Testing apparatus and method for actual high-pressure adsorption kinetics of adsorbent

Abstract

The invention provides a testing apparatus and method for actual high-pressure adsorption kinetics of an adsorbent. The method is a volume method based on an improved static bed test system and comprises four steps, i.e., volume calibration, calibration of a hot zone and a cold zone, leak detection, and testing. According to the method provided by the invention, a pressure gauge in a traditional static bed test system is replaced by a high-sensitivity pressure sensor, and the actual high-pressure adsorption kinetic curve of the adsorbent is obtained through inverse computation based on a curve of changes of pressure in an adsorption pipe along with time, so influence of air inflow rates on testing results in traditional testing methods for kinetics of adsorbents is avoided; the concept of the hot zone and the cold zone and a measuring method are provided so as to reduce calculation errors caused by the dead volume of pipelines and the temperature nonuniformity of the adsorption pipe; and the mass of a sample added into the adsorption pipe is controlled so as to allow pressure drop in the process of measuring to be macroscopically small and microscopically great, so accuracy of calculation results is guaranteed, and pressure is approximately considered to be almost unchanged in the process of adsorption.

Description

technical field

[0001] The invention belongs to the technical field of adsorbent characterization, and in particular relates to an adsorbent real high-pressure adsorption kinetics test device and method. Background technique

[0002] Adsorbent is a solid substance that can effectively absorb certain components in gas, and is widely used in fields that require gas separation and purification, including petroleum, chemical, metallurgy, power generation and other industries. Adsorbents can be divided into normal temperature physical adsorbents (activated carbon, zeolite, silica gel, alumina) according to different conditions of use, normal temperature chemical adsorbents (solid amine, sodium carbonate), medium temperature adsorbents (hydrotalcite, magnesium-based double salt) and high temperature Adsorbent (lithium silicate, lithium zirconate, calcium oxide), etc. The indicators for evaluating the performance of adsorbents mainly include adsorption capacity and adsorption kine...

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