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Activator for producing glycol by catalytic hydrogenation method

A technology for catalytic hydrogenation and catalyst, which is applied in the direction of hydrolysis preparation, etc., can solve the problems of reducing the activity of the catalyst and the proportion of pores in the catalyst is small.

Inactive Publication Date: 2007-09-12
JIANGSU POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, low molecular weight polyvinyl alcohol can easily lead to a small proportion of pores in the catalyst and reduce the catalyst activity.

Method used

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  • Activator for producing glycol by catalytic hydrogenation method
  • Activator for producing glycol by catalytic hydrogenation method
  • Activator for producing glycol by catalytic hydrogenation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～2

[0018] 1. In a 500mL four-neck flask equipped with a stirrer, a thermometer, and a condenser, add 22.9g of nickel-aluminum alloy with a particle size of about 1.6-2.0mm, add about 180ml of NaOH solution with a mass fraction of 10%, and keep it warm at 80°C Stir for 3 hours, and after no gas is released, wash with deionized water until neutral to obtain catalyst (a), which is stored in absolute ethanol until use. The change of aluminum content was measured, and the removal rate of aluminum was calculated to be 30%. Fill a fixed bed with an inner diameter of 10mm and a length of 4cm with 8mL of catalyst (a), for ethylene glycol with a mass concentration of 12.5%, at a bed temperature of 80°C, a hydrogen pressure of 0.05MPa, and a space velocity of 55h -1 Under the conditions of catalytic hydrogenation, the hydrogenation reaction liquid was rectified to collect the ethylene glycol fraction to obtain the ethylene glycol product. The ultraviolet light transmittance of the feed, out...

Embodiment 3～4

[0023] 3. In a 500mL four-necked flask equipped with a stirrer, a thermometer, and a condenser, add 30g of nickel-aluminum alloy with a particle size of 2.0-3.0mm, add 130mL of deionized water, raise the temperature to 85°C, and add 15% NaOH solution dropwise 80mL, control the temperature not higher than 95°C, stir at low speed for 1h, keep warm at 93°C±2°C, stand still for 2h, then add 40mL of 15% NaOH solution dropwise, stand still for 0.5h, wash with deionized water until neutral, and prepare the catalyst (b), stored in absolute ethanol until use. The change of aluminum content was measured, and the removal rate of aluminum was calculated to be 25%. Fill 12.5mL of catalyst (b) in a fixed bed with an inner diameter of 20mm and a length of 3cm. For ethylene glycol with a mass concentration of 85%, the bed temperature is 67°C, the hydrogen pressure is 0.25MPa, and the space velocity is 40h -1 Under the conditions of catalytic hydrogenation, the hydrogenation reaction liquid i...

Embodiment 5～6

[0028] 5. As in Example 3, take 12.5g of nickel-aluminum alloy with a particle size of 1.0-1.6mm, add 55mL of deionized water, raise the temperature to 85°C, add 20mL of 15% NaOH solution dropwise, control the temperature not higher than 95°C, and stir at a low speed 1h, keep warm at 93°C±2°C, let stand for 2h, then add 9.9mL of 15% NaOH solution dropwise to prepare granular catalyst (c). The change of aluminum content was measured, and the removal rate of aluminum was calculated to be 13%. Fill 2mL of catalyst (c) in a fixed bed with an inner diameter of 10mm and a length of 4cm. For ethylene glycol with a mass concentration of 85%, the bed temperature is 73°C, the hydrogen pressure is 0.25MPa, and the space velocity is 35h -1 Catalyzed hydrogenation under the conditions, hydrogenation reaction liquid rectification collects ethylene glycol fraction, obtains ethylene glycol product, and the ultraviolet light transmittance comparison of input material, output material and produ...

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Abstract

The present invention is Ni catalyst prepared with Ni-Al alloy as skeleton and through surface treatment with hot alkali solution to eliminate Al of 8-30 %. The Ni catalyst is used in catalytic hydrogenation of glycol material with low ultraviolet ray transmission rate to raise its ultraviolet ray transmission rate. The Ni catalyst has proper strength suitable for use in fixed bed reactor, high catalytic activity and long service life, and the rectified glycol product has low aldehyde content and high ultraviolet ray transmission rate.

Description

technical field [0001] The invention relates to a catalyst for refining ethylene glycol by catalytic hydrogenation method, which uses a strong base to react with aluminum in amorphous aluminum-nickel alloy at 80-100°C, and the removal rate of aluminum is between 8% and 30%. A nickel catalyst supported by an aluminum-nickel alloy and activated on the surface is prepared, which is used for continuous catalytic hydrogenation of a fixed bed to remove trace organic impurities that affect the ultraviolet transmittance of ethylene glycol. Background technique [0002] Ethylene reacts with oxygen under the action of a silver catalyst to form ethylene oxide. After being absorbed by water, decomposed and absorbed again, the ethylene oxide enters the hydration reactor to react to form ethylene glycol and polyethylene glycol. The reaction liquid undergoes multi-effect evaporation, Ethylene glycol products are obtained through the processes of rectification dehydration, rectification to ...

Claims

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Application Information

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IPC IPC(8): B01J23/835C07C31/20C07C29/10
Inventor 何明阳陈群朱晔张益峰曹玉霞
Owner JIANGSU POLYTECHNIC UNIVERSITY
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