Processes and apparatuses for separating chlorides from n-butane
Processes and apparatuses for separating chlorides from a butane product stream by removing chlorides from a portion of said feed stream in a rectification section of the separation zone. The rectification section may be in a rectification column which may be combined with a stripper column. Alternatively, a wall may be used to provide the rectification section in a fractionation column. The processes and apparatuses can be used in both new designs and revamped designs.
1. A process for separating chlorides from a butane product stream, the process comprising:
separating, in a separation zone, a feed stream comprising light hydrocarbons, propane, isobutane, n-butane, chlorides, and C5+ hydrocarbons into a stream comprising light hydrocarbons, propane, isobutane, and n-butane and a liquid stream comprising an alkylate effluent with C5+ hydrocarbons; and,
removing chlorides from a liquid or vapor portion of said feed stream in a rectification section of the separation zone, the rectification section providing a butane product stream.
2. The process of claim 1 , wherein the separation zone comprises a fractionation column, and wherein the rectification section comprises a rectification column.
3. The process of claim 2 , wherein a bottoms stream from the rectification column is passed back to the fractionation column.
4. The process of claim 3 , wherein a side draw stream from the rectification column comprises the butane product stream.
5. The process of claim 3 , wherein an overhead stream from the rectification column is condensed to provide the butane product stream.
6. The process of claim 1 , wherein the separation zone comprises a fractionation column, and further comprises a stripping section.
7. The process of claim 6 , wherein the stripping section and the rectification section are in the fractionation column.
8. The process of claim 6 , wherein the separation zone comprises a second column and both the stripping section and the rectification section are in the second column.
9. The process of claim 6 , wherein the separation zone further comprises a first column comprising the rectification section and a second column comprising the stripping section.
10. The process of claim 9 , wherein a bottoms stream from the second column is passed to the first column.
11. The process of claim 9 , wherein the first column and the second column produce a common overhead stream.
12. The process of claim 9 , wherein the first column and the second column are disposed on top of each other.
13. The process of claim 6 , wherein the separation zone comprises a second column and wherein the second column comprises the stripping section and the fractionation column comprises the rectification section.
14. A process for separating chlorides from a butane product stream, the process comprising:
separating, in a separation zone comprising a deisobutanizer column, a feed stream comprising light hydrocarbons, propane, isobutane, n-butane, chlorides, and C5+ hydrocarbons into a stream comprising light hydrocarbons, propane, isobutane, and n-butane and a liquid stream comprising an alkylate effluent with C5+ hydrocarbons; and,
passing a side draw stream from the deisobutanizer column to a rectification column, the side draw stream comprising liquid or vapor;
passing a bottoms stream from the rectification column to the deisobutanizer column, the bottoms stream comprising organic chlorides;
passing a vapor or liquid stream from the rectification column to the deisobutanizer column or another lower pressure vessel, the vapor or liquid stream comprising HCl, iso-butane, and n-butane;
recovering a butane product stream from the deisobutanizer column; and,
passing the butane product stream to an adsorbent zone having an adsorbent configured to remove chlorides and provide a chloride lean butane product stream.
15. The process of claim 14 , wherein the butane product stream from the deisobutanizer column is a side draw stream.
16. The process of claim 14 , further comprising:
cooling an overhead stream from the rectification column to provide the vapor or liquid stream and the butane product stream.
17. A process for separating chlorides from an n-butane stream, the process comprising:
separating, in a separation zone comprising a separation column a feed stream comprising light hydrocarbons, propane, isobutane, n-butane, chlorides, and C5+ hydrocarbons into a stream comprising light hydrocarbons, propane, isobutane, and n-butane, and a liquid stream comprising an alkylate effluent with C5+ hydrocarbons; and,
removing organic chlorides from the feed stream in a rectification section; and,
removing HCl from the feed stream in a stripper section.
18. The process of claim 17 , wherein the separation zone comprises a first column comprising the rectification section and a second column comprising the stripper section.
19. The process of claim 17 , wherein the rectification section is disposed within the separation column.
20. The process of claim 17 , wherein the separation zone comprises a second column and both the stripper section and the rectification section are in the second column.