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A method for adjusting the activity selectivity of benzene selective hydrogenation to cyclohexene using ru-zn catalyst

A technology for selective hydrogenation and catalyst, applied in the field of chemical industry, can solve problems such as dependence on imports, and achieve the effect of low cost and good modulation effect

Active Publication Date: 2017-05-24
西藏润景科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem faced by the existing technology is that zinc hydroxide for modulation generally relies on imports, so it is necessary to study new modulation methods to provide technical support for Chinese enterprises to get rid of their dependence on foreign countries

Method used

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  • A method for adjusting the activity selectivity of benzene selective hydrogenation to cyclohexene using ru-zn catalyst
  • A method for adjusting the activity selectivity of benzene selective hydrogenation to cyclohexene using ru-zn catalyst
  • A method for adjusting the activity selectivity of benzene selective hydrogenation to cyclohexene using ru-zn catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~5

[0017] Embodiment 1~5--Adopt NaOH modulation

[0018] In the reaction slurry containing 2g Ru-Zn catalyst and 280ml 0.47mol / L zinc sulfate, add 0mg, 39.5mg, 79mg, 118.5mg, 158mg NaOH respectively, the reaction slurry pH is all between 5.5~6.0; Then this reaction Put the slurry into a PTFE-lined 1L autoclave, first replace the air in the autoclave with hydrogen, then fill it with hydrogen to a pressure of 5MPa, control the stirring speed at 800r / min, raise the temperature to 150°C, feed 140ml of benzene, and simultaneously When the rotating speed is raised to 1400r / min, start timing, take samples at intervals of 5 minutes, use gas chromatography to analyze product composition, FID detector, and area correction normalization method to calculate the relative content of cyclohexane, cyclohexene and benzene, and calculate the relative content of benzene at different times Conversion rate C BZ , Cyclohexene selectivity S HE and yield Y HE . Benzene conversion C BZ , cyclohexene...

Embodiment 6~12

[0023] Embodiment 6~12--Adopt basic formula zinc sulfate modulation

[0024] In the reaction slurry containing 2g Ru-Zn catalyst and 280ml 0.47mol / L zinc sulfate, add 0mg, 75mg, 150mg, 225.5mg, 300mg, 375mg, 450mg basic zinc sulfate 3Zn(OH) 2· ZnSO 4 ·3H 2 The colloidal solution of O (based on the mass equivalent to basic zinc sulfate BSS), the pH of the reaction slurry is between 5.1 and 6.2; the follow-up operations are the same as in Examples 1 to 5.

[0025] figure 2 The change law of catalyst activity and selectivity is given by adding different amounts of basic zinc sulfate BSS, where (a) the conversion rate of benzene after adding different amounts of basic zinc sulfate BSS C BZ The change curve of % with time T, (b) is the cyclohexene selectivity S after adding different amounts of basic zinc sulfate BSS HE % with benzene conversion rate C BZ % change curve. 0mg BSS was a blank test, and in 7 different embodiments, keeping other conditions constant, the modulati...

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Abstract

The present invention belongs to the technical field of chemistry and chemical industry, and particularly relates to an activity selectivity modulating method of a Ru-Zn catalyst for cyclohexene production through benzene selective hydrogenation. According to the present invention, when the main technical index benzene conversion rate of the catalyst is higher than 40% and the main technical index cyclohexene selectivity is lower than 80%, a colloid solution of sodium hydroxide or basic zinc sulfate is added to the reaction slurry to control the pH value of the reaction slurry to 5-7; and the method has the following advantages that the modulating effect is good, and the chemicals for modulating are cheap and easily-available, have low cost, and can completely replace the imported zinc hydroxide.

Description

technical field [0001] The invention belongs to the technical field of chemistry and chemical engineering, and in particular relates to a method for adjusting the activity selectivity of a Ru-Zn catalyst used in the selective hydrogenation of benzene to cyclohexene. Background technique [0002] Cyclohexene is widely used in the production of bulk chemicals such as cyclohexanone, adipic acid, nylon 6, nylon 66, and polyurethane. Among them, nylon 6 and nylon 66 are related to the national economy and the people's livelihood, and play an important role in the development of the national economy. Benzene is selectively hydrogenated to cyclohexene to produce cyclohexanone, adipic acid, nylon 6, nylon 66, etc. Compared with the traditional route, it fundamentally eliminates potential safety hazards. The by-product is only cyclohexane and can be fully utilized. The atom utilization rate is 100%, which has a high atom economy, and consumes one-third less hydrogen, high water reus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C5/11C07C13/20
Inventor 刘仲毅李中军刘寿长刘国际陈恩之赵风轩乔华勇姜曦
Owner 西藏润景科技有限公司