http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1138238-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_94ff2d78578d95d1e8d3a2233c76188d |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C11D3-361 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07F9-386 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C02F5-14 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C11D3-36 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C02F5-14 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F9-38 |
| filingDate | 1966-07-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1968-12-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1138238-A |
| titleOfInvention | Process for preparing hydroxydiphosphonic acids from elemental phosphorus and carboxylic acids |
| abstract | 1,138,238. Hydroxydiphosphonic acids. PROCTER & GAMBLE CO. 29 July, 1966 [29 July, 1965; 31 May, 1966], No. 34223/66. Heading C2C. Hydroxydiphosphonic acids are prepared by (a) dispersing yellow or white phosphorus in an organic medium containing or consisting of a carboxylic acid, (b) introducing an oxidizing gas into the dispersion with vigorous mixing to form in situ an acid anhydride of trivalent phosphorus which then reacts with the carboxylic acid to form phosphite intermediates, (c) maintaining the reaction mixture at 70-170‹ C. either during or subsequent to the oxidizing step (b) or both to convert the phosphite intermediates to compounds containing P-C bonds and (d) hydrolysing the mixture with water to form a hydroxydiphosphonic acid. The carboxylic acid can suitably be an aliphatic mono- or poly-carboxylic acid having 2-30 carbon atoms, acetic acid being especially preferred. The acids may also be hydroxy or other substituted acids, e.g. phenylacetic acid or hydroxyacetic acid, and may be saturated, unsaturated, straight chain or branch chain. Mixtures of the above classes of acids may also be used. The preferred proportion of acid to phosphorus is 2-25 carboxylic groups per mole of phosphorus (P 4 ). The phosphorus should be dispersed in a finely divided state in the organic medium, optionally with heating, to give a particle diameter of preferably less than 2 cm., the term " dispersion " being defined as including any suspensions of finely divided solid or liquid particles in a liquid medium, the particles being of colloidal dimensions or larger, and molecular dispersions. The oxidizing gas may be oxygen and/or ozone, or air and may be added stepwise or incrementally, preferably at 20-140‹ C. The oxidizing step may be carried out in a stirred tank or a series of stirred tanks or with the oxidant gas flowing countercurrent to the dispersion in an agitated column. The phosphorus and acid may be reacted in the presence of a diluent such as excess acid, (C 3 H 7 ) 2 SO 2 , sulpholane, tetrachloroethane, (C 4 H 9 ) 2 O and diglyme. The free acid product may be neutralized with a base, e.g. NaOH or KOH, to form the corresponding salt. The hydrolysis step is suitably carried out at 90-170‹ C. When the carboxylic acids are solid at room temperature, a solvent may be used such as hydrocarbons, ethers and halogenated hydrocarbons such as CCl 4 , CS 2 and chlorobenzene. The solvent may also be selected from the diluents mentioned above. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-9777027-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-2016534077-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2015059287-A1 |
| priorityDate | 1965-07-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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Total number of triples: 54.