Method for separating ammonia and carbon dioxide by low-temperature rectification

A carbon dioxide and low temperature rectification technology, which is applied in the field of low temperature rectification to separate ammonia and carbon dioxide, can solve the problems of high energy consumption, large investment, and difficulty in supporting public works, etc., and achieves reasonable process, low engineering cost, and small supporting difficulty. Effect

Inactive Publication Date: 2014-08-06
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method requires large investment, high energy consumption, and difficulty in matching public works.

Method used

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  • Method for separating ammonia and carbon dioxide by low-temperature rectification
  • Method for separating ammonia and carbon dioxide by low-temperature rectification
  • Method for separating ammonia and carbon dioxide by low-temperature rectification

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Such as figure 1 As shown, the temperature is 25°C, the pressure is 0.14MPa, and the standard flow rate is 5000NM 3 / h mixed gas of ammonia and carbon dioxide (among them, NH 3 / CO 2 The volume ratio is 1:4), add the low-temperature ammonia and carbon dioxide gas in the heat exchanger and return to carry out heat exchange and cooling, and then enter the middle part of the single-stage rectification tower for rectification separation, the pressure in the single-stage rectification tower About 0.12MPa.

[0036] The temperature of the compressed carbon dioxide gas is 25°C, the pressure is 1.55MPa, and the standard flow rate is 3000NM 3 / h, enter the condenser arranged at the bottom of the single-stage rectification tower to exchange heat with the liquid ammonia at the bottom of the single-stage rectification tower after being cooled by the heat exchanger and the refluxed low-temperature ammonia and carbon dioxide gas. Liquid ammonia gasification, 1000M 3 Ammonia gas i...

Embodiment 2

[0041] Such as figure 2 As shown, the temperature is 25°C, the pressure is 0.6MPa, and the standard flow rate is 5000NM 3 / h mixed gas of ammonia and carbon dioxide (among them, NH 3 / CO 2 The volume ratio is 1:4), put into the heat exchanger and return the low-temperature ammonia and carbon dioxide gas for heat exchange and cooling, and then enter the middle part of the single-stage rectification tower for rectification separation. The pressure of the single-stage rectification tower is about 0.58 MPa.

[0042] The temperature of the compressed carbon dioxide gas is 25°C, the pressure is 5.0MPa, and the standard flow rate is 3000NM 3 / h, enter the condenser arranged at the bottom of the single-stage rectification tower to exchange heat with the liquid ammonia at the bottom of the single-stage rectification tower after being cooled by the heat exchanger and the refluxed low-temperature ammonia and carbon dioxide gas. Liquid ammonia gasification, 1000M 3 Ammonia gas is dr...

Embodiment 3

[0047] Such as image 3 As shown, the temperature is 25°C, the pressure is 0.75MPa, and the standard flow rate is 5000NM 3 / h mixed gas of ammonia and carbon dioxide (among them, NH 3 / CO 2 The volume ratio is 1:2), add the low-temperature ammonia and carbon dioxide gas in the heat exchanger to neutralize the reflux for heat exchange and cooling, and then expand and cool through the expander and then enter the middle of the single-stage rectification tower for rectification and separation. The pressure of the rectification tower is about 0.12MPa.

[0048] The temperature of the compressed carbon dioxide gas is 25°C, the pressure is 1.55MPa, and the standard flow rate is 3000NM 3 / h, enter the condenser arranged at the bottom of the single-stage rectification tower to exchange heat with the liquid ammonia at the bottom of the single-stage rectification tower after being cooled by the heat exchanger and the refluxed low-temperature ammonia and carbon dioxide gas. Liquid ammo...

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Abstract

The invention provides a method for separating ammonia and carbon dioxide by low-temperature rectification, wherein mixed gas of ammonia and carbon dioxide is taken as a raw material, and rectification separation is performed after the mixed gas of the ammonia and the carbon dioxide is cooled. The method provided by the invention has the advantages of low engineering cost, simplicity in operation, small difficulty in matching with public works and strong applicability; and particularly, a large amount of water is not required, so that the method is green and environment-friendly and particularly suitable for treatment of tail gas from production of urea and melamine.

Description

technical field [0001] The invention relates to a method for separating ammonia and carbon dioxide by low-temperature rectification, in particular to a method suitable for separating ammonia and carbon dioxide in the tail gas produced in the production of urea and melamine. Background technique [0002] The main component of the tail gas produced by the production of urea and melamine is the mixed gas of ammonia and carbon dioxide. At present, the main separation method is: first, the mixed gas of ammonia and carbon dioxide is absorbed by water to generate ammonium bicarbonate liquid; then, the ammonium bicarbonate liquid is transferred to The carbon dioxide desorption tower is heated by steam, and then washed with a large amount of water to separate part of the carbon dioxide and the low-concentration high-ammonia-carbon ratio solution; then, the low-concentration, high-ammonia-carbon ratio solution is transferred to the ammonia distillation tower, and the The steam makes i...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): F25J3/02
CPCY02C10/12Y02C20/40
Inventor尤彪杨树勋
Owner尤彪