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CO2 Recovery Technology

CO2 Recovery Technology

Country/Region china
Company Jiangsu Kaimao Chemical Technology Co., Ltd
Categories Food Grade Acetic Acid
Update 2017-09-01 10:12:19
ICP License Issued by the Chinese Ministry
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CO2 Recovery Technology

There are wide sources of CO2. Mainly sources: CO2 gas field, oil refinery plant hydrogen generation process in oil refinery plant, chemical fertilizer plant; mine ore decomposition; mine gas in the mine well, fermentation process etc.

According to different CO2 sources and different customer requirements, the recovery methods are also different. It can be generalized in five methods:
Solvent absorption method; pressure differential absorption method; organic membrane separation, absorption distillation method; and catalysis burning method.

Section A. CO2 Recovery Process

Based on CO2 gas concentration, Jiangsu Kaimao Chemical Technology Co., Ltd. has two recovery technology: Solvent absorption method (Chemical absorption method) and absorption distillation method.

1.Chemical absorption method
Chemical absorption method is mainly applied in about 25%CO2 concentration flue gas. Use chemical solvents to absorb CO2 in the flue gas at low temperature; when the solution is heated, CO2 will be stripped from the chemical solvents and high concentration CO2 is received, while the solvents can be circulated for re-use.

Chemical absorption method features:
1)The CO2 chemical absorption solvents developed by Jiangsu Kaimao (patent applied) has higher absorption rate than common absorption solvents with quick stripping under low stripping temperature, therefore, reduce absorption solvents consumption, decrease energy consumption with high stability, no degrading and save operation costs. Our new type solvent facility investment is 1/3 lower than MEA solvent facility.
2)Set effluent gas pretreatment system, sulfides, dust, water and impurities will be removed in scrubber at one time. The newly developed SO2 absorption solution ( Patent applied) by Kaimao Co. can only absorb SO2 gas, not CO2, thus, the CO2 recovery yield will be increase greatly.
3)CO2 collecting process uses heat exchanger, CO2 cooler several stages heat exchanging facilities to achieve comprehensive use of heat. The system has low energy consumption.
4)Use effluent gas scrubbing, gas/liquid separation etc. system to sufficiently recover the special absorption solution in the effluent gas and maintain water balance for the whole collecting system with low consumption of absorption solution and water.

2.Absorption distillation method
The CO2 recovery and refining technology developed by Kaimao Co. by using absorption distillation method is applied for recovering high concentration (CO2 more than 90%) CO2 gas to meet Chinese food grade and industrial grade standard.

Technical features of absorption distillation method
1)Different recipes and performance of absorption solution is applied for removing sulfides, nitrogen, oxygen compounds, grease, and oxygen contained organic chemicals, hydrocarbons, benzene series chemicals, nitrogen, phosphoric cyanides and water, based on different impurities in the high concentration carbon dioxide, so that to meet Chinese food grade standard requirement.
2)Use scientific method to select several different function absorption agents filling on the absorption or drying bed to absorb different compositions, as a result, to achieve simple flow process and operation costs reduction.
3)Directly use the light fraction gas discharged from the top of distillation tower and flashing distillation tank as the regeneration gas for the absorption and drying bed. In this way, no need to use high temperature steam or high purity nitrogen gas, greatly reduce operation costs.
4)Based on the light fraction compositions properties, which contains hydrogen, oxygen, nitrogen, argon and methane gas, select advanced and complicated SH-BWR non-ideal materials system module to calculate and obtain accurate distillation tower design parameters, also use heat pump distillation technology to assure all the light fraction compositions to be removed to ppm grade.
5)Through scientific comparison and optimized design, the process uses low and middle pressure CO2 liquefaction purification technology, which can simplify process, save investment, reduce costs and still produce high purity CO2 product.
6)The whole process uses absorption and distillation combination method to achieve simple process, easy operation. and can produce industrial grade product. Food grade product is also able to be produced through proper innovation. It has flexible process and strong market adaptability.
7)High automation, main specification index are automatically monitored and adjusted, no need operator work on the site.

Section B. CO2 Applications

CO2 has wide sources, also has wide applications. Mainly as following:
1.Machinery Industry: CO2 gas protection welding is the key promoted technical

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