Method for producing m-cresol
A technology for the production of m-cresol and m-cresol, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of high cost, cumbersome operation, and inability to obtain m-cresol, and achieve the effect of increasing yield
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Embodiment 1
[0049] Using industrial cresol as raw material, wherein the weight percentages of o-, m-, p-cresol and xylenol are respectively 24%, 42%, 28%, 6%, the isomerization reactor is a fixed-bed reactor, and the catalyst is Hydrogen type ZSM-5, the ratio of silicon to aluminum is 38, and the reaction space velocity is 0.4h -1 , the reaction temperature is 400°C, and the reaction pressure is 0.2Mpa. The reaction product is separated by rectification to obtain a mixture of xylenol product, o-cresol and m-p-cresol, and the separated o-cresol is returned to the fixed-bed reactor to carry out the isomerization reaction again.
[0050] Using urea as complexing agent, the molar ratio of its added amount to the m-cresol in the m-p-cresol mixture is 0.6:1, the complexation reaction temperature is 60°C, and the time is 2h. After the reaction is completed, slowly add petroleum ether with a boiling range of 60-90°C from the solvent tank 1, and the mass ratio of the amount of petroleum ether to ...
Embodiment 2
[0054] The experimental device and operation are the same as in Example 1, except that the isomerization catalyst is hydrogen type ZSM-5, and the silicon-aluminum ratio is 120. The experimental results are shown in Table 1.
Embodiment 3
[0056] The experimental device and operation are the same as in Example 1, except that the isomerization catalyst is mordenite. The experimental results are shown in Table 1.
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