Raschig ring is the earliest developed random packing, named after the German chemist Friedrich Raschig. It's small tube cutting, which outside diameter is equal to its height, providing a surface for (re)evaporation of the most volatile part in the refluxing distillate, typically 10 mm in diameter and 12 mm long.

It's used in commercial fractional distillation towers to reduce pressure loss (versus using trays), while maintaining good efficiency and economy. Typically the change in pressure (also called "delta p") is lower than in the case of trays but slightly higher than for structured packing.

With the characters of high mechanical strength, high chemical stability, and excellent heat endurance, Ceramic Raschig Ring can resist high temperature, acid (except HF), alkali, salt and various organic solvents. It's widely applied in various packing towers of desiccation, absorption, cooling, washing, and regeneration in industries of petrochemical, chemical, metallurgy, gas and oxygen generation.

For raschig ring with big size over 100mm, it's usually filled in the column orderly. If its size is less than 90mm, raschig ring is stacked in the column randomly.

Spec, mm

D*H*T, mm

Surface area, m2/m3

Free volume, %

Number per m3

Bulk density, Kg/m3

Dry Packing Factor, m^-1

Φ 6

6*6*2

789

73

3110000

737

2030

Φ 10

10*10*2

440

70

720000

700

1280

Φ 15

15*15*2

330

70

250000

690

960

Φ 16

16*16*2

305

73

192500

730

784

Φ 25

25*25*2.5

190

78

49000

505

400

Φ 40

40*40*5

126

75

12700

577

305

Φ 50

50*50*5

93

81

6000

457

177

Φ 80

80*80*9.5

90

68

1910

714

234

Φ 100

100*100*10

70

70

1000

700

172

Φ 150

150*150*15

50

68

295

790

142