A process for the manufacture of frozen gas hydrates, the process comprising passing a liquid aqueous phase over a heat exchanger surface under an atmosphere of a pressurised water-soluble gas, characterised in that the conditions of the process are selected to ensure that there is simultaneous dissolution of the pressurised gas into the liquid aqueous phase, and the formation of a solidified continuous phase from solidification of the liquid aqueous phase in contact with the heat exchanger surface.

A process for the manufacture of frozen gas hydrates, the process comprising passing a liquid aqueous phase over a heat exchanger surface under an atmosphere of a pressurised water-soluble gas, characterised in that the conditions of the process are selected to ensure that there is simultaneous dissolution of the pressurised gas into the liquid aqueous phase, and the formation of a solidified continuous phase from solidification of the liquid aqueous phase in contact with the heat exchanger surface.

This invention is aimed at recovering and purifying nitrous oxide from the gas stream containing N.sub.2O to produce different grade of nitrous oxide by combination of unit operation including, but not limited to, wet scrubbing, adsorption, liquefaction, flash distillation or continuous distillation with reflux.

This invention is aimed at recovering and purifying nitrous oxide from the gas stream containing N.sub.2O to produce different grade of nitrous oxide by combination of unit operation including, but not limited to, wet scrubbing, adsorption, liquefaction, flash distillation or continuous distillation with reflux.

The invention relates to a method for nitrogen removal from aqueous medium, comprising steps of (a) converting NH.sub.4.sup.+ in the aqueous medium to NO.sub.2.sup.? by partial aerobic nitrification, (b) partially reducing the obtained NO.sub.2.sup.? to N.sub.2O in anoxic conditions, and (c) decomposing N.sub.2O to N.sub.2 with energy recovery. A mixture of ferrous sulfate and ferric sulfate is used in step (b) for reduction of NO.sub.2.sup.? to N.sub.2O.

The invention relates to a method for nitrogen removal from aqueous medium, comprising steps of (a) converting NH.sub.4.sup.+ in the aqueous medium to NO.sub.2.sup.? by partial aerobic nitrification, (b) partially reducing the obtained NO.sub.2.sup.? to N.sub.2O in anoxic conditions, and (c) decomposing N.sub.2O to N.sub.2 with energy recovery. A mixture of ferrous sulfate and ferric sulfate is used in step (b) for reduction of NO.sub.2.sup.? to N.sub.2O.

The present invention provides a process for the manufacture of frozen gas hydrates, the process comprising passing a liquid aqueous phase over a heat exchanger surface under an atmosphere of a pressurised water-soluble gas, characterised in that the conditions of the process are selected to ensure that there is simultaneous dissolution of the pressurised gas into the liquid aqueous phase, and the formation of a solidified continuous phase from solidification of the liquid aqueous phase in contact with the heat exchanger surface.

The present invention provides a process for the manufacture of frozen gas hydrates, the process comprising passing a liquid aqueous phase over a heat exchanger surface under an atmosphere of a pressurised water-soluble gas, characterised in that the conditions of the process are selected to ensure that there is simultaneous dissolution of the pressurised gas into the liquid aqueous phase, and the formation of a solidified continuous phase from solidification of the liquid aqueous phase in contact with the heat exchanger surface.

A N.sub.2O decomposition reactor and a method of its use to produce an effluent suitable for use in an ignition device or in the main fuel injection system in high speed aircraft. N.sub.2O decomposition is an exothermic reaction and produces a high temperature product containing high concentrations of O.sub.2. Combination of fuel with this effluent ignites quickly and is an effective ignition source for the aircraft combustor. Reactor performance is adjusted to meet the conditions required for a selected application by changing the relative concentrations of CO.sub.2 and N.sub.2O, modifying the reactor length, and varying the quantity of catalyst in the reactor. For use in a pilot ignition device, the desired effluent temperature is between 500? C. and 1200? C. in order to ignite and combust the fuel within the design residence time, between 0.5 and 10 ms. For application as a barbotage gas generator in a fuel injection system, the temperature of the effluent can range from 300? C. up to 800? C. and it is desirable that the effluent temperature remains within this range for periods of up to two minutes.

A N.sub.2O decomposition reactor and a method of its use to produce an effluent suitable for use in an ignition device or in the main fuel injection system in high speed aircraft. N.sub.2O decomposition is an exothermic reaction and produces a high temperature product containing high concentrations of O.sub.2. Combination of fuel with this effluent ignites quickly and is an effective ignition source for the aircraft combustor. Reactor performance is adjusted to meet the conditions required for a selected application by changing the relative concentrations of CO.sub.2 and N.sub.2O, modifying the reactor length, and varying the quantity of catalyst in the reactor. For use in a pilot ignition device, the desired effluent temperature is between 500? C. and 1200? C. in order to ignite and combust the fuel within the design residence time, between 0.5 and 10 ms. For application as a barbotage gas generator in a fuel injection system, the temperature of the effluent can range from 300? C. up to 800? C. and it is desirable that the effluent temperature remains within this range for periods of up to two minutes.