Technical method of dehydrogenating alcohols

A process method and dehydrogenation technology, applied in the direction of chemical instruments and methods, preparation of organic compounds, carbon-based compounds, etc., can solve the problems of low selectivity, carbon deposition deactivation, high catalyst price, etc., and achieve low temperature and high temperature Selective, the effect of using mission length

Inactive Publication Date: 2004-09-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dehydrogenation reaction temperature is between 200-300°C, although the conversion rate of alcohol can reach more than 80%, but the selectivity of the target product ketone is low, between 90%-95%, there is still room for improvement
And this type of catalyst is gradually deactivated by carbon deposition during use, requiring repeated carbon burning to regenerate
[0006] There are also patents introducing the use of more active palladium, rhodium and other precious metals loaded on α-Al 2 o 3 As an alcohol dehydrogenation catalyst, as introduced in US Patent 3981923, Pt / α-Al containing 0.25w% platinum is used 2 o 3 As a catalyst for alcohol dehydrogenation, there are also the disadvantages of the above catalysts, and the price of the catalyst is also high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Make a nanometer copper powder (average particle diameter is 6nm) catalyst 10.0g and pack in a 500ml three-necked flask by the above-mentioned disclosed method of patent, add 350ml molecular weight and be the polyisobutylene of 2000. The flask is equipped with an electric stirring device and an electric heating jacket as a dehydrogenation reaction kettle. One mouth of the reaction kettle is equipped with a glass inlet pipe, which is inserted to the bottom of the flask and connected to a gas distributor. The distributor has micropores to determine the size of the micropores. and distribution so that the feed gas enters and distributes evenly with very fine bubbles; the feed distributor is at the bottom of the flask and prevents it from colliding with the stirring fins; the gas inlet is connected to an electric heating tube as a feed heater, The electric heating tube is connected with a glass tee, and one end of the tee is connected with a 250ml two-necked flask equipped w...

Embodiment 2

[0030] Use the same equipment of embodiment 1, take the same operation process, 10.0g nano-copper-zinc alloy (containing 50w% of zinc, copper-zinc average particle diameter is 15nm) powder is packed in reactor, adds No. 50 refining white wax of 350ml, After catalyst reduction according to the operation process of Example 1, the temperature of the reactor was heated to 150° C., and isopropanol was charged at 30 g / h to carry out the test of preparing acetone by dehydrogenation of isopropanol. The liquid product contained 37.6w% of acetone through gas chromatography analysis. , 62.2w% isopropanol.

Embodiment 3

[0032]The powder of the reduced state of 10g nano-nickel (average particle diameter is 10nm) of preparation is sealed in 100ml polyethylene glycol-5000, uses the same equipment of embodiment 1, under guaranteeing that nano-nickel completely isolates the air state, packs reaction In the kettle, add 250ml of polyethylene glycol-5000, the system feeds hydrogen to replace the air in it, the reactor keeps stirring and it is heated to 200°C, the feed heater also heats the feed to 200°C, and the vaporizer is heated to At 150°C, feed cyclohexanol at 10 g / h to prepare cyclohexanone by dehydrogenating cyclohexanol. The liquid product contained 34.2w% cyclohexanone and 65.7w% cyclohexanol through gas chromatography analysis.

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Abstract

A process for dehydrogenating alcohols features that after the dehydrogenating catalyst whose active component is nano-class metal component is loaded in reactor, the dehydrogenating reaction on raw alcohol takes place to generate aldehyde and ketone whose number of C atoms isequal to that of alcohol. Its advantages are high selectivity, low reaction temp and long service life of catalyst.

Description

1. Technical field [0001] The invention relates to a process for catalytic dehydrogenation of alcohols, in particular to a process for the dehydrogenation of low-carbon alcohols such as C1-C10. 2. Background technology [0002] Alcohol dehydrogenation is a main method to prepare aldehydes and ketones, such as ethanol dehydrogenation to acetaldehyde, isopropanol to acetone, sec-butanol to methyl ethyl ketone, cyclohexanol to cyclohexanone, n-octyl Alcohol dehydrogenation to produce octanal, etc. [0003] Copper, zinc, nickel, platinum, palladium, rhodium and other metals or their alloys have good catalytic activity and high product selectivity for the dehydrogenation of alcohols. Because platinum and other precious metals are expensive, copper or brass alloys are mainly used as catalyst. In the past, copper or brass in the shape of particles, nets, fibers, etc. was used as a catalyst for catalytic dehydrogenation. However, due to the small active surface area per unit mass ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/00
Inventor 马友山苏杰乔凯商震
Owner CHINA PETROLEUM & CHEM CORP
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