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molecular sieve
molecular sieve

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4A molecular sieve is mainly used to make static dehydration in airtight gas or liquid system, it can remove the moleculars of e

The ZSM-5 molecular sieve is prepared through hydrothermal process by using oxide, oxy-acid, salt or complex containing Al, Ga, B, Fe, Cr, V, Zr or As element as M source; tetracethyl silicate, silica sol or water glass as Si source; and recovered molecular sieve crystalline mother liquor and quaternary ammonium base and/or organic amine as template agent. The ZSM-5 molecular sieve synthesized through process of the present invention has low cost, short synthesis period and high crystallinity as well as high catalytic activity and selectivity. The process also eliminate the pollution of environment caused by wastte mother liquor after crystallization.

Examples of the applications of the differing molecular sieve grades are :
Grade 3A. Dries unsaturated gases and organic liquids (e.g methanol). Used to remove water from cleaning fluids in ultrasonic baths.
Grade 4A. Is a general dryer of liquids, natural gases. Also an excellent adsorber of carbon dioxide.
Grade 13X. Is used in air prepurification (due to its high water and carbon dioxide adsorption capacity) and also adsorbs sulphur compounds ('sweetens'). It will remove decomposition products following the quenching of arcing in electrical products.

Molecular sieves properties as desiccants differ from silica gel in a number of ways :
(1) They adsorb water vapour more rapidly than silica gel.
(2) They will reduce water vapour to much lower levels than silica gel, making their use essential when a very dry product or atmosphere is required. 
(3) They perform more effectively as moisture adsorbers at higher temperatures (greater than 25°C) than silica gel does.

We can product the following molecular sieve products: 3A, 4A, 5A, and 13X molecular sieve.

Molecular Sieve Technical Parameters

Item

Particle Dia.(mm)

Equilibrium H2OCapacity(%)

Compression Strength(N/n)

Bulk Density
(Kg/L)

Abrasion Wear Quality(%)

Water Content(%)

3A

ø 2 - 3

20

44

0.68

< 0.4

< 1.5

ø 3 - 5

59

ø 5 - 8

60

0.65

3.5x5x10

> 20 N/mm

< 0.6

4A

ø 2 - 3

21.5

30

0.66

< 0.2

ø 3 - 5

70

ø 5 - 8

80

0.68

< 0.1

3.5x5x10

20.5

> 18 N/mm

0.66

< 0.4

5A

ø 2 - 3

20

30

0.66

< 0.2

ø 3 - 5

60

ø 5 - 8

67

0.68

< 0.1

3.5x5x10

> 17 N/mm

0.64

< 0.4

13X

ø 2 - 3

23.5

25

0.64

< 0.1

ø 3 - 5

65

ø 5 - 8

80

0.65

3.5x5x10

23

> 18 N/mm

< 0.2

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