Method for preparing monoisopropanolamine by virtue of reactive rectification

A technology of isopropanolamine and reactive distillation, applied in chemical instruments and methods, preparation of organic compounds, sustainable manufacturing/processing, etc., can solve the problem of high molar ratio of ammonia ring to feed ratio and high ratio of triisopropanolamine , a large number of equipment and other problems, to achieve the effect of reducing side reactions, reducing energy consumption, saving equipment costs and operating costs

Active Publication Date: 2015-10-07
HEBEI UNIV OF TECH
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Problems solved by technology

[0006] The purpose of the present invention is to aim at the high ratio of molar ratio of ammonia ring to feed that exists in the traditional monoisopropanolamine production process, the huge energy consumption produced in the deamination and dehydration process, various equipment and high proportion of triisopropanolamine in the product Insufficient, provide a kind of reactive distillation to prepare the production technique of monoisopropanolamine, this technique will react and separate and synthesize one step, while reducing the energy consumption in the traditional technique, dwindled the ammonia ring molar ratio (0.8-2.0), Improve product selectivity, the reaction product is monoisopropanolamine, a small amount of diisopropanolamine, and does not generate triisopropanolamine

Method used

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  • Method for preparing monoisopropanolamine by virtue of reactive rectification

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Embodiment 1

[0029]Reactive distillation tower 1 is a sieve tray tower with 25 actual plates, and its operating pressure is 1.2MPa, which is used to ensure that the press is in a liquid phase state and an effective reaction phase state. mining. The temperature at the top of the tower is controlled at about 35°C, and the temperature at the bottom of the tower is 204-205°C. Water at 25°C enters from the first block of the reactive distillation column 1, and the feed flow rate is 400kg / h. Propylene oxide at 25°C enters from the second plate with a feed flow rate of 1160kg / h. Liquid ammonia enters from the 24th plate of the reactive distillation column 1; the feed flow rate is 340kg / h. The molar ratio of liquid ammonia to propylene oxide is 1:1; the condenser 2 in the tower is a total condenser, and the reboiler 3 in the tower is a kettle-type reboiler, and its heat load is 7863kw. The tower top consists of unreacted ammonia and a small amount of water and propylene oxide, and the bottom st...

Embodiment 2

[0033] Reactive distillation tower 1 is a stainless steel θ-ring packed tower with an equal plate height of 40 blocks. The operating pressure is 1.1 MPa, which is used to ensure that the press is in a liquid phase state and an effective reaction phase state. The top of the tower is fully refluxed and the temperature of the tower is controlled. At about 31°C, the temperature of the tower kettle is about 165°C. Water at 25° C. enters from the top of the reactive distillation column 1, and the feed flow rate is 400 kg / h. Propylene oxide at 25°C enters from a position slightly lower than the water feed, and the feed flow rate is 1160kg / h. Liquid ammonia enters from the bottom of the reactive distillation column 1, and the feed flow rate is 510kg / h. The feed molar ratio of ammonia to propylene oxide was 1.5:1. The condenser 2 in the tower is a total condenser, and the reboiler 3 in the tower is a kettle-type reboiler, and its heat load is 7391kw. The top composition includes unr...

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Abstract

The invention provides a method for preparing monoisopropanolamine by virtue of reactive rectification. The method comprises the following steps: feeding liquid ammonia from the lower part of a reactive rectification tower by use of a pressure reducing valve, meanwhile, feeding propylene epoxide from the second tower plate at the upper part of the tower at 25 DEG C, and feeding catalyst water from the top of the tower at a temperature ranging from 15 to 40 DEG C, wherein the feeding molar ratio of the fed ammonia to the propylene epoxide is (0.8-2.0): 1, the feed quantity of the water is 10-50% of the mass percentage of the total feed quantity, and the total feed quantity is the mass sum of the water, liquid ammonia and propylene epoxide; the reactive rectification tower comprises 25-45 tower plates; the temperature at the top of the tower is controlled within the range of 31-50 DEG C, the temperature of the tower kettle is within the range of 165-310 DEG C, and the tower is under the pressure of 0.8MPa to 1.5MPa; the liquid ammonia feeding position is at the tower kettle of the reactive rectification tower or the first or second tower plate above the tower kettle. Compared with the traditional process, the method has the advantages that the content of monoisopropanolamine is increased by nearly 100%, and the content of triisopropanolamine is reduced by about 95% in comparison with the traditional process.

Description

technical field [0001] The invention belongs to the field of chemical reaction and separation, and specifically relates to a method for preparing monoisopropanolamine through reactive distillation. Background technique [0002] One isopropanolamine is 1-amino-2-propanol (chemical formula: CH 3 CH(OH)CH 2 NH 2 ), also known as monoisopropanolamine. Monoisopropanolamine has a wide range of uses: it can be used in household chemicals such as detergents, liquid detergents, and shampoos; it can be used in fabrics, wool spinning, and leather auxiliaries; it can be used in detergents for metal electronic liquid crystals and semiconductors; it can be used Used in the synthesis of pharmaceuticals, pesticides and flavors and fragrances intermediates. [0003] The reaction of propylene oxide and ammonia is strongly exothermic. When there is absolutely no water, it is difficult for propylene oxide to react with ammonia, and the addition of water can initiate a catalytic reaction. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C215/12C07C213/10
CPCY02P20/10
Inventor 李柏春王亚光李晓红
Owner HEBEI UNIV OF TECH
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