Dixon Rings Packing Theta Ring Packing

The theta ring packing, also known as Dixon packing or Θ ring packing, is a widely used packing material in chemical towers. All theta rings are handcrafted and have excellent capillary effect and extremely high efficiency. The theta ring packing is a small particle packing made of metal wire mesh. Due to its unique mesh structure, the theta ring packing can provide a large specific surface area, which is conducive to the contact and transfer between gas and liquid...

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The corrugated plate arrangement of the Sita ring packing enables the gas flow to pass through smoothly, reducing the flow resistance and thereby lowering the pressure drop inside the tower. Its large channel structure ensures that the Sita ring packing maintains good performance when handling high-flow gases. Made of materials such as metal or plastic, it can be customized as needed and is easy to install and maintain. It is mainly used in laboratory and small-scale, high-purity product separation processes, as well as the development of isotopes, etc. This ring was created by British scientist Dr. Dixon in 1947, so it is named after him - Dixon packing.

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Theta ring packing, also known as Dixon packing, is a type of high - efficiency annular packing made of metal wire mesh, with its diameter equal to its height. Common specifications include 2×2, 3×3, 4×4, 5×5, 6×6, 7×7, 8×8, 9×9, 10×10, 11×11, 12×12 (unit: mm), etc. It comes in two forms: single - layer and double - layer. Generally, those with a size of 5×5 or larger will adopt the double - layer form to achieve better mechanical performance and separation effect. Its main materials are 304 and 316L, and other materials can also be customized according to special needs.

Theta ring packing has the characteristics of good mass transfer effect, high plate efficiency and convenient filling. It is mainly used in laboratories and the separation process of small - batch, high - purity products. When selecting theta ring packing, the rough index can usually be 1/8 or 1/10 of the tower diameter. The following is a table of some specification parameters:

Packing Specification (mm)
Mesh
Suitable Tower Diameter (mm)
Number of Theoretical Plates (plates/m)
Bulk Density (g/L)
Specific Surface Area (m²/m³)
Porosity (%)
Pressure Drop (mbar/m)
Φ2×2
100
Φ10 - Φ20
60 - 65
680
3700
91
30
Φ3×3
100
Φ25 - Φ40
50 - 55
450
2800
93
15
Φ4×4
65
Φ40 - Φ70
30 - 32
400
1700
95
10
Φ5×5
60
Φ50 - Φ70
15 - 20
400
1100
95
10
Φ6×6
60
Φ60 - Φ80
12 - 15
340
950
95
10
Φ8×8
60
Φ70 - Φ90
10 - 12
275
750
95
8
Φ10×10
60
Φ100 - Φ1200
7 - 8
200
550
95
8

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Packing Specification (mm)	Mesh	Suitable Tower Diameter (mm)	Number of Theoretical Plates (plates/m)	Bulk Density (g/L)	Specific Surface Area (m²/m³)	Porosity (%)	Pressure Drop (mbar/m)
Φ2×2	100	Φ10 - Φ20	60 - 65	680	3700	91	30
Φ3×3	100	Φ25 - Φ40	50 - 55	450	2800	93	15
Φ4×4	65	Φ40 - Φ70	30 - 32	400	1700	95	10
Φ5×5	60	Φ50 - Φ70	15 - 20	400	1100	95	10
Φ6×6	60	Φ60 - Φ80	12 - 15	340	950	95	10
Φ8×8	60	Φ70 - Φ90	10 - 12	275	750	95	8
Φ10×10	60	Φ100 - Φ1200	7 - 8	200	550	95	8