1.1 Vacuum Concentration Conditions:

In the pharmaceutical industry, vacuum pumps and vacuum systems are widely used in several critical processes, playing a vital role in ensuring drug quality and enhancing production efficiency. Vacuum concentration technology is particularly common during the concentration stage of drug extracts, proving especially effective in antibiotic manufacturing.
Different types of antibiotics have unique concentration principles and operational conditions. Take penicillin antibiotics as an example: penicillin is relatively unstable under acidic or high-temperature conditions. During the concentration of the extraction solution, the vacuum environment created by the vacuum pump plays a critical role. When the vacuum level reaches -0.09 MPa, the boiling point of water drops dramatically—from 100°C at standard atmospheric pressure down to around 40°C. As a result, the moisture in the penicillin extract rapidly vaporizes at this lower temperature. Meanwhile, the continuous pumping action of the vacuum system efficiently removes the water vapor from the system, enabling the concentration process to proceed smoothly. Under these optimal conditions, the vacuum pump not only lowers the boiling point of the solution but also maintains a stable vacuum level, ensuring that the concentration occurs at a controlled, safe temperature. This prevents penicillin from degrading due to excessive heat, thereby preserving both the product's activity and purity.
Concentration of tetracycline antibiotics is slightly different. The tetracycline molecule contains multiple active functional groups that are relatively sensitive to temperature and pH levels. During vacuum concentration, the vacuum pump lowers the boiling point, allowing the extract to be concentrated at lower temperatures. At the same time, by precisely controlling the degree of vacuum, the concentration rate can be carefully regulated. In the initial stages of concentration, increasing the vacuum level appropriately accelerates water evaporation, boosting overall efficiency. As the process continues, the vacuum level is gradually fine-tuned to enable further concentration of tetracycline under relatively mild conditions—preventing localized overheating or drastic pH fluctuations caused by overly rapid concentration—and ultimately preserving product quality.

Antibiotic pharmaceutical companies are adopting vacuum concentration systems—specifically, vacuum units composed of Roots vacuum pumps and liquid-ring vacuum pumps. The Roots pump stands out for its rapid gas-removal capability and ability to quickly achieve high vacuum levels, enabling the system to swiftly reach the desired operating range during the initial stages of concentration. Meanwhile, the liquid-ring pump excels in maintaining stable vacuum levels throughout the process, ensuring smooth and consistent operation from start to finish. As a result, the company has reduced the concentration time from the previous 10 hours under atmospheric pressure down to just 3 hours, while simultaneously boosting the retention rate of the product’s active ingredients from 70% to 90%. This innovative approach has significantly enhanced both product quality and overall production efficiency.

1.2 Vacuum Drying Conditions:

In the pharmaceutical industry, drug quality is directly tied to life and health, while production efficiency impacts a company’s profitability. Vacuum pumps and vacuum systems play a critical role in several key processes—particularly in the vacuum drying stage for moisture-sensitive medications.
Many pharmaceutical products—such as certain biologics and traditional Chinese medicine extracts—are highly sensitive to humidity. The presence of moisture can not only lead to deliquescence, mold growth, and compromise the appearance and stability of the drugs, but also accelerate degradation reactions in the active ingredients, reducing efficacy and even generating harmful impurities. Vacuum drying, by creating a low-pressure environment, allows moisture to evaporate rapidly from the product at lower temperatures. This method effectively avoids the drawbacks associated with conventional high-temperature drying processes, making it a critical step in maintaining the quality of these sensitive medications.

(1) Vacuum Drying of Biological Products

Take the influenza vaccine as an example—its main active ingredient consists of protein antigens found on the virus's surface, and these proteins are highly sensitive to temperature. In conventional drying environments, if the temperature exceeds 37°C, some proteins may undergo irreversible changes in their three-dimensional structure, significantly reducing antigen activity. However, during vacuum drying, as the vacuum pump increases the pressure inside the drying equipment to around -0.08 MPa, the boiling point of water drops dramatically from 100°C at atmospheric pressure to approximately 35°C. At this point, the moisture in the vaccine solution bypasses the liquid phase entirely, sublimating directly into vapor. The vacuum pump continuously removes the water vapor produced by sublimation, maintaining a consistently low-pressure environment that ensures continuous evaporation of moisture from the vaccine solution.
Before upgrading to a vacuum drying process, the vaccine manufacturing company used hot-air drying to dehydrate influenza vaccine solutions, a method that extended the entire drying cycle to as long as 8 hours. During this process, maintaining the hot-air temperature precisely below 37°C proved challenging, resulting in an antigen activity retention rate of only 70%. By switching to vacuum drying equipment—equipped with state-of-the-art vacuum pump systems—the drying time was dramatically reduced to just 3 hours. Testing by a recognized authority confirmed that the vaccine antigen activity retention rate soared to 95%, effectively ensuring the immunological efficacy of the vaccine throughout its shelf life. As a result, the product’s qualification rate increased from 85% to 98%, significantly boosting the company’s financial performance and enhancing its competitive edge in the market.

(2) Vacuum Drying of Traditional Chinese Medicine Extracts

Traditional Chinese medicine extracts are complex in composition. Take honeysuckle extract as an example—while it contains heat-sensitive active compounds like chlorogenic acid, it also includes volatile components such as essential oils. During vacuum drying, the vacuum pump creates a low-pressure environment around the material, significantly lowering the boiling points of both water and volatile substances. By precisely controlling the vacuum level between -0.06 MPa and -0.09 MPa and maintaining the temperature within the range of 40°C to 50°C, we can selectively promote the sublimation of moisture. At the same time, for volatile components like essential oils, carefully adjusted vacuum and temperature conditions allow them to evaporate slowly without being excessively degraded, ensuring that their beneficial properties are preserved as much as possible. Moreover, the vacuum environment minimizes the material's exposure to oxygen, effectively preventing oxidative degradation—particularly crucial for heat-sensitive compounds like chlorogenic acid, which are prone to oxidation under normal conditions.
In a traditional Chinese medicine extract manufacturing company, the conventional drying process for honeysuckle extract involved atmospheric drying, which took 10 hours. Unfortunately, high temperatures and exposure to oxygen resulted in a 30% loss of chlorogenic acid and about 40% loss of volatile oils. After introducing vacuum drying equipment equipped with a high-performance vacuum pump, the drying time was reduced to just 5 hours. Professional testing confirmed that the chlorogenic acid retention rate improved significantly to 90%, while the volatile oil retention reached 80%. As a result, product quality was dramatically enhanced, enabling the company to command higher prices in the market and gain broader customer recognition. Consequently, the company’s profits surged by 30% year-on-year.

1.3 Vacuum Distillation Conditions:

In active pharmaceutical ingredient (API) production, vacuum distillation is a critical technique for separating and purifying substances with different boiling points. This process relies on the principle that a substance’s boiling point decreases as atmospheric pressure drops. By using a vacuum pump to create a vacuum environment, efficient separation can be achieved. Different types of APIs have unique characteristics in terms of their vacuum distillation principles and operating conditions, and consequently, the role played by the vacuum pump varies accordingly.

(1) Vacuum Distillation of Steroid Drugs

Steroid drugs have complex molecular structures, and their production involves reaction mixtures with a wide variety of components. Take the manufacturing of common steroid hormone-based pharmaceuticals as an example: when isolating the target steroid compound from the reaction mixture, separating these substances proves particularly challenging under normal atmospheric pressure due to their closely matched boiling points. During vacuum distillation, the vacuum pump is activated, rapidly reducing the pressure inside the distillation apparatus. Once the vacuum reaches -0.095 MPa, the boiling points of the compounds drop significantly. As a result, two substances that previously differed by only about 20°C—making them nearly impossible to separate under standard conditions—now exhibit a much wider boiling-point gap. This allows them to vaporize sequentially at different temperatures. Meanwhile, the vacuum pump continuously removes the vaporized compounds, guiding them into a condenser where they are cooled and liquefied, effectively separating the desired steroid compound from unwanted impurities. Throughout this process, the vacuum pump not only lowers the system pressure, creating ideal conditions for separating substances at lower temperatures, but also maintains a steady pumping rate, ensuring the continuity and stability of the distillation process. This prevents fluctuations in pressure that could otherwise compromise the separation efficiency. In one particular steroid drug production facility, rotary vane vacuum pumps were employed for vacuum distillation, successfully boosting the product purity from 85% to 98%. This remarkable improvement has greatly enhanced the ability to meet the stringent quality standards required for high-grade pharmaceutical-grade raw materials.

(2) Vacuum Distillation of Antibiotic Drugs

Taking erythromycin production as an example, the extraction solution containing the target product also includes various impurities. Moreover, erythromycin itself is relatively sensitive to temperature. During vacuum distillation, the vacuum pump maintains the system at a pressure of approximately -0.08 MPa, allowing low-boiling-point impurities in the erythromycin solution to vaporize first. The vacuum pump swiftly removes these vapors, preventing them from re-entering the liquid phase. As distillation progresses and the temperature rises into the optimal range, erythromycin begins to vaporize at a relatively lower temperature. Thanks to the reduced boiling point under vacuum conditions, the risk of erythromycin decomposition at high temperatures is significantly minimized. Meanwhile, the vacuum pump precisely controls both the distillation temperature and pressure by adjusting the pumping rate, ensuring that erythromycin is separated under ideal conditions. At the same time, it efficiently evacuates the generated vapors, sustaining the efficiency of the entire distillation process. Compared to conventional atmospheric distillation, this vacuum distillation approach boosts erythromycin yield from 60% to 80%, while simultaneously increasing product purity from 90% to 95%. As a result, both production efficiency and product quality are markedly improved.