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PSA TSA Ethanol Dedhyration Process Molecular Sieve

Author : Jamie Shaw

Update time : 2020-07-08 11:37:15

Traditional ethanol distillation method:

Vacuum distillation method:
By changing the position of the azeotropic point, as the vacuum increases, the alcohol concentration gradually increases during distillation.
Ternary distillation:
Introduce the third component (benzene, ethylene glycol, cyclohexane, etc.) into the original alcohol water component, among which the most used are benzene and ethylene glycol.

The traditional method has high energy consumption, and some toxic substances will increase the cost and safety risks. Currently, molecular sieve dehydration is widely used internationally.

Advantages of molecular sieve dehydration:
The molecular sieve dehydration method has good effects and mainly has the following advantages:
1. High quality with strong dehydration ability. Ethanol purity can reach max. 99.995% (void fraction) after dehydration.
2. Low energy consumption. The energy consumption is less than 560KJ/L ethanol without considering the comprehensive energy utilization with other processes;
3. Easy operation, the whole process can be controlled automatically;
4. Eco-friendly without pollution, non-toxic.
5. Long lifespan. Up to 5~7 years lifetime under normal operating conditions.

Molecular sieve dehydration methods are divided into liquid phase dehydration and gas phase dehydration.

Molecular sieve liquid phase dehydration: It is also called TSA process. The aqueous ethanol solution exists in the liquid phase during the entire dehydration process. Liquid phase dehydration requires thermal regeneration. The typical thermal dehydration system consists of a double tower system. Tower A adsorption, tower B regeneration. Tower A adsorption time up to 2-8hrs, at the same time, Bed B regenerate molecular sieve through heating, cooling, drainage process. Absorption process switch to Tower B after regeneration and tower A molecular sieve starts regeneration at the same time.

In the TSA process, the molecular sieve bed is usually heated to 230~260°C, and purged with nitrogen gas to remove water.

Molecular sieve gas phase dehydration: It is also called PSA process. Compared with TSA liquid phase dehydration process, energy consumption and cost of PSA process is lower. It is an advanced ethanol dehydration technology.
The PSA process maintains the temperature of the system above 140°C. At this time, the aqueous ethanol is completely vaporized, and the steam enters the PSA device. The dehydration and purification of ethanol vapor is completed through a series of processes such as equalization, adsorption, equalization, decompression, and desorption. The dehydrated ethanol vapor is condensed and recovered. Compared with the TSA device, the moisture content of the PSA device is lower, and only a small amount of water is removed during the desorption process, so the cycle time is shorter.

The Gophin EniSorb-3ED molecular sieve is a molecular sieve designed for alcohol (ethanol) dehydration, which can be used for molecular sieve liquid phase (TSA) and gas phase (PSA) ethanol dehydration.

1. The ENISORB-3ED molecular sieve has large water absorption capacity, high strength, low abrasion, outstanding advantages in adsorption speed and desorption performance, and has a long service life;
2. The ENISORB-3ED molecular sieves are specially used for the dehydration of methanol, ethanol and other polar compounds;
3. Packaging: 150kg sealed steel drum, different packaging can be customized according to customer requirements.

Item		EniSorb-3ED Molecular Sieve
Application		Ethanol, methanol dehydration
Shape		Sphere
Diameter (mesh)		8x12 (1.6-2.5mm)	4x8 (3.0-5.0mm)
Bulk density (g/ml)		≥0.75	≥0.75
Crushing strength (N/pc)		≥40	≥100
Static water adsorption	RH=10%	≥18	≥18
	RH=50%	≥21	≥21
CO2 Adsorption (%)		≤1.0	≤1.0
Loss on Ignition (%)		≤1.5	≤1.5
Wear Ratio (%)		≤0.1	≤0.1
Water content (%)		≤1.5	≤1.5
Package		150kg/drum

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Ms. Jamie Shaw Ms. Jamie Shaw

Ms. Jamie Shaw

Ms. Jamie Shaw Ms. Jamie Shaw Ms. Jamie Shaw