Process for the production of a seed mixture for faujasite synthesis

Claim 2

A process for the production of a seed mixture for faujasite synthesis, comprising reacting amorphous, synthetic sodium aluminum silicate, in the form of a powder or filter cake, with an Na 2 O-supplying compound, selected from the group consisting of sodium hydroxide, sodium silicate and sodium aluminate, in an aqueous system at temperatures of 10° to 35° C. whereby a mixture is obtained having Na 2 O:Al 2 O 3 :SiO 2 :H 2 O in the ratio (12±3):1:(15±3):(240±60) and allowing this mixture to age for at least 24 hours.

Claim 3

The process of claim 1 further comprising aging at 10° to 35° C.

Claim 4

The process according to claim 1, further comprising the amorphous sodium aluminum silicate having the following properties: SiO 2 content: 70-90% (based on anhydrous substance) Al 2 O 3 content: 6-10% (based on anhydrous substance) Na 2 O content: 5-9% (based on anhydrous substance) BET surface area: 50-150 m 2 /g pH value: 10-11.

Claim 5

A process for the synthesis of faujasite comprising first forming a seed mixture by reacting an amorphous, synthetic sodium aluminum silicate, in the form of a powder or filter cake, with an Na 2 O-supplying compound in an aqueous system at a temperature of 10° to 35° C. whereby a mixture is obtained having structural formula: Na 2 O:Al 2 O 3 :SiO 2 :H 2 O=(12±3):1:(15±3):(240±60), permitting said mixture to age for at least 24 hours to thereby obtain a seed mixture and thereafter adding said seed mixture in the amount of 0.5 to 10 volume percent to a faujasite synthesis mixture formed by mixing water, sodium hydroxide, aluminum oxide and silica in sufficient amounts to produce said synthesis mixture, thereby forming a suspension which is heated and crystallized to recover the faujasite product.

Claim 6

A process for the synthesis of faujasite comprising first forming a seed mixture by reacting an amorphous, synthetic sodium aluminum silicate, in the form of a powder or filter cake, with an Na 2 O-supplying compound in an aqueous system at a temperature of 10° to 35° C. whereby a mixture is obtained having structural formula: Na 2 O:Al 2 O 3 :SiO 2 :H 2 O=(12±3):1:(15±3):(240±60), permitting said mixture to age for at least 24 hours to thereby obtain a seed mixture and thereafter adding said seed mixture in the amount of 0.5 to 10 volume percent to a faujasite synthesis mixture formed by mixing water, sodium hydroxide, aluminum oxide and silica in sufficient amounts to produce said synthesis mixture, thereby forming a suspension which is heated and crystallized to recover the faujasite product.

Claim 7

In the process according to claim 4, further comprising in that the faujasite is a zeolite of type X.

Claim 8

The process according to claim 4, further comprising in that faujasite is a zeolite of type Y.

Claim 9

A process according to claim 1, further comprising permitting said mixture to age for at least 24 hours at a temperature of 10° to 35° C.

Claim 10

A seed mixture for faujasite synthesis produced by the method of claim 1.

Claim 11

A seed mixture for faujasite synthesis comprising the formula: Na 2 O:Al 2 O 3 :SiO 2 :H 2 O having the composition (12±3):1:(15±3):(240±60) and having been produced from a Na 2 O suppling compound selected from the group consisting of sodium hydroxide, sodium silicate and sodium aluminate.

Claim 12

A seed mixture for faujasite synthesis comprising the formula: Na 2 O:Al 2 O 3 :SiO 2 :H 2 O having the composition (12±3):1:(15±3):(240±60) and having been produced from a Na 2 O suppling compound selected from the group consisting of sodium hydroxide, sodium silicate and sodium aluminate.

Claim 13

The seed mixture according to claim 9 having been prepared from amorphous sodium aluminum silicate in the form of a powder or a filter cake.

Claim 14

The seed mixture according to claim 10 wherein said silicate has the following properties and wherein the weight amounts are on an anhydrous basis: SiO 2 content: 70-90% Al 2 O 3 content: 6-10% Na 2 O content: 5-9% BET surface area: 50-150 m 2 /g pH value: 10-11.

Claim 15

A process for the production of a seed mixture for faujasite synthesis, comprising mixing water with an Na 2 O supplying compound selected from the group consisting of sodium hydroxide, sodium silicate and sodium aluminate, cooling to room temperature and thereafter adding amorphous sodium aluminum silicate, in the form of a powder or filter cake, at temperatures of 10° to 35° C. wherein a mixture is obtained having the formulation Na 2 O:Al 2 O 3 :SiO 2 :H 2 O=(12±3):1:(15±3):(240±60), permitting this mixture to age for at least 24 hours in order to thereby obtain a seed mixture that shows no tendency toward gelling.

Claim 16

A process for the production of a seed mixture for faujasite synthesis, comprising mixing water with an Na 2 O supplying compound selected from the group consisting of sodium hydroxide, sodium silicate and sodium aluminate, cooling to room temperature and thereafter adding amorphous sodium aluminum silicate, in the form of a powder or filter cake, at temperatures of 10° to 35° C. wherein a mixture is obtained having the formulation Na 2 O:Al 2 O 3 :SiO 2 :H 2 O=(12±3):1:(15±3):(240±60), permitting this mixture to age for at least 24 hours in order to thereby obtain a seed mixture that shows no tendency toward gelling.