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1. Direct Oxidation Method Lyondell Corporation, USA, is developing a new technology that directly oxidizes propylene to PO. The company calls it a "one-step direct method." This method can shorten the process, but also reduce costs and reduce by-products. Currently, Lyondell has established a direct oxidation of propylene to a PO intermediate plant at the Technical Center in Pennsylvania, USA, which will be completed in the fourth quarter of this year and will be put into operation and testing in 2004. In the experiment, the final step in the process is to be improved. The company is optimistic that this technology will eventually be commercialized, and the company plans to realize its commercialization by 2010.
2.POSM method and cumene method Lyondell is not only developing direct oxidation method, but also POSM (ie propylene oxide-styrene monomer, abbreviation of propylene oxide-styrene monomer, referring to the production of ethylbenzene and propylene as raw materials. Propylene oxide and styrene are leading technologies. The company believes that it is still the lowest cost technology other than direct oxidation; it intends to start production of a new POT-produced PO in Rotterdam, the Netherlands, by the end of this year.
In addition, Lyondell also participated in a joint venture of Nihon Oxirane, a subsidiary of Japan’s Sumitomo Corporation; Sumitomo suggested that a 200,000-tonne/year cumene process PO be built in Chiba, Japan; Lyondell is also involved in the development of this technology; The technology is characterized by high yields and fewer by-products.
3.HPPO Act Many companies are currently investing in HPPO (ie, the acronym for hydrogen peroxide to hydrogen peroxide). Among them, Digossa, Wood, and BASF are all contributing to the improvement and improvement of HPPO technology. .
Diggersa and Wood recently stated that Sasol, a South African petrochemical producer, has considered adopting its technology to establish a 60,000-ton/year PO plant and Sasol will use it to produce propylene glycol ether. Its basic design has now begun and construction began in 2004, making it a reference device for large-scale installations.
Earlier this year, Dow Chemical and BASF announced that they had cooperated in the study of the HPPO law in 2002 and signed a joint development agreement earlier this year. Major progress has been made so far and pilot projects will be completed by the end of this year. Then, the design of a 300,000-ton/year PO plant will be carried out and the plant will be put into operation in 2007. One of the factors affecting the HPPO technology is the large amount of hydrogen peroxide required. According to De Gosa, approximately 0.7 tons of hydrogen peroxide per ton of PO is required.
Lyondell believes that there are other unknown factors, only the direct oxidation method is the technology that will make PO production step change in the future. As for other technological improvements, it can only improve its competitiveness when compared with the POSM method.
Continuously developing propylene oxide production technology
Many manufacturers of propylene oxide (PO) are developing a new generation of production technology to reduce costs and reduce by-products, and to strengthen and improve existing production technologies. The overview is as follows: