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Preparation method for producing acetaldehyde by catalyzing acetylene with ZAPO molecular sieve

A technology for catalyzing acetylene and acetaldehyde with molecular sieves, applied in the chemical field, can solve problems such as environmental hazards and general efficiency, and achieve the effects of reducing production costs, saving resources, and reducing production costs

Pending Publication Date: 2020-08-25
BOZUN INVESTMENT GRP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In this regard, the present invention proposes a new production process and its catalyst system for the preparation of acetaldehyde by hydration of acetylene, and the catalyst system does not contain mercury, so as to solve the problem that the conventional preparation methods of acetaldehyde on the market currently have a general efficiency and a environmental hazards

Method used

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  • Preparation method for producing acetaldehyde by catalyzing acetylene with ZAPO molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1: in conjunction with the technological process shown in accompanying drawing, acetylene space velocity is 40.5ml / min 3ml catalyst, and the water and acetylene mole ratio in feed gas is 4.5, and the catalyst used for hydration reaction is ZAPO-5 (zinc aluminum phosphate) molecular sieve catalyst , where the molar ratio of Zn in the framework n(Zn):n(P 2 o 5 )=0.3, the temperature of the hydration reactor is 290°C. The composition and content of the acetaldehyde-based product obtained in the examples were determined by gas chromatography to calculate the conversion rate of acetylene and the selectivity of acetaldehyde.

[0033] The conversion rate of acetylene was measured to be 87.5%, and the selectivity of acetaldehyde was about 98%.

Embodiment 2

[0034] Example 2: In conjunction with the process flow shown in the accompanying drawings, the acetylene space velocity is 15.8ml / min·ml catalyst, the molar ratio of water and acetylene in the feed gas is 2.3, and the catalyst used for the hydration reaction is a ZAPO-5 molecular sieve catalyst, wherein Zn is in the framework The content molar ratio n(Zn):n(P 2 o 5 )=0.4, the temperature of the hydration reactor is 290°C. The composition and content of the acetaldehyde-based product obtained in the examples were determined by gas chromatography to calculate the conversion rate of acetylene and the selectivity of acetaldehyde.

[0035] The conversion rate of acetylene was measured to be 94.2%, and the selectivity of acetaldehyde was about 99%.

Embodiment 3

[0036] Embodiment 3: In conjunction with the technical process shown in the accompanying drawings, the space velocity of acetylene is 14.8ml / min·ml catalyst, the molar ratio of water and acetylene in the feed gas is 2.3, and the catalyst used for the hydration reaction is a ZAPO-5 molecular sieve catalyst, wherein Zn is in the framework The content molar ratio n(Zn):n(P 2 o 5 )=0.5, the temperature of the hydration reactor is 290°C. The composition and content of the acetaldehyde-based product obtained in the examples were determined by gas chromatography to calculate the conversion rate of acetylene and the selectivity of acetaldehyde.

[0037] The conversion rate of acetylene was measured to be 93.8%, and the selectivity of acetaldehyde was about 99%.

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Abstract

The invention discloses a preparation method for producing acetaldehyde by catalyzing acetylene with a ZAPO molecular sieve. The method comprises the following steps: preheating feed gas acetylene andwater, carrying out ZAPO molecular sieve catalysis and continuous hydration in a fluidized bed to obtain acetaldehyde, separating, absorbing and rectifying to obtain an acetaldehyde product, and continuously regenerating the catalyst for use. The method is simple, stable and efficient in process, solves the problem of dependence of acetaldehyde production through acetylene hydration on mercury catalysts, avoids harm of mercury to human bodies and the environment, and has high production and use value.

Description

technical field [0001] The invention belongs to the technical field of chemistry, and in particular relates to a preparation method for catalyzing acetylene with ZAPO molecular sieve to produce acetaldehyde. Background technique [0002] Acetaldehyde, also known as acetic aldehyde, belongs to aldehydes, is a chemical compound with molecular formula CH 3 Organic compounds of CHO or MeCHO. Acetaldehyde is considered to be one of the most important compounds among aldehydes due to its widespread occurrence in nature and large-scale industrial production. Acetaldehyde can be found in coffee, bread, ripe fruit, and it can also be produced as a metabolite by plants. Ethanol is oxidized to form acetaldehyde and is believed to be responsible for hangovers. Acetaldehyde is liquid at room temperature, colorless, flammable, and has a pungent smell. Its melting point is -123.5°C and its boiling point is 20.2°C. It can be reduced to ethanol or oxidized to acetic acid. [0003] Acet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/26C07C45/78C07C45/82C07C45/81C07C47/06
CPCC07C45/26C07C45/783C07C45/82C07C45/81C07C45/78C07C47/06Y02P20/584
Inventor 蒋益波应喻凡李政
Owner BOZUN INVESTMENT GRP LTD
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