Method for preparing ethylene diamine from ethanolamine and ammonia serving as raw materials under hydrogen condition

A technology of ethanolamine and ethylenediamine, applied in the field of hydroxyethylpiperazine and hydroxyethylethylenediamine, aminoethylpiperazine, piperazine, and co-production of diethylenetriamine, can solve the problem of high energy consumption and equipment corrosion serious problems, to achieve the effect of improving selectivity, reducing reaction pressure and energy consumption

Inactive Publication Date: 2010-05-12
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, many domestic manufacturers adopt the EDC method. This method produces a large amount of sodium chloride by-products. The e...

Method used

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  • Method for preparing ethylene diamine from ethanolamine and ammonia serving as raw materials under hydrogen condition

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The catalyst used is Ni-Re-B / Al 2 o 3 . The weight composition of the catalyst is: Ni=15%, Re=1.6%, B=1.2%, and the rest is carrier Al 2 o 3 . The carrier adopts commercial Al 2 o 3 , and the catalyst active component Ni and additives Re and B were loaded on the carrier Al by conventional impregnation method 2 o 3 (Al 2 o 3 The particle size is 20-40 mesh). 8.0 grams (about 10ml) of the catalyst was activated by hydrogen before the reaction, and the activation conditions were: GHSV=2400h -1 , Atmospheric pressure, 375°C, reduction time 5 hours. Choose a fixed bed reactor. The reaction temperature is 155°C, the hydrogen pressure is 8.0MPa, the ammonia / ethanolamine molar ratio is 10, and the H 2 / ethanolamine molar ratio is 0.015 ethanolamine liquid space velocity is 0.5h -1 , the reaction time is 50h, sampling analysis. Samples were analyzed by gas chromatography, HP-15 capillary column, and FID detector. Dimethylformamide (DMFA) was used as internal stan...

Embodiment 2

[0020] The liquid space velocity of ethanolamine is 0.3h -1 , other conditions are identical with embodiment 1.

Embodiment 3

[0022] The liquid space velocity of ethanolamine is 0.7h -1 , other conditions are identical with embodiment 1.

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Abstract

The invention discloses a method for preparing ethylene diamine from ethanolamine and ammonia serving as raw materials under a hydrogen condition. A reaction system consists of the ethanolamine, the ammonia, hydrogen and a catalyst, wherein the reaction temperature is 100 to 190 DEG C, the reaction pressure is 6.0 to 25.0MPa, the molar ratio of the ammonia to the ethanolamine is 1-20 and the molar ratio of the H2 to the ethanolamine is 0.008-0.05, and the air speed of the ethanolamine liquid is 0.1 to 1.5h-1; the catalyst takes Al2O3 or SiO2 as a carrier and one or more of Ru, Ni, Pd, B, Fe, Co, Re and Cu as carried active components; and the ethanolamine and the liquid ammonia can be transformed into the ethylene diamine (EDA) in high activity and high selectivity, along with by products such as diethylenetriamine (DETA), a piperazine (PIP), an aminoethylpipe (AEP), a hydroxyethylpiperazine (HEP), a hydroxyethyl ethylene diamine (AEEA) and the like under the hydrogen condition and the action of the catalyst.

Description

technical field [0001] The invention relates to a method for preparing ethylenediamine by using ethanolamine and ammonia as raw materials under hydrogen-facing conditions. Specifically, it is mainly used to convert ethanolamine and ammonia into ethylenediamine (EDA) under hydrogen-facing conditions. Parallel production of diethylenetriamine (DETA), piperazine (PIP), aminoethylpiperazine (AEP), hydroxyethylpiperazine (HEP) and hydroxyethylethylenediamine (AEEA), etc. Background technique [0002] Ethyleneamine series products include ethylenediamine, diethylenetriamine, triethylenetetramine and polyethylenepolyamine, among which ethylenediamine is the most important chemical raw material in the market. It is used in epoxy resin curing agent, Pesticides, polymers and other fields have a wide range of uses. There are two main preparation methods for ethylenediamine, one is the dichloroethane method (EDC); the other is the monoethanolamine (MEA) method. Each has advantages and...

Claims

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Application Information

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IPC IPC(8): C07C211/10C07C209/16B01J23/889
Inventor 丁云杰严丽吕元马立新
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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