The absorption tower for the succinic anhydride production unit at the Qingyang Tongxin project, with a capacity of over 600 tons, has been hoisted into place

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On July 18, with the absorption tower for maleic anhydride, weighing over 600 tons including the lifting gear, being accurately installed, the large-scale lifting project for the maleic anhydride facility at the Qingyang Tongxin project carried out by China State Construction Installation Petrochemical Engineering Company was successfully completed. With a diameter of 10.3 meters and a total height of 50 meters (including the pipelines attached to it), this \"giant\" equipment has set a new record for the lifting of single units in this project. It also indicates that 80% of the installation work related to these equipment units has been completed in terms of weight, laying a solid foundation for subsequent construction tasks. The maleic anhydride absorption tower being lifted this time is one of the core equipment in the plant; its bare weight is 360 tons, and with the addition of insulation for the equipment, ladder platforms, pipelines attached to the tower, and internal supports, its total weight reaches 520 tons. Faced with the challenges of lifting heavy, large-scale equipment, the engineering team employed super-large crawler cranes along with a specialized lifting plan. By accurately calculating the forces acting on the lifting points and monitoring wind speed changes in real time, they managed to position the equipment with zero deviation, ensuring safety and control throughout the process – thus demonstrating the team’s expertise in the installation of such large-scale equipment. As an important raw material for biodegradable plastics such as PBS, the production of maleic anhydride is of great significance for addressing global plastic pollution. As a key equipment in the production of maleic anhydride, the absorption tower plays an important role in purifying the reaction gases. Its working principle involves the counterflow contact between the lean solvent (DBP) sprayed from the top and the rising reaction gas inside the tower on the tray surfaces, thereby efficiently absorbing the maleic anhydride component from the mixed gas and forming a rich solution ； At the same time, the rich solution at the bottom of the tower is cooled to 48°C via a circulating cooling system before being recycled, thereby removing promptly the heat of dissolution released during the absorption process and ensuring stable absorption efficiency. The treated, clean exhaust gas will be sent to the exhaust gas treatment system to ensure emissions meet environmental standards. The Qingyang Tongxin Light Hydrocarbons Deep Processing Project is a key construction project in Gansu Province, and it has received significant attention from governments at all levels, both provincial and municipal, since its inception. This successful lifting marks an important milestone in the construction of the maleic anhydride project; it also represents a crucial transition for the facility from the stage of \"hardware installation\" to that of \"system installation\". Subsequently, work such as welding of process pipelines, installation of electrical and instrumentation systems, and integration testing of automation systems will be carried out on a full scale. Production testing is expected to begin within this year, thereby contributing significantly to the high-quality development of the modern integrated energy and chemical industry. As a key project in the regional chemical industry, the Qingyang Tongxinsun anhydride project calls for the construction of an anhydride production facility with an annual capacity of 150,000 tons. It also includes a BDO production facility with an annual capacity of 120,000 tons and a PBS production facility with an annual capacity of 30,000 tons; together, these facilities form the core of a 500,000-ton/year deep processing project for light hydrocarbons. The total investment in this project is 6.315 billion yuan, and it is located in the Xifeng Industrial Park of Qingyang City, covering an area of approximately 696 mu.