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Method for removing carbon dioxide in recycle gas for synthesizing ethylene oxide/glycol

A technology of ethylene oxide and carbon dioxide, which is applied in the field of gas purification, can solve the problems of increasing the amount of circulating gas entering the decarbonization absorption tower, increasing the split ratio of circulating gas to the decarbonization unit, and difficulty in passing through, so as to reduce heat and reduce CO2 content, heat load reduction effect

Active Publication Date: 2015-03-25
SINOPEC NANJING RES INST OF CHEM IND CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

To carry out transformation under the solvent and process conditions for the decarbonization of the original circulating gas, the main method is to increase the split ratio of the circulating gas to the decarbonization unit, that is, to increase the amount of circulating gas entering the decarbonization absorption tower. The existing absorption tower and its internals Difficult to pass, such that the recycle gas decarburization unit must be retrofitted

Method used

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  • Method for removing carbon dioxide in recycle gas for synthesizing ethylene oxide/glycol

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Embodiment 1

[0028] An ethylene oxide / ethylene glycol synthesis cycle gas decarburization unit uses potassium carbonate concentration of 15 (m)%, activator potassium metavanadate KVO 3 Concentration 5 (m)%, activator boric acid H 3 BO 3 The concentration is 20 (m)%, and the activator selenous acid is 2 (m)%. The absorption tower adopts two-stage absorption, and the circulating gas entering the tower bottom contacts with the cold and hot lean liquid coming in from the top and middle of the tower to remove carbon dioxide and absorb The operating temperature is 70°C at the top of the tower, 105°C at the bottom of the tower, and the pressure is 2.2 Mpa (table), and the circulating gas enters the tower CO 2 The content is 4 mol %, leaving the absorption tower residual CO 2 2 <1.0 mol % requirement. A new double-tower variable pressure regeneration is adopted, and the pressure at the top of the pressurized regeneration tower is 0.08MPa (gauge), which is kept stable through the pressure regula...

Embodiment 2

[0030] An ethylene oxide / ethylene glycol synthesis cycle gas decarburization unit uses potassium carbonate concentration of 20 (m)%, activator potassium metavanadate KVO 3 Concentration 1(m)%, activator boric acid H 3 BO 3 The concentration is 4 (m)%; the absorption tower (2.1 meters in diameter) adopts two-stage absorption, and the 3886 Kmol / h circulating gas entering the bottom of the tower contacts with the cold and hot lean liquid coming in from the top and middle of the tower to remove carbon dioxide in countercurrent, and the absorption operation The temperature at the top of the tower is 80°C, the bottom of the tower is 109°C, the pressure is 1.8 Mpa (table), and the circulating gas enters the tower CO 2 The content is 3 mol %, leaving the absorption tower residual CO 2 2 <0.9 mol % requirement. A new double-tower pressure-swing regeneration is adopted. The top pressure of the pressurized regeneration tower is 0.08MPa (gauge) and is kept stable through the pressure r...

Embodiment 3

[0032] An ethylene oxide / ethylene glycol synthesis cycle gas decarburization unit uses potassium carbonate concentration of 30 (m)%, activator potassium metavanadate KVO 3 Concentration 8 (m)%, activator boric acid H 3 BO 3 The concentration is 30 (m)%, the activator selenous acid is 1 (m)%; the absorption tower (2.6 meters in diameter) adopts two-stage absorption, and the 7350 Kmol / h circulating gas entering the bottom of the tower is contacted with cold and hot lean liquid countercurrently to remove Carbon dioxide, the temperature of the absorption operation is 70°C at the top of the tower, 110°C at the bottom of the tower, and the pressure is 1.8 Mpa (table), and the circulating gas enters the tower CO 2 The content is 2.36 mol %, leaving the absorption tower residual CO 2 2 <0.4 mol % requirement. The new double-tower variable pressure regeneration is adopted, the pressure at the top of the pressurized regeneration tower is 0.09MPa (table), the boiling point of the carb...

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Abstract

The invention belongs to the technical field of gas purification and provides a decarbonization solution and a decarbonization method due to the fact that CO2 content in recycle gas needs to be lowered when a novel high selective catalyst is adopted for synthesizing ethylene oxide / glycol. The solution is composed of potassium carbonate and an inorganic activating agent. Two-section absorption process of appropriate flow distribution and temperature control is adopted. Desorbing of the solution adopts novel transformation regeneration energy-saving technology, differential pressure is formed between two towers of a pressurization regeneration tower and a normal pressure regeneration tower by using a desorbing effect of an adjustable supersonic speed steam ejector on the normal pressure regeneration tower, mixed gas containing a large amount of water vapour is desorbed for gas stripping and regeneration for the pressurized regeneration tower. By means of the method, residue CO2 in the recycle gas after decarbonization is greatly reduced, and simultaneously solution reclaimed heat consumption is reduced by more than 30% compared with conventional potassium carbonate decarbonization process.

Description

[0001] This application is a divisional application of 200810196779.3, the filing date of the original application is 2008.10.13, and the application number is 200810196779.3; the title of the invention is: an aqueous solution and method for removing carbon dioxide from ethylene oxide / ethylene glycol synthesis cycle gas. technical field [0002] The invention belongs to the technical field of gas purification, in particular to a method for removing CO from ethylene oxide / ethylene glycol synthesis cycle gas containing a large amount of hydrocarbons and a certain amount of oxygen 2 aqueous solutions and methods. Background technique [0003] High-purity ethylene is oxidized with pure oxygen to generate ethylene oxide (EO), and ethylene oxide is absorbed by water, desorbed, reabsorbed, evaporated, concentrated and rectified to obtain high-purity ethylene glycol (EG) products. A certain amount of CO is produced during the oxidation of ethylene to ethylene oxide 2 , which must b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D303/04C07D301/32
CPCY02P20/10Y02P20/52
Inventor 王祥云储政朱道平
Owner SINOPEC NANJING RES INST OF CHEM IND CO LTD
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