Process for the purification of 1,3-butadiene from an oxidative dehydrogenation process

Patent metadata

Field	Value
Publication number	US-9266795-B2
Application number	US-201313852534-A
Country	US
Kind code	B2
Filing date	Mar 28, 2013
Priority date	Mar 28, 2013
Publication date	Feb 23, 2016
Grant date	Feb 23, 2016

Abstract

A process is presented for the purification of 1,3 butadiene. The process is for treating a butadiene stream from an oxidative dehydrogenation unit, where a butane stream is dehydrogenated, generating a butadiene rich stream. The butadiene rich stream is fractionated and passed through a butadiene recovery unit. Additional C4 compounds recovered from the fractionation bottoms stream are further processed for increasing yields of butadiene.

First claim

The invention claimed is:

1. A process for the purification of 1,3-butadiene, comprising:
passing a butadiene stream to a butene-2 column, thereby generating an overhead stream comprising butadiene, a side draw stream comprising n-butane and 2-butene, and a bottoms stream comprising vinyl acetylene, oxygenates, and heavier hydrocarbons;
passing the overhead stream to a butadiene extraction unit, thereby generating a purified 1,3-butadiene product stream;
passing the side draw stream to a dimerization unit to generate a process stream comprising octene and a raffinate stream;
passing the raffinate stream to a dehydrogenation unit to generate a dehydrogenation process stream comprising butadiene;
passing a portion of the bottoms stream to a selective hydrogenation process to generate a selective hydrogenation process stream comprising n-butane, 2-butene, and butadiene;
passing the dehydrogenation process stream and the hydrogenation process stream to the butene-2 column.

2. The process of claim 1 wherein the butadiene extraction unit comprises:
passing the overhead stream to an extractive distillation column to generate an overhead stream comprising 1-butene, and a bottoms stream comprising butadiene and an extractive solvent; and
passing the bottoms stream to a solvent recovery distillation column to generate an overhead stream comprising purified butadiene and a bottoms stream comprising the extraction solvent.

3. The process of claim 1 further comprising passing the bottoms stream to a second column to generate a second overhead stream comprising n-butane and 2-butene, and a second bottoms stream comprising vinyl acetylene.

4. The process of claim 1 wherein the butene-2 column includes passing the butene-2 bottoms to a second column, and wherein the second column generates a second column overhead stream comprising n-butane and 2-butene, with bottoms stream comprising heavies.

5. The process of claim 2 wherein the extraction solvent is selected from the group consisting of N-methylpyrrolidone (NMP), dimethylformamide (DMF), dimethyl acetamide, and acetonitrile.

6. The process of claim 1 further comprising passing the side draw stream to a wash to generate a washed stream comprising n-butane and 2-butene.

7. The process of claim 1 further comprising passing the octene process stream to a reformer to generate a process stream comprising p-xylene.

8. The process of claim 1 further comprising passing the selective hydrogenation process stream to a C4 column to generate an overhead stream comprising the 2-butenes, and a bottoms stream comprising heavier hydrocarbons and oxygenates.

9. The process of claim 8 further comprising passing the C4 overhead stream to the butene-2 column.

10. The process of claim 1 further comprising the injection of an anti-oxidant, or an anti-polymerant into the feedstream to the butene-2 column.

11. The process of claim 1 further comprising:
passing the overhead stream to a wash prior to passing the overhead stream to the butadiene extraction unit, thereby generating a washed butadiene stream, wherein the wash comprises contacting the butadiene overhead stream with a sodium bisulfite solution;
passing the washed butadiene stream to the butadiene extraction unit, thereby generated a purified butadiene product stream.

12. A process for the production of 1,3-butadiene, comprising:
passing a butene stream to an oxidative dehydrogenation unit to generate an oxidative dehydrogenation process stream comprising butadiene;
passing the butadiene to a butadiene separation unit to generate a first stream comprising butadiene, a second stream comprising n-butane and 2-butene, and a third stream comprising vinyl acetylene, oxygenates and C5/C6 hydrocarbons;
passing the first stream to a wash to generate a washed first stream;
passing the washed first stream to a butadiene extraction unit to generate a purified butadiene stream;
passing the second stream to a dehydrogenation unit to generate a fourth stream comprising butadiene;
passing the fourth stream to the butadiene separation unit;
passing the third stream to a selective hydrogenation unit to generate a selective hydrogenation process stream comprising butenes;
passing the selective hydrogenation process stream to a second separation unit to generate a fifth stream comprising n-butenes, and a sixth stream comprising oxygenates and C5+ hydrocarbons; and
passing the fifth stream to the butadiene separation unit.

13. The process of claim 12 wherein the butadiene extraction unit comprises an extractive distillation system.

14. The process of claim 12 further comprising passing the second stream to a dimerization unit to generate a dimerization process stream comprising octenes.

15. The process of claim 14 further comprising passing the octenes to a reforming unit to generate a process stream comprising p-xylenes.

Assignees

• Uop Llc

Inventors

• Krupa Steven L

Classifications

• C07C7/08

  by extractive distillation · CPC title

• C07C11/167

  1, 3-Butadiene · CPC title

• C07C7/005 Primary

  Processes comprising at least two steps in series · CPC title