also outlines the challenges associated with microfluidic reactor operation, and prospects to apply the understanding from microfluidic reactors in few sectors. The understanding from the free radical oxidation process can also be applied to any other free radical processes. Reactor size, configuration and hydrodynamics greatly influence the oxygen availability and mixing within the reactor, and hence, influence the conversion and product selectivity during liquid phase oxidation of hydrocarbon.
Substantial amounts of low‐value light petroleum fractions and low‐value heavy petroleum fractions, such as light naphtha, HVGO, and vacuum residue, are generated during the upgrading and refining of conventional and unconventional petroleum resources. The oil industry emphasizes economic diversification, aiming to produce high‐value products from these low petroleum fractions through cost‐effective and sustainable methods. Controlled autoxidation (oxidation with air) has the potential to produce industrially important oxygenates, including alcohols, and ketones, from the low‐value light petroleum fractions. The produced alcohols can also be converted to olefin through catalytic dehydration. Following controlled autoxidation, the low‐value heavy petroleum fractions can be utilized to produce value‐added products, including carbon fiber precursors. It would reduce the production cost of a highly demandable product, carbon fiber. This review highlights the prospect of developing an alternative, sustainable, and economic method to produce value‐added products from the low‐value petroleum fractions following a controlled autoxidation approach.
