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Due to their toxicity, aromatic and olefinic species are often undesirable
in a range of materials produced from solvents units, such as those used
in dry cleaning, adhesives, paints, printing inks and barbecue lighting
fluids. The simplest way to produce aromatic-free solvents is by hydrogenating
the aromatic and olefin species. Our range of HTC catalysts
is the right choice for de-aromatisation and desulphurisation of these
streams. Depending on feedstock, operation conditions and desired end
product specification, our experienced technical specialists will advise
you on the most appropriate HTC type - or a combination
thereof. For more than 20 years, many customers have successfully used HTC in solvents, fuels, white oils, waxes and other
similar applications.
The catalysts are characterised by a highly dispersed active metal phase
and an open pore structure. High metal dispersion is equivalent to small
crystallite size and provides a high metal surface area per gram of metal.
Catalyst activity is directly linked to metal surface area. Large pores
are important to make the metal surface area accessible and minimise diffusion.
The above mentioned features result in high activity, high selectivity
and poison resistance, which is nowadays required to turn difficult feeds
into low-aromatic and low-sulphur products. The high physical strength
and low attrition index ensures a trouble-free operation even at longer
lifetimes - and easy unloading at end of run.
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HTC Plant, Emmerich, Germany |
HTC catalysts have been used to produce a wide range
of solvents from a variety of hydrocarbon feedstocks including gasoline,
kerosene and diesel type fractions. The catalysts commonly reduce aromatic
contents from several wt% to less than 50ppm, with tighter specifications achievable
as required. These catalysts have also been proven in the manufacture
of high quality medicinal white oils, highlighting the unique characteristics
of this catalyst range.
Similarly olefinic solvents can be produced with bromine indices below
10 mg Br2/100g. Again we have experience of a wide range of feedstocks,
both light materials such as hexane or heavier species such as PAO (poly-alpha
olefins).
In response to market demands for higher activity and improved sulphur tolerance Johnson Matthey has expanded it HTC range with HTC NI 700 RP 1.2 and HTC NI 900 RP 1.2. The newest products complement the portfolio with a high activity long life solution.
In some special applications, precious metal on alumina catalysts provide
the highest performance. Please, contact us to discuss your requirements. |
