SulfrZol 54® Catalyst Sulfiding Agent

Sulfiding is a key operation in catalyst activation, but it doesn’t have to be as unpleasant, potentially dangerous, difficult, or as environmentally unfriendly as you’ve probably experienced. SulfrZol® 54 is a premium alternative to traditional sulfiding agents. With a higher flash point, low odor, and emissions-improving technology, it offers safer, cleaner, and effective catalyst activation that is preferred by refinery managers, operators, and the surrounding community.

Physical Properties Comparison
SulfrZol 54 vs. DMDs
Property DMDs SulfrZol 54
Sulfer Content, % wt/wt 68 54
Decomposition Temperature
(in contact with catalyst)
200 ºC (392 ºF) 160 ºC (320 ºF)
Flash Point (closed cup) 16 ºC (61 ºF) 100 ºC (212 ºF)
Viscosity, cps at 20 ºC 0.62 14
Pour/Freeze Point -85 ºC (-121 ºF) -48 ºC (-54 ºF)
Odor Description
(provided by vendor)
Decaying Cabbage
Low Odor:
Similar to Gas Oil

Unpleasant odors causing you headaches?
There’s a better way to sulfide your catalyst.

DMDS has an extremely unpleasant odor—primarily due to residual mercaptans from the production process—and spills can be a nuisance to refinery workers and the surrounding community. On the other hand, SulfrZol 54 has a mild diesel-like smell. Employees and neighbors prefer the smell of SulfrZol 54 as it is not unpleasant and is virtually undetectable in an open-air environment.

Potential fire hazards concerning you?
There’s a better way to sulfide your catalyst

DMDS has a low flash point of 61 °F (16 °C) that presents fire hazards during refinery usage. Due to its strong odor and low flash point, DMDS typically requires storage under nitrogen pressure in closed containers. SulfrZol 54, with a much higher flash point of 212 °F (100 °C), greatly reduces the risk of potential flash fires and eliminates the expense and concern of extravagant storage requirements. In fact, because the risk level of SulfrZol 54 is so low, refinery operators often inject SulfrZol 54 with portable, low-pressure pumps.

In addition, SulfrZol 54 may reduce on-site demurrage charges if there are delays in sulfiding at the refinery. Contrary to DMDS, because of it’s high flash point, SulfrZol 54 is D.O.T. classified as non-hazardous for transportation, so drivers may leave trucks until the sulfiding is complete.

Unnecessary SOx emissions keeping you up at night?

There’s a better way to sulfide your catalyst
The hydrocarbon byproduct of DMDS is methane, which accumulates in the hydrogen plus H2S recycle gas. This leads to dilution of hydrogen in the recycle gas, sometimes requiring purge to the flare and addition of more makeup hydrogen to maintain the required
hydrogen partial pressure. The purge gas going to the flare contains H2S, which produces undesired SOx emissions.

However, the SulfrZol 54 hydrocarbon byproduct is isobutane, which normally exits the high-pressure separator with the liquid hydrocarbons, not diluting the hydrogen in the recycle gas. Therefore, Sulfrzol 54 may reduce SOx emissions from decreased or eliminated flaring of recycle gas.

Contact us at with all your SulfrZol questions or needs.