Work Item
ASTM WK68732
New Test Method for Thiophenic and non-Thiophenic Sulfur Impurities in Styrene Monomer by Gas Chromatography and Sulfur Chemiluminescence Detector
1. Scope
This test method covers the determination of typical thiophenic sulfur species found in styrene monomer extracted from pyrolysis gasoline (pygas). This test method also determines non-thiophenic sulfur compounds as a group, calculated using the response from 1-hexanethiol. This test method is applicable to finished styrene monomer from pygas extraction, styrene monomer derived from ethylbenzene, and other upstream styrene concentrate samples from the same processes. The analytical range will vary depending on the instrument used; however, the analytical range tested in this method is 0.3 mg/kg S to 30 mg/kg S per individual sulfur compound.
Keywords
Sulfur; Styrene; Thiophenic sulfur; non-Thiophenic sulfur
Rationale
It has been studied that mercaptans and disulfides in styrene monomer negatively affect the downstream polymerization of Styrene. Adversely, Thiophenic sulfur is not harmful to the styrene polymerization process. Therefore, there needs to be a standard method which determines the two types of sulfur in Styrene monomer (thiophenic and non-thiophenic). Furthermore, Styrene monomer specification (ASTM D2827) may change in the future to reflect non-thiophenic sulfur limitation. Thus, this method can be used for the determination of the non-thiophenic sulfur in Styrene as will be specified in the new ASTM D2827.
The title and scope are in draft form and are under development within this ASTM Committee.
Work Item Status
Date Initiated: 06-18-2019
Technical Contact: Katherine Ulgenes
Item: 000
Ballot:
Status: