Density determination of molecular sieve stacking
The density of molecular sieves, which is an important physical property, is closely related to the quality of the product, and it is also a very important index for the characterization and evaluation of molecular sieves. At present, the determination of molecular sieve stacking density is mainly based on GB 6286-86. This article explains the principles and factors that should be paid attention to in the determination of the stacking density of molecular sieves according to the relevant requirements of corresponding standards.
Molecular sieve stacking density is the ratio of the mass of a certain amount of molecular sieve to the volume of the molecular sieve after test. It is usually expressed as kg / m3 (kilograms per cubic meter) or g / cm3 (grams per cubic centimeter). Its determination should meet the following requirements:
1.The design of the sampling device can meet the special needs of the sample.
2.The record after the test should be complete and accurate.
3.Fully reflect the physical pore size characteristics and physicochemical properties of the sample.
4.Suitable for industrial mass production.
The principle of determination of molecular sieve stacking density
The determination of the stacking density of molecular sieves is mainly determined by using the sample taken in a special sampling device, and weighting and measuring the volume of the sample after testing. The principle is based on Archimedes principle: the weight of the immersed object is equal to the weight of the substracted liquid. In the determination, the sample taken in the special sampling device is placed in the water tank, and then the sank sample is removed. After weighing, the volume of the sample is measured and then the stacking density is calculated.
The factors affecting the determination of the stacking density of molecular sieves
1. Sample taking
The sampling and taking of the sample should be carried out in accordance with the relevant provisions of relevant standards. In the sampling process, it is necessary to ensure that the sample taken has a certain size and volume.
2. Sample protection
In the process of taking samples, it is necessary to pay attention to the protection of the sample. Avoiding physical and chemical damage to the sample, in order to ensure the accuracy and reliability of the data.
3. Sample testing
The testing process is also an important part of the determination of molecular sieve stacking density. The weighing and measuring of the sample should be carried out accurately, and the measuring method should be consistent.
Conclusion
The determination of molecular sieve stacking density can accurately and reliably reflect the physical pore size characteristics of the sample and reflect the quality of the sample to a certain extent. For the determination, attention should be paid to the sampling, testing and protection of the samples, and the experiment should be performed in strict accordance with the relevant provisions of the corresponding standards.
