1. Introduction
For the active alumina, there are such varied merits, for instance, the properties of absorption, catalytic activation, porous, higher dispersion, and larger specific surface areas etc. It adapts to the drying of many gases and liquids, Further, it can be applied to as the absorbents, drying agents, catalysts, and carriers during many reactions in the fields of the petroleum, chemical fertilizer, and chemical industry.

2. Types of product
For the active alumina, there areγand X-P assortments according to the inner main crystal phase.
In accordance with the usage, it can be divided into the active alumina absorbent, the active alumina drying agent, and the active alumina catalyst carrier.

3. Physical and chemical properties

Variety     Property		Active alumina absorbent				Active alumina drying agent			Active alumina catalyst carrier
		Normal		High strength		Normal	Air separation
Crystal phase		γType				X-P Type			γType
Chemical composit-ions, ％	AL2O3	≥92			≥93	≥90			≥95
	Na2O	≤0.3
	Other	6-8			＜10				＜5
Physical properties	Outward size, mm	Ø2-3 Ø3-5 Ø4-6			5-8	Ø2-3 Ø3-5 Ø4-6			Ø2-3 Ø3-5 Ø4-6
	Specific surface areas, .m2/g	≥300		300-325		≥300	350±20		200-400
	Pore volume, ml/g	≥0.35		≥0.5		0.4±0.05	0.4±0.03		200-400
	Static water sorption,％	≥15		17-19		≥15	≥19		≥28
	Bulk density, g/ml	0.68-0.72			0.74-0.77	0.68-0.72
	Abrasion ratio, ％	≤0.4
	Point crushing strength,	Ø2-3	≥70		222-311	Ø2-3		≥70	Ø2-3	≥70
		Ø3-5	≥100			Ø3-5		≥100	Ø3-5	≥100
		Ø4-6	≥100			Ø4-6		≥100	Ø4-6	≥100