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Method for producing ethanolamine by liquid ammonia method

A technology of ethanolamine and ethanolamine essence, applied in chemical instruments and methods, preparation of organic compounds, preparation of amino hydroxyl compounds, etc., can solve the problems of high product chroma, low technical level, general quality of ethanolamine, etc., and achieve activity and selectivity High, reduce production costs, save equipment investment effect

Active Publication Date: 2016-04-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process has high selectivity, easy separation of products, centralized recovery and utilization of reaction heat, and low energy consumption. It is the development direction of ethanolamine technology. However, its catalyst operation period is short (only a few days), which is an urgent problem to be solved.
[0009] At present, the domestic production of ethanolamine mainly adopts the traditional ammonia water method, and the reaction system is huge. Due to the existence of water, the by-products such as amine ether increase, the ammonia recovery efficiency is low, and the separation process needs to remove water, and the unit product consumption and energy consumption are high.
Generally speaking, the domestic ethanolamine industry is currently in the development stage. The product quality of ethanolamine is average, the product chroma is high, the existing technology level is low, the competitiveness is poor, and the adjustable range of product ratio is narrow.

Method used

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  • Method for producing ethanolamine by liquid ammonia method
  • Method for producing ethanolamine by liquid ammonia method
  • Method for producing ethanolamine by liquid ammonia method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] use as figure 1 The process flow shown. Ethylene oxide EO, fresh liquid ammonia FN and circulating ammonia RN enter the three-stage adiabatic fixed-bed reactor R-101, and react with the ZSM-5 catalyst to generate ammonia-containing ethanolamine reaction products;

[0026] The ammonia-containing reaction product from reactor R-101 is divided into three parts: S1, S2 and S3:

[0027] (1) The first part of the reaction product S1 is decompressed to 2.2MPa through the pressure reducing valve, and enters the primary flash tank V-101 for the first flash evaporation; the gas phase from the primary flash tank V-101 enters the condenser E -104 condenses, and the obtained condensate enters the reactor R-101 after being mixed with the fresh liquid ammonia FN through the circulation pump P-101; the liquid phase from the primary flash tank V-101 enters the heat exchanger E-101, and the first The two-part reaction product S2 is heat-exchanged to 70°C, enters the heater E-103 and is...

Embodiment 2

[0043] use as figure 1 The process flow shown. Ethylene oxide EO, fresh liquid ammonia FN and circulating ammonia RN enter the three-stage adiabatic fixed-bed reactor R-101, and react with the ZSM-5 catalyst to generate ammonia-containing ethanolamine reaction products;

[0044] The ammonia-containing reaction product from reactor R-101 is divided into three parts: S1, S2 and S3:

[0045] (1) The first part of the reaction product S1 is decompressed to 1.7MPa through the pressure reducing valve, and enters the primary flash tank V-101 for the first flash evaporation; the gas phase from the primary flash tank V-101 enters the condenser E -104 condenses, and the obtained condensate enters the reactor R-101 after being mixed with the fresh liquid ammonia FN through the circulation pump P-101; the liquid phase from the primary flash tank V-101 enters the heat exchanger E-101, and the first The second part of the reaction product S2 is heat-exchanged to 60°C, enters the heater E-...

Embodiment 3

[0061] use as figure 1 The process flow shown. Ethylene oxide EO, fresh liquid ammonia FN and circulating ammonia RN enter the three-stage adiabatic fixed-bed reactor R-101, and react with the ZSM-5 catalyst to generate ammonia-containing ethanolamine reaction products;

[0062] The ammonia-containing reaction product from reactor R-101 is divided into three parts: S1, S2 and S3:

[0063] (1) The first part of the reaction product S1 is decompressed to 2.0MPa through the pressure reducing valve, and enters the primary flash tank V-101 for the first flash evaporation; the gas phase from the primary flash tank V-101 enters the condenser E -104 condenses, and the obtained condensate enters the reactor R-101 after being mixed with the fresh liquid ammonia FN through the circulation pump P-101; the liquid phase from the primary flash tank V-101 enters the heat exchanger E-101, and the first The second part of the reaction product S2 is heat-exchanged to 75°C, enters the heater E-...

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Abstract

The invention relates to a method for producing ethanol amine by using a liquid ammonia method, and mainly solves the technical problems that in the prior art, the reaction system is large in size, rich in byproduct, low in ammonia recycling rate, high in energy consumption and the like. The method solves the problems well by adopting the technical scheme that a three-section insulating fixed bed reactor is adopted; a reaction product is divided into three parts; after the first part of the reaction product is subjected to the first flashing, the liquid phase exchanges heat with the second part of the reaction product and is heated for the second flashing; after being subjected to heat exchange, the second part of the reaction product is further cooled down and circulated into the reactor to be used as a cold shock liquid to control the reaction temperature of the reactor; the third part of the reaction product is directly circulated back to the first section of the reactor; the liquid phase after the first part of the reaction product is subjected to the second flashing passes through an ammonia recycling tower so as to recycle the ammonia; the liquid phase of an ammonia recycling tower kettle liquid passes through a monoethanolamine distilling tower, a diethanol amine distilling tower and a triethanolamine distilling tower and is sucked out from depressurizing distillation separation side lines so as to obtain products of monoethanolamine, diethanol amine and triethanolamine. The method can be applied to industrial production of ethanol amine.

Description

technical field [0001] The invention relates to the field of ethanolamine production, in particular to a method for producing ethanolamine by using liquid ammonia and ethylene oxide as raw materials under the action of a catalyst. Background technique [0002] In recent years, ethanolamine has played an increasingly important role in secondary oil recovery, gas purification and pharmaceutical intermediates. At present, the total production capacity of ethanolamine in the world is about 1.8 million tons, and the annual output is about 1.5 million tons. The production capacity is mainly concentrated in the United States, Europe and East Asia, and the main consumption areas are the United States, Europe and China. [0003] Industrially, ethylene oxide and ammonia react under liquid phase conditions. The reaction is a three-step series reaction to produce three products: monoethanolamine, diethanolamine and triethanolamine. The reaction equation is as follows: [0004] [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C215/08C07C213/04C07C213/10
Inventor 胡松杨卫胜
Owner CHINA PETROLEUM & CHEM CORP