Stable, moderately unsaturated distillate fuel blend stocks prepared by low pressure hydroprocessing of fischer-tropsch products
A distillate fuel, unsaturated technology, applied in the preparation of liquid hydrocarbon mixture, fuel, liquid carbon-containing fuel, etc., can solve the problem of expensive hydrogen
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[0120] The accompanying drawing shows a process for preparing the highly paraffinic, moderately unsaturated distillate fuel blend stock of the present invention. refer to figure 1 , the raw material (10) obtained by the low-temperature Fischer-Tropsch process is subjected to hydrogenation operation in a hydrogenation operation unit (100) supplied with hydrogen gas (20). Hydrogenation operating conditions include temperature 600-750 , pressure less than 1000 psig and liquid hourly space velocity greater than 0.25 hours -1 . The product (30) of the hydroprocessing is a highly paraffinic, moderately unsaturated distillate fuel blend stock containing 2-20% by weight of unsaturated Saturates, and peroxide precursors in an amount such that less than 5 ppm peroxide is formed after storage at 60°C for 4 weeks. Hydroprocessing produces hydrogen (60), which can be used in other processes such as hydrotreating, CO 2 Reduction and fuel production. Optionally, the highly paraffinic,...
Embodiment 1
[0124] Light low-temperature Fischer-Tropsch waxes (Table I) over a sulfurized nickel-tungsten / silica-alumina catalyst (a conventional hydroprocessing catalyst) at LHSV for 1 h -1 , 1000 psig, 685°F and 6.3 MSCF / bbl under hydrocracking. Under these conditions, the conversion below 650°F was 80.4% by weight. The liquid product is fractionated at about 350F and about 675F to obtain a diesel blend stock fraction. The yields and properties of the diesel blend stocks are listed in Table II.
[0125] Table I
[0126] Specific gravity, API
[0127] Table II
[0128] <650 conversion rate, wt%
[0129] The lower limit of detection of PNA by supercritical fluid chromatography (SFC) is 0.5% by weight. Therefore, the undetected values are less than this amount. Operating under these conditions produced only 0.3% aromatics and retained 0.8 wt% olefins due to high pressure conventional operation. The...
Embodiment 2
[0131] The same feed as in Example 1 was hydrocracked over a sulfurized 3 / 1 multi-layered bed of the same catalyst as in Example 1 over a Pt / SAPO-11 catalyst with 15% by weight Aluminum oxide bonded. Pt / SAPO-11 catalyst is a complete hydroisomerization dewaxing catalyst. The conditions were the same as in Example 3, which was total LHSV 1.0 hours -1 , 1000psig, 685 and 6.3MSCF / bbl H 2 . The conversion below 650°F was 74.6% by weight. The product is fractionated at about 350F and about 650F to obtain a diesel blendstock fraction. The yields and properties of the diesel blend stocks are listed in Table III. Diesel blend stocks are stable as measured by ASTM D6468. Due to conventional high pressure operation and Pt as the catalytic metal, aromatics were 0.1 wt% and olefins were 0.3 wt% in the diesel blend stock. The alkane content was 99.6, as determined by GC-MS to be devoid of naphthenes and supported by ndM analysis. The cetane index is very high (73.8) and the cloud ...
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