Process and system for producing high-value xylenol through xylenol fraction isomerization

The invention discloses a process and a system for producing high-value xylenol by isomerization of xylenol fraction, and the process comprises the following steps: rectifying and cutting the xylenol fraction to obtain a mixture fraction of 2, 4-xylenol and 2, 5-xylenol and a mixed xylenol fraction of lean 2, 4-xylenol and 2, 5-xylenol; carrying out melt crystallization on the mixture fraction of the 2, 4-xylenol and the 2, 5-xylenol to obtain a 2, 5-xylenol product and a 2, 4-xylenol product; the method comprises the following steps: carrying out an isomerization reaction on a mixed xylenol fraction lean in 2, 4-xylenol and 2, 5-xylenol to obtain a xylenol-rich material rich in 2, 4-xylenol and 2, 5-xylenol; the method comprises the following steps: mixing melt crystallization raffinate obtained by melt crystallization of a xylenol fraction, a mixture fraction of 2, 4-xylenol and 2, 5-xylenol and a xylenol-rich material, and carrying out rectification cutting on the mixture. Specific components in the mixed