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US 2019/0169029 A1Published application
Process for preparation of nitrogen oxides and nitric acid from nitrous oxide
AssigneeAscend Performance Materials Operations LLC
InventorsGregory E. Bush, Darrick K. Elmore, Mikhail I. Khramov
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Abstract
Described herein is an improved conversion of nitrous oxide (N2O) present as a by-product in a chemical process to NOx which can be further converted to a useful compound or material, such as nitric acid.
Claims20
A process for preparing adipic acid, comprising:
- reacting at least one of cyclohexanone and cyclohexanol with nitric acid to produce adipic acid and an offgas comprising at least 10 mol % nitrous oxide (N2O);
- converting the N2O present in the offgas to nitrogen oxide (NOx) (x=1 or 2) in a yield of greater than 15% by passing the offgas through a reactor operating at a temperature of 2200° F. or greater;
- converting the NOx to nitric acid;
- and
- optionally recycling the nitric acid to produce additional adipic acid.
2 more elements
A reaction system for converting nitrous oxide (N2O) present in a feedgas to nitrogen oxide (NOx) (x=1 or 2), comprising:
- a preheater configured to heat a feedgas entering a reactor and to cool a reaction product exiting from the reactor;
- the reactor configured to convert N2O to NOx;
- a first quench unit configured to cool the reaction product entering the preheater;
- and
- an optional second quench unit configured to cool the reaction product downstream of the preheater.
2 more elements
A self-sustaining process for preparing nitrogen oxide (NOx) (x=1 or 2) from nitrous oxide (N2O), comprising:
- preheating a reactor to a temperature of greater than 1600° F.;
- passing a feedgas comprising N2O through the reactor operating at a temperature sufficient to convert the N2O to NOx in a yield greater than 15%,
- wherein heat generated by reaction of the N2O in the reactor is used to preheat the feedgas to a temperature between 900 and 1600° F. prior to entry of the feedgas into the reactor at a rate that does not require application of an external heat source to sustain the conversion.
A process for converting nitrous oxide (N2O) to nitrogen oxide (NOx), comprising:
- obtaining a feedgas containing N2O;
- optionally subjecting the feedgas to conditions sufficient to increase the concentration of the N2O in the feedgas;
- optionally treating the feedgas to reduce the amount of one or more components present in the feedgas having a negative impact on conversion of the N2O to NOx;
- converting the N2O in the feedgas to NOx by passing the feedgas through a reactor operating at a temperature range sufficient to convert the N2O to NOx in a yield of greater than 15%;
- and
- optionally converting the NOx to a different compound or material.
3 more elements
Dependencies are inferred from the claim text.