- Kinetics of the electrocatalytic oxidation of 2,2-dimethylolpropionaldehyde
-
A new method of synthesis 2,2-dimethylolpropionic acid from 2,2-dimethylolpropionaldehyde was put forward. The electrochemical oxidation behavior of 2,2-dimethylolpropionaldehyde has been investigated on a Ti/SnO 2 + Sb2O4/PbO2 electrode by cyclic voltammetry (CV) and stable polarization curves in sulfuric acid. The results showed that it was an irreversible reaction controlled by diffusion. The formation mechanism of 2,2-dimethylolpropionic acid in the sulfuric acid was then proposed and the transfer coefficients of the reaction were calculated. It was concluded that RCHO+OHads→RCHOOHads was the rate-determining step in the electrolysis process. The rate of this step obtained from the assumed process agrees well with experiment.
- Liang, Zhenhai,Sun, Hongyan
-
-
Read Online
- Method for synthesizing BDO by using 2 - device byproduct 2 hydroxymethyl propionaldehyde and 2 -dimethylolpropionic acid
-
The invention provides a method for producing BDO by using 2 - byproduct 2 hydroxymethyl propanal, in particular: 2 - hydroxymethyl propanal is condensed under the action of an alkali catalyst, and formaldehyde is condensed to obtain 2 - and 2 dimethylolpropionic aldehyde intermediate which is catalytically oxidized to obtain 2 - and 2 2 - dimethylolpropionic acid. The synthetic route is novel, and by-product BDO hydroxymethyl propanal produced in 2 - process by allyl alcohol method is a starting material and is condensed. 2, 2 Dimethylolpropionic acid is obtained through the oxidation and the like to obtain 2 - and the byproduct of the waste is comprehensively utilized, BDO device three wastes are reduced, a new product can be sold, and the economical efficiency of the device is effectively improved.
- -
-
Paragraph 0014; 0051-0053; 0054-0056; 0057-0059; 0060; ...
(2021/09/08)
-
- Method for isolating polymethyl alkanoic acids and disposal of the resulting wastes
-
A process for isolating polymethylolalkanoic acids or monomethylolalkanoic acids of the formula (I) where R are identical or different and are each a substituted or unsubstituted hydrocarbon radical or a methylol group, which have been prepared from the corresponding polymethylolalkanals or monomethylolalkanals of the formula (II) where R are as defined above, by oxidation using an aqueous solution of hydrogen peroxide comprises a) carrying out a crystallization followed by a liquid/solid separation (B) to give the acid as first crystallized material (2a) plus mother liquor (3), b) producing further crystallized material (2b) in the mother liquor (3) and separating the resulting mother liquor (3) from the further crystallized material (2b) in a further solid/liquid separation (C), and c) disposing of the resulting mother liquor (3) which has been depleted in the acid.
- -
-
-
