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Method for producing isopropanolamine by using fixed bed tubular reactor

A tubular reactor and isopropanolamine technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of difficult process control, low production efficiency, and many by-products, and achieve uniform distribution , reduce production efficiency and save total energy consumption

Active Publication Date: 2016-02-24
ZHEJIANG JINGGONG NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] 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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  • Method for producing isopropanolamine by using fixed bed tubular reactor
  • Method for producing isopropanolamine by using fixed bed tubular reactor
  • Method for producing isopropanolamine by using fixed bed tubular reactor

Examples

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Embodiment 1

[0035] Such as figure 1 A kind of method that utilizes fixed-bed tubular reactor to produce isopropanolamine is shown, and its steps are:

[0036] (a) Using water as a catalyst, mix ammonia and water to form ammonia water with a concentration of 90% and store it in the ammonia water raw material tank, put ammonia water and propylene oxide into a fixed bed tubular reactor for reaction at the same time, ammonia water 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°C. The fixed bed tubular reactor includes the reaction tube body 1, the Jacket 2 (see figure 2), the reaction tube body is provided with a number of propylene oxide feed liquid phase distribution plates 3 at longitudinal intervals, and the propylene oxide feed liquid phase distribution plate divides the inside of the reaction tube body into sever...

Embodiment 2

[0042] The technological process of the present embodiment and embodiment 1 figure 1 , fixed-bed tubular reactor structure and embodiment 1 Figure 2~4 They are all identical, so they will not be repeated here. The difference lies in the process parameters of each step:

[0043] (a) Using water as a catalyst, mix ammonia and water to prepare ammonia water with a concentration of 99.5% and store it in the ammonia water raw material tank. Put ammonia water and propylene oxide into a fixed-bed tubular reactor for reaction at the same time. Ammonia water and propylene oxide The molar ratio of feed to material 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.

[0044] (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.

[0045] (c) Pass the bottom discharge of the second flash tank into the dehydration tower, a...

Embodiment 3

[0048] The technological process of the present embodiment and embodiment 1 figure 1 , fixed-bed tubular reactor structure and embodiment 1 Figure 2~4 They are all identical, so they will not be repeated here. The difference lies in the process parameters of each step:

[0049] (a) Using water as a catalyst, mix ammonia and water to form ammonia water with a concentration of 95% and store it in the ammonia water raw material tank, put ammonia water and propylene oxide into a fixed bed tubular reactor for reaction at the same time, ammonia water and propylene oxide The molar ratio of feed to material 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.

[0050] (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.

[0051] (c) Pass the bottom discharge of the second flash tank into the dehydration tower, and sep...

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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 uses, such as diisopropanolamine is an excellent acid gas absorbent in the oil and gas industry, and more than 80% of the refinery gas in foreign petrochemical plants uses diisopropanolamine as desulfurization agent, with an annual demand of more than 100,000 tons. In the detergent industry, diisopropanolamine is widely used in the production of soap and washing powder due to its mild alkalinity and outstanding detergency. It is an important low-molecular cross-linking agent in the polyurethane industry, and an important raw material for the ...

Claims

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Application Information

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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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