Extraction of dye from aqueous solution in rotating packed bed

Area of Science:

• Chemical Engineering
• Separation Processes

Background:

• Liquid-liquid extraction is crucial for chemical separations.
• Conventional extractors can be large and inefficient.
• Rotating packed beds (RPB) offer potential for intensified separation processes.

Purpose of the Study:

• To investigate the impact of centrifugal acceleration on mass transfer in liquid-liquid extraction.
• To evaluate the performance of a rotating packed bed (RPB) contactor for methyl red extraction using xylene.
• To determine optimal operating conditions for enhanced mass transfer efficiency.

Main Methods:

• Experimental investigation of methyl red extraction in an RPB contactor.
• Systematic variation of rotational speed (300-900 rpm) and phase flow rates.
• Analysis of mass transfer performance and stage efficiency.

Main Results:

• Centrifugal acceleration in RPB significantly influences mass transfer rates.
• Maximum stage efficiency of approximately 0.98 was achieved at an aqueous to organic flow rate ratio of 10.
• Mass transfer performance was directly correlated with rotational speed and flow rate parameters.

Conclusions:

• RPB contactors demonstrate superior mass transfer efficiency compared to conventional extractors.
• The use of RPB can reduce the required equipment volume by an order of magnitude for specific separations.
• This technology holds promise for process intensification in liquid-liquid extraction.