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US 2015/0353371 A1Published application
Processes for producing hydrogen cyanide using static mixer
AssigneeInvista North America S.A R.L.
InventorsJohn C. CATON, David W. RABENALDT, William A. McKNIGHT
Life of this patent
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Abstract
A static mixer is disclosed for a hydrogen cyanide reaction process that thoroughly mixes the reactant gases to form a ternary gas mixture that has a coefficient of variation of less than 0.1 across the diameter of the catalyst bed. The static mixer comprises tabs that are inserted through non-continuous slots in the conduit and the tabs are secured to the external wall of the conduit.
Claims22
1-15. (canceled)
A process for producing hydrogen cyanide, comprising:
- introducing a methane-containing gas, an ammonia-containing gas, and an oxygen-containing gas into an elongated conduit to produce a ternary gas mixture, the elongated conduit comprising one or more static mixing zones having at least one non-continuous slot through which a tab is inserted and secured to an external surface of the elongated conduit;
- and
- contacting the ternary gas mixture with a catalyst in a catalyst bed to provide a reaction product comprising hydrogen cyanide.
A reaction assembly for preparing hydrogen cyanide comprising:
- (a) a mixing vessel comprising an elongated conduit having
- an outlet located at a proximal end of the elongated conduit,
- a first inlet port and a second inlet port each for introducing at least one reactant gas selected from the group consisting of a methane-containing gas, an ammonia-containing gas, an oxygen-containing gas, and mixtures thereof, into the mixing vessel, wherein the second inlet port is downstream of the first inlet port,
- a first static mixing zone comprising one or more first rows of non-continuous slots through which one or more corresponding tabs are inserted and secured to an external surface of the elongated conduit, and wherein the first static mixing zone is adjacent to the first inlet port,
- a second static mixing zone comprising one or more second rows of non-continuous slots through which one or more corresponding tabs are inserted and secured to the external surface of the elongated conduit, and wherein the second static mixing zone is adjacent to the second inlet port,
- wherein each corresponding tab has an upstream face that is angled in the flow direction,
- wherein the first and second static mixing zones provide cross-stream mixing of the at least one reactant gas to produce a ternary gas;
- and
- (b) a reactor vessel comprising a reactor inlet that is operatively coupled to the outlet to receive the ternary gas mixture, and a catalyst bed containing a catalyst for producing a hydrogen cyanide stream.
6 more elements
A process for manufacturing a mixing vessel comprising:
- providing one or more tabs having an angled upstream surface having a bevel edge, downstream surface, and a support on the downstream surface, wherein the support has a shape that is selected from the group consisting of an I-shape, I-shape, T-shape, U-shape, and V-shape and extends past the plane of the upstream surface;
- and
- providing an elongated conduit having an internal cavity, a first inlet port, and an outlet port that is connected to a reactor vessel.
Dependencies are inferred from the claim text.