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Method for joint production of ethanolamine by ammonia water method and liquid ammonia method

A combined production, ethanolamine technology, applied in chemical instruments and methods, preparation of aminohydroxy compounds, preparation of organic compounds, etc., can solve the problems of high catalyst activity, low catalyst activity, low equipment investment, etc. Technical effect, environmental protection effect of process process

Active Publication Date: 2018-06-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The present invention is for the joint production process of the liquid ammonia method and the ammonia water method, in order to save the investment in ammonia recovery and ethanolamine product separation equipment, and in the process of mixing and centralized treatment of the reaction products of the ammonia water method and the liquid ammonia method, a small amount of liquid phase water is entrained at the top of the ammonia recovery tower , circulated into the reaction unit of the liquid ammonia method, resulting in the reduction of catalyst activity and other problems. A new ammonia recovery method in the ethanolamine co-production process is provided. When the method is used for the ammonia recovery in the ethanolamine co-production process, it has low equipment investment. The advantages of high catalyst activity

Method used

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  • Method for joint production of ethanolamine by ammonia water method and liquid ammonia method
  • Method for joint production of ethanolamine by ammonia water method and liquid ammonia method
  • Method for joint production of ethanolamine by ammonia water method and liquid ammonia method

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Experimental program
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Effect test

Embodiment 1

[0043] Such as figure 1 Shown, ethylene oxide feed 1 is divided into two parts, and a part (stream 6) enters R101 after mixing with ammoniacal liquor (stream 20), and reaction product is stream 7, and stream 6 and stream 20 mixing positions are as far as possible away from reactor R101 entrance Probably near, after a part (stream 2) mixes with fresh liquid ammonia (stream 3), stream 22 enters reactor R102, and reaction product (stream 4) enters reactor R103, and after reaction product (stream 5) mixes with stream 7, stream 8 is sent to the ammonia recovery tower T101, and the ammonia recovery tower top gas 14 passes through the high-efficiency gas-liquid separator S101 to separate the entrained liquid droplets (stream 15), and the stream 15 is sent to the reactor R101, and the ammonia gas (stream 16) passes through the ammonia recovery tower After the condenser E101 is condensed, the liquid ammonia is divided into two parts, and the stream 18 and the stream 19 are respectively...

Embodiment 2

[0052] The liquid ammonia method reaction product 1 has an ammonia content of 75% in terms of mass fraction, and also contains monoethanolamine, diethanolamine, triethanolamine and heavy components.

[0053] The reaction product 2 of the ammonia water method has an ammonia content of 65% and a water content of 10% in terms of mass fraction, and also contains monoethanolamine, diethanolamine, triethanolamine and heavy components.

[0054] The theoretical plate number of the ammonia recovery tower is 20, the operating pressure is 1.6MPaG, and the operating temperature is 45°C.

[0055] The operating pressure of the ammonia flash tank is 0.45MPaG, and the operating temperature is 160°C.

[0056] The operating pressure of the dehydration tower is -0.05MPaG, and the operating temperature is 68°C.

[0057] Monoethanolamine product mass fraction ≥ 99.9%, moisture ≤ 0.1%, chroma ≤ 10; diethanolamine product mass fraction ≥ 99.9%, moisture ≤ 0.1%, chroma ≤ 15; triethanolamine product ...

Embodiment 3

[0060] The liquid ammonia method reaction product 1 has an ammonia content of 80% in terms of mass fraction, and also contains monoethanolamine, diethanolamine, triethanolamine and heavy components.

[0061] Ammonia water method reaction product 2, by mass fraction, has an ammonia content of 50%, a water content of 15%, and also contains monoethanolamine, diethanolamine, triethanolamine and heavy components.

[0062] The theoretical plate number of the ammonia recovery tower is 30, the operating pressure is 1.8MPaG, and the operating temperature is 48°C.

[0063] The operating pressure of the ammonia flash tank is 0.65MPaG, and the operating temperature is 170°C.

[0064] The operating pressure of the dehydration tower is 0.15MPaG, and the operating temperature is 75°C.

[0065]Monoethanolamine product mass fraction ≥ 99.9%, moisture ≤ 0.1%, chroma ≤ 10; diethanolamine product mass fraction ≥ 99.9%, moisture ≤ 0.1%, chroma ≤ 15; triethanolamine product mass fraction ≥ 99.5%, ...

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Abstract

The invention provides a method for cooperatively producing ethanolamine. The method aims at achieving the effects that the ammonia recycling rate is high, and equipment investment is saved. According to the method for cooperatively producing the ethanolamine through an ammonium hydroxide method and a liquid ammonia method, an efficient gas-liquid separator is arranged at a gas-phase outlet in the top of an ammonia recycling tower, and the situation that the amount of water carried by a gas phase exceeds the limit, so that catalyst selectivity achieved in an ammonium hydroxide method process is lowered, and the service life is shorted is prevented. By means of the method, low-temperature refrigerant does not need to be adopted; no compressor is needed; equipment investment is saved; the ammonia recycling rate is high; product quality is high; and the method can be applied to industrial production of the ethanolamine and is particularly suitable for transformation and expanding production conducted through the ammonium hydroxide method process.

Description

technical field [0001] The invention relates to the field of ethanolamine production, in particular to a method for jointly producing ethanolamine by an ammonia water method and a liquid ammonia method. Background technique [0002] Ethanolamine is an important derivative of ethylene oxide, which includes three alcoholamine compounds: monoethanolamine (MEA), diethanolamine (DEA), and triethanolamine (TEA). It is an important fine organic chemical raw material, which is widely used in the fields of gas purification, printing and dyeing, medicine, pesticide, polyurethane and rubber additives. The output accounts for about 90% of the total output of amino alcohol. There are nitrogen atoms and hydroxyl groups in the ethanolamine molecule, so it has the chemical properties of both amine and alcohol. In China, ethanolamine is mainly used in the fields of surfactants, pesticides and polyurethanes. Among them, the field of surfactants and insecticides is the largest consumption f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C213/04C07C215/12C07C215/08
CPCC07C213/04C07C215/12C07C215/08
Inventor 胡松杨卫胜
Owner CHINA PETROLEUM & CHEM CORP