A kind of method utilizing fixed-bed tubular reactor to produce isopropanolamine

A tubular reactor and isopropanolamine technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as difficult process control, low production efficiency, and many by-products, and achieve process stability , reduce production efficiency, and evenly distribute the effect

Active Publication Date: 2017-06-23
ZHEJIANG JINGGONG NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The present invention aims to solve the problems of high energy consumption, low production efficiency, difficult process control and many by-products in the production method of isopropanolamine in the prior art, and provides a process with simple process steps, stable and controllable process, and high production efficiency. Method for producing isopropanolamine with low energy consumption and few by-products using fixed-bed tubular reactor

Method used

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  • A kind of method utilizing fixed-bed tubular reactor to produce isopropanolamine
  • A kind of method utilizing fixed-bed tubular reactor to produce isopropanolamine
  • A kind of method utilizing fixed-bed tubular reactor to produce isopropanolamine

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Effect test

Embodiment 1

[0036] Such as figure 1 Shown is a method for producing isopropanolamine by using a fixed-bed tubular reactor, and its steps are:

[0037] (A) Using water as a catalyst, mix ammonia and water to form a 90% concentration of ammonia and store it in the ammonia raw material tank. Put the ammonia and propylene oxide into the fixed-bed tubular reactor at the same time to react, the ammonia and propylene oxide The feeding molar ratio of the fixed-bed tubular reactor is 3.5:1, the operating pressure of the fixed-bed tubular reactor is 8MPa, and the operating temperature of the fixed-bed tubular reactor is 160℃. The fixed-bed tubular reactor includes a reaction tube body 1. Jacket 2 (see figure 2 ), a number of propylene oxide feed liquid phase distribution discs 3 are arranged longitudinally in the reaction tube body. The propylene oxide feed liquid phase distribution disc divides the reaction tube body into several reaction zones, and the reaction zone is provided with a filling carrie...

Embodiment 2

[0043] The process flow of this embodiment is the same as that of embodiment 1 figure 1 , Fixed bed tubular reactor structure and example 1 Figure 2~4 They are all the same, so I won’t repeat them here. The difference lies in the process parameters of each step:

[0044] (A) Using water as a catalyst, mix ammonia and water to form ammonia water with a concentration of 99.5% and store it in the ammonia water raw material tank. Put the ammonia water and propylene oxide into the fixed-bed tubular reactor at the same time to react, the ammonia water and propylene oxide The molar ratio of the feed is 15:1, the operating pressure of the fixed-bed tubular reactor is 25MPa, and the operating temperature of the fixed-bed tubular reactor is 220°C.

[0045] (B) The operating pressure of the first flash tank is 18 bar, and the operating pressure of the second flash tank is 1.0 bar.

[0046] (C) Pass the bottom output of the second flash tank into the dehydration tower, and separate water and p...

Embodiment 3

[0049] The process flow of this embodiment is the same as that of embodiment 1 figure 1 , Fixed bed tubular reactor structure and example 1 Figure 2~4 They are all the same, so I won’t repeat them here. The difference lies in the process parameters of each step:

[0050] (A) Using water as the catalyst, mix ammonia and water to form 95% ammonia water and store it in the ammonia water raw material tank. Put the ammonia water and propylene oxide into the fixed-bed tubular reactor at the same time to react, the ammonia water and propylene oxide The molar ratio of the feed is 5:1, the operating pressure of the fixed-bed tubular reactor is 10MPa, and the operating temperature of the fixed-bed tubular reactor is 180°C.

[0051] (B) The operating pressure of the first flash tank is 12 bar, and the operating pressure of the second flash tank is 0.5 bar.

[0052] (C) Pass the bottom output of the second flash tank into the dehydration tower, and separate water and part of monoisopropanolami...

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Abstract

The present invention discloses a method for producing isopropanolamine by using a fixed bed tubular reactor. The method comprises: by using water as a catalyst, putting ammonia and epoxy propane with a molar ratio of (3.5-15):1 into a fixed bed reactor to perform a reaction, wherein the operation pressure of the reactor is 8-25 MPa, and the operation temperature is 160-220 DEG C; pumping a reaction product sequentially into a first flash evaporation tank and a second flash evaporation tank, performing two-stage flash evaporation and ammonia removal on the reaction product, and then introducing the processed reaction product into a dehydration tower for primary dehydration; introducing dehydration materials at the bottom of the dehydration tower into a monoisopropanolamine rectification tower, introducing discharged materials at the top of the monoisopropanolamine rectification tower into a monoisopropanolamine conversion reactor, and returning the materials to the bottom of the monoisopropanolamine rectification tower after reaction; introducing discharged materials at the top of the monoisopropanolamine rectification tower into a diisopropanolamine rectification tower, and after low pressure rectification, obtaining diisopropanolamine at the top of the diisopropanolamine rectification tower, and obtaining triisopropanolamine at the bottom of the diisopropanolamine rectification tower. The method provided by the present invention is capable of reducing the energy consumption of the whole process, effectively avoids reaction and side product generation, and improves the product purity.

Description

Technical field [0001] The invention relates to a method for producing isopropanolamine, in particular to a method for producing isopropanolamine by using a fixed-bed tubular reactor. Background technique [0002] Diisopropanolamine (DIPA) is one of the three derivatives of 1-amino-2-propanol, and the other two derivatives are monoisopropanolamine (MIPA) and triisopropanolamine (TIPA). Diisopropanolamine has a wide range of industrial applications. For example, in the petroleum and natural gas industry, diisopropanolamine is an acid gas absorbent with excellent performance. More than 80% of the refinery gas in foreign petrochemical plants uses diisopropanolamine as desulfurization. The annual demand is more than 100,000 tons. In the detergent industry, diisopropanolamine is widely used in the production of soap and washing powder because of its mild alkalinity and outstanding decontamination ability. It is an important low-molecular crosslinking agent in the polyurethane indust...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C213/04C07C215/12
CPCC07C213/04C07C215/12
Inventor 李波徐开兵陈伟宫有圣朱烨俊
Owner ZHEJIANG JINGGONG NEW MATERIAL TECH
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