Crystallization is one of the oldest known separation techniques in chemical engineering. It has found widespread applications in the fine chemicals, agrochemicals, food and pharmaceutical industries. However, crystallization is a complicated process and is not easy to control. In conventional crystallization, many of the phenomena’s like nucleation, growth and agglomeration are all interlinked to each other. Furthermore, product quality variations among batches of crystalline products is also observed due to the presence of undesired primary or secondary nucleation. In order to minimize primary nuclei and to improve seed crystal growth in seeded crystallization experiments, the metastable zone width of L-ascorbic acid was determined for the airlift crystallizer and compared to the stirred crystallizer. Batch cooling crystallization experiments were conducted to study crystal growth using a third order cooling profile. The results from the batch cooling crystallization experiments served to confirm the results of previous research and to help get a better understanding of the setup. Continuous crystallization processes claim to improve product quality by minimizing batch to batch variations. After the batch experiments, continuous cooling crystallization experiments were carried out using the airlift crystallizer to study the growth of L-ascorbic acid crystals in a continuous process. Process conditions were determined for the continuous cooling crystallization process in which, the crystal production could be improved per residence time while ensuring a constant supersaturation for the growth of the seed crystals. To disentangle crystal growth and supersaturation generation, the membrane module was coupled with the airlift crystallizer. Experiments were performed with the continuous membrane-assisted crystallization process to determine an effective strategy for production of high quality products. Furthermore, improvements were made to the selected strategy in order to stabilize the process. By determining the metastable zone width of L-ascorbic acid in the airlift crystallizer, seeded crystallization experiments could be performed in the absence of primary nucleation. In the batch cooling crystallization experiments, the product crystals grew to double the size of the seed crystals. For the continuous cooling crystallization experiments, a balance between the seed amount, residence time, production rate and supersaturation generation was determined. Lastly, an effective strategy for the continuous membrane-assisted crystallization process was determined and optimized which improved flexibility in operation, product quality and crystal production.