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Method for preparing aldehyde or hemiacetal by alcohol dehydrogenation

A hemiacetal and dehydrogenation technology, applied in the field of chemical production, can solve the problems of increasing the production cost of glyphosate, the odor of paraformaldehyde, and the complicated process, so as to control the production cost of the process, and solve the problem of low conversion rate and selectivity. , the effect of reducing pollution

Inactive Publication Date: 2018-04-20
郑州智谷工业技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of obtaining the hemiacetal methanol solution in the traditional process, the process is circuitous and complicated. The hemiacetal methanol solution needs to be obtained from formaldehyde after polymerization, depolymerization, and then reaction with methanol, which increases the production cost of glyphosate, and in production Paraformaldehyde has a serious odor and causes serious environmental pollution problems

Method used

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  • Method for preparing aldehyde or hemiacetal by alcohol dehydrogenation
  • Method for preparing aldehyde or hemiacetal by alcohol dehydrogenation
  • Method for preparing aldehyde or hemiacetal by alcohol dehydrogenation

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Embodiment 1

[0038] see Figure 1-4 , the present invention provides the following technical solutions:

[0039] A kind of method utilizing alcohol dehydrogenation to prepare aldehyde, this method comprises the following steps:

[0040] A, the mixture of production raw material n-butanol, isobutanol, sec-butanol, tert-butanol, alkenol and dehydrogenation catalyst are added in the dehydrogenation reactor in a weight ratio of 7:1;

[0041] B. Preparation of a dehydrogenation catalyst for the dehydrogenation of 3-methanol piperidine (3-MPIP) in a tubular reactor with an inner diameter of 26 mm by impregnating a ZrO extrudate with a Pd(NO3)2 solution To obtain the activity of 3-methanolpyridine (3-PIC), first take 50ml of catalyst material, and activate it in 20% volume hydrogen at 80°C in N2 atmosphere for 4 hours, and then activate it in pure hydrogen at 200°C for 3 hours;

[0042] C. Start metering 3-MPIP, feed 30-120ml / h production raw materials into the evaporator, and completely gasify...

Embodiment 2

[0055] see Figure 1-4 , the present invention provides the following technical solutions:

[0056] A kind of method utilizing alcohol dehydrogenation to prepare aldehyde, this method comprises the following steps:

[0057] A, the mixture of production raw material n-butanol, isobutanol, sec-butanol, tert-butanol, alkenol and dehydrogenation catalyst are added in the dehydrogenation reactor in a weight ratio of 7:1;

[0058] B. Preparation of a dehydrogenation catalyst for the dehydrogenation of 3-methanol piperidine (3-MPIP) in a tubular reactor with an internal diameter of 1.3 m by impregnating a ZrO extrudate with a Pd(NO3)2 solution For the activity of hydrogen into 3-methanolpyridine (3-PIC), first take 50ml of catalyst material, and activate it in 20% volume hydrogen at 80°C in N2 atmosphere for 6 hours, and then activate it in pure hydrogen at 200°C for 4 hours;

[0059] C. Start metering 3-MPIP, feed 30-120ml / h raw material into the evaporator, and completely vaporiz...

Embodiment 3

[0072] see Figure 1-4 , the present invention provides the following technical solutions:

[0073] A kind of method utilizing alcohol dehydrogenation to prepare aldehyde, this method comprises the following steps:

[0074] A, the mixture of production raw material n-butanol, isobutanol, sec-butanol, tert-butanol, alkenol and dehydrogenation catalyst are added in the dehydrogenation reactor in a weight ratio of 7:1;

[0075] B. Preparation of a dehydrogenation catalyst for 3-methanolpiperidine (3 -MPIP) dehydrogenation into 3-methanolpyridine (3-PIC) activity, first take 50ml of catalyst material, and activate T1 hour in 20% volume hydrogen at 80°C in N2 atmosphere, then activate T2 in pure hydrogen at 200°C Hours; the inner diameter of the tubular reactor is positively correlated with the activation time; in order to improve the production efficiency, the activation time T1 (in hours) at 80°C in 20% volume hydrogen in N2 atmosphere, the activation time in pure hydrogen at 2...

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Abstract

The invention discloses a method for preparing preparing aldehyde or hemiacetal by alcohol dehydrogenation, which improves the dehydrogenation production efficiency of the traditional process on the whole, solves the catalyst problem and process condition and operational problem, and improves the defects that low percent conversion and low selectivity commonly exist. Furthermore, the preparation method of the hemiacetal provided by the invention improves the effective utilization rate of raw materials, the process production cost is also controlled, and the pollution is reduced.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a method for preparing aldehyde or hemiacetal by dehydrogenating alcohol. Background technique [0002] Aldehydes can be produced by the catalytic dehydrogenation of alcohols. On an industrial scale, dehydrogenation is carried out over silver or copper catalysts and oxidative dehydrogenation in the presence of silver catalysts and oxygen. The dehydrogenation is carried out at a temperature of 270-300° C., for example in the presence of a copper catalyst activated by Zn, Co or Cr. At an ethanol conversion rate of 30-50%, the acetaldehyde selectivity achieved is 90-95%, and the by-products formed are ethyl acetate, crotonaldehyde, higher alcohols and ethylene. In the case of oxidative dehydrogenation in the presence of air or oxygen, the simultaneous combustion of the hydrogen formed provides the required heat of dehydrogenation. Industrially, oxidative dehydrogenati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C47/02C07C47/21C07C47/22C07C45/00C07C43/30C07C41/50B01J23/42B01J23/44
CPCB01J23/42B01J23/44C07C41/50C07C45/002C07C47/02C07C47/21C07C47/22C07C43/30
Inventor 燕高飞
Owner 郑州智谷工业技术有限公司
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