Spent Caustic Regeneration in a Rotating Packed Bed: Reaction and Separation Process Intensification

Abstract

Regeneration of spent caustic from liquefied petroleum gas sweetening in refineries is significant to save resources and reduce solid waste emissions. Conventional regeneration technologies have been widely used, but these technologies usually have a reactor and a separator in series which occupies a large space. In this work, simultaneous reaction and separation processes were proposed to be conducted in a rotating packed bed (RPB), aiming for the process intensification of spent caustic regeneration. Experimental results of laboratory tests show that the regeneration processes of mercaptide oxidation and disulfide separation were efficiently enhanced in the RPB. The side-line test, treating the actual spent caustic from a refinery, could achieve good performance for a long-time running. An artificial neural network model was applied for parameters analysis and prediction of the regeneration performance. This work demonstrated the feasibility of spent caustic regeneration in only one RPB unit, which displays bright prospects for industrial application.

Scale-Up of a Rotating Packed Bed Reactor with a Mesh-Pin Rotor: (II) Mass Transfer and Application

“…A rotating packed bed (RPB) reactor, a typical process intensification equipment, achieves a high gravity environment by a high-speed rotating rotor. , In the RPB reactor, numerous diminutive liquid elements, containing tiny liquid droplets, fine filaments, and thin films, were generated, exhibiting excellent micromixing and mass transfer performance. RPB reactors have received extensive attention worldwide owing to the advantages of small size, low investment, safe operation, and high efficiency. − Furthermore, RPB reactors have been widely utilized in absorption, desorption, distillation, wastewater treatment, VOC stripping, nanoparticle preparation, etc.…”

Optimized Artificial Neural Network for Evaluation: C4 Alkylation Process Catalyzed by Concentrated Sulfuric Acid

“…Furthermore, the influence of input parameters on output parameters was obtained by parameter analysis from the optimal ANN model. Parameter analysis was obtained by multiplying weights between each layer, as shown in eq 10 , 28 and it is shown in Figure 6 . …”

“…Deep learning has made a significant progress in addressing the issues that have been resisting the artificial intelligence community for many years, and it has been proven to be excellent in discovering a intricate structure of the multidimensional data. , There were kinds of successful applications in deep learning, such as crystal identification and discovery, thermodynamic properties prediction for complex materials, predictions of chemical reactions, process performances, − and so forth. The artificial neural network (ANN), as a typical sort of deep learning, is prevalently and widely employed in the chemistry and chemical industry. − The ANN can learn and adapt in response to the given input–output patterns and adjust itself to minimize the fitting error.…”

A cross‐flow rotating packed bed toward desulphurization of marine exhaust gas

“…A rotating packed bed (RPB) is a typical process intensification equipment that can greatly enhance the mass transfer and micromixing efficiency and reduce the reactor volume. [ 17 ] Chu et al employed counter‐current [ 18 ] and co‐current [ 10 ] RPBs to remove SO 2 by the CAD method. Compared with spray towers, their maximum removal efficiency reached 99.6% with a quarter reactor volume.…”