| 摘要 |
The present invention discloses a process for purifying acrylic acid or methacrylic acid by (a) subjecting a mixture comprising acrylic acid or methacrylic acid to a precicely defined separation process, essentially in the absence of an organic solvent, the composition of the phase wherein acrylic acid or methacrylic acid is accumulated remaining essentially constant, while the composition of additional mass transference participating phases changes upon extraction of the first phase, and (b) subjecting at least a part of the remaining phase of step (a) to a less precise defined separation process, and (c) feeding one of the phases formed in stage (b) to the separation process which is precisely defined in step (a). The invention further provides a process for the preparation of acrylic acid or methacrylic acid including the aforementioned purification process.
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