http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-111909011-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C41-58 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C67-54 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C41-56 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C69-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C41-56 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C41-58 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C67-54 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C43-30 |
| filingDate | 2020-07-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2022-11-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2022-11-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-111909011-B |
| titleOfInvention | Separation process of polyoxymethylene dimethyl ether system containing formaldehyde, methanol and water |
| abstract | The invention provides a separation process of a polyoxymethylene dimethyl ether system containing formaldehyde, methanol and water, which adopts multi-stage rectification, and the feed contains methylal, methanol, water, formaldehyde, paraformaldehyde and PODE The mass flow ratio of formaldehyde and methanol is controlled at 1:2 to 5:1 in the rectification tower of 2 , methylal and methanol are separated by extractive distillation, and PODE 2 and water are finally separated by heterogeneous azeotropic distillation. This process overcomes the difficult problem of separating methylal and methanol, and at the same time does not need an extractant recovery tower, saving equipment costs; at the same time, it uses heterogeneous azeotropic distillation to separate water and PODE 2 ; this process combines heterogeneous The organic waste water produced by boiling rectification is introduced into the rectification tower whose feedstock contains formaldehyde at any stage, so that formaldehyde is extracted from the tower kettle in the form of aqueous solution, realizing the recycling of waste water, saving waste water treatment costs and protecting the environment. |
| priorityDate | 2020-07-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 32.