申请人:BP OIL INTERNATIONAL LIMITED
公开号:EP2022772A1
公开(公告)日:2009-02-11
The present invention relates to a process for converting methane into a liquid mixture of (C3+) alkanes having 3 carbon atoms and more, preferably (C4+) alkanes having 4 carbon atoms and more, especially (C5+) alkanes having 5 carbon atoms and more. It comprises a stage (1) comprising converting methane into acetylene, performed by submitting methane to a thermal cracking reaction, so as to form a reaction mixture (M1) comprising acetylene and hydrogen, a stage (2) comprising converting acetylene into ethane, performed by contacting the acetylene or the reaction mixture (M1) previously obtained with hydrogen in the presence of a hydrogenation catalyst (C1), so as to form a reaction mixture (M2) comprising ethane, a stage (3) comprising simultaneous ethane self- and cross-metathesis reactions performed by contacting the ethane or the reaction mixture (M2) previously obtained with a metal catalyst (C2) capable of producing, in contact with alkane, reactions involving the splitting and recombining of C-C and/or C-H and/or C-metal bonds, so as to form a reaction mixture (M3) comprising methane and a mixture of the (C3+), preferably the (C4+), especially the (C5+) alkanes, and a stage (4) comprising fractionating the reaction mixture (M3) so as to separate and to isolate said mixture in liquid form. Preferably, the methane is also separated in stage (4) and recycled into stage (1) for methane conversion into acetylene
本发明涉及一种将甲烷转化为液态混合物的过程,该混合物包含有3个或更多碳原子的(C3+)烷烃,优选是含有4个或更多碳原子的(C4+)烷烃,特别是含有5个或更多碳原子的(C5+)烷烃。该过程包括以下阶段:阶段(1)包括将甲烷转化为乙炔,通过将甲烷提交给热裂解反应来实现,从而形成包含乙炔和氢的反应混合物(M1);阶段(2)包括将乙炔转化为乙烷,通过在氢气存在下将乙炔或先前获得的反应混合物(M1)与氢气接触,并在氢化催化剂(C1)的存在下进行,从而形成包含乙烷的反应混合物(M2);阶段(3)包括通过将乙烷或先前获得的反应混合物(M2)与能够在与烷烃接触时产生涉及C-C和/或C-H和/或C-金属键的裂解和重组反应的金属催化剂(C2)接触,同时进行乙烷自身和交叉甲醚反应,从而形成包含甲烷和(C3+)烷烃混合物的反应混合物(M3),优选是(C4+),特别是(C5+)烷烃;阶段(4)包括对反应混合物(M3)进行分馏,以便将所述混合物分离并以液态形式分离。优选地,甲烷也在阶段(4)中分离并回收到阶段(1)用于将甲烷转化为乙炔。