http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4273754-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_2baf849d216e689ecc40ccc931a7a7bc |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01B21-50 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01B21-50 |
| filingDate | 1980-04-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1981-06-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_78f9f8fe1c7da96603b277b89cbebc3d http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0cd257efc03ab4d0c4d4d7c26797a106 |
| publicationDate | 1981-06-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-4273754-A |
| titleOfInvention | Process for producing aqueous solution of calcium nitrite |
| abstract | An aqueous solution of calcium nitrite having high purity and high concentration is obtained by contacting a nitrogen oxides containing gas with an aqueous slurry of calcium hydroxide. n It is necessary to use the aqueous slurry having high calcium hydroxide content such as 20 to 40 wt. %, whereby it is necessary to feed the gas having high nitrogen oxides concentration such as 5 to 12 vol. % to give high conversion to calcium nitrite. In order to prevent a formation of a by-product of calcium nitrate, a nitrogen oxides containing gas having 5 to 12 vol. % of a nitrogen oxides concentration and 1.5 to 2.5 of a molar ratio of NO/NO 2 is fed under a high pressure enough to prevent a condensation of said slurry as a first stage and then, the unabsorbed gas is oxidized and the resulting gas having 1 to 5 vol. % of a nitrogen oxides concentration and 1.6 to 2.5 of molar ratio of NO/NO 2 is fed to the aqueous slurry having 2 to 12 wt. % of a calcium hydroxide obtained in the first stage so as to convert the residual calcium hydroxide to calcium nitrite without forming a by-product of calcium nitrate. The process is carried out as continuous process having a first reaction zone and a second reaction zone. |
| priorityDate | 1980-04-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 24.