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An energy-saving process for separating ethylenediamine-water with complete heat integration and pressure-swing separation in side line production

A side-line extraction and ethylenediamine technology, which is used in the purification/separation of amino compounds, chemical industry, sustainable manufacturing/processing, etc., can solve the problem of high energy consumption for separation, difficulty in separation of ethylenediamine-water, and large equipment investment, etc. question

Active Publication Date: 2021-09-14
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention provides an energy-saving process for separating ethylenediamine-water with complete heat integration and variable pressure in the side line extraction, which solves the problem of difficult separation of ethylenediamine-water due to the existence of the highest azeotrope. Compared with other methods, the process not only Save equipment costs and operating costs, save energy consumption, reduce costs, and the product has high separation purity and no environmental pollution
[0011] Aiming at the problems of high separation energy consumption and large equipment investment of ethylenediamine-water binary azeotropic mixture in the process of pressure swing rectification, the present invention provides a complete heat-integrated pressure-swing separation method for separating ethylenediamine-water from side line extraction Energy saving process

Method used

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  • An energy-saving process for separating ethylenediamine-water with complete heat integration and pressure-swing separation in side line production
  • An energy-saving process for separating ethylenediamine-water with complete heat integration and pressure-swing separation in side line production
  • An energy-saving process for separating ethylenediamine-water with complete heat integration and pressure-swing separation in side line production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] with attached figure 1 In the process flow diagram shown, the feed flow rate is 1000kg / h, the feed temperature is 47°C, and the feed composition is 60% (mass fraction) of ethylenediamine and 40% (mass fraction) of water. The theoretical plate number of the high-pressure distillation column is 60, the pressure is 2.0atm (absolute pressure), the feed is fed from the 6th plate, the circulating feeding position is the 14th plate, the side line extraction position is the 29th plate, and the reflux The ratio is 5.8; the number of theoretical plates of the low-pressure rectification tower is 22, the pressure is 0.1atm (absolute pressure), the feed is fed from the 11th tray, the feed position of the side line is the 8th tray, and the reflux ratio is 3. After separation, the ethylenediamine product has a purity of 99.95% and a recovery rate of 99.85%, and the aquatic product has a purity of 99.95% and a recovery rate of 99.85%.

[0030] The energy consumption comparison data of...

Embodiment 2

[0034] with attached figure 1 In the process flow diagram shown, the feed flow rate is 1200kg / h, the feed temperature is 47°C, and the feed composition is 65% (mass fraction) of ethylenediamine and 35% (mass fraction) of water. The theoretical plate number of the high-pressure rectification tower is 65, the pressure is 3.0atm (absolute pressure), the feed is fed from the 10th plate, the circulating feeding position is the 16th plate, the side line extraction position is the 29th plate, and the reflux The ratio is 6.0; the number of theoretical plates of the low-pressure rectification tower is 23, the pressure is 0.3atm (absolute pressure), the feed is fed from the 13th tray, the feeding position of the side line is the 9th tray, and the reflux ratio is 4. After separation, the ethylenediamine product has a purity of 99.96% and a recovery rate of 99.86%, and the aquatic product has a purity of 99.96% and a recovery rate of 99.86%.

[0035] The energy consumption comparison dat...

Embodiment 3

[0038] with attached figure 1In the process flow diagram shown, the feed flow rate is 1500kg / h, the feed temperature is 47°C, and the feed composition is 70% (mass fraction) of ethylenediamine and 30% (mass fraction) of water. The theoretical plate number of the high-pressure rectification column is 68, the pressure is 4.0atm (absolute pressure), the feed is fed from the 15th plate, the circulating feeding position is the 18th plate, the side line extraction position is the 35th plate, and the reflux The ratio is 6.3; the number of theoretical plates of the low-pressure rectification column is 25, the pressure is 0.5 atm (absolute pressure), the feed is fed from the 15th plate, the feed position of the side line is the 10th plate, and the reflux ratio is 5. After separation, the ethylenediamine product has a purity of 99.97% and a recovery rate of 99.87%, and the aquatic product has a purity of 99.97% and a recovery rate of 99.87%.

[0039] The energy consumption comparison d...

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Abstract

The invention relates to an energy-saving process for separating ethylenediamine-water with complete heat integration and pressure transformation in side line extraction. The ethylenediamine-water mixed solution first enters the high-pressure tower T1, and high-purity product water is extracted from the top of the tower. The top stream of the high-pressure tower T1 and the bottom stream of the low-pressure tower T2 perform complete heat exchange, and the inner line stream and the bottom stream of the tower enter The low-pressure tower T2 produces high-purity product ethylenediamine at the top of the low-pressure tower. The product mass fraction of the present invention is above 99.9%, and the present invention adopts the mode of side line and complete heat integration, so that the energy consumption is greatly reduced. The invention only needs one reboiler and one condenser, which saves equipment cost and energy consumption, and has the advantages of simple process and high product purity.

Description

【Technical field】 [0001] The invention belongs to the field of rectification and purification in the chemical industry, and in particular relates to an energy-saving process for separating ethylenediamine-water with complete heat integration and variable pressure separation of side line extraction. 【Background technique】 [0002] Ethylenediamine is an important chemical raw material and reagent. Due to its strong affinity to carbon dioxide, hydrogen sulfide, carbon disulfide, mercaptan, sulfur, aldehyde, phenol, etc., it can be used as a gasoline additive, lubricating oil, fish oil, mineral oil and alcohol refining use. In addition, it is also used as a solvent for fiber protein and protein protein, epoxy resin curing agent and medicine, pesticide, dye, textile finishing agent, metal chelating agent, preservative, ion exchange resin, latex stabilizer, rubber vulcanization accelerator, Raw materials for the manufacture of antifreeze, etc. [0003] At present, in the process...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C211/10C07C209/86
CPCC07C209/86C07C211/10Y02P20/10
Inventor 朱兆友徐颖赵霏王英龙崔培哲
Owner QINGDAO UNIV OF SCI & TECH
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