Systems and methods for removing hydrogen sulfide from an ammonia stream in the NH3 purification and liquefaction stage of a conventional two-column sour water stripping system using an adsorbent bed.

A manufacturing system of an electronic-grade ammonia solution comprises: a mixing tank to mix an unsaturated ammonia aqueous solution and alkali to obtain a mixing solution; a stripping unit, disposes downstream the mixing tank and comprises a heat exchanger to heat the mixing solution, and a stripping column to mix a nitrogen gas and the heated mixing solution to obtain a mixing gas; a first absorption unit, disposes downstream the stripping unit and comprises a first condensation unit to cool down the mixing gas, and a first absorption column to mix a saturated ammonia aqueous solution and the cooled mixing gas to obtain a purge gas; and a second absorption unit, disposes downstream the first absorption unit and comprises a second condensation unit to cool down a DI water, and a second absorption column to mix the cooled DI water and the purge gas to obtain electronic-grade ammonia solution.

Systems and methods for ammonia purification in the NH3 purification and liquefaction stage of a conventional two-column sour water stripping system using an adsorbent bed.

The present invention relates to a process for preparing alpha-hydroxycarboxylic esters proceeding from hydrogen cyanide, wherein the ammonia formed in the step of alcoholysis of the corresponding alpha-hydroxycarboxamide is recycled into a hydrogen cyanide preparation process after a purification step.

A system for recovering ammonia from an ammonia-containing liquid, which system comprises a waste tank (10) for receiving ammonia-containing liquid entering the system; a filtration unit (14) comprising an ultrafiltration unit for receiving the ammonia-containing liquid from the waste tank (10) and filtering the ammonia-containing liquid to remove solids; an ammonia concentrating unit comprising a reverse osmosis unit (18) for receiving ammonia-containing liquid from the filtration unit (14) and concentrating the ammonia within the liquid; and an ammonia-recovery unit (100) for receiving concentrated ammonia-containing liquid from the ammonia concentrating unit (18) and recovering ammonia therefrom, wherein the ammonia-recovery unit (100) comprises a rectifier (102) for separating ammonia from the concentrated ammonia-containing liquid and recovering the ammonia as ammonia-containing gas; and wherein the system does not comprise an ammonia stripper.

A porous metal-organic framework M(dicarboxylate), where M=a divalent transition metal ion or alkaline earth metal ion, and (dicarboxylate)=a dicarboxylate linker with a layered two-dimensional structure with paddlewheel-type metal nodes forming a three-dimensional structure with rhombic channels along a c axis. The M(dicarboxylate) family of frameworks, where M=Cu, Fe, Cr, Mg, Ca, Mn, Co, Ni, Zn, Mo or Cd and (dicarboxylate)=trans-1,4-cyclohexanedicarboxylate, 1,4-benzenedicarboxylate, 4,4-biphenyldicarboxylate, or 2,3,5,6-tetrafluorobenzenedicarboxylate, reversibly binds ammonia via cooperative insertion into its metal-carboxylate bonds to form a dense, one-dimensional coordination polymer that has rapid adsorption kinetics, a comparatively large working capacity and minimal expansion upon ammonia capture.

A method for separating inert gases, from ammonia gas in an ammonia production plant, comprising the steps of: a) adjusting the temperature of a first gas comprising ammonia gas and the inert gases to a temperature equal to or lower than ?20? C., thereby producing liquid ammonia and an inert gas depleted in ammonia; b) ejecting the inert gas stream produced in step a) to an inert gas station, using a gas stream from the ammonia production plant as the motive gas in a gas ejector, thereby ejecting a gas stream at the outlet of the ejector; and c) using the gas stream from the inert gas station, after its ejection in step b), as the component of a fuel.

A method of supplying ammonia to a gas chromatography-chemical ionization tandem mass spectrometry (GC/CI-MS/MS) includes the steps of: providing ammonium carbonate and diethanolamine in a reaction vessel; heating the reaction vessel to a temperature of 50-60? C. to decompose the ammonium carbonate to form ammonia, carbon dioxide and water; absorbing the carbon dioxide and water by the diethanolamine to form diethanolamine carbonate; and supplying the ammonia to the GC/CI-MS/MS. Another method of supplying ammonia to a gas chromatography-chemical ionization tandem mass spectrometry (GC/CI-MS/MS) includes the steps of: providing ammonium carbonate and a mixture of monoethanolamine and diethanolamine in a reaction vessel; reacting the ammonium carbonate with the monoethanolamine to form ammonia and monoethanolamine carbonate; and supplying the ammonia to the GC/CI-MS/MS.

The present invention provides a decentralized and compact energy production system utilising ammonia for storage-of electric power and ammonia or H.sub.2 for production of electric power and heat suitable for use by a single household or in a small commercial building.

A system for ammonia distillation may include a condenser to condense ammonia vapor into liquid anhydrous ammonia, a flush tank to receive a flushed portion of the liquid anhydrous ammonia, a collection tank to receive a collected portion of the liquid anhydrous ammonia, and a corrosion inhibitor dispenser to transfer a corrosion inhibitor to the collected portion of the liquid anhydrous ammonia to form corrosion-inhibiting liquid anhydrous ammonia.