Feedstock purification is a key unit in any plant that employs steam reforming technology. Not installing or adequately monitoring the correct catalysts and absorbents can have costly consequences to the downstream catalysts that are poisoned by trace impurities in the hydrocarbon feed. Sulphur is a common problem. The nature and level of sulphur species is dependent on the source, pre-treatment and molecular weight of the hydrocarbon feed. Chlorine compounds are less frequently observed, and metal compounds are found in some heavier LPG and naphtha feeds.
The feedstock purification section is typically two to four stages depending on the site requirements. In the hydrodesulphurization (HDS) stage, the organic sulfur compounds are converted to hydrogen sulfide with a similar reaction for organic chloride compounds. If needed, an absorbent is next installed to remove the hydrogen chloride. The third stage is removal of the hydrogen sulfide using zinc oxide (ZnO) absorbents. Finally, in certain plants, an ultrapurification stage is used to reduce impurities to extremely low levels.
Johnson Matthey offers our KATALCO range of purification catalysts and absorbents that allows us to deliver optimized systems to meet individual plant purification requirements. In addition, through our range of PURASPEC catalysts and absorbents, we can provide mercury removal down to ppb levels, low temperature H2S removal absorbents, and ultrapurification down to ppb levels of sulphur to protect even the most sensitive of downstream catalysts, including pre-reforming and low temperature shift catalysts.
|KATALCO 61-1T||KATALCO 32-5|
|3-in-1 sulphur removal:||Mercury removal:|
|KATALCO 33-1||PURASPEC 1156|
Bulletins for all of our KATALCO products are available through our KATALCO customer login area.