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Method for removing CO2 from conversion gas

A gas conversion and removal technology, applied in separation methods, chemical instruments and methods, using liquid contact hydrogen separation, etc., to achieve the effects of small space occupied by equipment, low energy consumption, and low equipment investment

Inactive Publication Date: 2008-04-30
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the use of supergravity technology can remove CO from the shift gas of synthetic ammonia under a relatively high operating pressure. 2 The research has not been reported at home and abroad so far

Method used

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  • Method for removing CO2 from conversion gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Raw material gas composition: hydrogen: 60.9% nitrogen: 19.69% carbon dioxide: 18.36% carbon monoxide: 0.3% and the balance is inert gas.

[0024] Absorbent composition: Potassium carbonate: 27%, diethanolamine: 2.5%, and the balance is desalted water. Adjust the temperature of the system to 75°C, adjust the pressure to 1.8Mpa, start the supergravity rotating bed reactor, adjust the rotor speed to 900r / m, and then open the control valve of the liquid inlet of the reactor, and the absorbent is distributed by the liquid through the liquid phase inlet pipe 1 The device is sprayed to the inner edge of the supergravity rotating bed rotor 4, and the flow rate of the regulating liquid is 70 liters / hour, and the CO containing CO from the previous section 2 The shifted gas enters the high-gravity rotating bed reactor through the gas phase inlet pipe 2, and contacts with the absorption liquid countercurrently in the rotor of the high-gravity rotating bed, and conducts CO under hi...

Embodiment 2-12

[0026] Process flow and step are with embodiment 1, and the flow rate of temperature, pressure, gas-liquid, rotor speed and test result of each embodiment are shown in Table 1.

[0027] The absorbent is a hot potassium alkali solution with an activator added, and the mass percentage concentrations are 20-60%, 25-40%, 30-35%, respectively, and the activator is diethanolamine or ACT-1, and the mass percentage concentrations are 1-35%. 5%, 1.5-4%, 2-3.5%. The absorbent is sodium hydroxide or potassium hydroxide solution, and the mass percent concentration is 1-40%, 5-35%, and 10-30% respectively.

[0028] Process conditions and test results of each embodiment of table 1

[0029] implement

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Abstract

The invention provides a method for removing CO2 in exchanging gas. The method employs a hypergravity revolving bed which enables an absorber and the exchanging gas to be contacted in the manner of adverse current or cross current in the hypergravity revolving bed. The removing of CO2 is processed under the condition of hypergravity. The current rate of gas and liquid is 5 to 1-35 to 1, and the rotation speed of the rotor of the hypergravity revolving bed is 100-3000 circles per minute. The absorber is hot potash solution and caustic lye of soda solution or caustic potash solution which are added with an activating agent. The percentage concentration of the quality of the hot potash solution is 20-60%, the percentage concentration of the quality of the activating agent is 1-5%, and the percentage concentration of the quality of the caustic lye of soda solution or caustic potash solution is 1-40%. In the time of absorption and reaction, the pressure is 0.5-4.0 MPa, and the temperature is 60-120 degrees. The invention is capable of removing the amount of CO2 in raw gas to be below 0.1% (volume). The invention has the advantages of little equipment investment, low energy consumption, small occupied volume and the like.

Description

technical field [0001] The invention relates to a method for removing CO in shift gas by using a supergravity rotating bed reactor 2 Methods. Background technique [0002] In the synthetic ammonia production process, the second-stage reforming gas of natural gas, after high-temperature reforming, CO 2 The content is as high as 18-19%, due to CO 2 can poison the catalyst, so the shift gas must be completely removed before entering the synthesis loop; in addition, CO 2 It is also the raw material of urea plant, CO 2 The removal and recovery of CO is directly related to the carbon balance of the ammonia synthesis process system, therefore, CO 2 removal is crucial. CO removal 2 The energy consumption accounts for about 10% of the energy consumption of the whole ammonia production, so the removal of CO 2 The energy consumption of the process has a great impact on the total energy consumption of the ammonia plant. [0003] At present, the industrial absorption of CO 2 The...

Claims

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Application Information

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IPC IPC(8): B01D53/18C01B3/52
CPCY02P20/151
Inventor 杨春基陈建峰曾群英邹海魁杜海初广文白玉洁李幸辉冯英明郭锴关伟宏易飞冯英杰王斯晗张宝军曲家波孟锐张永军苑慧敏李影辉李文鹏赵晶莹王秀文李德全
Owner PETROCHINA CO LTD
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