After continuous optimization, on February 25, Sinopec Hubei Fertilizer Co., Ltd. achieved breakthrough in the application of ethylene glycol third-generation hydrogenation catalyst, product yield increased to 93%, ethylene glycol production reached 600 tons per day, and the device achieved full load stability. run.
The hydrogenation catalyst is the core of the coal-based ethylene glycol technology. Beginning in early December 2018, Hubei Chemical Fertilizer, as the leader unit, continued to carry out the third-generation new hydrogenation catalyst application work with the Shanghai Petrochemical Research Institute and other members. The company has carried out nearly 10 technical research projects such as refining system process transformation, continuously reducing the impurity content, improving the UV value and yield of the product, and laying the foundation for upgrading and upgrading.
　　 On January 16, the ethylene glycol plant was charged 100%; on February 25, the product yield was increased to 93%, the ethylene glycol production was 600 tons per day, and the plant capacity reached 100%. In the next step, Hubei Fertilizer will continue to focus on process optimization and technical breakthroughs to ensure improved catalyst performance and product quality, and strive to improve development quality and efficiency.
Hubei's chemical fertilizer 200,000 tons / year synthesis gas glycol production technology development and industrial application projects is one of Sinopec's "Ten Dragons" project. The project is independently developed by Sinopec and replaces the traditional petroleum route to produce ethylene glycol, which is of great significance to Sinopec's development of coal chemical industry and Hubei chemical fertilizer product structure adjustment. After many rounds of technical research, the project has been “out of the dragon†in December 2017, and the products have been widely used in polyester production. (Zhang Aihong)
Another hearing on the same day, Jilin Petrochemical ethylene plant to get Shell to grant the "S-893 Catalyst 2015 --2018 global best practices award" medals, its ethylene unit S-893 catalyst reaching the world's highest run Level.
According to reports, among the 57 batches of similar products supplied by Shell Catalyst Technology Co., Ltd. , the selectivity of Jilin Petrochemical ethylene glycol plant catalyst ranked first with 87.9%, which also created the highest level of catalyst use in this device.
It is understood that Jilin Petrochemical ethylene glycol plant was replaced by Shell S-893 catalyst during the major overhaul in 2015. Since then, they have continued to explore and practice, summarizing the systematic management experience of catalyst operation optimization, and the catalyst selectivity has always remained high.
According to Yuan Baogang, the person in charge of the ethylene glycol plant, the selectivity of the catalyst will gradually decrease over time. How to optimize the operation to ensure that the catalyst is always in the best condition, which is related to the maximum input and output of the device. To this end, they organized technical personnel to continuously increase research and process optimization, and listed catalyst optimization as one of the key research projects, and strive to improve catalyst selectivity.
The technicians use the advantages of professional cooperation to monitor the operating parameters such as reaction temperature, steam production, EDC addition amount and selectivity, and draw trend curve to understand the running trend. By comparing with the prediction curve, master the catalyst operation, adjust the corresponding parameters in time, and constantly find the best control point.
They also combine the temperature change characteristics, timely adjust the circulating water temperature and the heating pressure, and change the EDC addition amount accordingly. Each adjustment range is strictly controlled within 0.5kg/h, effectively avoiding fluctuations in system parameters; continuously balancing direct steam and indirect steam The proportion of addition, keep the carbonate content in the system not less than 25%, effectively improve the decarburization effect of the 200# unit, and ensure that the carbon dioxide content in the circulating gas returning to the reaction unit does not exceed 0.8%, ensuring that the catalyst of the device is optimal. Operating status.
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