Process for preparation of lower aliphatic hydrocarbons
AssigneeResearch Association for Utilization of Light Oil
InventorsKazunori Takahata, Toshihiro Murashige, Yukimasa Shigemura, Hiroshi Takaki, Akihiko Okano
Life of this patent
Estimating the term…
Abstract
A paraffin having 5 to 10 carbon atoms is catalytically cracked in the presence of a catalytically cracking catalyst having a strong acidity, especially a rare earth metal ion-exchanged mordenite or a dealuminized mordenite, to form a paraffin having 3 or 4 carbon atoms. The formed paraffin is contacted with a dehydrogenation catalyst to obtain an olefin having 3 or 4 carbon atoms.
Claims15
A process for the preparation of a lower aliphatic hydrocarbon comprising at least 30% by weight of an olefin having 3 to 4 carbon atoms from a first paraffin having 5 to 10 carbon atoms or a first hydrocarbon comprising at least 30% by weight of said first paraffin, which comprises:
- carrying out a first reaction of catalytically cracking said first paraffin having 5 to 10 carbon atoms or said first hydrocarbon comprising at least 30% by weight of said first paraffin in the presence of a catalytic cracking catalyst having a strong acidity selected from the group consisting of
- a mordenite catalyst dealuminized by an acid treatment to produce a silica/alumina molar ratio of from 12 to 70, and a solid super-strong acid catalyst formed by supporting a sulfuric acid ion on a carrier composed of Zr(OH).sub.4, ZrO.sub.2, H.sub.4 TiO.sub.4, TiO.sub.2 or Fe.sub.2 O.sub.3,
- to convert said first paraffin or said first hydrocarbon to a second hydrocarbon comprising at least 30% by weight of a second paraffin having 3 to 3 carbon atoms;
- and
- carrying out a second reaction of dehydrogenating said second hydrocarbon comprising at least 30% by weight of said second paraffin having 3 to 4 carbon atoms obtained in said first reaction with a dehydrogenation catalyst to convert said second hydrocarbon to a lower aliphatic hydrocarbon comprising at least 30% by weight of an olefin having 3 to 4 carbon atoms.
A process for the preparation of a lower aliphatic hydrocarbon, which comprises catalytically cracking a paraffin having 5 to 10 carbon atoms or a hydrocarbon comprising at least 30% by weight of said paraffin to form a lower aliphatic hydrocarbon comprising at least 30% by weight of a paraffin having 3 to 4 carbon atoms in the presence of a mordenite catalyst dealuminized by an acid treatment to produce a silica/alumina molar ratio of from 12 to 70.
A process for the preparation of a lower aliphatic hydrocarbon comprising at least 30% by weight of a paraffin having 3 to 4 carbon atoms which comprises:
- bringing a paraffin having 5 to 10 carbon atoms or a hydrocarbon comprising at least 30% by weight of said paraffin into contact with a catalyst composed of a mordenite, dealuminized by an acid treatment to produce a silica/alumina molar ratio of from 12 to 70, at a temperature of 300.degree. to 550.degree. C. in a fluidized bed to form a cracking reaction product comprising at least 30% by weight of a paraffin having 3 or 4 carbon atoms;
- withdrawing a part of the catalyst together with the cracking product from the fluidized bed;
- separating the cracking catalyst from the cracking reaction product;
- regenerating the separated catalyst by a burning treatment at a temperature of 400.degree. to 800.degree. C.;
- and
- circulating the regenerated catalyst to the fluidized bed.
A process for the preparation of a lower alphatic hydrocarbon, which comprises catalytically cracking a paraffin having 5to 10 carbon atoms or a hydrocarbon comprising at least 30% by weight of said paraffin to form a lower aliphatic hydrocarbon comprising at least 30% by weight of a paraffin having 3 to 4 carbon atoms in the presence of a solid super-strong acid catalyst which is formed by supporting a sulfuric acid ion on a carrier compounds of Zr(OH).sub.4, ZrO.sub.2, H.sub.4 TiO.sub.4, TiO.sub.2 or Fe.sub.2 O.sub.3.
Dependencies are inferred from the claim text.