Method for producing nitrous acid ester, and method for producing dialkyl oxalate and dialkyl carbonate
US9499473B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 2013 |
| Grant date | Nov 22, 2016 |
| Priority date | — |
| Expiry date | Nov 20, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C68/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for producing nitrous acid ester in which nitric oxide, oxygen, and an alcohol are reacted, thereby generating nitrous acid ester includes a step of generating nitrous acid ester by supplying a bottom liquid from a bottom part of the reaction column, and nitric oxide and/or carbon monoxide, a step of supplying nitrous acid ester to the reaction column; a step of supplying a reaction liquid containing water, nitric acid, and the alcohol to a nitric acid condensing column from the reactor; and a step of separating a low-boiling point component by distillation from the reaction liquid under control of a concentration of the alcohol in a condensed liquid being generated at a bottom part of the nitric acid condensing column to be less than 4.0% by weight so as to introduce the condensed liquid into the reactor from the nitric acid condensing column.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.