Process for the oxidative coupling of hydrocarbons
A method for the oxidative coupling of hydrocarbons, such as the oxidative coupling of methane to toluene, includes providing an oxidative catalyst inside a reactor, and carrying out the oxidative coupling reaction under a set of reaction conditions. The oxidative catalyst includes (A) at least one element selected from the group consisting of the Lanthanoid group, Mg, Ca, and the elements of Group 4 of the periodic table (Ti, Zr, and Hf); (B) at least one element selected from the group consisting of the Group 1 elements of Li, Na, K, Rb, Cs, and the elements of Group 3 (including La and Ac) and Groups 5-15 of the periodic table; (C) at least one element selected from the group consisting of the Group 1 elements of Li, Na, K, Rb, Cs, and the elements Ca, Sr, and Ba; and (D) oxygen.
1. A method for the oxidative coupling of methane and toluene comprising:
providing a hydrocarbon feedstream comprising methane and toluene;
providing an oxidative catalyst within a reactor, the catalyst consisting essentially of
(A) Mg element from 40 to 90 wt. % of the catalyst;
(B) at least one element selected from the group consisting of Cs and Re, wherein the elements from (B) comprise from 0.01 to 40 wt. % of the catalyst;
(C) at least one element selected from the group consisting of Na, Sr, and Ca, wherein the elements from (C) comprise from 0.01 to 40 wt. % of the catalyst; and
(D) oxygen, wherein oxygen comprises from 10 to 45 wt. % of the catalyst;
feeding the hydrocarbon feedstream and an oxygen source to the reactor;
carrying out oxidative coupling of methane to toluene over the oxidative catalyst according to an oxidative coupling condition; and
recovering product hydrocarbons comprising ethyl benzene and styrene from the reactor.
2. The method of claim 1 , wherein the oxidative coupling of methane to toluene occurs in the reactor with a molar ratio of methane to oxygen of from 1:1 to 100:1.
3. The method of claim 1 , wherein the oxidative coupling of methane to toluene occurs in the reactor with a molar ratio of methane to toluene ranging from 1:1 to 50:1.
4. The method of claim 1 , wherein the catalyst is pretreated before it is used for the oxidative coupling of hydrocarbons, the pretreatment comprising heating the catalyst to above 750° C.
5. The method of claim 1 , wherein the composition of the product hydrocarbons can be adjusted by adjusting the temperature of the reaction.
6. The method of claim 1 , wherein the composition of the product hydrocarbons can be adjusted by adjusting the space velocity of the reaction.