Lab - used tubular membrane equipment has a compact structure and strong compatibility, and can be equipped with membrane cores made of different materials such as metal and ceramic. Due to its low required feed liquid volume and small circulation volume, it is suitable for experiments such as sterilization of small - batch fermentation broths and concentration of enzyme preparations. It can also complete experiments like clarification of animal and plant extracts and impurity removal of functional oligosaccharides. Its backwashing function facilitates maintenance, and the parameters obtained from experiments can serve as a reference for industrial design.