ELECTRONIC CARBONIC ACID GAS ANALYZER

Brand Owner Address Description
APBA HORIBA, LTD. 2, Miyanohigashi-cho Kisshoin, Minami-ku Kyoto-shi, Kyoto 601-8510 Japan electronic carbonic acid gas analyzer;
 

Where the owner name is not linked, that owner no longer owns the brand

    
Technical Examples
  1. A method of making polycarbonate comprises melt-polymerizing an aromatic dihydroxy compound and a carbonic acid diester in a presence of a polymerization catalyst in a reactor system producing a byproduct stream, wherein the polymerization catalyst comprises a quaternary phosphonium compound; and purifying the byproduct stream to separate the carbonic acid diester, wherein the separated carbonic acid diester has a phosphorous concentration of less than or equal to about 30 parts per million.