Differences between Open Cycle and Closed Cycle Spray Dryers
Spray drying is one of the most widely used technologies in industries such as food, pharmaceutical and chemical to obtain powder products from liquid solutions. However, choosing between a closed-loop or open-cycle spray dryer can make a big difference in efficiency, safety and quality of the final product. In this article, we explain the key differences between the two systems and which is the best choice for your business.
How Does an Open Cycle Spray Dryer Work?
The open cycle spray dryer is the most common in the industry. Its operation consists of:
- Introduce hot air into the drying chamber to evaporate the solvent from the product.
- Expel the humid air to the outside after the process.
- Obtain a dry powder with specific characteristics according to temperature and air flow parameters.
This system is ideal for non-flammable and oxygen-sensitive products such as dairy products, instant coffee and protein powders. Its main advantage is its simplicity and low operating cost, although it has limitations when handling organic solvents or oxidation-sensitive products.
What is the Difference between a Closed Loop Spray Dryer and a Closed Circuit Spray Dryer?
The closed-loop spray dryer operates with an inert gas (usually nitrogen) instead of air, which offers key advantages:
- Improved safety: By avoiding oxygen in the process, it reduces the risk of explosion when working with flammable solvents.
- Solvent recovery: Allows recovery and reuse of evaporated solvents, reducing costs and waste.
- Increased product stability: Ideal for oxidation-sensitive substances such as active pharmaceutical ingredients and flavorings.
- Compliance with demanding regulations: Facilitates certification in regulated industries such as pharmaceutical and chemical.
This system is perfect for applications where strict control of the environment and gas composition in the drying chamber is required.
What is the Best Option for your Business?
The choice between an open-cycle or closed-loop spray dryer depends on the specific needs of each industry:
- If you are looking for an economical process and handle non-flammable products, the open cycle is the best option.
- If you work with volatile solvents, sensitive products or need greater safety, the closed circuit is the ideal choice.
Both systems have specific applications and choosing the right one will depend on factors such as safety, solvent recovery and product quality. Investing in the right equipment will ensure efficiency, regulatory compliance and a better end product.
If you need advice to select the best spray dryer for your company, contact us and optimize your production with the right technology.