With the rapid advancement of modern technology and the increasing consumer demand for food freshness, traditional refrigerator preservation methods based solely on "low temperature + humidity" have begun to show limitations. In recent years, nitrogen-based preservation technology has become a focal point due to its significant antioxidant and antibacterial effects. Among various approaches, membrane-based nitrogen separation has gained particular favor for its high efficiency, energy savings, and stable performance.
Membrane-based nitrogen separation is based on the principle of membrane separation. When a mixture of two or more gases passes through a polymer membrane, differences in solubility and diffusion coefficients among the gases result in different permeation rates. Under a pressure difference across the membrane, gases with faster permeation rates—such as water vapor, oxygen, and carbon dioxide—are enriched on the permeate side, while gases with slower permeation rates—such as nitrogen, carbon monoxide, and argon—are enriched on the retentate side, thereby achieving gas separation. When pressurized clean air is used as the feed gas, inert gases like nitrogen are enriched to produce a high-purity nitrogen stream, while the permeate side discharges oxygen-enriched air. Compared with cryogenic separation and pressure swing adsorption (PSA), membrane-based nitrogen enrichment offers advantages such as simple operation and continuous, stable performance.
Compared with traditional temperature- and humidity-controlled preservation methods, membrane-based nitrogen separation uses hollow fiber membranes made of specialized polymer materials. By exploiting the difference in permeation rates between oxygen and nitrogen molecules, it directly separates high-purity nitrogen (purity up to 99.5% or higher) from ambient air. Its main advantages are as follows:
Precise preservation: By accurately controlling the nitrogen-to-oxygen ratio inside the refrigerator, the technology enables customized preservation conditions for different types of food, maximizing the retention of original taste and nutritional value.
Extended shelf life: A nitrogen-rich, oxygen-depleted environment significantly slows down the oxidation process of food, thereby extending its freshness. This is especially important for foods that require long-term storage.
Energy-efficient and environmentally friendly: The membrane separation process is simple to operate and requires no additional energy consumption, aligning with modern households' pursuit of energy efficiency and environmental protection.
Easy to operate: The system is user-friendly and does not require complex maintenance, reducing the cost of use for consumers.
Broad applicability: The technology is suitable not only for household refrigerators but also for commercial cold storage, cold chain logistics, and other scenarios requiring freshness preservation.
High efficiency and stability: The membrane separation module efficiently separates nitrogen from other gases (such as oxygen and carbon dioxide).
Long service life: Membrane separation modules generally have a long service life and relatively low maintenance costs. Due to their simple structure and lack of moving parts, they rarely malfunction or break down.
Guochu Technology, an innovative company focusing on membrane separation technology, has achieved notable results in membrane-based nitrogen separation. The company's nitrogen-enrichment membrane technology uses an advanced membrane separation system to efficiently separate nitrogen for application in refrigerator freshness preservation.
Since its establishment, Guochu Technology (Xiamen) Co., Ltd. has been committed to membrane separation technology as its core, promoting novel separation technologies and continuously exploring new applications in biopharmaceuticals, microelectronics, metallurgy, chemical engineering, machinery, food, dairy, beverages, environmental protection, and other fields. The company provides customized filtration and purification solutions tailored to the highly differentiated needs of various clients, improving product quality and meeting customer requirements.
