Process and apparatus for producing olefin
AssigneeAsahi Kasei Chemicals Corporation
InventorsMitsuhiro Sekiguchi, Takashi Tsunoda
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Abstract
The present invention provides a process for producing olefin having 3 or more carbon atoms from ethane stably in a simpler process. The present invention provides a method for producing olefin having a step of obtaining a cold fraction by cooling an ethane-cracked gas, which is obtained by thermal cracking of ethane in the presence of steam, to 600° C. or less; and a step of obtaining a catalytic cracking gas containing olefin having 3 or more carbon atoms by bringing the cold fraction into contact with a catalyst containing a medium pore diameter zeolite.
Claims17
A process for producing propylene comprising the steps of:
- thermally cracking ethane in the presence of steam to obtain an effluent comprising ethylene;
- cooling the effluent comprising ethylene to a temperature of 600° C. or less to obtain a cold fraction;
- catalytically cracking the cold fraction in the presence of a catalyst comprising a zeolite to obtain a product gas comprising propylene, wherein an ethylene conversion rate in the catalytic cracking of the cold fraction is within a range of 45% to 85% by mass;
- and
- separating and recovering said propylene,
- wherein [1] the zeolite comprises ZSM-5 zeolite,
- [2] silica to alumina ratio of the zeolite is within a range of 20 to 500, and
- [3] temperature programmed desorption (TPD) acid amount of the zeolite is within a range of 20 to 500 μmol/g-zeolite.
A process for producing propylene comprising the steps of:
- thermally cracking ethane in the presence of steam to obtain an effluent comprising ethylene;
- cooling the effluent comprising ethylene to a temperature of 600° C. or less to obtain a cold fraction;
- separating said cold fraction into a liquid-state heavy fraction and a cold gas fraction;
- and
- catalytically cracking the cold gas fraction in the presence of a catalyst comprising a zeolite to obtain a product gas comprising propylene, wherein an ethylene conversion rate in the catalytic cracking of the cold gas fraction is within a range of 45% to 85% by mass,
- wherein [1] the zeolite comprises ZSM-5 zeolite,
- [2] silica to alumina ratio of the zeolite is within a range of 20 to 500, and
- [3] temperature programmed desorption (TPD) acid amount of the zeolite is within a range of 20 to 500 μmol/g-zeolite.
Dependencies are inferred from the claim text.