Carbon molecular sieve works

Carbon molecular sieve nitrogen equipment works: carbon molecular sieve nitrogen equipment (CMS-PSA) is a carbon molecular sieve (Carbon Molecular Sieving, abbreviated CMS) as adsorbent and air as raw material, the use of pressure swing adsorption principle of the separation of oxygen and nitrogen production of high pure nitrogen gas separation apparatus.
zeolite 3a molecular sieve for ethanol drying is based on coal as the main raw material selection, grinding, shaping, drying and activation, heat treatment and other processes from the surface is full and efficient non-polar microporous adsorbent. His ability to adsorb gas molecules of different molecular weights are different, and different kinetic diameter of the gas molecules are adsorbed in the hollow glass desiccant molecular sieve pore diffusion at different speeds.
Carbon molecular sieve oxygen and nitrogen co-adsorption exists, at the same adsorption pressure, oxygen, nitrogen adsorption equilibrium was no significant difference (Figure 3) Therefore, the mere change in pressure is difficult to achieve effective separation of oxygen and nitrogen.
The general nature of oxygen and nitrogen, although the difference is small, but its dynamics are different diameters: 3.5 angstroms oxygen, nitrogen is 3.7 angstroms. Although both small pore size than the carbon molecular sieve, but the rate of diffusion of oxygen molecules hundreds of times faster than nitrogen molecules. This is because the smaller the molecule, the faster its diffusion. 4, in a short time, because the rate of diffusion of oxygen molecules than nitrogen molecules, so the oxygen molecules preferentially occupy the center is a large number of molecular sieve dehydration, adsorption capacity after a few minutes to more than 90%, almost close to balance at a time when the amount of nitrogen adsorption of only about 5%. The use of oxygen, nitrogen adsorption difference within a short time of great features, the program controller at a specific time program between two identical adsorption tower fast switching, combined with pressurized oxygen adsorption and desorption of oxygen pressure swing The adsorption process separating oxygen from air. Oxygen-containing gas is discharged from the bottom of the column, nitrogen adsorption due to little or no adsorption in the gas phase and the product gas is enriched in the form of continuous output.

Why molecular sieve at room temperature does not produce water desorption

ethanol dehydration molecular sieve adsorption of water is adsorbed by the van der Waals force, from the microscopic point of view internal pore molecular sieve to reach static equilibrium, the water molecules are polar molecules break down into hydrogen ions and hydroxide ions. In the adsorption process of water molecules in the double glazing molecular sieve with water decomposition of hydrogen ions and hydroxide ions again to reach static equilibrium, pull off the oxygen-hydrogen releases energy (temperature rise phenomenon). The whole process is the physical reaction. Thus Adsorbent Molecular Sieve Kdhf-03 at room temperature does not produce water desorption.

What is the molecular sieve for insulating glass:

Molecular sieve insulating glass all comply with performance indicators and do not have any impact on their physical and chemical properties, only qualified called double glass desiccant molecular sieve for insulating glass. Meet this requirement only Automobile Desiccation Molecular Sieve.

Features of Molecular sieve absorption

activating molecular sieves capacity is very strong (and therefore is widely used as a desiccant), for gas purification, save should avoid direct exposure to the air.Stored for a long time and have moisture absorption regeneration of zeolite molecular sieves should be carried out before use.Molecular sieve avoiding oil and liquid water.Should be used as far as possible avoid contact with oils and liquid water.Drying in production of industrial gases, air, hydrogen, oxygen, nitrogen, argon and so on.Adsorption dryer with two parallel, a job, while the other can be regenerated.Alternating work and regeneration, to ensure a continuous operation.Dryers at 8-12 work under impact regeneration in a heated to 350 degrees.molecular sieve manufacturers regeneration temperature is slightly different in different specifications.Certain organic molecular sieves for gas-phase has a good catalyst.Also known as zeolites and zeolite, is a crystalline aluminosilicate, structured and uniform pores in its crystal structure, molecular size of aperture for

Molecular sieve

Due to contains electric price lower and ion RADIUS larger of metal ion and combined state of water, water molecular in heating Hou continuous to lost, but Crystal skeleton structure not variable, formed has many size same of empty cavity, double glazing molecular sieve empty cavity and has many diameter same of micro-hole connected, these tiny of cavities diameter size uniform, can put than channel diameter small of molecular adsorption to cavities of internal in the to, and put than channel big of molecular exclusion out, thus can put shape diameter size different of molecular, polar degree different of molecular, boiling point different of molecular, Saturation level separating different zeolite 3a molecular sieve  that is, with "screening" molecular function, it is called molecular sieve.Current molecular sieves in the metallurgical, chemical, electronics, petrochemicals, natural gas is widely used in the industry.

Determination of the true density and apparent molecular sieve catalyst density

Determination of true density, commonly used nitrogen replacement method in a vacuum adsorption capacity device. Atmosphere can enter all the pores of the sample itself is rarely to be adsorbed, without chemical change, is the ideal replacement media. If nitrogen is not readily available, nor require very strict, the organic liquid or water may be used in place of benzene, isopropanol and the like. These alternative molecular substances can only allow them to enter the cross section of a molecule into the pores, but can not enter all the pores of the sample, so had an approximate density side is the matrix density, i.e., apparent density Pa.
Isopropyl drunk fluidized catalyst for dehydration of ethanol replacement method is more commonly used measurement method Pa. This method has been recommended Weld density bottle and a feeding device with a capillary stopper. Pre-test sample with water and isopropyl alcohol in the side of the density of a given temperature correction ju bottles. After the sample is added to the density of the bottle, said the quality of the sample, and then pull the plug capillary tube. The density of the bottle mouth set in the ground on the charging device following grinding mouth tube, evacuated, while adding isopropyl drunk part in a test tube feeding device. When the pressure is less than the sample Ou on "133. 322P. When the rotary piston, so slowly adding isopropanol sample, then put the new capillary density injustice bottle stopper, at a given temperature side after weighing balance. According to these mass and temperature of the water at the side of a given density,
Hue grain density meter is filled with mercury, although the determination of the appropriate, measured before first checking for leaks glass piston. After the first six piston pump is turned on, open the piston 4 is evacuated for some time, with 7 mercury pressure gauge to check the connection of the piston vacuum. Once confirmed the formation of a vacuum, and then close the piston 4 and 7. 6 rotary piston slowly into the atmosphere after the pump stops. Slowly open space filled with mercury piston 3 2, closed when the mercury rose to the surface of the piston 4 position 3, this time on the left to read the calibration tube demand side of the piston Liu, set V1 (MI.), And then put through the piston 4 into the atmosphere. Open the piston 3, so that the mercury level drops. When the lid 5 open mill, into the weighed sample grain sheet, as before re-operation. Read volume V3 (mL), mercury surface down to the proper position, the piston 3 to close and open the cover 5 day wear, Samples were taken with a teaspoon.

Factors affecting the molecular sieve catalyst Hang crushing strength

Jing and zeolite catalytic factors affect the mechanical strength of the lot. Their chemical composition determines the aggregate or cohesion within the crystal, i.e. tensile strength. It is the inherent strength of the product. Usually there is a rough relationship between the inorganic solids usually strength and hardness to their melting point. A low melting point with the body has a low strength and hardness, and high melting point by its high hardness and strength.
First, the product prepared by a different mountain. Surface contact points produce a different space structure, defects and grain powder room, etc. whip, which naturally also affect its mechanical strength.
Second. The mechanical strength of the product will occur in use changes, such as the reaction was adsorbed on the solid surface. Generally reduces its mechanical strength, which is - during the reaction to promote the catalytic cracking Xia Jing and ethanol dehydration molecular sieve to Factors. Further use of the time and temperature will affect its mechanical strength.
Hang crushing strength in the industry and the size of the zeolite catalytic Jing direct impact on their effectiveness in working conditions and life. If Hang crush strength is too small. It may break or powdering during use, which not only shortens the molecular cry, catalyst life. But also lead to uneven distribution of sulfur donors, blocking game system to increase bed resistance, Estrogen can cause severe security risk and even forced to stop.