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Method for producing high-carbon primary alcohols by catalytic conversion of ethanol

A technology of catalytic conversion and carbon primary alcohol, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of reduced product selectivity, low ethanol conversion rate, easy metal agglomeration, etc., and achieves good economical efficiency. The effect of stability and practicability, good stability, and easy preparation

Inactive Publication Date: 2016-06-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Under the current catalyst system, the conversion rate of ethanol in this reaction is low, and its dehydrogenation rate is slow, which affects the progress of subsequent reactions.
At the same time, ethanol is prone to intramolecular or intermolecular dehydration to generate ethylene or ether, thereby reducing the selectivity of the product
In addition, metals are easy to agglomerate and grow up during the reaction, which will cause catalyst deactivation.

Method used

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  • Method for producing high-carbon primary alcohols by catalytic conversion of ethanol
  • Method for producing high-carbon primary alcohols by catalytic conversion of ethanol
  • Method for producing high-carbon primary alcohols by catalytic conversion of ethanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Catalyst preparation

[0025] Weigh 0.04mol nitrate M (M is one or more of Ni and Co, Cu, Zn) and 0.08mol magnesium nitrate (Mg(NO 3 ) 2 ·6H 2 O), 0.02mol aluminum nitrate (Al(NO 3 ) 3 9H 2 O) was dissolved in 100mL deionized water to make solution A. Another weighed 0.12mol anhydrous sodium carbonate (Na 2 CO 3 ) was dissolved in 60mL of deionized water and mixed with 20mL of 3M NaOH solution to obtain solution B. Solution B was placed in a 35°C water bath, and solution A was added to it at a rate of 3 mL / min under vigorous stirring, and a small amount of NaOH solution was added to adjust the pH to 10. The precipitate was crystallized in a 65°C water bath for 18h. After filtering and washing, the samples were dried at 80°C.

Embodiment 2

[0030] The catalytic conversion experiment was carried out in a fixed-bed reactor, and the specific conditions were as follows: 2 g of the catalyst precursor prepared in Example 1 was added to the fixed-bed reactor, and hydrogen was reduced online at a hydrogen flow rate of 60 ml / min and a reduction temperature of 600 ° C. , restore event 2h.

[0031] After reduction, the temperature was lowered, and nitrogen gas was introduced at a pressure of 3 MPa and a gas flow rate of 20 ml / min. Rise to the reaction temperature and pump the raw materials into the reaction, and the liquid phase product and gas phase product are analyzed by gas chromatography respectively.

Embodiment 3

[0033] The different catalysts prepared by comparative example 1 and embodiment 1, the result of preparing even-carbon alcohols by the catalytic conversion of ethanol under the conditions of embodiment 2:

[0034] Table 1 The reaction results of ethanol catalytic conversion under different catalysts to prepare even carbon alcohols (ethanol concentration 98wt%, feed rate 0.1ml / min, atmosphere is argon, reaction temperature 250 ℃, catalyst quality 2.2g)

[0035]

[0036]

[0037] It can be seen from the reaction data that compared with the catalyst prepared by the impregnation method, the Ni, Cu, and Co catalysts prepared by the co-precipitation method showed a high conversion rate and selectivity in the conversion of ethanol, and the yield of even-carbon alcohol exceeded 60%.

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Abstract

The present invention provides a method for producing high-carbon primary alcohols by catalytic conversion of ethanol. Even-number-carbon primary alcohols are prepared in a fixed bed by catalytic conversion of ethanol by use of transition metal-compound oxide as a catalyst prepared by co-precipitation method. Compared with the prior art, a raw material used in the method is bio-ethanol, the bio-ethanol has the advantages of being rich in reserves, environmentally friendly, green, pollution-free and the like, the prepared even-number-carbon primary alcohols include butanol, hexanol and octanol, and have the advantages of being highly-economical, wide in use ways, and the like. In addition, in the process, the catalyst is low in price, the reaction selectivity is high, stability is good, products are easy to separate, and the method has important economic value and potential industrial prospects.

Description

technical field [0001] The invention relates to the technical field of bioenergy development, in particular to a method for preparing high-carbon primary alcohols through catalytic conversion of ethanol. Background technique [0002] With the depletion of fossil fuels, the aggravation of environmental pollution and the rapid development of fermentation technology, ethanol as a new energy chemical platform compound has attracted widespread attention. By 2010, the production of ethanol reached 60 billion liters. At present, most of ethanol is mainly used for adding oil products, thereby partially replacing fuel oil. However, based on the limitation of safety and solvent compatibility, the amount of ethanol added in oil products is limited, only less than 10%, which seriously restricts the development and application of ethanol. [0003] Correspondingly, high-carbon alcohols such as butanol have a higher addition ratio, and do not affect the normal operation of existing engin...

Claims

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Application Information

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IPC IPC(8): C07C31/12C07C31/125C07C29/34B01J23/755B01J23/72B01J23/75B01J23/06
Inventor 庞纪峰郑明远姜宇王爱琴王晓东张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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