| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c7ad58d3c0b071069a8ee0cb8c8ba2e8 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C45-81
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C45-783
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C45-82
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C45-38 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C45-82
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C45-38
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C47-055
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C47-052
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C45-81
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C45-78 |
| filingDate |
1989-06-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1991-02-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_837a7a7c2426f07f419256793c432db5
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_39692c24c981a34ff83c5b29a05eeb31
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_a05e085c0b56cf1158860aad1108c35a
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_66ae0a85e4568d41cda6416c1aaa3dec |
| publicationDate |
1991-02-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-4990685-A |
| titleOfInvention |
Process for the preparation of aqueous formaldehyde solutions |
| abstract |
In a process for the preparation of aqueous formaldehyde solutions consisting of the following steps: n (a) reaction of a methanol/water/air mixture in vapor form at elevated temperature over a catalyst, n (b) absorption of the reaction mixture in one or more successive absorption stages with the formation of a methanol-containing aqueous formaldehyde solution and n (c) removal by fractional distillation of a fraction esentially containing methanol and water, n the methanol/water/air mixture which is required for the reaction is evaporated by means of heat which is withdrawn by indirect heat exchange from the formaldehyde solution being formed in the absorber and/or at least some of the vapors obtained by fractional distillation are condensed by means of liquid water. This condensate is fed together with fresh methanol and with air into the evaporator which is upstream from the catalyst stage. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0748786-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2007111553-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-106349043-B
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6448448-B1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-107108423-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-106349043-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-112920029-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6653487-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2016079544-A1 |
| priorityDate |
1988-07-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |