Processes for removing carbon disulfide from sulfide product streams
AssigneeChevron Phillips Chemical Company LP
InventorsJeremy Lee, Brian G. Gerlach, Dale M. Solaas, Kenneth M. Lassen, Ugochukwu Nwagwu, Jonathan A. Powell, Daniel M. Hasenberg
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Abstract
Processes for removing carbon disulfide from product streams containing a sulfide compound are performed by contacting the product stream with an aqueous solution comprising a mercaptide to form a mixture, or by contacting the product stream with an aqueous solution comprising a mercaptan and a base to form a mixture. An aqueous layer is removed from the mixture, resulting in a high purity sulfide stream with significantly less carbon disulfide.
Claims23
A process to purify a product stream containing at least 80 wt. % of a sulfide compound and CS2, the process comprising:
- (i) contacting the product stream with an aqueous solution comprising a mercaptan and a base to form a mixture;
- and
- (ii) removing at least a portion of an aqueous layer from the mixture to form a purified sulfide stream;
- wherein the sulfide compound has formula (I):
- R
- 1
- -
- S
- -
- R
- 2
- ;
- (
- I
- )
- R1 and R2 independently are selected from the group consisting of a C1 to C18 substituted or unsubstituted, cycloalkyl group and linear or branched alkyl group;
- and wherein the base is selected from the group consisting of sodium hydroxide, potassium hydroxide, calcium hydroxide, ammonium hydroxide, and any combination thereof.
A process to purify a product stream containing at least 80 wt. % of a sulfide compound and CS2, the process comprising:
- (i) contacting the product stream with an aqueous solution comprising a mercaptan and a base to form a mixture;
- and
- (ii) removing at least a portion of an aqueous layer from the mixture to form a purified sulfide stream;
- wherein the sulfide compound is selected from the group consisting of methyl ethyl sulfide, methyl iso-propyl sulfide, methyl dodecyl sulfide, ethyl octyl sulfide, n-pentyl n-heptyl sulfide, dimethyl sulfide, diethyl sulfide, di-n-propyl sulfide, di-iso-propyl sulfide, di-n-butyl sulfide, di-n-pentyl sulfide, di-n-hexyl sulfide, di-n-heptyl sulfide, di-n-octyl sulfide, di-n-dodecyl sulfide, and any combination thereof;
- and
- wherein the base is selected from the group consisting of sodium hydroxide, potassium hydroxide, calcium hydroxide, ammonium hydroxide, and any combination thereof.
Dependencies are inferred from the claim text.