Alloy tubes are used to separate hydrogen from impurities.
The principle of hydrogen purification in the palladium tube is that at 300-500 ° C, when the hydrogen to be purified is passed into the side of the palladium tube, hydrogen is adsorbed on the wall of the palladium tube. Due to the lack of two electrons in the 4d electron layer of palladium, it can generate unstable chemical bonds with hydrogen (this reaction between palladium and hydrogen is reversible). Under the action of palladium, hydrogen is ionized into protons with a radius of 1.5×1015m. The lattice constant of palladium is 3.88×10-10m (20℃), so through the palladium tube, under the action of palladium, protons and electrons combine and re-form hydrogen molecules, and escape from the other side of the palladium tube. On the surface of the palladium tube, the undissociated gas is impenetrable, so the palladium tube can be used to obtain high purity hydrogen. Although palladium has a unique ability to penetrate hydrogen
Alloy pipe
Pure palladium has poor mechanical properties, easy oxidation at high temperature, low recrystallization temperature, easy deformation and embrittlement of palladium tube, so pure palladium can not be used as a transmission film. The mechanical properties of palladium can be improved by adding appropriate amount of Group IB and Group Ⅷ elements to palladium to make palladium alloy. Seamless steel pipe (GB3088-82) is a high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipe palladium alloy, silver accounts for about 20-30%, and the content of other components (such as gold, etc.) is < 5%.
In the palladium alloys currently used, silver accounts for about 20-30%, and the content of other components (such as gold, etc.) is < 5%. The rate of hydrogen passing through the palladium alloy is related to temperature, film thickness and the pressure difference (P) between raw hydrogen and pure hydrogen on both sides of the permeation. Increasing the temperature, increasing P and decreasing the thickness of the film will increase the hydrogen penetration rate. However, the tensile strength of permeable membrane decreases with the increase of temperature. Therefore, the use of palladium tube temperature is usually controlled at about 450 ° C. Some impurities can lead to palladium poisoning, which can impair the permeability and even destroy the membrane. Palladium poisoning can be caused by mercury, arsenide, halide, oil vapor, sulfur and ammonia substances and dust. Palladium alloys can be made into tubes (called palladium tubes) or membranes (called palladium films).
ABS alloy pipe and special cold melt adhesive is one of them widely used in building water supply and central air conditioning, especially in building water supply riser and central air conditioning pipe application. PC/ABS alloy can also be made of automotive exterior parts, such as car wheel covers, mirror shells, tail lamp covers, etc. PC/ABS has good formability and can process large automotive parts, such as car fenders.
As an important part of iron and steel products, steel pipe is divided into seamless steel pipe (round blank) and welded steel pipe (plate, with blank) because of its manufacturing process and the shape of the blank used.
The principle of purifying hydrogen in a palladium tube is that when the hydrogen to be purified is passed into one side of the palladium tube at 300-500 ° C, the hydrogen is adsorbed on the wall of the palladium tube because palladium lacks two electrons in its 4d electron shell, it can form an unstable chemical bond with hydrogen (this reaction between palladium and hydrogen is reversible) under the action of palladium.
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