DEQ-CFW_00087881

i2004 Air Emissions Inventory Supporting Documentation
Emission Source ID No.: BS-Insig B8.1
Emission Source Description: Butacite Extrusion Process - Line 3
Process and Emission Description:
The Butacite Line 3 Extrusion Process is a continuous process in which polyvinyl butyral
(PVB) resin is extruded into a plastic sheet using three separate mechanical extruders. To
remove the resin's entrained water, a vacuum is pulled on the extruders using a series of steam
venturi jets. Following each steam jet, the exhaust stream passes through water-cooled
condensers to remove the water vapor so that the following steam jet can achieve the
necessary secondary vacuum to achieve the required overall vacuum at the extruder so as to
produce saleable product.
Air emissions from the Butacite Line 3 Extrusion Process are assumed to be completely
(100%) captured. The emissions of Volatile Organic Compounds (VOC) are assumed to be
totally the 3GO plasticizer used to manufacture Butacite PVB sheeting. Because the potential
VOC emissions are well less than the 40 ton per year NSR/PSD significant emission rate, the
final condenser, which exists to remove water and other condensable compounds from the
atmospheric discharge, can be treated as having a control efficiency of 0%.
Basis and Assumptions:
The assumption is that all VOC emissions from the Line 3 extrusion process are comprised of
the 3GO plasticizer.
Information Inputs and Source of Inputs:
Information Inputs
Source of Inputs
Butacite Line 3 Extrusion Process total
throughput pounds for the year
Butacite Production Support (BPS) System
annual report.
Point Source Emissions Determination:
Determination of point source VOC emissions are given in the following pages.
Equipment Emissions and Fugitive Emissions Determination:
• Since the Butacite extruders operate under a vacuum, there are no non -point source (fugitive)
emissions nor equipment emissions associated with this process.
DEQ-CFW 00087881