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DPC monomer As part of an NEDO project, Asahi Kasei Corp. (Tokyo, Japan; www.asahi-kasei.co.jp) verified a newly developed process for diphenyl carbonate (DPC), a monomer used to produce polycarbonate (PC) at its Mizushima Works (Kurashiki, Okayama). The stability and operability of the process was confirmed through over 1,000 h of continuous operation. Compared to the conventional process, the new process successfully reduces energy consumption and CO2 emissions while using CO2 as a feedstock.  This new route to DPC (Chem. Eng., April 2015, p. 10; www.chemengonline.com/scaleup-alternative-route-pc-monomer) uses only an alcohol, phenol and CO2 as feedstocks, and therefore increases the flexibility of the company’s phosgene-free PC process (Chem. Eng., December 2005, p. 16; www.chemengonline.com/articles.php?file=2005%2FNewsChem%2FNewsChem12012005_19.html), which uses ethylene oxide (EO) as feedstock.
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