Pilot plant scale up technique is a method used to take laboratory experiments or developments and, through a series of pilot plant trials, scale them up to production level. This process involves taking laboratory results or research from test tubes, small scale batch experiments, and other similar activities and converting it into a viable commercial production process.

The steps involved in pilot plant scale up technique include:

1. Developing a detailed process design: This is the initial stage where a detailed process design is prepared for the pilot plant trial. This design is detailed enough to capture all aspects of the process flow and ensure that the pilot plant trial meets all the requirements of the production process.

2. Selecting the appropriate scale-up equipment: Depending on the size of the laboratory experiment and desired outcome, equipment must be carefully chosen to handle higher volumes, pressures and temperatures.

3. Conducting the pilot plant trial: This stage involves conducting the trial using the appropriate equipment and processes as per the process design. The objectives may include optimization of yield, purity, selectivity, and various parameters. During the trial, data is gathered, and problems encountered are recorded.

4. Analyzing the data and problem-solving: After data has been gathered from the pilot plant trial, problems encountered are addressed to prevent their occurrence in the future. This information aids in identifying potential problems in the production plant and can inform the modification of the pilot trial process design, where needed.

5. Scaling up: Once a successful pilot plant trial is completed, the process can then be scaled up for commercial production. This is done by applying the same process designs and equipment utilized in the pilot plant on a larger scale production plant process.

Pilot plant scale up technique is useful in creating a large-scale industrial process. It involves many complex steps, but it is an essential process that improves product quality, increases production rates, and provides a more efficient method of manufacturing products. It also helps researchers understand production and manufacturing processes in a better light.