Catalytic conversion process and system with increased propylene production
AssigneesChina Petroleum & Chemical Corporation, Research Institute of Petroleum Processing, Sinopec
InventorsYouhao XU, Xuhui BAI, Langyou WEN, Xin WANG, Mingyuan HE
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Abstract
A catalytic conversion process for producing propylene includes the steps of: 1) providing a starting material comprising olefin(s) having 4 or more carbon atoms; 2) pretreating the starting material to obtain a propylene precursor comprising olefin(s) having 3×2n carbon atoms, wherein n is an integer greater than or equal to 1; and 3) subjecting the propylene precursor to a catalytic cracking reaction to obtain a reaction product comprising propylene.
Claims17
A process for producing propylene, comprising the steps of:
- 1) providing a starting material comprising olefin(s) having 4 or more carbon atoms;
- 2) pretreating the starting material to obtain a propylene precursor comprising olefin(s) having 3×2n carbon atoms, wherein n is an integer greater than or equal to 1, preferably 1-3, more preferably 1-2;
- and
- 3) subjecting the propylene precursor to a catalytic cracking reaction to obtain a reaction product comprising propylene,
- wherein the pretreating of step 2) comprises one or both of:
- 2a) separating the starting material to obtain a first propylene precursor comprising olefin(s) having 3×2n carbon atoms, and/or one or more of the following fractions:
- a fraction comprising C4 olefin, a fraction comprising C5 olefin, a fraction comprising C7 olefin, and a fraction comprising C8 olefin;
- and
- 2b) subjecting the starting material or a fraction thereof to an olefin oligomerization reaction, and optionally separating the resulting oligomerization product, to obtain a second propylene precursor comprising olefin(s) having 3×2m carbon atoms, wherein m is an integer greater than or equal to 2, preferably 2 to 3.
A system for producing propylene, comprising a pretreatment unit configured to pretreat a starting material comprising olefin(s) having 4 or more carbon atoms to obtain a propylene precursor comprising olefin(s) having 3×2n carbon atoms, wherein n is an integer greater than or equal to 1, preferably 1 to 3, more preferably 1 to 2, and a reaction unit configured to catalytically crack the propylene precursor to obtain a reaction product comprising propylene,
- wherein the pretreatment unit comprises at least one of a first separation unit configured to separate the starting material to obtain a first propylene precursor comprising olefin(s) having 3×2n carbon atoms, and/or one or more of the following fractions:
- a fraction comprising C4 olefin, a fraction comprising C5 olefin, a fraction comprising C7 olefin, and a fraction comprising C8 olefin;
- and an oligomerization unit configured to carry out an olefin oligomerization reaction on the starting material or a fraction thereof, and optionally separate the resulting oligomerization product, to obtain a second propylene precursor comprising olefin(s) having 3×2m carbon atoms, wherein m is an integer greater than or equal to 2, preferably 2 to 3.
Dependencies are inferred from the claim text.