Concentrating and dehydrating apparatus for maleic anhydride
US4659433A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 12, 1983 |
| Grant date | Apr 21, 1987 |
| Priority date | — |
| Expiry date | Aug 12, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/56
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Apparatus for concentrating and dehydrating maleic acid to form maleic anhydride, comprising: at least a first and a second vertical, independent and distinct, falling thin-film, multitubular evaporators of the static type arranged in series, wherein the first thin-film multitubular evaporator of the static type has an upper part and a lower part and includes a feedpipe at the upper part and a discharge pipe at the lower part; a separator connected by its sidewall to the discharge pipe from the first evaporator and including a first discharge pipe at the upper portion thereof and a second discharge pipe at the lower part; the second thin-film multitubular evaporator of the static type having a feedpipe having an upper part and a lower part connected to the second discharge pipe from the separator and including a discharge pipe only at the lower part thereof; a boiler having an upper part and a lower part, said upper part of said boiler being connected to and in open communication with the lower portion of the second evaporator, said boiler being further in communication with a first discharge pipe for liquid at the lower part of the boiler and a second discharge pipe at the upper p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.