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Tianjin University's energy chemistry engineering team recently developed a high-efficiency propane dehydrogenation (PDH) platinum-based catalyst, which will significantly improve the efficiency of propylene production, is expected to break the Long-term monopoly of the core technology of propane dehydrogenation in Western countries.
2017, China's propylene production capacity reached 34.22 million tons/year, with a production capacity of 28.37 million tons, an increase of 13.6% over the previous year, but still unable to meet the market demand for propylene consumption. At present, the propane dehydrogenation process is the fastest growing and most promising new acrylic production technology, and platinum-based catalysts are the key to this
in
. Related technology by the United States, Germany and a few other countries long-term monopoly, China's existing 12 sets of propane dehydrogenation propylene production lines are imported from abroad at high prices, catalysts are also completely dependent on imports. In recent years, platinum-based catalysts have been widely used in propane dehydrogenation production propylene process, the principle is based on platinum and other metals to acrylic "catalytic dehydrogenation selectivity" to achieve the production of propylene purposes. The "high-efficiency platinum-based catalyst" developed by Tianjin University has two advantages: First, it is "purer" and removes the metal impurities of the additive through high temperature reduction and pick-up, so that the catalyst forms a pure platinum-covered nuclear shell surface; Second, "stronger", by changing the electronic state of platinum on the surface, improve the catalysis of platinum atoms, thus creating conditions for industrial devices to improve the yield of propylene.
At present, there are four main propane dehydrogenation processes, industrial production of propylene mainly comes from 5 ways: pneumochemic oil vapor cracking by-product propylene, refinery catalytic cracking device by-product propylene, propane dehydrogenated propylene (PDH), coal (methanol) propylene (MTP), ethylene and butene as raw materials of olefin as a result of olefin asdiation. At present, the steam cracking by-product propylene and catalytic cracking by-product propylene as the mainstream, but the lightness of ethylene raw materials (such as ethane cracking) indirectly affected the supply of propylene, promoting the rapid development of PDH process and MTP process. If the use of pyro-oil steam cracking, the general ratio of ethylene and propylene in 3:1 to 2:1, each ton of ethylene production will produce 0.5 tons of propylene; However, with ethane ethylene, for every ton of ethylene produced, only 0.025 tons of propylene is produced by side. Propane dehydrogenation production of propylene industrial catalyst is mainly platinum and chromium catalysts, how to reduce costs, reduce pollution to the environment, improve catalyst stability and selectivity, inhibit the coke reaction, is a problem that researchers need to study and solve.
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