【Ten Years of Great Progress in Chemical Technology】The world’s first cyclohexane dehydrogenation unit was put into operation from 2019 to 260

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Ten years of rapid development in chemical engineering technology – praising the prosperity and strength of modern China. This is just a starting point; more participation will make things even more interesting. With you here, HaiChuan becomes even better. [Ten Years of Development in Chemical Engineering Equipment] – continuous updates and summaries available; feel free to join the discussions at https://bbs.hcbbs.com/thread-3576046-1-1.html. Enhance quality awareness and promote high-quality development. ----------------------------------------- At 9:36 on September 19, 2019, the production facility designed by Beijing Petrochemical Engineering Co., Ltd., based on the “green and efficient hydrolysis-coupling process” (the 180,000-ton/year cyclohexane dehydrogenation plant in Fujian Yongrong), was successfully commissioned for the first time, with all product yields and purities meeting the design specifications. The process technology used in this project was jointly developed by Beijing Petrochemical Engineering Co., Ltd., Fujian Yongrong Technology Co., Ltd., and Beijing Saino Shifei Petrochemical Technology Co., Ltd. This device is the world’s first industrial-scale application of this technology, filling a gap in both domestic and international markets. The hydrogen purity produced by this device reaches 99.33%, while the yield of benzene product is over 94%. The project owner is Fujian Yongrong Technology Co., Ltd., located in the Meizhou Bay (Shimen’ao) Industrial Park in Xiuyu District, Putian City. It is responsible for building and operating a project with an annual production capacity of 600,000 tons of caprolactam, in order to supply raw materials to downstream textile enterprises. It is understood that on a global scale, the main production process for caprolactam plants involves hydrogenating and oxidizing the raw material benzene to produce **; thereafter, ** is subjected to ammonoximation and reduction processes to yield caprolactam. During the production of **, cyclohexane, a by-product, is also generated, which results in an effective utilization rate of benzene as a raw material of only around 75%. The issue of utilizing the by-product cyclohexane has always been a challenge for companies that produce caprolactam. Almost all of these companies choose to sell it at low prices, which in turn introduces risks related to material storage and transportation, thereby increasing the operating costs of the companies. The process principle of Fujian Yongrong Technology Co., Ltd.’s 180,000 tons per year cyclohexane dehydrogenation unit (using a green and efficient hydrolysis-based **coupled process) is to convert cyclohexane, which is a by-product of this unit, into benzene and hydrogen under specific temperature and pressure conditions, with the help of catalysts. Both benzene and hydrogen can be fed back into the **facility as raw materials, allowing the by-product cyclohexane to be utilized effectively. This enables a closed-loop cycle of raw materials and products, achieving green, environmentally friendly, efficient, energy-saving operations with no waste generation. It also reduces the need to purchase benzene externally and lightens the load on the hydrogen production facilities. The successful commissioning of this facility has increased the utilization rate of benzene as a raw material from 75% to over 99%, thereby generating significant economic benefits. It has solved the global problem of low raw material utilization rates in such facilities, bringing about substantial progress for the caprolactam industry. At the same time, it has opened up new business areas for Beijing Engineering Company, enhancing the company’s core competitiveness.