Question 1

What is a pilot plant for vacuum drying?

Accepted Answer

A pilot plant for vacuum drying is a drying plant on a pilot or small series scale in which the vacuum drying of products (e.g. food, pharmaceuticals, chemical granulates or suspensions) is tested and developed under reduced pressures - before a large-scale plant is built. Examples and features: At reduced temperature and pressure, the water or solvent evaporates faster and more gently - ideal for heat-sensitive products. Control and optimization of parameters such as temperature, pressure, drying time, residual moisture on a small scale.Use in trial operation, feasibility tests, product development and scaling up to an industrial system. Particularly relevant for manufacturers who offer processes in the food or processing technology sector: here the pilot plant is used to validate drying processes and for technical validation. Advantage: lower risk at the start of the project, possibility of process optimization, better product quality and cost control. In short: the pilot plant is the test or development stage of an industrial vacuum drying plant.

Question 2

What advantages do pilot plants for vacuum drying offer for process development?

Accepted Answer

A vacuum drying pilot plant enables the precise determination of optimum process parameters for temperature, pressure and time. This allows processes to be reliably scaled and product qualities to be compared. Advantages at a glance: Precise control of the vacuum up to 100 mbar Low product temperatures for heat-sensitive materials Feasibility tests for drying before series production starts Database for drying process optimization and scale-up This makes the vacuum drying process more efficient, reproducible and economical.

Question 3

Which parameters can be individually adjusted in pilot systems for vacuum drying?

Accepted Answer

In a pilot drying system under vacuum, engineers can precisely vary key process variables in order to specifically influence drying results. These include Temperature ranges up to 150 °C Vacuum levels from 0.5 - 100 mbar Drying times depending on product moisture Control of the evaporation rate up to 5 kg/h This flexibility allows adaptation to product groups such as heat-sensitive materials, powders or granulates. The vacuum dryer thus provides reliable data for scale-up on a pilot scale and supports vacuum drying through process engineering in food and pharmaceutical applications.

Question 4

How does the size of the drying surface affect the performance of a vacuum drying pilot plant?

Accepted Answer

The drying surface of a pilot system for vacuum drying heat-sensitive products directly determines the evaporation rate and temperature distribution in the product. A larger surface area - up to 88 m² - enables higher throughputs and more even moisture removal, while smaller systems allow precise tests with small quantities of material. With the vacuum drying system as a scale-up test series, the surface area design provides decisive data for heat transfer and energy efficiency. This allows processes for heat-sensitive products or pharmaceutical batches to be reliably validated before they are transferred to industrial systems.

Question 5

What specific challenges are there when drying sticky or highly viscous products in pilot plants?

Accepted Answer

In the pilot plant for vacuum drying, pasty and highly viscous substances place special demands on product distribution and heat transfer. The combination of a controlled vacuum of up to 100 mbar and uniform surface heating creates a stable drying film without any loss of structure or aroma. In the vacuum dryer pilot plant for pharmaceutical products, smooth, heated belt or plate surfaces are used to prevent adhesion and achieve reproducible residual moisture. For food or protein concentrates, this technology ensures consistent product quality and precise process monitoring throughout the entire drying process.

Question 6

How can aroma stability be ensured during vacuum drying in pilot plants?

Accepted Answer

In a pilot plant for vacuum drying foodstuffs, flavor stability is ensured by precisely controlled process parameters. A constant pressure range between 0.5 and 50 mbar and a low product temperature below 80 °C are crucial in order to preserve volatile compounds. Technical measures: Use of closed systems with controlled vapor discharge Use of sorptive components such as zeolite modules to retain volatile aroma compounds Uniform heat distribution via heated plate surfaces This combination prevents oxidation and loss of aroma, ensuring that sensory properties remain stable even after prolonged storage.

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Pilot plants for vacuum drying for the development of new drying processes

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