http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-714821-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_04650c4315071ee8af7d26e3441a53b1 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C45-783 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C45-78 |
| filingDate | 1952-10-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1954-09-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-714821-A |
| titleOfInvention | Concentrated formaldehyde solutions |
| abstract | Liquid compositions containing formaldehyde are made by passing formaldehyde vapour of low water content into a liquid aliphatic hydroxy compound so as to absorb the formaldehyde therein while cooling the composition being formed to a temperature at least about 20 DEG C. below its boiling point but not below 50 DEG C. Advantageously the temperature is about 20-40 DEG C. below the boiling point of the composition. The vaporous formaldehyde contains less than 20 per cent by weight of water. The formaldehyde vapours may be anhydrous as obtained by heating alkali precipitated a -polyoxymethylene or may be obtained by vaporizing an aqueous solution of formaldehyde and condensing out part of the water. Hydroxy compounds specified include methanol, isobutanol, ethylene glycol, glycerol and erythritol. Advantageously a circulating system is used in which a solution of the desired concentration is obtained and circulated between a zone where fresh reagents enter the system and a cooling zone, the product being withdrawn at a point remote from where fresh reagents are supplied at such a rate as to keep constant the volume of composition in circulation. With products containing above 70 per cent by weight of formaldehyde it is best to limit the residence time to not more than 120, preferably 60, minutes. Examples show the production of solutions of formaldehyde in n-propanol, methanol and 1,2-propylene glycol. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-1173886-B http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-105272836-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-1171895-B |
| priorityDate | 1951-10-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 33.