Introduction
Molecular sieving static water adsorption is an effective method used to measure the concentrated distribution width of petroleum and its products. It is a very important physical property because it is related to the thermodynamic properties of petroleum and its products. The method involves the adsorption of a liquid on a molecular sieve, and the static water adsorption value is determined using the static, unrefined method. Basically, petroleum, oil, gas and products are placed in a dry tube, vacuum sealed for a certain period of time, and the static water adsorption value is the amount of water adsorbed on the molecular sieve.
Theory
Molecular sieve bitumen is composed of an organic amine containing an unsaturated carbon-hydrogen bond, a hydrocarbon molecule and a sieve molecule. When the molecular sieve and petroleum are placed in contact, the unsaturated carbon-hydrogen bond attracts the hydrocarbon and binds it to the molecular sieve. The amount of hydrocarbon that can be bound to the molecular sieve and the capacity of the molecular sieve are the basis for determining the water adsorption capacity.
In the molecular sieving static water adsorption method, the molecular sieve is pre-soaked in a test tube in order to avoid any unpredictable and uncontrolled changes in the properties of the sieve caused by water or other substances in the environment, and then the test tube is purged with nitrogen or carbon oxide for 20 to 30 minutes in order to keep the tube dry and reduce the ambient humidity.
Then, the petroleum and its products to be tested are added to the test tube, the test tube is sealed, and the temperature of the sample is regulated to a constant temperature in the range of 10-50-C according to the test conditions. After the sample is heated, the water in the sample is adsorbed by the molecular sieve and the water adsorption capacity of the molecular sieve is determined.
Application
Molecular sieving static water adsorption method is used to measure the determination of petroleum and its products water adsorption activity, which is a very regular physical property related to the thermodynamic properties of petroleum and its products. The specific application scope includes their kinematic viscosity, surface tension, boiling point and thermal conductivity.
The molecular sieving static water adsorption method is an ideal method for determining petroleum and its products water adsorption capacity because it is non-destructive, does not interfere with the sample and does not require a large sample size. It is also simple to operate. In addition, the method has high test efficiency and high accuracy. It is suitable for the determination of petroleum, oil, gas and related products with different boiling points, and also for the determination of the water adsorption capacity of oils and greases.
Conclusion
Molecular sieving static water adsorption is an important physical property of petroleum and its products and is used to measure a variety of thermodynamic properties. The petroleum and its products to be tested are placed in a vacuum-sealed test tube at a constant temperature, and the water adsorption capacity is determined by the amount of water adsorbed by the molecular sieve. The method has the advantages of non-destructive, simple operation, accurate and reliable results, high efficient test requirements and wide application scope. The molecular sieving static water adsorption method is the ideal method for determining water adsorption activity.
