| 摘要 |
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 part of the boiler; a scrubber; a condenser having a pipe for discharge of the condensates, said condenser being serially connected between the second discharge pipe from the boiler and the scrubber; and a recycle pipe connecting the discharge pipe from the condenser with the second discharge pipe from the separator.
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