http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-4217336-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5c24684033fba97d1ad845ce453a57e3 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C25B3-25 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C25B3-25 |
| filingDate | 1992-05-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1993-12-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | DE-4217336-A1 |
| titleOfInvention | Electrochemical process for the production of glyoxylic acid |
| abstract | In the prodn. of glyoxylic acid (I) by electrochemical redn. of oxalic acid (II) in aq. soln. in (un)divided cells, (a) the cathode consists of (a-1) carbon or (a-2) at least 50 (wt.)% Cu, Ti, Zr, V, Nb, Ta, Fe, Co, Ni, Sn, Zn, Al and/or Cr; and (b) the aq. electrolyte or catholyte contains metal salt(s) (III) with a H2 over-voltage of at least 0.25 V at a current density (c.d.) of 2500 A/dm2. Pref. suitable cathodes consist of (a-1) graphite, or (a-2) at least 50, pref. at least 80% Fe, Co, Ni, Cr, Cu and/or Ti; an alloy of 2 or more of the cited metals; at least 80, partic. at least 93% alloy of 2 or more of Fe, Co, Ni, Cr, Cu and Ti; 93-96% alloy, 0-20, pref. 4-7% other metal, pref. Mn, Ti and/or Mo, and 0-3, pref. 0-1.2% non-metal, pref. C, Si, P and/or S; stainless steel, esp. stainless Cr-Ni steel. (III) is used in a concn. of (a1) 10 power(-6) to 10, pref. 10 power(-5) to 10 power(-1), esp. 10 power(-4) to 4 x 10 power(-2)% or (a-2) 10 power(-7) to 10, pref. 10 power(-6) to 0.1, esp. 10 power(-5) to 0.04%. (III) pref. is a Cu, Ag, Au, Fe, Hg, Tl, Ti, Zr, V, Ta, Ce, Co, Ni or pref., Pb, Sn, Bi, Zn, Cd or Cr salt or combination of these, esp. a Pb salt. The (II) concn. is between 0.1M and the satn. concn. at the electrolysis temp.. The electrolyte may also contain 10 power(-7) to 10, pref. 10 power(-5) to 10 power(-1)% mineral or organic acid. The cell pref. has a separator, esp. of a cation exchange membrane of polymer with COOH and/or SO3H gps.. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-1303252-C |
| priorityDate | 1992-05-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 40.