When should I consider switching from 4A to 3A molecular sieve?

When should I consider switching from 4A to 3A molecular sieve?

There are several advantages with use of 3A sieve that can potentially benefit the plant operation. 3A sieve is essentially a drop in replacement that gives the same or better performancethan 4A sieve in many applications. Only very small compounds such as ammonia and water easily pass through the 3A crystal pore openings for adsorption. If adsorption of other contaminants such as sulfur, CO2, and oxygenates is a concern, the 3A sieve minimizes co-adsorption of these compounds and helps maintain constant and stable levels of these contaminants in the product and regeneration streams, avoiding spikes and problematic levels. 3A sieve also regenerates more thoroughly at lower temperatureswith a typical target of 450°F (232°C). This saves energy and minimizes carbon laydown/coking. During each regeneration heating cycle, a small amount of carbon/coke is deposited on the sieve and over time, it causes adsorption capacity decline. Minimizing this thus helps to achieve longer sieve life.

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