http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-736992-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_a37b65085153f7db9825232c61353d89 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_692f1ed35ac3e169fd4b75b4131ac7f2 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_42d0400cbc1b4a4f08145fc2ce4db758 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D301-32 |
| filingDate | 1951-08-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1955-09-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-736992-A |
| titleOfInvention | Improvements in or relating to the manufacture of ethylene oxide |
| abstract | Ethylene oxide containing acetaldehyde as impurity is purified by continuously passing the ethylene oxide in admixture with an alkali metal glycolate dissolved in a quantity of a polyoxyalkylene glycol of molecular weight between 100 and 700 sufficient to render the reaction mixture homogeneous in the liquid phase but not in excess of 5 per cent by volume of the ethylene oxide (as liquid), through a reactor whose internal temperature is maintained between 0 DEG and 180 DEG C., under a pressure sufficient to maintain the reaction mixture in the liquid phase, the reaction conditions including concentration of glycolate and contact time being so chosen that not more than 5 per cent by weight of the ethylene oxide is reacted, and recovering purified ethylene oxide from the product. In the preferred process, the alkali metal glycolate is the sodium, potassium or lithium glycolate of the glycol solvent, the glycol has a molecular weight of about 400, the temperature is between 30 DEG and 100 DEG C., the pressure between 100 and 2000 lbs. per square inch, the alkali-metal concentration between 0.010 and 0.025 gm. atoms per litre of reaction mixture, the volume ratio of glycol to ethylene oxide from 1 to 20-100 and the contact time about 1 to 120 minutes, especially 20 or less minutes. An acetaldehyde content of 0.67 per cent may thereby be reduced to 0.048 or less. Examples are given wherein, using illustrated apparatus (not shown), ethylene oxide and glycol solution containing sodium glycolate are separately pumped into a mixing device from which the mixture passes to a 72 ft. tubular reactor of 0.154 inch bore maintained at about 95-100 DEG C. and provided at its exit with a pressure let-down valve allowing the desired pressure to be maintained in the reactor; the reaction product then passes to a still operated under normal pressure wherein purified ethylene oxide is distilled off and the residue passed to waste. Specification 736,991 is referred to. According to the Provisional Specification, the purification is effected by means of any basic material dissolved in a sufficient quantity of organic hydroxy compound to render the reaction mixture homogeneous in the liquid phase and is restricted to use of a contact time of between 1 and 120 minutes. Specified organic hydroxy compounds are methanol, ethanol, ethylene glycol, diethylene glycol, any polyoxyethylene glycol and a polyoxypropylene glycol. |
| priorityDate | 1951-08-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 31.