http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-2355642-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5644544de4541811124b95911dadaf30 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01F11-48 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/D21C11-02 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D21C11-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01F11-48 |
| filingDate | 1973-11-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_61082377cb315099bbeda5761d4d3154 |
| publicationDate | 1975-05-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | DE-2355642-A1 |
| titleOfInvention | METHOD FOR TREATMENT OF MAGNESIUM BASED SULPHITE DRAIN |
| abstract | The spent lye contains 2000-6500 ppm Mg and 250-600 ppm Ca, the Ca is pptd. as CaSO3 by (a) adding Mg(OH)2 MgO, MgSO3, MgCO3, dolomite, brucite or magnesite so the soln. contains min. 8000 ppm Mg cations pref. 10,000-15,000 ppm Mg, (b) adding Ca(OH)2, CaO, CaCO3, CaSO3, brucite, limestone, chalk or dolomite so the dissolved Ca is increased to 1000-3000 ppm, (c) adding SO2, MgSO3, (NH4)2 SO3, CaSO3, or Na2SO3, so sufficient sulphite ions are present to ppte. all the Ca, SO2, being the pref. addn. during pptn. of the CaSO3 the pH is 5-7, pref. 5.5-6.5 and (e) removing the CaSO3. The lye is used for the sulphite treatment of wood and other cellulose materials and it is desired to reclaim Mg, but the Ca salts form boiler scale in the evaporators and interfere with the recovery of Mg. The Ca arises from the wood, impurities in the water, and various treatment chemicals. More efficient and less expensive than existing processes for removing Ca. |
| priorityDate | 1973-11-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 47.