Adsorption principle of molecular sieve and copper catalyst in glove box
Molecular sieve is an artificial hydrothermal synthesis of silicate-aluminium crystals, which has a uniform pore size distribution. Depending on the size of the pores inside the crystal, molecular sieve can adsorb or repel different substance molecules. At the same time, according to the polarity or polarisability of different substance molecules, the order of adsorption is determined, so as to achieve the effect of separation. For example, in the glove box, the molecular sieve is mainly used to adsorb moisture, and its strong adsorption capacity can effectively reduce the moisture content of the gas inside the box.
Copper catalyst is mainly through the chemical reaction with oxygen to achieve the purpose of oxygen removal. In the gas purification process of the glove box, the high activity of the copper catalyst enables it to quickly react with oxygen and remove oxygen from the gas.
Different brands of glove box on the molecular sieve and copper catalyst dosage differences
The amount of molecular sieve and copper catalyst used in gloveboxes varies between brands and models. For example, the amount of copper catalyst and molecular sieve used in the purification columns of gloveboxes manufactured by Etex Inert Gas Systems (Beijing Co., Ltd.) may vary. Some columns contain approximately 4.5kg of copper catalyst and 4.5kg of molecular sieve, some contain 5kg of copper catalyst and 5kg of molecular sieve, and some contain 75kg of copper catalyst and 75kg of molecular sieve. these variations can be influenced by a variety of factors such as the specification of the glove box, performance requirements, and design concept.
Glove box purification material regeneration method
Glove box operation for a period of time, the purification material will appear saturated phenomenon, adsorption of water and oxygen capacity decline, this time it is necessary to regenerate it. Regeneration needs to meet certain conditions, such as the need to regenerate the purification column has stopped circulation, open the vacuum pump, the box pressure is set to the “default value”, the box of water and oxygen content of <200ppm and so on.
The regeneration gas is usually a mixture of hydrogen and inert gas (5%-10% hydrogen). Specific steps include: prepare a bottle of regenerative gas and a bottle of high-purity argon, regeneration cylinder pressure reducing valve connected to the “regenerative gas” interface, argon bottle pressure reducing valve connected to the “working gas” interface, the exhaust pipe to the outside; close the cycle (vacuum pump on), and all others are off! If the “regeneration” button does not work, you need to enter the password to operate. Regeneration process is divided into three sections (about 24 hours), the first three hours for the purification column heating, from the third hour to start for the purification column ventilation, exhaust, after the release of regeneration gas, open the “working gas” interface with the decompression valve, point the touch screen on the “cycle”, regeneration is complete! The glove box can be used normally after one day of recirculation.
Evaluation of the effect of molecular sieve and copper catalyst in glove box purification
Molecular sieve and copper catalyst play an important role in the gas purification process of the glove box. The molecular sieve adsorbs moisture efficiently and reduces the moisture content in the gas to a very low level, providing a dry environment for experiments and production. Copper catalysts effectively remove oxygen, ensuring that the gas inside the chamber is oxygen-free. For example, in some high-precision experiments and production, the excellent purification effect of molecular sieves and copper catalysts can ensure that the materials are free from moisture and oxygen, thus improving the quality of products and the accuracy of experiments.
Molecular sieves and copper catalysts are mentioned as purification materials in several search results for glove boxes. For example, in some glovebox configurations, the purification material within the purification column comprises a copper catalyst and a molecular sieve, wherein the copper catalyst is primarily used to remove oxygen and the molecular sieve is primarily used to remove water. The specific dosage varies, such as about 4.5kg of copper catalyst and 4.5kg of molecular sieve in some purification columns; 5kg of copper catalyst and 5kg of molecular sieve in some purification columns; and 75kg of copper catalyst and 75kg of molecular sieve in some purification columns.
The use of purification materials may vary between glovebox brands and models. For example, copper catalyst and molecular sieve are used as decontamination materials in glove boxes manufactured by Etex Inert Gas Systems (Beijing Co., Ltd.). In the purification system of some glove boxes, the gas, under the action of a circulating fan, enters the purification column of the gas circulation system, in which moisture and oxygen are removed by molecular sieves and copper catalysts, respectively. When the purification column is saturated with adsorption, it can be regenerated with hydrogen-containing nitrogen or argon to restore its adsorption capacity.
In short, the molecular sieve and copper catalyst in the glove box gas purification process plays an important role, can effectively remove the water and oxygen in the box gas, for the experiment and production to provide a water-free and oxygen-free environment.
