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Houston, TX, United States

Amano T.,Shin - Etsu Chemical Co. | Koyanagi S.,Shin - Etsu Chemical Co. | Okuno Y.,Shintech Inc. and 3 Greenway Plaza | Kanagawa C.,Shintech Inc. and 3 Greenway Plaza
Kagaku Kogaku Ronbunshu | Year: 2010

A stripping column for residual vinyl chloride monomer (VCM) in poly (vinyl chloride) (PVC) slurry was developed in order to meet the most important environmental needs in PVC manufacturing. A stripping column consisting of a steam/PVC slurry counterflow system with sieve trays was chosen to achieve VCM environmental regulation, higher PVC productivity, and preservation of PVC quality (especially initial color of PVC) after VCM stripping. The stable running conditions and VCM stripping ability were evaluated for this column. Based on these results, the VCM stripping column was scaled up, and a high efficiency VCM stripping system with a stripping capacity of 35 t/h (as PVC) was designed. Copyright © 2010 The Society of Chemical Engineers, Japan. Source


Okuno Y.,Shintech Inc. and 3 Greenway Plaza | Kanagawa C.,Shintech Inc. and 3 Greenway Plaza | Koyanagi S.,Shin - Etsu Chemical Co. | Ohura M.,Shintech Inc. and 3 Greenway Plaza | Amano T.,Shin - Etsu Chemical Co.
Kagaku Kogaku Ronbunshu | Year: 2010

PVC polymerization technology was developed to reduce polymerization time without deforming the PVC characters (especially color appearance), by which the total batch cycle time was remarkably reduced. Perester and diacyl derivative initiators were concluded to be effective, and the polymerization time was reduced from 4 h to 3 h by use of these initiators and reactor cooling technologies. Simultaneously, the control of polymerization state and the conditions for emergency stop of polymerization by use of inhibitors were investigated for the sake of safety in short-time (high speed) polymerization, and a monitoring system was established for safer PVC polymerization. Applying these technologies to present commercial plants is expected to result in greatly increased productivity and reduced cost. Copyright © 2010 The Society of Chemical Engineers, Japan. Source

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