Regeneration method of cyclohexene hydration catalyst

A cyclohexene hydration and catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effect of regeneration

Active Publication Date: 2013-01-16
CHINA TIANCHEN ENG +3
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Patent CN1092626C discloses a method of using zeolite as a catalyst to produce cyclohexanol through cyclohexene hydration, and proposes to improve the li

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  • Regeneration method of cyclohexene hydration catalyst

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Embodiment Construction

[0020] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. However, the drawings and specific embodiments do not limit the present invention.

[0021] Part of the catalyst with reduced activity (about 1% of the total amount of catalyst) from the reaction system enters the stripper, and the entrained cyclohexene and cyclohexanol are removed by steam stripping. The stripping pressure is 10KPaG and the temperature is 102 ℃. The stripping ends when the content of organic matter in the tail gas components is lower than 10ppm. After air stripping, the slurry enters the oxidation tank, and 20% hydrogen peroxide is introduced for oxidation treatment. The amount of hydrogen peroxide is 10% of the catalyst amount, the oxidation pressure is normal pressure, and the temperature is 90°C. The catalyst after oxidation treatment is filtered to remove acid water. After the filtration is completed, add high-purity wa...

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Abstract

The invention relates to a regeneration method of a cyclohexene hydration catalyst. The regeneration method includes steps that: molecular sieve catalyst water solution with activity reduced in a cyclohexene hydration reaction is subjected to gas stripping so as to remove entrained organics, the catalyst solution is subjected to oxidization for further oil removing, and the catalyst with oil removed is subjected to filtering for impurity removing and harmonious stabilizing. The activity of the catalyst obtained after the steps is restored in the maximum limit, and the catalyst is directly sent back to a hydration reaction system by a pump for cycle use. The regeneration method of the cyclohexene hydration catalyst enables the catalyst activity to restore to be above 95% of the initial activity, and achieves online regeneration of the catalyst when the catalyst is in the slurry state same as that in a reactor.

Description

technical field [0001] The invention relates to a cyclohexene hydration process, in particular to a cyclohexene hydration catalyst regeneration method. Background technique [0002] Molecular sieve catalyst is used in cyclohexene hydration to prepare cyclohexanol because of its special catalytic performance. However, as the reaction proceeds, the activity of the catalyst will decrease. On the one hand, the organic matter in the reaction system occupies the acidic active center of the catalyst, causing the passivation of the catalyst. In addition, nitrogen-containing compounds, metal ions, etc. are also highly toxic to the catalyst, and the accumulation of various catalyst poisons also leads to a decrease in activity. In order to maintain the activity of the catalyst and keep the reaction going on normally, measures need to be taken to restore the performance of the catalyst. [0003] Patent CN1052468C discloses a cycloolefin hydration method, which uses a crystalline alumi...

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Application Information

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IPC IPC(8): B01J29/90C07C35/08C07C29/04
CPCY02P20/584
Inventor 刘新伟李岩董强徐航程鹏杨克俭柴永峰王刚王敬伟李碧柳李广忠郑仁姚立东王美娇
Owner CHINA TIANCHEN ENG
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