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Method for preparing acetaldehyde by ethylene glycol through dehydration

A technology of ethylene glycol and acetaldehyde, which is applied in the chemical industry, can solve problems such as high prices and rising prices of industrial ethylene, and achieve the effects of reducing equipment corrosion, pollution-free environment, and easy recycling

Inactive Publication Date: 2018-05-18
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the traditional industry, acetaldehyde is mainly produced by direct oxidation of ethylene. Ethylene and oxygen pass through a catalyst containing palladium chloride, copper chloride, hydrochloric acid and water to directly oxidize crude acetaldehyde in one step, and then obtain the finished product through distillation. The lack of resources, the continuous reduction of oil production capacity, the price is bound to become higher and higher, and the price of industrial ethylene will also continue to rise, and combined with my country's energy structure with more coal and less oil, so make full use of coal resources and develop a coal-based raw material The production of acetaldehyde has a good application prospect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Using the equivalent impregnation method, the activated carbon was impregnated with ammonium phosphate, dried at 100 °C for 12 h, and then calcined at 450 °C for 4 h to obtain H with a loading capacity of 7 wt %. 3 PO 4 / AC Catalyst.

[0021] Loaded with 7 wt % H 3 PO 4 / AC catalyst was activated at 250°C for 2h.

[0022] In the fixed bed reactor, ethylene glycol is used as the raw material, and the mass space velocity is controlled at 1h -1 , the reaction temperature is 210 °C, under this condition, the ethylene glycol and the activated loading of 7% H 3 PO 4 / AC catalyst for 12 h to obtain acetaldehyde.

[0023] Reaction result: the average conversion rate of ethylene glycol is 73%, and the average selectivity of acetaldehyde is 53%.

Embodiment 2

[0025] Using the equal impregnation method, the activated carbon was impregnated with ammonium phosphate, dried at 80 °C for 24 h, and then calcined at 300 °C for 4 h to obtain (NH 4 ) 3 PO 4 / AC Catalyst.

[0026] With a loading of 1 wt % (NH 4 ) 3 PO 4 / AC catalyst was activated at 300°C for 1h.

[0027] In the fixed bed reactor, ethylene glycol is used as the raw material, and the mass space velocity is controlled at 0.3h -1 , the reaction temperature is 270 ° C, under this condition, ethylene glycol and activated loading of 1% (NH 4 ) 3 PO 4 / AC catalyst for 12 h to obtain acetaldehyde.

[0028] Reaction result: the average conversion rate of ethylene glycol is 80%, and the selectivity of acetaldehyde is 54%.

Embodiment 3

[0030] Using the super impregnation method, the activated carbon was impregnated with ammonium phosphate, dried at 150 °C for 1 h, and then calcined at 500 °C for 4 h to obtain (NH 4 ) 3 PO 4 / AC Catalyst.

[0031] With a loading of 25 wt % (NH 4 ) 3 PO 4 / AC catalyst was activated at 300°C for 2h.

[0032] In the fixed bed reactor, ethylene glycol is used as the raw material, and the mass space velocity is controlled at 2h -1 , the reaction temperature is 270 ° C, under this condition, the ethylene glycol and the activated loading of 25% (NH 4 ) 3 PO 4 / AC catalyst for 12 h to obtain acetaldehyde.

[0033] Reaction result: the average conversion rate of ethylene glycol is 99%, and the selectivity of acetaldehyde is 98%.

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Abstract

The invention discloses a method for preparing acetaldehyde by ethylene glycol through dehydration, and belongs to the technical field of chemical industries. The method includes the steps: taking active carbon as a carrier, taking phosphoric acid, sulfuric acid or sulfate and sulfate as active components, soaking the active carbon by the aid of the active component, and drying and roasting the soaked active carbon to obtain a supported catalyst; performing activating treatment on the supported catalyst to obtain an activated supported catalyst; performing dehydration reaction on ethylene glycol by aid of a fixed bed reactor filled with the supported catalyst under a certain condition to obtain the acetaldehyde. According to the method, the catalyst is simple and convenient to prepare, high in activity and good in stability and can still keep good activity after repeatedly being used, the conversion rate of the ethylene glycol ranges from 70% to 99%, and the selectivity of the acetaldehyde ranges from 50% to 98%.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to the preparation technology of acetaldehyde. technical background [0002] Acetaldehyde, molecular formula C 2 h 4 O, relative molecular mass is 44.05, colorless liquid, soluble in organic solvents such as water and ethanol, boiling point 21°C, relative density 0.804~0.811, refractive index 1.3316. Acetaldehyde has very important industrial application value. In organic synthesis, acetaldehyde is a two-carbon reagent and an electrophile. It is regarded as CH 3 A synthon of CH(OH), with protochirality. In Strecker's amino acid synthesis, alanine can be synthesized after condensation and hydrolysis of acetaldehyde with cyanide ion and ammonia. Acetaldehyde can also construct a heterocyclic ring system, such as the reaction of paraldehyde and ammonia to generate pyridine derivatives. In addition, acetaldehyde can be used to make acetic acid, ethanol, ethyl ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/52C07C47/06B01J27/053B01J27/16B01J27/02B01J37/02B01J37/08
CPCC07C45/52B01J27/02B01J27/053B01J27/16B01J37/0201B01J37/08C07C47/06
Inventor 菅盘铭吴发明
Owner YANGZHOU UNIV
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