Lenzing (Nanjing) Fibers Co., Ltd. Implements Topsoe WSA Technology for Environmental Protection of Viscose Staple Fibre Production in China
03 January 2006
Lenzing (Nanjing) Fibers Co., Ltd. Implements Topsoe WSA Technology for Environmental Protection of Viscose Staple Fibre Production in China
Lenzing (Nanjing) Fibers Co., Ltd., a joint venture between Nanjing Chemical Fibre Co., Ltd. (Nanjing, People's Republic of China) and Lenzing AG (Austria), has decided to use Topsoe's WSA technology for environmental protection and production of sulphuric acid for their grass root viscose staple fibre factory located just outside Nanjing in China's Jiangsu Province. The WSA plant will eliminate hydrogen sulphide and carbon disulphide contained in the off-gases by converting these sulphur compounds into sulphuric acid. The off-gas volume treated is 80,000 Nm³/h, and 300 ton/day of acid can be produced.
Sulphuric acid is a material used in the production of viscose fibres, so in addition to the environmental effect, the recovery of sulphuric acid will entail considerable savings. The WSA plant is very energy efficient, and excess heat of reaction from the process is recovered in the form of high pressure superheated steam. The steam will be de-superheated and used for process applications in the fibre production, thus reducing fuel consumption for the main boiler to the benefit of both the economy and the environment.
The WSA process is a versatile and energy efficient process for converting sulphur compounds in off-gases into sulphuric acid. More than 50 WSA plants have been implemented or are under construction worldwide by Topsoe, and four of these are for the viscose fibre industry. Lenzing (Nanjing) Fibers Co. Ltd.'s plant is the 5th WSA plant in the People's Republic of China.
For further information please visit www.topsoe.com or contact Mr. Jens Laursen at jkrl@topsoe.dk.
