Method for reducing hydrogen chloride emissions from an asphalt air-blowing process

US6036843A · kind A · utility

Assignee

• Owens-Corning Fiberglas Technology, Inc. · US

Inventors

• Jorge A. Marzari · Bolingbrook, US
• Katherine Elizabeth Poterek · Arlington Heights, US
• David C. Trumbore · Bourbonnais, US
• Michael R. Franzen · Bocholt, DE
• Herman P. Benecke · Columbus, US
• Timothy Thomas Picman · Bridgeview, US

Key dates

• Filing date: Dec 30, 1998
• Grant date: Mar 14, 2000
• Expiry date: Dec 30, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10C3/04
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

In a method for reducing hydrogen chloride emissions from an asphalt blowing process, ferric chloride and/or ferrous chloride are added to the asphalt. A chemical modifier is also added to the asphalt. The asphalt is subjected to a blowing process which produces hydrogen chloride emissions. The addition of the chemical modifier reduces the hydrogen chloride emissions by at least 25% compared to the same process without the addition of the chemical modifier. The addition of the ferric chloride and/or ferrous chloride provides beneficial effects such as increased blowing rate and increased final penetration of the asphalt. Preferably, the addition of the chemical modifier does not significantly reduce these beneficial effects.