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4A zeolite

4A zeolite: chemical formula is Na12AL12Si12O48 · 27H2O, is made of silica and alumina tetrahedron formed three-dimensional skeleton structure compounds, belongs to cubic unit cell center, is a 1.14A diameter hole, which is composed of a 8 membered ring and 6 similar hole connected together, the 8 membered ring structure formation free hole diameter of 4.12A, called 4A zeolite.The traditional synthesis method of water glass method, activated clay, bentonite, kaolin process method and coal gangue method.Water glass process technology is mature, easy to control, but the cost is high.Activated clay and bentonite by adding aluminum source, high cost, and the equipment corrosion.Kaolin process and coal gangue is a method using the ratio of aluminum to silicon and 4A zeolite consistent characteristics, transforming it into reactive metakaolin, and in caustic soda solution by hydrothermal crystallization reaction and made of zeolite, but this process requires high temperature roasting of raw ore, energy loss, at the same time, the environment will also have a certain degree of pollution.
　　It is a non-toxic, odorless, tasteless and good flowing white powder, has strong calcium ion exchange capacity, no pollution to the environment, is the replacement of sodium tripolyphosphate ideal phosphate-free detergent additives, surface adsorption ability, is the ideal adsorbent and desiccant.Nature: also known as Na12[(A1O2) 12, (SiO2) 12]27H2O called the 4A molecular sieve.The white solid particles.Network-like structure, with uniform pores, pore diameter of 0.42nm, specific surface area of about 600m2/R, insoluble in water and organic solvents, soluble in alkali and acid.Heated above 800 ℃, recrystallized white silica shaped structure.Adsorption moisture, liquids, gases and unsaturated organic matter.On calcium ion exchange capacity, theoretical exchange capacity for 352CaCO3mg/g, generally 290 ~ 320mgCaCO3/g, whiteness ≥ 95%, pH value was 10 ～ 11.5, the apparent density of from 0.3 to 0.5g/cm3, average particle size of 2 μ m, the size distribution of ≤ 4 μ m accounted for more than 85%.Used as a non-phosphorus detergent additives, instead of sodium tripolyphosphate; in petroleum and other industry as a gas and liquid drying, dehydration, also used as a catalyst and water softener.
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