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Catalyst for preparing gamma-butyrolactone by normal pressure gas phase hydrogenation of maleic-anhydride and preparation process thereof

A technology of catalyst and maleic anhydride, which is applied in the field of catalyst and its preparation, can solve the problems that the catalyst contains the toxic component Cr element, the selectivity of γ-butyrolactone is not high, and the space velocity of the raw material is small, so as to achieve excellent catalytic performance and high High selectivity and high yield per pass

Inactive Publication Date: 2005-09-21
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] Although the above-mentioned existing patented technologies have their own characteristics, they also have their own shortcomings, such as: the reaction temperature is higher, the space velocity of the raw material is smaller, the selectivity of gamma-butyrolactone is not high, and the catalyst contains the toxic component Cr elements etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] According to the composition ratio (wt%) of the catalyst (CuO 12%, TiO 2 25%, Al 2 o 3 60%, BaO 3%), 3.64 grams of Cu (NO 3 ) 2 ·3H 2 O, 10.7ml n-butyl titanate, 44.1 grams of Al(NO 3 ) 3 9H 2 O, 0.5 g Ba(NO 3 ) 2 Dissolve in 250ml of absolute ethanol, slowly add saturated aqueous sodium carbonate solution dropwise at 40°C under high-speed stirring, and control the final pH value of the solution at 8-9. After the precipitation process, it was aged for 6 hours, then filtered, washed, dried at 120°C for 12 hours, calcined at 550°C for 7 hours, and finally pressed into tablets for use.

[0050] Pack 6ml of 20-40 mesh catalyst into a Φ10mm fixed bed reactor, and then feed 8% H at 300°C 2 / N 2 The mixed gas undergoes in-situ reduction and activation until no water vapor is produced at the outlet of the reactor.

[0051] At a reaction temperature of 180-270°C, normal pressure, and a maleic anhydride liquid hourly space velocity of 0.4h -1 , under the condition ...

Embodiment 2

[0053] According to the composition ratio (wt%) of the catalyst (CuO 12%, TiO 2 25%, Al 2 o 3 60%, BaO 3%), 3.64 grams of Cu (NO 3 ) 2 ·3H 2 O, 12.6 g Ti(SO 4 ) 2 9H 2 O, 44.1 g Al(NO 3 ) 3 9H 2 O, 0.5 g Ba(NO 3 ) 2 Dissolve in 180ml of deionized water, add 1100ml of cyclohexane, 150ml of triton and 180ml of n-hexanol in sequence under vigorous stirring to form a nearly transparent and stable salt microemulsion. Then use the same method to prepare the microemulsion of alkaline precipitant sodium carbonate. Slowly add the sodium carbonate microemulsion into the salt microemulsion at 40° C. under vigorous stirring, and control the final pH value of the solution at 8-9. After the precipitation process, it was aged for 12 hours, then filtered, washed, dried at 120°C for 12 hours, calcined at 550°C for 7 hours, and finally pressed into tablets for use.

[0054] All the other conditions are the same as in Example 1, and both the maleic anhydride conversion rate and t...

Embodiment 3

[0056] According to the composition ratio (wt%) of the catalyst (CuO 50%, TiO 2 15%, Al 2 o 3 34%, La 2 o 3 1%), 15.2 grams of Cu(NO 3 ) 2 ·3H 2 O, 6.4ml n-butyl titanate, 25.0 grams of Al(NO 3 ) 3 9H 2 O, 0.3 g La(NO 3 ) 3 ·6H 2 O was dissolved in 250ml of absolute ethanol, and saturated sodium carbonate aqueous solution was slowly added dropwise at 40°C under high-speed stirring to control the final pH value of the solution at 8-9. After the precipitation process, it was aged for 6 hours, then filtered, washed, dried at 120°C for 12 hours, calcined at 550°C for 7 hours, and finally pressed into tablets for use.

[0057] All the other conditions are the same as in Example 1, the conversion rate of maleic anhydride is greater than 95%, and the selectivity of gamma-butyrolactone is greater than 90%.

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Abstract

The invention discloses a method for preparing a catalyst, which is used in making the gamma-butyrolactone with sym-form anhydride and hydrogen in normal temperature. The catalyst is made up of CuO, TiO2, Al2O3 and adjuvant, and can be prepared through coprecipitation or microemulsion. The catalyst does not have the toxic component Cr and belongs to the environment-friendly type, and it has high sym-form anhydride conversion rate and gamma-butyrolactone selective in high liquid hourly space velocity, which can reach to 100% individually, that is to say, the gamma-butyrolactone selective can remain 100% when the catalytic activity declining, and the gamma-butyrolactone has high monochromatic absorptivity.

Description

technical field [0001] The invention relates to a catalyst for producing γ-butyrolactone by atmospheric pressure gas-phase hydrogenation of maleic anhydride and a preparation method thereof, specifically, a catalyst containing Cu, Ti, Al and Mg, Ba, Zn, Sn, La, Ni Catalyst for producing gamma-butyrolactone by maleic anhydride gas-phase hydrogenation at normal pressure mixed with at least one of the six elements. Background technique [0002] γ-Butyrolactone (γ-Butyrolactone, referred to as GBL), is a colorless oily liquid, has the characteristics of good stability, strong solubility, good conductivity, safe use, etc., and is an excellent high-boiling organic solvent . GBL can undergo a series of ring-opening or non-ring-opening chemical reactions. It is an important organic chemical raw material and fine chemical intermediate, and can be used to synthesize many important high value-added derivative products, such as pyrrolidone, N-methylpyrrolidone, Important organic chemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72C07D307/33
Inventor 郭杨龙卢冠忠王雨勃郭耘王筠松张志刚刘晓晖
Owner EAST CHINA UNIV OF SCI & TECH
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