Method for separating propylene from dehydrogenation reaction products of propane-containing feedstock
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C07C-007/13
C07C-007/12
C07C-005/327
C07C-011/06
B01D-053/04
B01D-053/047
C07C-007/04
출원번호
US-0534832
(2015-12-04)
등록번호
US-10221111
(2019-03-05)
우선권정보
KR-10-2014-0178410 (2014-12-11)
국제출원번호
PCT/KR2015/013201
(2015-12-04)
국제공개번호
WO2016/093558
(2016-06-16)
발명자
/ 주소
Kim, Chul Jin
Park, Deuk Soo
Kim, Kyung Min
출원인 / 주소
SK Gas Co., Ltd.
대리인 / 주소
Abelman, Frayne & Schwab
인용정보
피인용 횟수 :
0인용 특허 :
3
초록
An embodiment of this invention provides a method of effectively producing propylene by separating reaction products obtained by dehydrogenating propane-containing feedstock, using an adsorption process in lieu of conventional low-temperature separation processes.
대표청구항▼
1. A method of separating propylene from a dehydrogenation product of a propane-containing feedstock, comprising the steps of: a) providing a propylene-containing product obtained by dehydrogenating the propane-containing feedstock, the propylene-containing product containing 25 to 50 wt % of propyl
1. A method of separating propylene from a dehydrogenation product of a propane-containing feedstock, comprising the steps of: a) providing a propylene-containing product obtained by dehydrogenating the propane-containing feedstock, the propylene-containing product containing 25 to 50 wt % of propylene, 40 to 65 wt % of propane and 1 to 8 wt % of a C4+ hydrocarbon, an amount of isobutylene in the C4+ hydrocarbon being 0.1 to 2 wt % based on an amount of the propylene-containing product;b) transferring the propylene-containing product to a depropanizer so that at least a portion of the C4+ hydrocarbon is separated as a bottom stream and a first refined propylene-containing product is separated as an overhead stream;c) transferring the first refined propylene-containing product to an adsorption separation unit so as to be split into (i) a propane-rich stream and (ii) a propylene-rich stream through selective adsorption-desorption of olefin, wherein the propane-rich stream contains propane, hydrogen, methane, ethane and a desorbing agent;d) separating and recovering propylene from the propylene-rich stream;e) separating the propane-rich stream into a top stream and a bottom stream by using a propane splitter, wherein the top stream comprises the hydrogen, methane, ethane, and propane and the bottom stream comprises the desorbing agent, wherein the propane separated from the propane-rich stream is recycled to the step a), and is thereby dehydrogenated together with the propane-containing feedstock; andf) supplying the desorbing agent separated from the propane-rich stream to the step c). 2. The method of claim 1, wherein an amount of a C4 olefin compound in the C4+ hydrocarbon is 0.5 to 3 wt % based on the amount of the propylene-containing product, an amount of 1,3-butadiene in the C4+ hydrocarbon is 0.01 to 0.2 wt % based on the amount of the propylene-containing product, and an amount of benzene, toluene and xylene (BTX) in the C4+ hydrocarbon is 0.1 to 1 wt % based on the amount of the propylene-containing product. 3. The method of claim 1, further comprising pressurizing the propylene-containing product to 20 to 35 kg/cm2, before the step b). 4. The method of claim 1, further comprising separating a light gas stream containing at least a portion of hydrogen, methane, a C2 hydrocarbon (including ethane and ethylene), carbon monoxide and carbon dioxide from the propylene-containing product, before the step b). 5. The method of claim 1, further comprising transferring the C4+ hydrocarbon separated in the step b) to a debutanizer so as to be split into a C4 hydrocarbon and a C5+ hydrocarbon. 6. The method of claim 5, further comprising separating and recovering benzene, toluene and xylene (BTX) from the C5+ hydrocarbon. 7. The method of claim 1, wherein the first refined propylene-containing product, contains hydrogen and a C3 or smaller hydrocarbon. 8. The method of claim 7, wherein in the first refined propylene-containing product, respective amounts of propylene and propane are 30 to 50 wt % and 40 to 65 wt %, and an amount of isobutylene is 0.3 wt % or less. 9. The method of claim 8, wherein in the first refined propylene-containing product, respective amounts of 1,3-butadiene-containing diolefin and BTX are 500 wppm or less and 100 wppm or less. 10. The method of claim 1, wherein a desorbing agent comprising a paraffin-based hydrocarbon having a larger number of carbon atoms than that of propylene is used in the absorption separation unit. 11. The method of claim 10, wherein the desorbing agent is a C4 hydrocarbon, or a C4 hydrocarbon-rich fraction. 12. The method of claim 1, wherein the depropanizer is operated at a temperature of 50 to 100° C. at a top thereof and a temperature of 120 to 150° C. at a bottom thereof under a pressure of 20 to 40 kg/cm2, and a number of trays thereof is 100 to 170. 13. The method of claim 1, wherein the propane-rich stream from which the desorbing agent is separated is subjected to at least one separation process PSA (pressure swing adsorption) and membrane separation and is thus split into propane, fuel gas (methane and ethane) and hydrogen, and the separated propane is recycled to the step a). 14. The method of claim 1, wherein the propylene-rich stream contains, in addition to propylene, a desorbing agent, and the propylene is separated and recovered from the desorbing agent, and the separated desorbing agent is supplied to the step c). 15. The method of claim 14, wherein the propylene-rich stream contains ethylene, propylene and the desorbing agent, and is fed into an ethylene splitter so that off-gas containing ethylene is separated as an overhead stream and a bottom stream containing propylene and the desorbing agent is separated, and the bottom stream is transferred to a propylene splitter so that an overhead stream comprising propylene and a bottom stream comprising the desorbing agent are separated from each other, and the separated propylene is recovered and the separated desorbing agent is supplied to the step c). 16. The method of claim 1, wherein the first refined propylene-containing product contains MAPD (methylacetylene-propadiene), and MAPD that is not separated by the depropanizer is removed through selective hydrogenation between the steps b) and c), thus forming a second refined propylene-containing product, which is then fed to the adsorption separation unit. 17. A method of separating propylene from a dehydrogenation product of a propane-containing feedstock, comprising the steps of: a) providing a propylene-containing product obtained by dehydrogenating the propane-containing feedstock, the propylene-containing product containing 25 to 50 wt % of propylene, 40 to 65 wt % of propane and 1 to 8 wt % of a C4+ hydrocarbon, an amount of isobutylene in the C4+ hydrocarbon being about 0.1 to 2 wt % based on an amount of the propylene-containing product;b) cooling the propylene-containing product to 25 to 50° C. through heat exchange;c) pressurizing the cooled propylene-containing product to 20 to 35 kg/cm2and performing drying;d) transferring the pressurized and dried propylene-containing product to a depropanizer so that at least a portion of the C4+ hydrocarbon is separated as a bottom stream and a first refined propylene-containing product including hydrogen and a C3 or smaller hydrocarbon is separated as an overhead stream;e) transferring the first refined propylene-containing product to an adsorption separation unit so as to be split into (i) a propane-rich stream containing hydrogen, a C3 or smaller paraffin-based hydrocarbon and a desorbing agent and (ii) a propylene-rich stream containing ethylene, propylene and the desorbing agent through selective adsorption-desorption of olefin; andf) transferring the propane-rich stream to a propane splitter so that the desorbing agent is separated therefrom to give a propane-rich stream having no desorbing agent, supplying the separated desorbing agent to the step c), separating propane from the propane-rich stream having no desorbing agent to give a remaining stream having no propane, recycling the separated propane to the step a), and separating and recovering hydrogen and fuel gas from the remaining stream having no propane; andg) separately from the step f), transferring the propylene-rich stream to an ethylene splitter so as to be split into an overhead stream including ethylene-containing off-gas and a bottom stream including propylene and the desorbing agent, transferring the stream including propylene and the desorbing agent to a propylene splitter to thus be split into propylene and the desorbing agent, recovering the separated propylene, and supplying the separated desorbing agent to the step e).
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이 특허에 인용된 특허 (3)
Bodner Timothy J. (Ft. Wayne IN), Appliance combustion chamber.
Ramachandran Ramakrishnan (Allendale NJ) Dao Loc H. (Bound Brook NJ), Method of producing unsaturated hydrocarbons and separating the same from saturated hydrocarbons.
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