Back to results
US 11,332,370 B2Granted
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
Life of this patent
Estimating the term…
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.
Claims19
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:
- nitrous oxide;
- and
- optionally nitrogen;
- converting the nitrous oxide present in the offgas to nitrogen oxide by passing the offgas through a reactor operating at a temperature of 2400° F. or greater and a pressure of 10 psig or less to yield a product composition comprising nitrogen oxide;
- compressing the product composition;
- and
- converting nitrogen oxide in the compressed product composition to nitric acid.
5 more elements
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 having a temperature less than 800° F. and comprising
- nitrous oxide;
- and
- optionally nitrogen;
- preheating the offgas in a preheater unit to a temperature less than 1800° F.;
- converting the nitrous oxide present in the offgas to nitrogen oxide at a yield of greater than 15% by passing the offgas through a reactor operating at a temperature of 2400° F. or greater and at a pressure of 10 psig or less to yield a product composition comprising nitrogen oxide;
- and
- converting the nitrogen oxide to nitric acid.
5 more elements
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 having a temperature less than 800° F. and comprising
- nitrous oxide;
- and
- optionally nitrogen;
- preheating the offgas in a preheater unit to a temperature less than 1800° F.;
- converting nitrous oxide present in the offgas to nitrogen oxide at a yield of greater than 15% by passing the offgas through a reactor operating at a temperature of 2400° F. or greater and at a pressure of 10 psig or less to yield a product composition comprising nitrogen oxide;
- compressing the product composition;
- and
- converting nitrogen oxide present in the compressed product composition to nitric acid;
- wherein the reactor has a length to diameter ratio (L/D) of greater than 4;
- and
- wherein no external heat is added to the reactor after start of reaction.
9 more elements
Dependencies are inferred from the claim text.