US 4,705,670 AGranted

Multiple oxidation nitrogen fixation

OwnerLouis R. O'Hareinventor

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Abstract

The electric fixation of nitrogen from air is enhanced and made more efficient by the simultaneous multiple use of the electric discharge for both reacting nitrogen and oxygen to nitric oxide and for generating other specific oxidizing agents for the further oxidation of nitric oxide to higher oxides in that this special cell thereby rapidly effects not only the oxidation of nitrogen to nitric oxide but also rapidly oxidizes that nitric oxide to higher oxides of nitrogen products and thereby provides a means for the rapid absorption of the fixed nitrogen products from the electric discharge zone where the discharge would otherwise destroy much of the same product nitrogen which it is generating. The rapidly soluble higher oxides of nitrogen are rapidly absorbed by and held in an aqueous solution of these products flowing within the cell and they are converted directly to nitric acid in the solution as it flows from the cell.

Claims4

Dependent claims

An electric discharge reactor for the production of nitric acid comprising:

an electrically insulating casing in the form of a long rectangular box of high dielectric strength and high thermal shock resistance defining a chamber for both high voltage discharge of about 6000 volts or more and for discharge products absorbtion, and having inlet opening means and outlet opening means for gas and for liquid solution communicating with said chamber;
an electrically conductive liquid electrode flowing through said discharge chamber along the base of the chamber and beneath a discharge zone in the chamber and in physical and electric contact with the discharge, said liquid electrode being an aqueous solution of multiple products of said electric discharge;
an electric discharge electrode plate in physical contact along its lower surface with the top side of said chamber and electrically installed from said discharge zone and from said liquid electrode by the dielectric top side of said casing, thereby producing electric capacitance across said discharge zone for limiting the energy of the discharge and for causing the discharge to be diffused out across the space between the electrodes, thereby controlling the energy density of the discharge through the discharge zone;
power source means for applying a high voltage discharge potential between said plate electrode and said liquid electrode within said chamber, thereby producing an electric discharge within said discharge chamber to form nitric oxide, hydrogen peroxide and ozone, as first products, from nitrogen, oxygen and water supplied to said chamber through said inlet opening means, said first products being absorbed and reacted in said liquid electrode to form nitric acid, said nitric acid being removed from said chamber through said liquid outlet opening means, said power source means including an a.c. high voltage power source which provides from 6000 volts to 20,000 volts connected between said discharge electrodes;
liquid electrode, aqueous solution circulation and cooling means to flow said solution through said chamber in multiple repeated cycles for absorbing the first products of the discharge and then to react them in said solution thereby making said solution increasingly more absorbtive of said gas discharge products, said circulation and cooling means being in the form of a small liquid pump and ducting with cooling fins in circular series fluid flow communication with said reaction chamber through said inlet and exit opening means, said ducting having inlet and exit valves with ports for admitting water and for exiting product nitric acid.

2 more elements

An electric discharge reactor for the production of nitric acid comprising:

an electrically insulating casing in the form of a long rectangular box of high dielectric strength and high thermal shock resistance defining a chamber for both a plurality of electric discharges each of a different energy density and for discharge products absorbtion, and having inlet opening means and outlet opening means for gas and liquid communication with said chamber;
an electrically conductive liquid electrode flowing through said discharge chamber along the base of the chamber and through the base of zones in the chamber in which electric discharges take place and in physical and electric contact with each electric discharge, said liquid electrode being an aqueous solution of the products of each discharge;
a plurality of electric discharge electrode plates each in physical contact along its lower surface with the top side of said chamber and each electrically insulated from said discharge zone and from said liquid electrode by the dielectric top side of said casing, thereby each producing electric capacitance across said discharge zone for limiting the energy of the discharge and for causing the discharge to be spread out across each of the spaces between each electrode plate and the liquid electrode thereby controlling the energy density of each discharge through its discharge zone;
multiple power source means for applying a different frequency and power of high voltage potential of about 6000 volts or more between each plate electrode and said liquid electrode within the chamber, thereby producing discharges each having its own intensity within said chamber each discharge producing high yields of one of
multiple products and each discharge having a particular energy density of discharge to thereby form within the entire chamber a combination of discharge products, nitric oxide, hydrogen peroxide and ozone, from nitrogen, oxygen and water supplied to said chamber through said inlet opening means, said power source means including a plurality of a.c. high voltage power sources each of which different sources being connected to a different one of the plate electrodes and the solution electrode;
liquid electrode, aqueous solution circulation and cooling means to flow said solution through said chamber in multiple repeated cycles for absorbing the gas products from the discharge and to react said products in the solution thereby causing said solution to become increasingly more absorbtive of said products, and being in the form of a liquid pump and ducting, with cooling fins in circular series fluid flow communication with said chamber through said inlet and exit opening means, said ducting having inlet and exit valves with ports for admitting water and for exiting product nitric acid.

3 more elements

An electric discharge reactor for the production of nitric acid comprising:

electric discharge enclosure means in the form of long rectangular boxes of high dielectric strength and high thermal shock resistance each box defining a chamber for both high voltage electric discharge of about 6000 volts or more and for absorbtion of discharge products, and each box having inlet and outlet opening means for gas and for liquid solution flow communicating with each of said chambers;
an electrically conductive liquid electrode flowing through each of said chambers along the base of each chamber and through the base of zones in each chamber in which zones electric discharges take place, and in physical and electric contact with each electric discharge, said liquid electrode being an aqueous solution of a combination of the products of each discharge;
a plurality of electric discharge electrode plates each single plate being in physical contact along its lower surface with the top side of a different one of said chambers and each plate being electrically insulated from the discharge zone of the chamber to which it is attached and from said liquid electrode by the dielectric top side of the chamber to which it is attached, thereby each chamber having electric capacitance across its discharge zone for limiting the energy of the discharge and diffusing the discharge out across the space between the electrode plates in each chamber thereby controlling the energy density of each discharge through its discharge zone in each chamber;
multiple power source means for applying a different frequency and power of high voltage a.c. potential to each chamber to produce different intensity discharges in each chamber for the production of a different discharge product in each chamber, thereby to form nitric oxide in high yields in a chamber having a very high energy density and receiving very high frequency and power and thereby to form hydrogen peroxide in a second chamber having an intermediate energy density and connected to a source of intermediate power, and thereby to form ozone in a discharge chamber having very low energy densities and receiving low power from a low frequency electric source, said power source means including a plurality of a.c. high voltage power sources which provides from 6000 volts to 20,000 volts each of which is connected to one plate electrode and to said electrically conductive solution electrode;
liquid electrode, aqueous solution circulation and cooling means for providing a stream of said aqueous solution through each of said reaction chambers in such a circular fluid flow communication among the chambers that the flow from each chamber is caused to mix and mingle with the flows from the others and then again flow through each chamber in multiple repeated cycles, and in which flow said gas discharge products are absorbed and interacted, thereby providing a highly absorbtive solution for further, more rapid absorbtion of said gas discharge products, said absorbtion and cooling means being in the form of a liquid pump and tubing with cooling fins in circular series fluid flow communication with a parallel group of said reaction chambers, said chambers being connected in parallel to each other by manifold ducting connecting the inlet openings of each to the inlet openings of the others and by other manifold ducting connecting the outlet openings of each together, said tubing having inlet and exit valves with ports for admitting water and for exiting product nitric acid.

2 more elements

Dependencies are inferred from the claim text.