http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-569918-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_f4514ca657e38af94a01f0212e9bd66e |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01C1-24 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01C1-242 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01C1-242 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01C1-24 |
| filingDate | 1943-05-11^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1945-06-14^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-569918-A |
| titleOfInvention | Improvement in ammonium salt production |
| abstract | 569,918. Ammonium salts. SEMET-SOLVAY ENGINEERING CORPORATION. May 11, 1943, No. 7491. Convention date, June 18, 1942. Drawings to Specification. [Classes 1 (ii) and 32] Ammonium salts such as ammonium sulphate, nitrate, phosphate and chloride are obtained in the form of large crystals by heating ammonia containing gases to a temperature of 30-60‹C. and raising their humidity to at least 70 per cent., passing the preheated and humidified gas beneath the surface of a body of solution in a saturator containing free mineral acid and an insufficient amount of ammonium salt to saturate the solution, withdrawing solution from the saturator cooling and concentrating the withdrawn solution to a condition of supersaturation by evaporation under vacuum, passing the supersaturated solution into contact with a suspension of crystals of the ammonium salt, which are thereby increased in size, recirculating the solution to the saturator, adding water and acid to the saturator in such a way as to prevent the concentration of the ammonium salt solution in the body of the saturator from rising to saturation, and effecting circulation of the solution within the saturator to prevent local supersaturation and crystal growth therein. Preferably the process is conducted so as to maintain a constant volume of solution in the saturator at a temperature of 45-50‹C. In the crystallisation stage the supersaturated solution may be passed upwardly through the suspension of, for example, ammonium sulphate crystals, the crystals which reach the desired size being removed from the bottom of the apparatus. The free acid in the saturator is preferably maintained at 1-5 per cent. The formation of incrustations above the liquid level in the saturator may be prevented by the introduction of exhaust steam. Specification 559,360 is referred to. |
| priorityDate | 1942-06-18^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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