Process to prepare paraffins and waxes
A process and hydrocarbon technology, applied in the field of preparing paraffins and waxes, can solve problems such as high selectivity, and achieve the effect of reducing product distribution differences
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[0125] In the present example, two Fischer-Tropsch reactors are connected in series. The cobalt-based Fischer-Tropsch catalyst was loaded in two reactors and reduced. The upstream reactor (named R1) is supplied with syngas, and the downstream reactor (named R2) receives the waste gas from the upstream reactor.
[0126] The exhaust gas contains unreacted hydrogen and carbon monoxide. In each instance, one reactor was just started and the other reactor was degraded in activity. In the basic case, both reactors are operated at the same production rate, but at different operating temperatures. Table 1 lists the amount of gas, solvent, LDF, HDF, SX-30, SX-50, SX-70, SX-100 / 105.
[0127] In Table 1, the first three rows provide reaction conditions. Y (yes) or N (no) is used to indicate the addition of ammonia. Based on the Fischer-Tropsch product stream, the product gas, solvent, LDF, HDF, SX-30, SX-50, SX-70, SX-100 / 105 are expressed in weight %.
[0128] In the first example accord...
example 2
[0135] Example 2 clearly shows a decrease in gas, solvent, LDF, but an increase in SX-100 / 105. The amount of HDF, SX-30, SX-50, Sx-70 remains unchanged. These observations indicate that increasing the temperature of the two reactors leads to an increase in the C41+ selectivity of the Fischer-Tropsch catalyst.
example 3
[0136] Example 3 clearly shows an increase in gas, solvent, LDF, HDF, SX-30, SX-50, SX-70, but a decrease in SX-100 / 105.
[0137] These observations indicate that adding ammonia to the synthesis gas stream and increasing the temperature in one reactor, while reducing the temperature in the other reactor, results in a decrease in the C41+ selectivity of the Fischer-Tropsch catalyst.
[0138] Therefore, these examples clearly show that by considering the state of the catalyst present in each reactor in the Fischer-Tropsch reactor system, the content of the product stream can be well controlled. The "groups" and the periodic table mentioned herein refer to the new IUPAC version of the periodic table, such as those described in the 87th edition of the Handbook of Chemistry and Physics (CRC Press).
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