An improved falling‐film reactor for viscous liquids

Talens, F. I.; Gutierrez, J. M.; Mans, C.

doi:10.1007/bf02517987

Cited by 7 publications

(3 citation statements)

References 9 publications

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“…In sulfonation of toluene, the selectivity to the m ‐isomer increases with the increase of reaction temperature and low selectivity to the m ‐isomer is preferentially considered, so the large amount of reaction heat must be removed simultaneously. However, the very limited gas–liquid interfacial area of an FFR is far from sufficient for the simultaneous removal of so large amount of reaction heat to maintain the required low reaction temperature 11. 12 In addition, the high vapor pressure of toluene (the boiling point of toluene is ca 110 °C while that of dodecylbenzene is ca 331 °C) also makes it unsuitable to conduct the sulfonation reaction in an FFR.…”

Section: Resultsmentioning

confidence: 99%

Production of p‐toluenesulfonic acid by sulfonating toluene with gaseous sulfur trioxide

Wang

Zhang

et al. 2001

J of Chemical Tech & Biotech

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Toluene was sulfonated by gaseous sulfur trioxide to prepare p-toluenesulfonic acid. The effects of reaction temperature and toluene conversion on the isomer selectivities and the dynamic viscosity of the reaction mixture in a well-stirred tubular glass reactor of 4 cm diameter and 16 cm height were investigated. Lower selectivity to the m-isomer was obtained at lower reaction temperature and lower conversion of toluene, whereas the selectivity to the p-isomer seemed to be less affected by these parameters. With the increase in toluene conversion a sharp increase in viscosity of the reaction mixture was observed, which was attributed to the saturation of the toluenesulfonic acids dissolved in toluene. A pilot-scale stainless steel jet loop reactor (JLR) of 0.3 m diameter and 4 m height with an external cooler was constructed and used for the continuous sulfonation of toluene. It was found that the JLR was very effective for the fast removal of the large amount of reaction heat, and selectivities to the p-isomer around 85% and to the m-isomer below 1.2% were obtained.

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Section: Resultsmentioning

confidence: 99%

Production of p‐toluenesulfonic acid by sulfonating toluene with gaseous sulfur trioxide

Wang

Zhang

et al. 2001

J of Chemical Tech & Biotech

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“…Conventionally, the fluid−fluid reactions are carried out using agitated (mechanical, bubble), centrifugal, , column (packed, , plate, , vibrating plates, buss loop, , etc. ), tubular (straight, coiled), and film reactors as shown in Figure . The contacting principles are bubbling, filming or spraying of one fluid into the other.…”

Section: Conventional Multiphase Reactorsmentioning

confidence: 99%

Microstructured Reactors for Multiphase Reactions: State of the Art

Kashid

Kiwi‐Minsker

2009

Ind. Eng. Chem. Res.

203

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The manufacture of chemicals in microstructured reactors (MSR) has become recently a new branch of chemical reaction engineering focusing on process intensification and safety. MSR have an equivalent hydraulic diameter up to a few hundreds of micrometers and, therefore, provide high mass-and heat-transfer efficiency increasing the reactor performance drastically, compared to the conventional one. This article provides a comprehensive overview of the state of the art of the MSR applied for multiphase reactions. The reactions are classified based on the number of phases involved: fluid-fluid, fluid-solid, and three phase reactions. In the first part of the review, limitations of conventional reactors are discussed in brief. Furthermore, different types of MSR and their advantages with respect to their conventional counterparts are described. Particular attention is given to the identification of the parameters that control the flow pattern formed in microcapillaries regarding the mass-transfer efficiency. Case studies of various multiphase reactions carried out in MSR are discussed in detail.

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“…The experimental conditions were the same in all the experiments, except the inert gas flow rate. This is the basis of variable section falling film reactors [7]. Considering the pattern shown in Fig.…”

Section: Waviness and Conversion In The Reactormentioning

confidence: 99%

The Effect of Superficial Gas Velocity on Wavy Films and its Use in Enhancing the Performance of Falling Film Reactors

Talens-Alesson¹

2000

Chem. Eng. Technol.

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Mass transfer in co‐current downward annular flow depends on the amount of liquid carried by the waves. The thickness of this portion of the liquid film increases with the superficial gas velocity up to about 20–25 m s–1 for two‐phase air/water flow. The maximum apparent friction factors observed in air‐water annular flow also appear at superficial air velocities about 20–25 m s–1. Organic compounds, like fatty alcohols and alkylbenzenes, show a maximum apparent friction factor at lower superficial gas velocities. The gas velocity at which a maximum friction factor occurs is dependent on the surface tension, appearing at lower gas velocities for liquids with lower surface tensions. Progressive increases of the superficial gas velocity can be used to graduate the mass transfer along a falling film device.

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An improved falling‐film reactor for viscous liquids

Cited by 7 publications

References 9 publications

Production of p‐toluenesulfonic acid by sulfonating toluene with gaseous sulfur trioxide

Production of p‐toluenesulfonic acid by sulfonating toluene with gaseous sulfur trioxide

Microstructured Reactors for Multiphase Reactions: State of the Art

The Effect of Superficial Gas Velocity on Wavy Films and its Use in Enhancing the Performance of Falling Film Reactors

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