Method for the manufacture of hydrocarbons
A diesel, selective technology used in the field of hydrocarbon production, which can solve the problems of low yield and complexity of decarboxylation reaction
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Embodiment 1
[0062] Decarboxylation of stearic acid
[0063] A series of experiments were performed in a Parr autoclave equipped with a heating mantle, stirrer, baffles and sparging device. 1 gram of the catalyst given in Table 1 below was placed in the autoclave and pretreated at a temperature of 200° C. under a stream of hydrogen. After pretreatment, 85 grams of dodecane (solvent) and 4.5 grams of stearic acid were fed into the reactor. The reaction temperature was maintained at 300°C while passing helium through the reactor. The reactor pressure of 0.8MPa keeps the reactants and products in the liquid phase, except CO 2 Otherwise, it is removed from the reactor with helium as carrier gas. The conversion of stearic acid and the selectivity of heptadecane (in brackets) to the C17-product and the desired product after 90 minutes of reaction relative to the catalyst used in the reaction are also given in Table 1 listed. As can be seen from Table 1, particularly preferred catalysts are ...
Embodiment 2
[0067] Decarboxylation of Stearic Acid in the Presence of Bimetallic Catalysts
[0068] In a procedure similar to that given in Example 1, a bimetallic catalyst, Pd (8 wt %) Pt (2 wt %) / C was used. After 90 minutes of reaction, 40 mol % of stearic acid had been converted with a selectivity to n-heptadecane formation of 83 mol %.
Embodiment 3
[0070] Decarboxylation of stearic acid in the presence of different gases
[0071] In the reaction apparatus described in Example 1, a set of three experiments was carried out. In all cases, 1 gram of catalyst (Pd(5wt%) / C) was added to the reactor, which was then reduced at 200°C under hydrogen flow. 45 grams of stearic acid and 40 grams of dodecane were then fed into the reactor. During the reaction at 300° C., a reactor pressure of 1.9 MPa was maintained in each experiment by helium, a gas mixture of hydrogen (5 vol%) and argon (95 vol %), and hydrogen, respectively. The conversion of stearic acid and the selectivity to n-heptadecane are listed in Table 2 below. As can be seen from Table 2, the mixture of hydrogen (5 vol %) and inert gas produced a high selectivity for n-heptadecane (93 mol %).
[0072] Table 2
[0073] gas Response time, min Conversion rate,% C17-selectivity, mol% helium 300 41 96(83) hydrogen 360 49 95(94) Hydrogen ...
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