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How to Efficiently Dry High Viscosity Herbal Medicine Extracts Liquid?

Views: 38     Author: Site Editor     Publish Time: 2023-07-26      Origin: Site


In pharmaceutical production, drying is used in the dehydration of fresh medicinal materials, dehumidification of raw and auxiliary materials, and preparation of tablets and granules. Due to the different principles and methods of the drying process, the physical properties of the dried product and the transfer rate of the index components will be different, and these differences will directly affect the difficulty of the molding process. Therefore, it is of great significance to investigate some key issues of the drying process of traditional Chinese medicine extracts in the field of preparations.

Density, viscosity, pH value of traditional Chinese medicine extracts before drying, and powder hygroscopicity, water content, fluidity and other physical property evaluation indicators after drying form a systematic and comprehensive evaluation system to lay the foundation for future research work.

Drying traditional herbal medicine extracts or viscous liquids usually use drying equipment such as vacuum drying, spray drying, microwave drying, and freeze drying.

For liquids with high viscosity or high sugar content, the spray dryer usually encounters the following problems, such as the material sticking to the wall, the material liquid cannot be input into the tower body, and the atomizer is easy to block.

Vacuum dryers include high-efficiency vacuum dryers and microwave vacuum dryers. Microwave vacuum dryers have high efficiency but are easy to damage some components.

In this article, we will discuss the working principles, advantages, applications, and precautions related to different kinds dryers for high-viscosity materials.

Understanding Highly Viscous Materials

Highly viscous materials are substances that exhibit a thick and sticky consistency, often due to their high moisture content. Examples include adhesives, food products like honey or molasses, pharmaceutical compounds, and certain chemicals. The high viscosity of these materials hampers the removal of moisture using traditional drying techniques, requiring specialized equipment like vacuum dryers.

Challenges in Drying High Viscosity Herbal Medicine Extracts Liquid

Drying high viscosity herbal medicine extracts liquid presents several challenges. The dense nature of the liquid can hinder the drying process, and conventional drying methods may not be effective. Additionally, the sensitivity of herbal compounds to heat and oxidation must be considered to avoid degradation.

High Efficient Drying Techniques for High Viscosity Herbal Medicine Extracts Liquid

1. Spray Drying

Spray drying is a widely used method that involves atomizing the liquid into fine droplets and drying them quickly through hot air. It is a preferred technique for heat-sensitive compounds and can produce powders with good flow properties.

1.1. Introducing High Viscosity Chinese Medicine Extract Spray Dryer

The high-viscosity Chinese medicine extract spray dryer is an advanced drying equipment designed specifically for the processing of thick and sticky herbal extracts. Unlike conventional dryers, this state-of-the-art technology employs a unique approach to achieve efficient and gentle drying, retaining the therapeutic qualities of the herbal extracts.

1.2. How High Viscosity Spray Dryers Work

High viscosity spray dryer machines utilize a two-step drying process to handle the challenges posed by sticky extracts. In the first step, the liquid herbal extract is atomized into tiny droplets. Subsequently, these droplets are exposed to hot air in the drying chamber. As the droplets lose moisture, they transform into fine powder particles, ready for collection.

1.3. Advantages of High Viscosity Chinese Medicine Extract Spray Dryer

Preservation of Medicinal Compounds: The gentle drying process ensures that the active compounds in the herbal extracts remain intact, enhancing their medicinal value.

Improved Solubility: The spray-dried herbal powders exhibit excellent solubility, making them easier to incorporate into various formulations.

Enhanced Shelf Life: High viscosity spray drying extends the shelf life of herbal extracts by reducing moisture content and preventing degradation.

Time and Cost Efficiency: The rapid drying process significantly reduces processing time and energy consumption, leading to cost savings.

1.4. Applications in Traditional Medicine Processing

High-viscosity Chinese medicine extract spray dryer finds versatile applications in traditional medicine processing. It is extensively used in the production of herbal medicines, dietary supplements, and natural health products. Additionally, pharmaceutical companies are adopting this technology to create standardized and high-quality herbal formulations.

1.5. Ensuring the Quality and Potency of Herbal Extracts

Quality control is paramount in the herbal medicine industry. With high viscosity spray drying machine, manufacturers can consistently produce herbal extracts with uniform potency and efficacy. This helps maintain consumer trust and ensures the effectiveness of the final products.

1.6. Overcoming Challenges in Spray Drying of Herbal Extracts

Spray drying of high-viscosity herbal extracts poses certain challenges, such as nozzle blockage and particle aggregation. However, ongoing research and development in spray dryer technology are steadily overcoming these obstacles, making the process more efficient and reliable.

1.7. Innovations and Future Developments

As demand for traditional medicines continues to rise, the industry is witnessing constant innovation. Manufacturers are exploring ways to optimize high viscosity spray drying techniques further. Expectations are high for advancements that will make the process even more sustainable and eco-friendly.

1.8. Embracing High Viscosity Spray Dryer: A Step Towards Sustainable Herbal Medicine

The adoption of high viscosity Chinese medicine extract spray dryer represents a significant step towards sustainable herbal medicine processing. By maximizing the potential of herbal extracts and reducing waste, this technology aligns with the principles of green manufacturing and ecological preservation.

1.9. Spray drying machine video

2. High-efficiency vacuum tray dryer

Vacuum drying operates at low pressures, allowing for gentle drying of temperature-sensitive extracts. It is particularly suitable for extracts containing volatile components.

2.1. The High Viscosity Herbal Extract Vacuum Tray Dryer: An Overview

The High Viscosity Herbal Extract Vacuum Tray Dryer is a state-of-the-art drying equipment specifically designed to handle high-viscosity herbal extracts. It operates under low pressure, facilitating the evaporation of moisture at lower temperatures, thus preventing thermal degradation of the herbal compounds.

2.2 Key Features of the Vacuum Tray Dryer

Advanced Vacuum System: The dryer is equipped with an advanced vacuum system that ensures rapid moisture removal without compromising the quality of the herbal extract.

Uniform Drying: The vacuum shelf dryer's design ensures uniform heat distribution, resulting in consistent drying across all trays.

Temperature Control: The system allows precise temperature control, preventing overheating and maintaining the integrity of the herbal extract.

2.3. The Drying Process: Step-by-Step Guide

2.3.1 Preparing the High Viscosity Herbal Extract

Before the drying process, the high-viscosity herbal extract undergoes thorough filtration and purification to remove impurities and enhance its concentration.

2.3.2 Loading the Tray Dryer

The prepared herbal extract is evenly spread on the trays, taking care not to overcrowd them, which can impede the drying process.

2.3.3 Commencing the Vacuum Drying

Once the trays are loaded, the vacuum drying process begins. The low-pressure environment accelerates moisture evaporation, leaving behind a concentrated and potent herbal extract.

2.3.4 Monitoring the Drying Progress

During the drying process of the high-efficiency vacuum shelf dryer, it is essential to monitor the extract regularly. Adjustments to temperature and pressure might be required to optimize the drying efficiency.

2.4. Benefits of the High Viscosity Herbal Extract Vacuum Tray Dryer

Preservation of Nutritional Value: The low-temperature drying process ensures that the herbal extract retains its essential nutrients and bioactive compounds.

Increased Productivity: The efficient and rapid drying process significantly reduces the overall processing time, enhancing productivity.

Cost-Effective Solution: The vacuum tray dryer consumes less energy compared to conventional drying methods, resulting in cost savings.

2.5. Applications of the Vacuum Tray Dryer

The High Viscosity Herbal Extract Vacuum shelf Dryer finds applications in various industries, including:

Pharmaceutical Industry

Nutraceutical Industry

Herbal Medicine Production

Cosmetics and Skincare Industry

2.6 High efficieny vacuum dryer video

3. Freeze Drying

Freeze drying preserves the structure and activity of heat-sensitive compounds by first freezing the liquid and then removing the ice through sublimation under low pressure.

Herbal extracts are rich in vitamins, minerals, and bioactive compounds, making them valuable for various industries. Freeze drying offers several crucial advantages for preserving these extracts effectively.

3.1. Benefits of Freeze Drying Machines

3.1.1. Preservation of Nutritional Value

Traditional drying methods can cause significant nutrient loss. Freeze drying ensures that the herbal extracts retain their original nutritional content.

3.1.2. Extended Shelf Life

Freeze drying significantly extends the shelf life of herbal extracts compared to other drying methods, reducing wastage and increasing usability.

3.1.3. Retention of Natural Flavors and Aromas

The low-temperature process of freeze drying helps preserve the natural flavors and aromas of herbal extracts, enhancing their overall quality.

3.1.4. Minimal Loss of Active Compounds

Active compounds in herbal extracts can be sensitive to heat and air exposure. Freeze drying minimizes the loss of these compounds, ensuring the extracts' efficacy.

Stay tuned for the next part of the article, where we explore how freeze drying machines work and their applications in various industries.

3.2. How Freeze Drying Machines Work

Freeze drying machines are sophisticated equipment designed to facilitate the freeze drying process efficiently. Understanding the key stages of freeze drying can help us appreciate the complexity and precision involved in this preservation method.

3.2.1. Pre-Freezing

In this initial stage, the herbal extract liquid is frozen at extremely low temperatures. The extract is placed in trays or containers, and cold air is circulated around it. The freezing process converts the liquid into a solid state, preparing it for the subsequent drying phases.

3.2.2. Primary Drying

Once the extract is frozen, the freeze drying machine reduces the surrounding pressure, initiating sublimation. Sublimation is the phase transition from solid to gas, bypassing the liquid state. In this stage, the frozen water molecules in the extract transform directly into vapor, leaving behind the dried product.

3.2.3. Secondary Drying

The secondary drying phase involves raising the temperature slightly to ensure any remaining water molecules are removed. This step is crucial as even small traces of moisture can cause spoilage and reduce the shelf life of the herbal extract.

3.3. Applications of Freeze Dried Herbal Extracts

The versatility of freeze-dried herbal extracts has led to their extensive use in various industries. Let's explore some of the common applications:

3.3.1. Herbal Medicine and Supplements

Freeze-dried herbal extracts are widely used in the production of herbal medicines and dietary supplements. The preservation of their natural properties ensures that the final products are potent and effective in promoting health and well-being.

3.3.2. Cosmetics and Skincare

The beauty and skincare industry also benefits from freeze-dried herbal extracts. These extracts are incorporated into skincare products for their nourishing and rejuvenating properties, providing consumers with natural and safe alternatives to synthetic ingredients.

3.3.3. Culinary Industry

Chefs and food enthusiasts value the use of freeze-dried herbal extracts in the culinary world. The concentrated flavors and aromas enhance the taste of various dishes, adding a touch of nature's goodness to gourmet creations.


Highly viscous materials vacuum dryers provide an effective solution for drying challenging substances with high moisture content. The vacuum drying process offers advantages such as efficient moisture removal, preservation of product integrity, faster drying times, and homogeneous drying. Industries in the food, pharmaceutical, and chemical sectors can benefit from this specialized drying equipment. By considering factors like capacity, material compatibility, energy efficiency, and automation, businesses can choose the right vacuum dryer for their specific needs.

For the selection of high-viscosity liquid dryer, the following points are mainly considered:

1. The level of sugar content

2. The maximum drying temperature of the material

3. Viscosity

4. Does the liquid contain solvents?

For materials with high viscosity, high sugar content, and containing solvents, only vacuum tray dryers or freeze dryers can be used.


Q1: Which kind of dryer is more suitable for high-viscosity materials and flammable substances? 

This kind of liquid material can only use high-efficiency vacuum dryer or freeze dryer, but spray dryer is not suitable.

Q2: Do you use vacuum drying or spray drying for heat-sensitive materials? 

Vacuum drying is suitable for heat-sensitive materials because it operates at a lower temperature than traditional drying methods. This helps prevent heat damage to the material during drying.

Q3: Is the spray dryer suitable for all types of high-viscosity materials? 

While spray drying is effective for some viscous materials, the specific characteristics and requirements of the material in question must be considered. Some materials may have unique drying considerations that require further evaluation.

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