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Isothermal transformation technology expands coal chemical application
In a bid to promote energy-saving and emission-reducing technological innovations, and to speed up the modernization of nitrogen fertilizer and methanol production technologies, the China Nitrogen Fertilizer Industry Association recently organized an on-site meeting at Shanxi Yangmei Fengxi Linyi Company to discuss the application of isothermal transformation technology. Wang Wenshan, president of the association, emphasized that after over a century of development, Hunan Anzhen's ammonia conversion technology has made a historic breakthrough, and it is now time to accelerate its widespread adoption.
The isothermal transformation process was first introduced in the synthetic ammonia industry in 1913 and has since been widely applied in coal-to-methanol, coal-to-liquid, coal-to-natural gas, and coal-to-glycol projects. Over time, the technology has evolved from atmospheric pressure to pressurized systems, and from low-temperature to high-temperature reactions, including multi-stage reaction processes. However, current continuous clean coal gasification technologies still face challenges such as long processing times, complex operations, high energy consumption, large capital investment, and an inability to effectively handle high carbon monoxide content (≥75%).
Hunan Anzhen’s independently developed isothermal reforming process integrates a heat exchanger directly within the reactor catalyst bed. It uses by-product steam to remove reaction heat, enabling low-temperature, constant-temperature reactions in the catalyst bed. This results in a short process, with a conversion rate exceeding 98%, low resistance, minimal energy use, and simplified operation—requiring only one regulating valve to control the entire system by adjusting steam pressure. Following the successful utilization of high-concentration carbon monoxide tail gas in calcium carbide furnaces last year, this year’s isothermal transformation technology has expanded into the field of coal-based syngas.
Fengxi Linyi Company, one of the earliest enterprises to implement the industrial application of isothermal transformation technology, has seen significant improvements in its production process. The catalytic bed maintains a low temperature with minimal temperature variation across the plane. With an incoming carbon monoxide concentration of 45%–48%, the outgoing level drops to just 0.4%–0.6%, greatly enhancing the carbon monoxide conversion rate and demonstrating a strong practical effect.
Over 100 representatives from more than 40 chemical fertilizer and chemical companies—including Sinopec, CNOOC, Shanxi Yangmei, and Shanxi Jinmei—visited the site and unanimously praised the energy efficiency, short process, and high conversion rate of Hunan Anzhen’s technology. They believe the new process holds great potential for future adoption and will contribute significantly to the sustainable development of the industry.