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Preparation method of molecular sieve for cyclohexene hydration preparation of cyclohexanol

A cyclohexene water, molecular sieve technology, applied in molecular sieve catalysts, hydroxyl addition preparation, chemical instruments and methods, etc., can solve the problems of high conversion rate and low catalyst activity, and achieve high conversion rate, good stability, and yield. rate increase effect

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] So far, in all the reports about using ZSM-5 molecular sieve as cyclohexene hydration catalyst, the synthesis process of molecular sieve catalyst is involved. At present, the industrial synthesis of ZSM-5 technology is relatively mature, but the catalyst activity is relatively low. modification of molecular sieve can make up for this deficiency, so that the conversion rate is high and the selectivity is good in the reaction process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 5 g of NaZSM-5, add 200 mL of ammonium nitrate solution with a concentration of 8 g / L into a 500 mL container, stir at 50 °C for 60 min, filter, wash, dry, and roast at 600 °C for 2 h to obtain HZSM-5 molecular sieve. Then weigh 5.0 g of HZSM-5 and impregnate it in 0.5 g / L Ce(NO 3 ) 3 solution (20 mL) for 10 h, then filtered off the excess solution, dried, and finally calcined at 550 °C for 4 h to obtain the Ce-modified HZSM-5 molecular sieve. The resulting catalyst is labeled CZ-1

Embodiment 2

[0024] Weigh 5 g of NaZSM-5, add 250 mL of ammonium nitrate solution with a concentration of 5 g / L into a 500 mL container, stir at 70 °C for 120 min, filter, wash, dry, and roast at 550 °C for 4 h to obtain HZSM-5 molecular sieve. Then weigh 5.0 g of HZSM-5 and impregnate it in 1.0 g / L Ce(NO 3 ) 3 solution (20 mL) for 10 h, then filtered off the excess solution, dried, and finally calcined at 450 °C for 5 h to obtain the Ce-modified HZSM-5 molecular sieve. The resulting catalyst is labeled CZ-2

Embodiment 3

[0026] Weigh 5 g of NaZSM-5, add 200 mL of ammonium nitrate solution with a concentration of 10 g / L into a 500 mL container, stir at 50 °C for 40 min, filter, wash, dry, and roast at 450 °C for 5 h to obtain HZSM-5 molecular sieve. Then weigh 5.0 g of HZSM-5 and impregnate it in 2.0 g / L Ce(NO 3 ) 3 solution (20 mL) for 15 h, then filtered off the excess solution, dried, and finally calcined at 550 °C for 4 h to obtain the Ce-modified HZSM-5 molecular sieve. The resulting catalyst is labeled CZ-3

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Abstract

The invention relates to a preparation method of a modified ZSM-5 molecular sieve for cyclohexene hydration preparation of cyclohexanol, and belongs to the technical field of catalyst preparation. According to the composition of the catalyst, a ready-made commercial NaZSM-5 molecular sieve is subjected to exchange treatment, then is impregnated with rare earth elements containing Ce and La, and next is subjected to suction filtration, drying and roasting to obtain the modified HZSM-5 molecular sieve. The method is simple in preparation and is used in the cyclohexene hydration reaction, the conversion rate of cyclohexene is high, the cyclohexanol selectivity is high, and the activity of the catalyst has good repeatability.

Description

technical field [0001] The invention relates to a preparation method of modified HZSM-5 molecular sieve. Specifically, the present invention relates to a preparation method of a modified HZSM-5 molecular sieve used for the hydration of cyclohexene to prepare cyclohexanol, and belongs to the technical field of catalyst preparation. Background technique [0002] Cyclohexanol is an important chemical product and chemical raw material. It is an important intermediate for the preparation of adipic acid and caprolactam. Currently, cyclohexene is generally prepared by hydration. Cyclohexene hydration catalysts have eliminated the early inorganic acids and ion exchange resins, and now the cyclohexene hydration production process basically uses molecular sieve catalysts, which are insoluble in water, easy to separate and regenerate, high mechanical strength and good The heat resistance and other advantages have been reported so far with mordenite, Y-type, L-type and ZSM series molec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C35/08C07C29/04
Inventor 秦丽珍张觅孙中华殷玉圣
Owner CHINA PETROLEUM & CHEM CORP
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