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US 4,396,787 AGranted
Process for the thermal dimerization of butadiene
AssigneeDeutsche Texaco Aktiengesellschaft
InventorsKarl-Heinz Gluzek, Olaf Petersen, Wilhelm Neier, Gunter Strehlke, Karl-Heinz Heinemann
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Abstract
Formation of undesirable popcorn polymer on the walls of a reaction vessel during thermal dimerization of butadiene is prevented by coating the walls with a falling film of aqueous sodium nitrite solution.
Claims9
The process for thermal dimerization of butadiene in an upstanding reaction vessel which comprises;
- passing an aqueous alkali metal nitrite solution to the head of said upstanding reaction vessel;
- passing a film of said solution from the head downwardly over the internal surfaces of said upstanding reaction vessel;
- withdrawing said solution from a lower portion of said upstanding reaction vessel;
- passing to said upstanding reaction vessel a charge gas stream containing butadiene;
- maintaining a temperature of about 180.degree. C.-260.degree. C. and a pressure of about 50-250 bar in said upstanding reaction vessel whereby said butadiene is thermally dimerized to form product stream containing vinyl cyclohexene;
- and
- recovering said product stream containing vinyl cyclohexene.
4 more elements
The process for thermal dimerization of butadiene in an upstanding tubular reactor which comprises:
- passing a 4 w%-9 w% aqueous sodium nitrite solution to the head of said upstanding tubular reaction vessel;
- passing a film of said solution downwardly over the internal surface of the tubes of said upstanding tubular reaction vessel;
- withdrawing said solution from a lower portion of said upstanding reaction vessel;
- passing to a lower portion of said upstanding tubular reactor a charge gas stream containing butadiene;
- passing said charge gas stream upwardly countercurrently with respect to said downwardly descending aqueous sodium nitrite solution;
- maintaining a temperature of about 180.degree. C.-260.degree. C. and a pressure of about 50-250 bar in said upstanding tubular reaction vessel, whereby said butadiene is thermally dimerized to form product stream containing vinyl cyclohexene;
- and
- recovering said product stream containing vinyl cyclohexene from the overhead of said upstanding tubular reaction vessel.
5 more elements
Dependencies are inferred from the claim text.