http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-501840-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_33b011e77b33662b8bf1f2ff2de7b661 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01B17-60 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01B17-60 |
| filingDate | 1937-06-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1939-03-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-501840-A |
| titleOfInvention | Improvements in and relating to the removal of sulphur dioxides from gases |
| abstract | 501,840. Removing sulphur dioxide from gases; metal sulphites. BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS. June 1, 1937, No. 16222. Convention, date, March 24. [Classes 1 (ii) and 1 (iii)] Sulphur dioxide is removed from gaseous mixtures by absorbing it in an aqueous solution essentially comprising a soluble sulphite and a soluble bisulphite, the solution being then treated with a metal oxide capable of forming an insoluble Sulphite, the precipitated insoluble sulphite being removed and the solution being neutralized for treating fresh gaseous mixture. The aqueous solution may comprise the sulphites and bisulphites of one or more of the ,cations sodium, potassium, lithium and ammonium. Suitable metal oxides to precipitate the insoluble sulphite are those of calcium, magnesium, zinc, strontium, barium lead or cadmium. The insoluble sulphite may be discarded (e.g. in the case of using lime), collected as a valuable product or calcined to produce concentrated sulphur dioxide and metal oxide for re-use in the process. Waste gases containing sulphur dioxide are scrubbed in a scrubber 1 by means of an aqueous solution of sodium sulphite and bisulphite introduced through a distributer 4. The exhaust gases pass away through 3 while the solution collects in a sump 5, passing through a settling tank 7 in which suspended solids are removed and being pumped by a pump 9 through a proportioner 12 to a mixer 16 into which, zinc oxide is introduced from a container 18. The solution is fed from the lower end of the mixer 16 to the upper end of a mixer 22 and the mixture is then discharged into a settler 22 in which the greater part of the insoluble sulphite slurry is removed through a line 26 to a filter 28. The clear liquor having its original ratio of sulphite to bisulphite is pumped from the settler by a pump 30 through a line 32 to the scrubber 1. The insoluble sulphite sludge is filtered and washed in the continuous filter 28, the filtrate passing to the pump 30 and the solid being dried in the unit 34. The dried solid passes to an indirectly heated drum 39, sulphur dioxide being liberated and the solid metal oxide being returned to the container 18. Sulphate accumulating in the circulating solution by oxidation, absorption of sulphuric acid &c. may be removed by withdrawing a position of the solution passing from the settling tank 7, saturating it with a portion of the sulphur dioxide from the calciner 39 in a saturator 14 and treating the thus acidified solution with a bisulphite of a metal forming- an insoluble sulphate such as calcium bisulphite in an agitator 48. The resulting calcium sulphate precipitate is removed by means of a settler 53 and a filter 55, the clarified liquor being pumped through a line 59 to re-join the main flow passing to' the proportioner 12. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-2511291-A1 |
| priorityDate | 1937-03-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 49.