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VACUUM ›› 2020, Vol. 57 ›› Issue (6): 69-74.doi: 10.13385/j.cnki.vacuum.2020.06.15

• Vacuum Acquisition System • Previous Articles     Next Articles

Experimental Study on Adsorption Isotherms of Activated Carbon at Low Temperature and Pressure

SUN Lu-yao1, CHEN Guang-qi2   

  1. 1.Shenyang Hengjin Vacuum Technology Co., Ltd., Shenyang 110168, China;
    2.Zhangjiagang Furui Special Equipment Co., Ltd., Zhangjiagang 215637, China
  • Received:2020-06-29 Online:2020-11-25 Published:2020-11-30

Abstract: The test principle,equipment,sample preparation, test method and data processing of activated carbon adsorption isotherm at low temperature and low pressure were introduced. The adsorption isotherms of CO2, air, N2, Ar, H2 and He by DX-30 briquette, ZX-15 columnar anthracite and CH-1 coconut shell particles were tested at low pressure of liquid nitrogen temperature.The results show that the adsorption isotherms of activated carbon for CO2, air, N2 and Ar are Langmuir I isotherms, Freundlich isotherms for H2 and concave type Ⅲ isotherms for He. Comparison of adsorption capacity：when the adsorption equilibrium pressure is 10-2Pa, the maximum adsorption capacity of activated carbon for CO2 is (10~120)cm3/g;for N2, air and Ar, the next is (0.2~1.5)cm3/g;for H2, it is only (1.5×10-3~2.3×10-3)cm3/g;for He, it is very weak, and the adsorption equilibrium pressure is less than 3×10-5cm3/g at 10-1Pa.The comprehensive adsorption capacity of the three activated carbons at liquid nitrogen temperature is：DX-30 type is slightly stronger, ZX-15 type is next, CH-1 type is slightly weaker. The adsorption isotherm in this paper can be used as a reference for the design of low temperature adsorption pump and cryogenic vessel.

Key words: cryogenic vessels, cryogenic adsorption pumps, cryogenic adsorbent, activated carbon, adsorption isotherms

CLC Number: 

  • O658.6+2
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