I D
× COMMENTARYEDITOR'S PAGECOVER STORYIN THE NEWSNEWSFRONTSCHEMENTATOR + Show More
Chemical Engineering MagazineChementator Briefs
Nanofiltration Toray Industries, Inc. (Tokyo, Japan; www.toray.com) has created what…
BUSINESS NEWSTECHNICAL & PRACTICALFEATURE REPORTFACTS AT YOUR FINGERTIPSTECHNOLOGY PROFILEEQUIPMENT & SERVICESFOCUSNEW PRODUCTS + Show More SHOW PREVIEWS

Comment

New oxocatalyst demonstrated for vinyl chloride monomer production

By Tetsuo Satoh |

Recently, Tosoh Corp. (Tokyo, Japan; www.tosoh.com) has applied a new, proprietary oxocatalyst in the oxychlorination process for making ethylene dichloride (EDC) from ethylene, HCl, and O2 in its vinyl chloride monomer (VCM) manufacturing process. The performance boost anticipated from simulation studies of the new catalyst has been confirmed at some of the company’s VCM plants, which have a production capacity of 500,000 metric tons per year (m.t./yr).

Tosoh first began operating a VCM plant in the 1960s using a proprietary oxychlorination process. Since then, the company has worked to improve the oxycatalysts. Ethylene oxychlorination over a CuCl2-KCl/Al2O3 catalyst in a commercial scale plant was examined for two consecutive years, during which the performance of the catalyst gradually deteriorated. The spent catalyst exhibited signs of deterioration, such as an increase in the K-to-Cu ratio induced by CuCl sublimation. In order to clarify how such changes in the catalyst component affect deactivation, kinetic studies and XANES ((x-ray absorption near-edge structure) analysis were carried out, and showed that an increased oxidation number of Cu elevated the activation energy of the oxychlorination catalyst. This change in activation energy would be one of the factors in the deactivation of the CuCl2-KCl/Al2O3 catalyst at the scale of a commercial plant. Such changes in the activation energy could help predict the catalyst life in the plant.

Tosoh’s latest proprietary oxycatalyst is said to represent significant progress in performance. In spite of its simple copper-catalyst composition, it features a cylindrical shape and a unique pore structure in the support, enabling high-performance capabilities, such as high activity, selectivity for EDC and durability.

Tosoh is expecting to aggressively strengthen its competitiveness by converting to the new oxycatalyst at its other VCM manufacturing facilities over the next few years.

Related Content

Chemical Engineering publishes FREE eletters that bring our original content to our readers in an easily accessible email format about once a week.
Subscribe Now
How separation processes profit from Industrial Internet of Things (IIoT) solutions
Up to 80% increased production rates in plastic recycling
Higher throughput and purity in sodium bicarbonate production with up to 15% less energy consumption
Help feeding nations with chemical filtering technologies
Not at the forefront of Industry 4.0?

View More

Live chat by BoldChat