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US 11,649,406 B2Granted
Method and system for separating light hydrocarbons
AssigneesChina Petroleum & Chemical Corporation, Beijing Research Institute of Chemical Industry, China Petroleum & Chemical Corporation
InventorsShujuan Luo, Dongfeng Li, Mingsen Zhang, Lihua Liao, Yan Li, Zhixin Liu, Chunfang Li, Jun Tian
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Abstract
A method and system for separating light hydrocarbons are disclosed, wherein the method comprises compression, cooling, absorption, desorption, rectification, cracking, and recycling cracked gas to the compression step.
Claims36
A method for separating light hydrocarbons, comprising the following steps:
- (1) compressing and cooling C1-C4 hydrocarbon-containing hydrocarbon material to be separated to produce compressed and cooled hydrocarbon material, wherein the C1-C4 hydrocarbon-containing hydrocarbon material contains at least one olefin selected from C2-C4 olefins and at least one alkane selected from C1-C4 alkanes;
- (2) contacting the compressed and cooled hydrocarbon material with an absorbent to absorb hydrocarbons with two or more carbon atoms to produce a solvent-rich material;
- (3) rectifying the solvent-rich material to produce a gas-phase material containing olefins and saturated alkanes and a solvent-lean material;
- (4) rectifying the gas-phase material containing olefins and saturated alkanes one or more times to produce one or more streams of a saturated-alkane-rich liquid-phase material;
- (5) cracking the one or more streams of the saturated-alkane-rich liquid-phase material to produce a cracked gas;
- and
- (6) circulating the cracked gas to the step (1);
- wherein the step (4) comprises:
- feeding the gas-phase material containing olefins and saturated alkanes into a second rectifying tower for rectification, obtaining a first stream containing ethane and ethylene from the top part of the second rectifying tower and a second stream containing hydrocarbons with three or more carbon atoms from the bottom;
- feeding the first stream into a third rectifying tower for rectification, obtaining an ethylene product stream on the side part, a third stream containing ethylene from the top part of the third rectifying tower, and an ethane-rich fourth stream from the bottom.
7 more elements
A system for separating light hydrocarbons, comprising:
- a compressing and cooling unit, an absorption unit, a desorption unit, a rectifying unit, and a cracking unit, wherein the absorption unit is connected to the compressing and cooling unit and the desorption unit, respectively, the rectifying unit is connected to the desorption unit and the cracking unit, respectively, and the cracking unit is connected to the compressing and cooling unit;
- wherein the compressing and cooling unit comprises a compressor and a heat exchanger, the absorption unit comprises a first absorption tower, the desorption unit comprises a first rectifying tower, the rectifying unit comprises a second rectifying tower and a third rectifying tower, and the cracking unit comprises a cracking furnace.
Dependencies are inferred from the claim text.