Yantai University has made significant progress in butene enrichment technology, which is now being adopted by domestic companies and even exported internationally. The university's breakthrough technology, which has secured five national invention patents, offers a more efficient and cost-effective alternative to imported methods. Compared to existing solutions, it features a simpler process, lower energy consumption, higher product purity, and improved yield, while also reducing solvent usage and the need for frequent regeneration. Its operational flexibility makes it highly attractive in the market.
Currently, nine companies across China have successfully implemented the technology, showcasing its practical value. In addition to butene enrichment, Yantai University has achieved several other milestones, including the purification of butylene-containing exhaust gases, the development of a specialized defoamer for butene upgrading, and the industrial production of N-formylmorpholine, a key solvent used in the process.
The butene enrichment technology involves extractive distillation to separate high-purity n-butene from carbon tetrachloride liquid gas, followed by hydration and dehydrogenation to produce methyl ethyl ketone (MEK), an essential chemical raw material with strong market potential. As petroleum processing techniques evolve, the separation of n-butene from by-products of steam cracking and catalytic cracking has become increasingly important.
Since 1992, the Butene Extraction Group at Yantai University has conducted extensive research and engineering development to enhance the purity and recovery rate of n-butene while reducing energy consumption. Their self-developed technology has been scaled up directly from the lab without intermediate testing, achieving industrial application and earning multiple patent protections.
In 2002, Xinjiang Tianli Hi-Tech Co., Ltd. became the first company to apply this technology in building a 30,000-ton/year MEK plant. Since then, the technology has spread across numerous domestic enterprises, including Jiangsu Lingguang, CNPC Harbin Petrochemical, and Lanzhou Petrochemical, whose equipment has received industry recognition as one of the most advanced and efficient production systems available.
To further support the industrialization of the technology, Yantai University collaborated with the Lanzhou Petrochemical Research Institute to develop butene hydration tail gas purification and a special defoamer, both of which were transferred to Taizhou Donglian Chemical Co., Ltd. Additionally, with support from the Shandong Provincial Science and Technology Commission, Yantai Hongteda Chemical Co., Ltd. built a 500-ton/year N-formylmorpholine production facility, now operating in full-scale industrial production.
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