Pretreatment hydrogen cycle purity
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For the reforming pre-hydrogenation unit, what is the typical purity of the recycle hydrogen? What is the hydrogen-to-oil ratio? How is the hydrogen-to-oil ratio calculated?
Data from some manufacturers: Hydrogen-to-oil ratio (v), H2, H2S, NH3, H2O, C1, C2, C3, C4, C5 – percentages (v), ppm, ppm, ppm, percentages (v), percentages (v), percentages (v), percentages (v).
1: 164, 90.3, 500, 2.6; 5.80, 0.8, 0.4, 0.1
2: 123, 90.269; 4.969, 3.067, 1.024, 0.166, 0.504
3: 269, 92.74, 80; 2.91, 2.44, 1.34, 0.39, 0.18
4: 101, 91.92, 400; 484.8, 1.63, 0.55, 1.64, 2.13, 0.75
5: 98; 140, 95; <0.5; 1.71, 1.62, 1.36, 0.38, 0.12
6: 208, 91.7, 100; 4.5, 2.2, 1, 0.6, 0
7: 262, 91.03, 200; 1.9, 0.49, 1.48, 1.54, 1.17
8: 125, 91.08; 2.42, 1.51, 1.73, 1.93, 1.33
9: 116/1, 85.9, 261; 11.13, 2.11, 0.52, 0.11, 0.23
10: 200, 95.6, 330; 3.93, 0.34, 0.06, 0.01, 0
11: 265, 98, 256; 1.73, 0.36, 0.13, 0.05
12: 161, 84; 10.05, 6.24, 2, 0.34, 0.12
13: 121, 92.834; 5.195, 0.852, 0.419, 0.7
14: 253, 80
15: 175, 93.55, 70; 3.13, 0.95, 1.14, 0.92, 0.31
16: 170, 97, 112.3; 2.03, 0.79, 0.18
17: 180, 90.05; 1.46, 2.86, 2.73, 2.34, 0.56
1: 164, 90.3, 500, 2.6; 5.80, 0.8, 0.4, 0.1
2: 123, 90.269; 4.969, 3.067, 1.024, 0.166, 0.504
3: 269, 92.74, 80; 2.91, 2.44, 1.34, 0.39, 0.18
4: 101, 91.92, 400; 484.8, 1.63, 0.55, 1.64, 2.13, 0.75
5: 98; 140, 95; <0.5; 1.71, 1.62, 1.36, 0.38, 0.12
6: 208, 91.7, 100; 4.5, 2.2, 1, 0.6, 0
7: 262, 91.03, 200; 1.9, 0.49, 1.48, 1.54, 1.17
8: 125, 91.08; 2.42, 1.51, 1.73, 1.93, 1.33
9: 116/1, 85.9, 261; 11.13, 2.11, 0.52, 0.11, 0.23
10: 200, 95.6, 330; 3.93, 0.34, 0.06, 0.01, 0
11: 265, 98, 256; 1.73, 0.36, 0.13, 0.05
12: 161, 84; 10.05, 6.24, 2, 0.34, 0.12
13: 121, 92.834; 5.195, 0.852, 0.419, 0.7
14: 253, 80
15: 175, 93.55, 70; 3.13, 0.95, 1.14, 0.92, 0.31
16: 170, 97, 112.3; 2.03, 0.79, 0.18
17: 180, 90.05; 1.46, 2.86, 2.73, 2.34, 0.56
The purity of the hydrogen circulation stream is quite high, exceeding 96%; since the hydrogen in the system comes into contact with liquid substances again with each cycle, the purity of the hydrogen used in the hydrogenation of naphtha and jet fuel is also very high. In the case of a single-pass hydrogen process, the purity of the hydrogen used is generally 2-4 units higher than that of the supplementary hydrogen. The hydrogen-to-oil ratio must be determined based on the type of feedstock being processed; for straight-run naphtha, a ratio of over 60 is generally required, while in the case of more heavily processed oils, a ratio of 150 or higher may even be necessary to remove the heat generated by the reaction. The specific calculations are very simple; read more books
The purity of the hydrogen used in the pre-hydrogenation cycle varies from one plant to another depending on factors such as the properties of the feedstock and the reaction pressure, so it cannot be generalized. The hydrogen-to-oil ratio is determined by the properties of the raw material; for straight-run naphtha, a ratio of over 70 is sufficient, while for refined oils, ratios in the hundreds are also common.