[The Stone from Haichuan Mountain] Reduce the hydrogen pressure to extend the life of the hydrogenation catalyst

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Nanhua Company's antioxidant 6PPD hydrogenation catalyst service life has been extended to 62 months. Through continuous exploration and debugging, Nanhua Company's antioxidant 6PPD device has summarized a set of effective operating methods, which has extended the life of the hydrogenation catalyst from an average of 1-2 years to 62 months, leading the industry. With the change of the company's RT base process, the original catalyst cannot meet the production of 6PPD and 4010NA. In April 2013, the newly modified catalyst was put into use. The technical indicators changed greatly, and there was no production experience to draw from. The technical backbone of the device continued to explore, combined with the characteristics of the catalyst and reaction conditions, and after repeated tests, it was found that reducing the hydrogen supply pressure can make the activation of the catalyst more stable and economical. In 2014, the device stopped the hydrogen booster and reduced the system pressure from the original 4.5MPa to the company's direct hydrogen supply pressure of 3MPa. This not only extends the service life of the catalyst, but also makes the intrinsic safety of the equipment more obvious. The outage of the hydrogen compressor can save about 450,000 kilowatt-hours of electricity every year. Before, it was necessary to intermittently discharge hydrogen to stabilize the pressure. Now it uses hydrogen directly supplied by the company to avoid wastage of hydrogen. (Wu Qiuyan)