Process for converting hydrocarbons into olefins

Patent metadata

Field	Value
Publication number	US-2017009151-A1
Application number	US-201415120681-A
Country	US
Kind code	A1
Filing date	Dec 23, 2014
Priority date	Feb 25, 2014
Publication date	Jan 12, 2017
Grant date	—

Abstract

The present invention relates to a process for converting a hydrocarbon feedstock into olefins and preferably also into BTX, said converting process comprising the following steps of: feeding a hydrocarbon feed-stock to a first hydrocracking unit, feeding the effluent from said first hydrocracking unit to a first separation section, separating said effluent in said first separation section feeding at least one stream to a dehydrogenation unit, and feeding the effluent from said at least one dehydrogenation unit to a second separation section.

First claim

1 . A process for converting a hydrocarbon feedstock into olefins and BTX, said converting process comprising the following steps of:
feeding a hydrocarbon feedstock to a first hydrocracking unit; feeding effluent from said first hydrocracking unit to a first separation section; separating said effluent in said first separation section into one or more streams from the group including a stream comprising hydrogen, a stream comprising methane, a stream comprising ethane, a stream comprising propane, a stream comprising butanes, a stream comprising C1-minus, a stream comprising C2-minus, a stream comprising C3-minus, a stream comprising C4-minus, a stream comprising C1-C2, a stream comprising C1-C3, a stream comprising C1-C4, a stream comprising C2-C3, a stream comprising C2-C4, a stream comprising C3-C4 and a stream comprising C5+; feeding at least one stream chosen from the group including said stream comprising propane, said stream comprising butanes, said a stream comprising C3-minus, said stream comprising C4-minus, said stream comprising C2-C3, said stream comprising C1-C3, said stream comprising C1-C4, said stream comprising C2-C3, said stream comprising C2-C4 and said stream comprising C3-C4 to at least one dehydrogenation unit chosen from the group including a butanes dehydrogenation unit, a propane dehydrogenation unit, a combined propane-butanes dehydrogenation unit, or a combination of units thereof: feeding from said first separation section at least one stream from the group including said stream comprising ethane, said stream comprising C1-C2 and said stream comprising C2-minus to a steam cracking unit and/or a second separation section; and feeding the effluent(s) from said steam cracking unit and at least one dehydrogenation unit to said second separation section.

2 . The process according to claim 1 , wherein said dehydrogenating process is a catalytic process and said steam cracking process is a thermal cracking process.

3 . The process according to claim 1 , further comprising feeding said stream comprising C5+ to a second hydrocracking unit.

4 . The process according to claim 1 , further comprising feeding a stream comprising C1-minus to said second separation section.

5 . The process according to claim 3 , further comprising separating the effluent from said second hydrocracking unit into a stream comprising C4-minus, a stream comprising unconverted C5+, and a stream comprising BTX;
further comprising feeding said stream comprising C4-minus to said first separation section; and further comprising combining said stream comprising unconverted C5+ with said hydrocarbon feedstock and feeding the combined stream thus obtained to said first hydrocracking unit.

6 . The process according to claim 3 , further comprising pretreating said hydrocarbon feedstock by separating said hydrocarbon feedstock into a stream having a high aromatics content and a stream having a low aromatics content, and feeding said stream having a low aromatics content into said first hydrocracking unit; and
further comprising feeding said stream having a high aromatics content to said second hydrocracking unit.

7 . The process according to claim 1 , further comprising feeding said stream comprising butanes to said butanes dehydrogenation unit and feeding a stream chosen from the group including said stream comprising C2-C3, said stream comprising C1-C3, said stream comprising C3 minus, and said stream comprising C3 to said propane dehydrogenation unit.

8 . The process according to claim 1 , further comprising feeding a stream from the group including said stream comprising C3-C4, said stream comprising C2-C4, said stream comprising C1-C4, and said stream comprising C4 minus to said combined butanes and propane dehydrogenation unit.

9 . The process according to claim 1 , further comprising feeding the effluent from said steam cracking unit to said second separation unit.

10 . The process according to claim 1 , further comprising separating any effluent from said steam cracking unit, said first separation section and said at least one propane or butanes or combined propane-butanes dehydrogenation unit in said second separation section into one or more streams chosen form the group including a stream comprising hydrogen, a stream comprising methane, a stream comprising C3, a stream comprising C2=, a stream comprising C3−, a stream comprising C4 mix, a stream comprising C5+, a stream comprising C2, and a stream comprising C1-minus.

11 . The process according to claim 10 , further comprising feeding said stream comprising C2 to said steam cracker unit.

12 . The process according to claim 10 , further comprising feeding said stream comprising C5+ originating from said second separation section to said first hydrocracking unit and/or said second hydrocracking unit.

13 . The process according to claim 10 , further comprising feeding said stream comprising hydrogen originating from said second separation section to said first hydrocracking unit and/or said second hydrocracking unit.

14 . The process according to claim 10 , further comprising feeding said stream comprising C1-minus originating from said second separation section to said first separation section.

15 . The process according to claim 10 , further comprising feeding said stream comprising C3 originating from said second separation section to said propane dehydrogenation unit and/or said combined propane-butanes dehydrogenation unit.

Assignees

• Dittrich Christoph
• Van Willigenburg Joris
• Schaerlaeckens Egidius Jacoba Maria
• Ward Andrew Mark
• Oprins Arno Johannes Maria
• Rajagopalan Vijayanand
• Narayanaswamy Ravichander
• Saudi Basic Ind Corp
• Sabic Global Technologies Bv
• Raúl VELASCO PELAEZ

Inventors

• Dittrich Christoph
• Van Willigenburg Joris
• Velasco Pelaez Raul
• Schaerlaeckens Egidius Jacoba Maria
• Ward Andrew Mark
• Oprins Arno Johannes Maria
• Rajagopalan Vijayanand
• Narayanaswamy Ravichander

Classifications

• C10G2400/20

  C2-C4 olefins · CPC title

• C10G2400/30

  Aromatics · CPC title

• C10G67/00 Primary

  Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one process for refining in the absence of hydrogen only · CPC title

• C10G69/06

  including at least one step of thermal cracking in the absence of hydrogen · CPC title

• C10G2300/4087

  Catalytic distillation · CPC title