DE31237C - Process for the preparation of ammonia or highly concentrated ammonia water - Google Patents

Claims (1)

IMPERIAL PATENT OFFICE. In the representation of ammonia, the ammoniacal liquid is primarily the ammonia water, which is produced in the dry distillation of coals, bones, peat etc. is obtained, mixed with caustic lime in the traditional manner and subjected to distillation. The presence of the lime sludge in the stills makes the perfect one Stripping of the ammonia is made much more difficult; and is the later removal of the lime residue an inconvenient and uncomfortable procedure. In order to prevent these evils, I separate the insoluble ones formed by causticization Lime compounds before distillation with the aid of a filter press or centrifuge from, the sulfur compounds present being removed beforehand in a known manner can. After the lime compounds have separated, the. Distillation much easier of equip, the ammonia can be obtained without loss and the 'distillation in the simplest possible way Way can be carried out in a continuously acting column apparatus. The same Process can also be used in the production of concentrated ammonia water (so-called concentrated gas water) come into use. The ones that have been used so far, continually working stills supply the concentrated ammonia water in only one Strength of approx. 12 to 15 pCt. Ammonia. With a higher concentration, excretions and blockages of the cooling devices occur immediately by carbonate of ammonia. But becomes the carbonic acid of the ammonia compounds precipitated completely or only partially in the raw ammonia water by quicklime, and the resulting insolubles become Lime compounds, as stated above, are removed before the distillation, so you can concentrated ammonia water in column apparatus in any concentration produce directly, whereby a high-percentage distillate and thus a transportable commodity is won. When practicing the process, the 'raw ammonia water or gas water is in a Brought container and with milk of lime or dry hydrated lime in known proportions Thoroughly mixed by means of agitators. When the decomposition is complete, the mixture is fed to a filter press or centrifuge, the solid compounds are separated from the liquid and the latter from the distillation subject. In the production of concentrated ammonia water only a part of the carbonate of ammonia needs to be decomposed by lime, and only so much that the distillate does not crystallize out in the cooling devices at the highest concentration.
Patent claim: The process that formed during the causticization of liquids containing ammonia produced lime deposits to be completely separated from the liquid prior to distillation, to which Purposes, the latter for treatment in continuously operating stills Suitable for the preparation of ammonia or high-percentage concentrated ammonia water close.