Liquid liquid extraction method8/12/2023 ![]() mixing intensity required to generate good phase dispersion.When lab-testing the extraction process, gather the following pieces of data: In addition to obtaining raw equilibrium data, it is just as important to observe the phase behavior of the system, especially for selecting the right type of column for scaleup and developing a test plan for that column. You can do this in several ways, one of which is outlined in Ref. Laboratory work prior to pilot testingīefore pilot plant testing, the first step in developing an extraction process is selecting the solvent and generating equilibrium data ( e.g., distribution coefficient vs. This method does require some experience, but when it is applied correctly, it can ensure that an extraction column is optimally designed and performs as required. This article presents a step-by-step method for pilot plant testing that saves both time and material. However, for pilot plant testing, experimental design requires significant amounts of feed and solvent and can take a long time. For basic research and development (R&D) work, experimental design is a well-proven and accurate method for process optimization. It is generally desirable to minimize the amount of waste material generated during pilot plant testing.įor those reasons, it is important to implement an optimized pilot plant testing method that can be completed in a short time frame using minimal amounts of feed and solvent. Often, testing must be done quickly to meet deadlines. Because the solvent is usually a recycle stream, the solvent will generally not be pure during actual commercial operation. Often, very little, if any, actual feed material is available. During process development work, pilot plant testing is often hindered by several factors, which include: This article focuses on optimizing the pilot plant testing methodology. Perform a pilot plant test to generate the data for accurate scaleup to the production column. ![]() ![]() Use this information and the project requirements to select the column type.Select the solvent and generate liquid-liquid equilibrium data.In general, the design process consists of the following steps (2): Performing pilot plant testing with actual feed liquid, and then relying on known scale-up correlations to size the column, is one of the best and most reliable methods of determining the specific extraction column best suited for an application (1). Pilot plant testing is an integral part of designing a liquid-liquid extraction (LLE) column. This article describes how to optimize pilot plant testing. When designing a liquid-liquid extraction column, pilot plant testing generates the data necessary for accurate scaleup to the production rate. This article is based on a presentation at the AIChE Spring Meeting, San Antonio, TX (March 2017). ![]()
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