Friday, August 22, 2008

Patent on Liquid Phase Hydrogenation of Alkynes

The press release contains the text: "No one else in the world comes close to the elegance of our design and the efficiency of its operation. We could not be more pleased that we have received this patent which both recognizes and protects our unique design."

The patent in question US 7,408,091, is based on a continuation of the already-existing U.S. Pat. No. 7,045,670. Claim 1 recites:

A process for selective hydrogenation, comprising: preparing a reactant stream comprising an alkyne absorbed in a liquid absorbent; contacting the reactant stream with a selective hydrogenation catalyst in the presence of a gas stream comprising hydrogen and greater than 2000 ppm carbon monoxide, at hydrogenation conditions to provide a product stream; wherein the catalyst comprises a Group VIII metal; separating the absorbent from the product stream to recover a product.

The chemistry in question occurs in a relatively expensive "non-hydrocarbon" liquid:

The non-hydrocarbon liquid absorbent may comprise, without limitation: n-methyl-2-pyrrolidone (NMP), acetone, tetrahydrofuran (THF), dimethylsulfoxide (DMSO), monomethylamine (MMA), and/or combinations thereof, and is preferably NMP. The hydrogenation may preferably be effected by passing the absorbed acetylene and/or acetylenic compounds into the inlet of a fixed bed reactor, or a series of reactors, containing the catalyst, while co-currently passing a stream of gas containing at least hydrogen into the reactor at an inlet location.

The source of acetylene and/or acetylenic compounds and/or hydrogen and/or carbon monoxide may preferably be pyrolysis, thermal cracking, steam cracking, partial oxidation, or other like process, wherein hydrocarbons or hydrocarbon-containing streams are thermally and/or chemically modified to produce increased quantities of unsaturated components, and the acetylene and/or acetylenic compounds may comprise, but are not limited to: acetylene, allene, vinyl acetylene, methyl acetylene, ethyl acetylene, 1-butyne, 2-butyne, and 1,3-butadiyne.



Post a Comment

<< Home