Fluorochemicals is a fine chemical branch that uses fluorite (calcium fluoride, CaF₂) as the core raw material and anhydrous hydrogen fluoride (AHF) as an intermediate to produce inorganic fluorides and organic fluorine chemicals. Due to its properties such as resistance to high and low temperatures, corrosion resistance, insulation, low friction, and chemical stability, the products are known as the "golden industry" and are key basic materials in fields such as new energy, semiconductors, high-end manufacturing, and environmental protection.
Sealing Challenges
1. Irreversible Material Failure Caused by Strong Corrosion and Penetration
Hydrofluoric acid and fluorine-containing small-molecule media can rapidly corrode conventional metals, destroying the molecular structure of traditional seals, causing material swelling, brittleness, and permanent deformation. At the same time, they easily penetrate micron-level sealing gaps, forming continuous micro-leakage, which is the core cause of seal failure.
2. Loss of Seal Stability Due to Coupled Extreme Operating Conditions
Fluorination reactions, distillation, polymerization, and other processes cover a wide range of operating conditions from high temperature and high pressure to high vacuum. These processes are accompanied by issues such as shaft eccentricity, high-speed rotation, and alternating stress. Traditional seals are prone to thermal deformation, liquid film instability, and compensation mechanism jamming, leading to a sharp drop in performance or even sudden failure.
3. Rigid Compliance Constraints of Zero Leakage Due to Highly Toxic Media
Most fluorochemical media are highly toxic, flammable, and explosive. Unorganized emissions of fluorine-containing VOCs face stringent environmental penalties. Traditional contact seals, due to operational wear, gradually form leakage channels, making it impossible to achieve long-term absolute zero leakage, directly posing safety and compliance risks.
4. The Dilemma of Operation and Maintenance Costs in Solid-Containing and Continuous Production Processes
Polymerization, crystallization, and other processes commonly involve fluorinated powders and crystalline particles, which can easily cause erosion, wear, blockage, and jamming of traditional seals, significantly shortening their lifespan. Furthermore, unplanned shutdowns of continuous fluorochemical production lines can result in losses of hundreds of thousands of yuan per day, and frequent maintenance and replacements further increase the total life-cycle cost and operational safety risks.
Solutions
1. Customized Fluorine-Resistant Full-system Materials, Addressing the Root Causes of Media Corrosion and Penetration
Targeting the characteristics of fluorochemical media, a customized perfluoropolyether-based fluorine-resistant magnetic liquid is used, combined with surface-fluorinated modified nano-magnetic particles, forming a chemically extremely stable colloidal system. This system does not react with any fluorochemical media and can form a stable sealed liquid ring under strong magnetic field confinement.
2. Customized Structural Design for Extreme Conditions, Ensuring Stable Operation Across All Scenarios
For the wide-ranging coupled conditions of fluorochemical processes, simulation optimization achieves precise adaptation: a circulating thermostatic jacket structure is provided for high and low temperature conditions, precisely controlling the temperature of the sealing cavity to prevent high-temperature volatilization and low-temperature solidification of the magnetic liquid; for high-pressure/high-vacuum conditions, the pole tooth parameters and magnetic field distribution are optimized.
3. Zero-Leakage Safety Closed-Loop System, Building a Solid Compliance and Safety Defense Line
The Ferrofluid Seal (Magnetic Fluid Seal) adopts a non-contact design, with no mechanical friction or wear during rotation. This fundamentally eliminates leakage channels caused by wear in traditional seals, achieving absolute zero leakage during long-term continuous operation and fully meeting the requirements for hazardous chemical safety and VOCs emission control.
4. Anti-pollution, long-cycle operation and maintenance solution, adaptable to the cost reduction needs of continuous production
For solid-containing multiphase flow conditions, a pre-protection system is constructed to prevent impurities from entering the main sealing cavity; equipped with anti-pollution magnetic liquid and self-cleaning flow field structure, even if trace particles enter, they can be entrained and discharged, avoiding scratches on the working surface, and can still maintain stable operation for more than 2 years under solid-containing conditions.
① Fluorochemicals
Fluorochemicals are a core foundational sector for strategic industries such as new energy, semiconductors, and high-end equipment manufacturing. Their production processes involve highly corrosive, highly permeable, highly toxic, flammable, and explosive media such as anhydrous hydrogen fluoride (AHF), hydrofluoric acid, tetrafluoroethylene, and fluoropolymer monomers. These processes are compounded by extreme conditions including high temperature and pressure, cryogenic high vacuum, solid-containing multiphase flow, and wide-range operating fluctuations, making it the area with the highest risk of seal failure and the greatest difficulty in control among process industries. Industry statistics show that 70% of safety and environmental accidents in the chemical industry are caused by seal failure. Due to the special nature of the media in fluorochemicals, the hazards, economic losses, and environmental penalties caused by seal failure increase exponentially.
Traditional seals are inherently limited by contact wear, material corrosion, and media penetration, and can no longer meet the rigid control requirements of zero leakage, long cycles, and high safety in the fluorochemical industry. Ferrofluid Seal (Magnetic Fluid Seal) technology, with its core characteristics of non-contact zero wear, absolute zero leakage, strong corrosion resistance, self-healing, and long life, systematically solves the sealing pain points of the fluorochemical industry from the perspectives of materials, structure, and principle, and has become the optimal sealing solution for extreme working conditions in the current fluorochemical industry.
② Hydrofluoric Acid
The core of hydrofluoric acid production involves five major stages: fluorite acidolysis → crude HF distillation and purification, tail gas treatment → waste acid treatment, high-purity HF refining → transportation and compression. The media throughout the process include anhydrous HF, aqueous HF, fluorosilicic acid, sulfuric acid, and fluorine-containing waste gas. The core challenges are strong corrosion, high permeability, high toxicity, vacuum/high pressure, high speed, solid-containing particles, and explosion-proof requirements. Traditional mechanical seals are prone to leakage, rapid wear, and short lifespan.
In hydrofluoric acid production, all rotating shaft dynamic seals, equipment involving HF/fluorine-containing media, and requiring zero leakage/long operating time/corrosion resistance must employ Ferrofluid Seal (Magnetic Fluid Seal). These seals are crucial for acidolysis reactors, distillation columns, HF compressors, vacuum pumps, high-purity refining equipment, and tail gas treatment agitators/pumps. This is the core sealing solution ensuring the safe, environmentally friendly, and stable operation of HF production.
English 
français 
Español 
العربية 
русский 
