Nitrous Oxide Gas Plant

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Separation from adipic acid off gas
About separation from adipic acid off gas. It’s used because hexanedioic acid process units by-product nitrous oxide, general adipic acid per ton can about produce 0.28 ton of nitrous oxide, Nitrous oxide content has close to 50% (wt) and recycles value well in tail gas.
The method for preparing high-purity nitrous oxide using adipic acid production tail gas, using following steps：
(1) absorption pretreatment process: adipic acid produces tail gas and enters absorption tower, the absorbing liquid of in bottom of the tower will absorb most of the CO2、NO2 and H2O.
(2) cryogenic rectification process：the air-flow that adsorbent equipment comes out enters low-temperature fractionating tower. High purity nitrous oxide is obtained from low-temperature purifying method column.
(https://patents.google.com/patent/CN105110304B/en)
Thermal decomposition of ammonium nitrate (NH4NO3)
Nitrous oxide is produced by careful heating of ammonium nitrate at about 250℃, which decomposes into nitrous oxide and water vapour：
NH4NO3 → 2 H2O + N2O
Ammonium Nitrate is decomposed in the Melters to give a mixture of Nitrous Oxide & super heated steam. At the same time impurities are produced including Ammonium Nitrate fumes, Nitrogen & other oxides of Nitrogen. The steam & impurities are removed by scrubbing with water, caustic soda and sulphuric acid in sequence. Nitrogen present in traces is removed by bleeding from the top of storage vessels where Nitrous Oxide is stored, after compression by a compressor.
Nitrous oxide from this method is approved by WHO, FDA and GB standard for food additive.
(https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?fr=173.360)

For food grade nitrous oxide for sale, including whip cream chargers, please confirm the nitrous oxide is produced by thermal decomposition of ammonium nitrate.
Nitrous oxide produced from this method is usually used in electronic industry. It’s not approved for food grade. Food using nitrous oxide only produced by the last method.

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