http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-2723563-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_eb2648e65ad8850515bd727a122f1186 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01B15-103 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01B15-10 |
| filingDate | 1977-05-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_dc9cdeec2ca521ba562f77178fe59803 |
| publicationDate | 1978-11-30-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | DE-2723563-A1 |
| titleOfInvention | PROCESS FOR THE PRODUCTION OF SODIUM PERCARBONATE IN THE FORM OF REGULAR RHOMBOEDRIC CRYSTALS |
| abstract | Prepn. of Na2CO3.1.5H2O2 in the form of regular rhombohedric crystals comprises reacting conc. H2O2 with a fluid suspension of Na2CO3.10H2O in a satd. soln. of Na2CO3 Decahydrate is in the form of at least partly, regular rhombohidric crystals and is used in an amt. such that the heat of dissolution balances the heat of crystallisation or the formation of the percarbonate and the other phenomena consume the heat prod., in the presence of a crystallisation modifying polycarboxylate polymer. Pref. 0.2-0.8 wt. % of sulphate ions are present during the decahydrate crystallisation. The suspension may be prepd. by dissolution of anhydrous solid Na2CO3 in the mother-liquor form a percarbonate crystallisation at >=37-38 degrees C, cooling to =32 degrees C lowering to a temp. such the 15-40 % of solid phase is present. The mother liq. pref. contains 1.5-2% NaCl. Suitable crystallisation modifiers are copolymers of maleic anhydride or maleic or fumaric acids with ethylene, propylene isobutylene, styrene, the vinyl ether or furan pref. as 0.01-1 g. per mole of Na2CO3.esp. 0.03-0.1 g. Process avoids the tendency for the percarbonate to adhere to cold surfaces and the need to add stabilisers. The process gives high yields due to efficient heat-exchanging. The prod. is easily cast. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-3125638-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0021498-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/FR-2459203-A1 |
| priorityDate | 1977-05-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 54.