【Ten Years of Rapid Development in Chemical Equipment】1788–2015: China’s first butadiene off-gas hydrogenation unit was built by CCCC
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Happy May Day 2024 – safety first! Let’s give praise and support to the achievements made in China’s chemical engineering technology and equipment. **********************【Ten Years of Progress in Chemical Engineering Equipment】A continuously updated summary post; feel free to join the discussions at https://bbs.hcbbs.com/thread-3576046-1-1.html (Source: Haichuan Chemical Engineering Forum) ***************** On January 29, 2015, China’s first domestically developed butadiene off-gas hydrogenation unit was completed at Maoming Petrochemical. The designed production capacity of this project is 40,000 tons per year. Building a new 40,000-ton/year butadiene off-gas hydrogenation unit is a key project for Maoming Petrochemical to optimize the plant’s structure. The feasibility study for this project was approved in March 2011. The project mainly involves recovering the alkynes, dienes, and monoenes from the off-gases of the existing two butadiene plants, as well as from the etherified butane streams from the MTBE plants; these compounds are then hydrogenated to form butane alkanes, which can be used as a substitute for naphtha as a feedstock for cracking. Pile foundation construction for the project began on September 24, 2013, and it was completed on January 29, 2015. It is now in the intensive preparation phase for production, with commissioning expected in mid-February. Upon completion, the project will broaden the sources of ethylene raw materials and reduce the production costs of ethylene, thereby providing Maoming Petrochemical with new sources of profit growth.
In March 2019, China’s first retrofit project for butadiene off-gas hydrogenation units was completed and put into operation at the ethylene plant of Maoming Petrochemical. This facility utilizes domestic proprietary technology, and was designed, manufactured, and installed by domestic manufacturers. On February 28, the company organized relevant departments and units to verify the operational conditions for the reform project of the butadiene off-gas hydrogenation unit, and the project entered the stage of feeding materials for operation. On March 4, hydrogen was introduced to the device for catalyst activation ； On March 7, the unit was started up with feed materials ； The successful extraction of the product on March 9 marked a successful first start-up of the renovation project. Maoming Petrochemical has two DMF-based butadiene production units. Butadiene off-gas is the high-alkyne off-gas discharged from these butadiene units. Due to their high acetylene content, they are usually sent directly into the fuel gas pipeline network, resulting in a low utilization rate. If it is recycled and utilized reasonably, considerable benefits will be generated. However, due to design flaws in the initial stage of the device, it was only able to carry out the hydrogenation of tetraenoic hydrocarbons and could not treat this stream of exhaust gases. To further tap the potential of C4 resources and provide cracking units with more high-quality raw materials, the company is carrying out capacity expansion and renovation on its butadiene off-gas hydrogenation unit based on its current setup. As part of this upgrade, the original full hydrogenation process has been replaced by a single-stage hydrogenation process, with an optional hydrogenation process added. The butadiene off-gas and depentanized C4 stream can be subjected to selective hydrogenation to produce 18,000 tons/year of C4 olefins. This product can serve as raw material for the isononanol plant, thereby increasing the utilization rate of the downstream isononanol production facility and strengthening cooperation with BASF. At the same time, after the renovation, the stripped butene from the isononanol unit can be fully hydrogenated to produce 102,800 tons per year of butane-rich butane hydrocarbons, which serve as high-quality feedstock for ethylene cracking and help increase the yield of ethylene. Through this renovation, the plant’s production capacity will increase from 40,000 tons per year to 100,000 tons per year, generating an annual profit of around 20 million yuan; the economic and social benefits are therefore quite significant.
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