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| Linde process | |
|---|---|
| Name | Linde process |
| Inventor | Carl von Linde |
| Year | 1895 |
| Type | Gas liquefaction |
| Used for | Production of liquefied air, oxygen, nitrogen, argon, helium |
Linde process The Linde process is a refrigerative gas liquefaction method that uses cyclic compression and expansion to produce cryogenic liquids. The technique underpins modern industrial gas production, influencing Air Liquide, Linde plc, BASF, Siemens Energy and cryogenics used by CERN, NASA, Boeing, Airbus and MIT. It enabled large-scale supply chains for steelmaking, medical oxygen supply, semiconductor manufacturing, rocket propulsion and cryopreservation.
Developed to liquefy atmospheric gases, the method couples mechanical refrigeration with regenerative heat exchange and throttling to reach temperatures where gases condense. The process is historically linked to innovators such as Carl von Linde, contemporaries like Heike Kamerlingh Onnes, institutions including Technische Universität München, corporations like Linde plc and industrial adopters such as ThyssenKrupp. Its engineering principles inform designs at facilities run by Air Liquide, Air Products and Chemicals, Messer Group and research centers such as Harvard University and Stanford University.
Origins trace to late 19th‑century refrigeration advances by Carl von Linde and parallel work by James Joule, William Thomson (Lord Kelvin), Heike Kamerlingh Onnes and inventors at Siemens & Halske. Patents and demonstrations involved entities like Siemens, Linde AG, BASF and patent disputes influenced industrial growth in Germany, United Kingdom, United States and France. Scaling to bulk production intersected with demand from Bessemer process steelmakers, medical hospitals and early aeronautics firms including Wright brothers era suppliers. Subsequent improvements were driven by engineers at General Electric, Westinghouse Electric, Air Liquide and researchers at Imperial College London and ETH Zurich.
The method exploits Joule–Thomson cooling, isentropic expansion, regenerative heat exchange and phase equilibria described by van der Waals and real‑gas models developed by Johannes Diderik van der Waals and extended by researchers at NIST and National Physical Laboratory. Thermodynamic cycles reference concepts from Sadi Carnot, Rudolf Clausius, James Prescott Joule and Lord Kelvin. Key parameters use properties from tables maintained by IUPAC, NIST Chemistry WebBook and equations of state applied in software from AspenTech and Siemens PLM Software.
In industrial plants compressors from manufacturers such as Atlas Copco or Siemens pressurize ambient air; after purification stages performed by firms like Air Products and Messer Group, the stream passes through heat exchangers and throttling valves made by GE Oil & Gas and Sulzer. Regenerators using plate or mesh media exchange heat between incoming and outgoing flows, while valves enable Joule–Thomson expansion to achieve cryogenic temperatures used by users including CERN for superconducting magnets and SpaceX for propellant handling. The process integrates gas separation steps like cryogenic distillation practiced by Air Liquide and Linde plc to yield oxygen, nitrogen and argon for clients such as BASF, ArcelorMittal and Pfizer.
Variants include Claude process adaptations by Georges Claude, mixed‑refrigerant cycles deployed by Air Products, and hybrid configurations used by Thyssenkrupp and Messer Group. Applications span production for steel industry blast furnaces operated by Voestalpine, Tata Steel and Nippon Steel, medical supplies for hospital networks like Mayo Clinic and Mount Sinai Health System, inert gas feeds for semiconductor fabs owned by TSMC, Intel and Samsung Electronics, and cryogenic propellants for aerospace companies such as Blue Origin and NASA.
Cryogenic operations require protocols influenced by standards-setting bodies like ISO, ASME and OSHA, and are subject to regulation by agencies including EPA and EU Commission. Hazards include asphyxiation incidents similar to accidents investigated at facilities owned by Air Products and Linde plc; material embrittlement concerns reference findings from DNV and TÜV SÜD. Environmental impacts focus on energy consumption and greenhouse gas emissions regulated under frameworks like Paris Agreement and market mechanisms such as European Emissions Trading Scheme.
Economic drivers include capital investment by conglomerates such as Linde plc and Air Liquide, operating costs tied to electricity markets influenced by EIA and IEA, and supply contracts for industrial consumers like BASF and ArcelorMittal. Efficiency gains arise from larger heat‑exchanger surface areas developed by companies like Sulzer, advanced compressors from Siemens Energy, process integration practiced by McKinsey & Company consultants, and electrification strategies aligned with policy from European Commission and subsidies tracked by World Bank. Recent trends include optimization via process simulation tools from AspenTech and machine learning research from Google DeepMind and MIT to reduce specific energy consumption.
Category:Industrial processes