Mineral oils: processes and products – Chemical conversion of hydrocarbons – With subsequent treatment of products
Patent
1989-12-28
1990-12-25
Davis, Curtis R.
Mineral oils: processes and products
Chemical conversion of hydrocarbons
With subsequent treatment of products
208100, 208213, 208310Z, C10G 6706
Patent
active
049800469
ABSTRACT:
A hydrotreating process uses a separation section that reduces the loss of C.sub.5 and higher hydrocarbons through the use of a low hydrogen to hydrocarbon ratio in the reactor and the adsorptive removal of a majority of hydrogen sulfide from a liquid phase hydrotreater effluent. Sulfurous hydrocarbon feed is admixed with hydrogen to maintain a hydrogen to hydrocarbon ratio of less than 50 SCFB. The hydrogen and hydrocarbons are passed through a hydrotreater reactor to convert sulfur compounds to H.sub.2 S. The hydrotreater effluent is cooled and after flashing of any excess hydrogen or light ends the cooled effluent is contacted with an adsorbent material for the removal of H.sub.2 S. A hydrotreated hydrocarbon product is withdrawn from the adsorption section. The low hydrogen to hydrocarbon ratio permits the process to be used without the recycle of hydrogen thereby eliminating the need for separators and compressors that were formerly used to recycle hydrogen to the hydrotreater. The elimination of the recycle and the low hydrogen to hydrocarbon ratio simplifies the flowscheme which can use a simple separator to flash light ends, hydrogen and some H.sub.2 S from the hydrotreater effluent. This process thus eliminates the need for a stripping section that was formerly needed to remove light ends and hydrogen sulfide from the hydrotreated product. The adsorptive removal of the H.sub.2 S and the limited venting of hydrogen allows essentially all of the hydrotreated product to be preserved. In most flowschemes H.sub.2 S removal can be carried out in the absorbers that are usually present for drying of the hydrotreated feed.
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Haizmann Robert S.
Symoniak Martin F.
Zarchy Andrew S.
Davis Curtis R.
Diemler William C.
McBride Thomas K.
Tolomei John G.
UOP
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