Does the hydrogen produced as a by-product in the styrene plant contain sulfur and methane impurities?
Thread Content
Does the hydrogen produced as a by-product in the styrene plant contain sulfur and methane impurities?
Isn’t the hydrogen produced still needs to be purified using PSA?
It is necessary to take samples for analysis; if the product is present in the original system, normal methane will be present, while sulfur levels depend on whether it is present in the raw materials
Yes, but it’s definitely not possible to be 100% certain; industrial hydrogen was purchased, but methane is detected in the analysis, while sulfur is present occasionally
What was purchased was industrial hydrogen produced as a by-product of the styrene process; analyses showed the presence of methane, while sulfur was present occasionally, at levels of a few tenths of ppm, so I want to confirm this
The catalysts used for the hydrocarbylation of ethylene to produce ethylbenzene, as well as those used for the dehydrogenation of ethylbenzene to produce styrene, are resistant to sulfur; therefore, it mainly depends on whether the raw materials, ethylene and benzene, contain sulfur. If the raw material ethylene is polymeric-grade ethylene and the source of raw material benzene is the aromatic extraction unit downstream of catalytic reforming, then the by-product hydrogen is essentially sulfur-free (< 0.5 ppmv) ； If the feed ethylene is sulfur-containing by-product dry gas such as from FCC, and the feed benzene comes from sulfur-containing coker benzene, then the by-product hydrogen will contain a small amount of sulfur.
It occurs intermittently; to ensure it, quality control measures need to be introduced. Quality system, quality control procedures, failure modes, SPC. Supplier audits are conducted in accordance with the quality standards of the semiconductor materials industry; generally, domestic companies ignore such audits