Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
279 words
A process of preparing a crystalline zeolite powder of Type A with the composition: 1.0±0.2 M.sub.2/n O:Al.sub.2 O.sub.3 :1.85±0.5SiO.sub.2 ·y H.sub.2 O where M is a sodium cation, n is its valence and y has a value up to 6 with 50 weight % of the particles not over 6.2μ and with a particle spectrum ______________________________________
Fraction (μ) Portion (weight %)
______________________________________
<3 10 to 60
<5 25 to 95
<10 80 to 99
<15 92 to 100
______________________________________ comprising hydrothermally crystallizing a SiO 2 , Al 2 O 3 , M 2 O and water containing alkali aluminate, water, alkali silicate synthesis mixture where M is sodium, said process including the steps of providing an aqueous sodium aluminate liquor having a temperature of 50° to 90° C. and containing 0.1 to 100 grams of Al 2 O 3 /l and 1 to 200 grams of Na 2 O/l, feeding in with stirring sodium silicate solution containing 50 to 150 grams of Na 2 O/l and 200 grams to 450 grams of SiO 2 /l to form a turbid reaction mixture having the composition SiO 2 /Al 2 O 3 =2 to 50:1, Na 2 O/SiO 2 =0.2 to 20:1 and H 2 O/Na 2 O=4 to 300:1, adding with stirring in two steps, with the second step being at a higher rate, an aqueous sodium aluminate which contains 10 to 200 grams/l of Al 2 O 3 and 10 to 250 grams/l of Na 2 O and having a temperature of 10° to 100° C. and allowing the thus obtained synthesis mixture to crystallize at a temperature within between 20° and 175° C. for at least 15 minutes.
Claim 2
Dependent Claim
279 words
A process of preparing a crystalline zeolite powder of Type A with the composition: 1.0±0.2 M.sub.2/n O:Al.sub.2 O.sub.3 :1.85±0.5SiO.sub.2 ·y H.sub.2 O where M is a sodium cation, n is its valence and y has a value up to 6 with 50 weight % of the particles not over 6.2μ and with a particle spectrum ______________________________________
Fraction (μ) Portion (weight %)
______________________________________
<3 10 to 60
<5 25 to 95
<10 80 to 99
<15 92 to 100
______________________________________ comprising hydrothermally crystallizing a SiO 2 , Al 2 O 3 , M 2 O and water containing alkali aluminate, water, alkali silicate synthesis mixture where M is sodium, said process including the steps of providing an aqueous sodium aluminate liquor having a temperature of 50° to 90° C. and containing 0.1 to 100 grams of Al 2 O 3 /l and 1 to 200 grams of Na 2 O/l, feeding in with stirring sodium silicate solution containing 50 to 150 grams of Na 2 O/l and 200 grams to 450 grams of SiO 2 /l to form a turbid reaction mixture having the composition SiO 2 /Al 2 O 3 =2 to 50:1, Na 2 O/SiO 2 =0.2 to 20:1 and H 2 O/Na 2 O=4 to 300:1, adding with stirring in two steps, with the second step being at a higher rate, an aqueous sodium aluminate which contains 10 to 200 grams/l of Al 2 O 3 and 10 to 250 grams/l of Na 2 O and having a temperature of 10° to 100° C. and allowing the thus obtained synthesis mixture to crystallize at a temperature within between 20° and 175° C. for at least 15 minutes.
Claim 3
Dependent Claim
31 words
A process according to claim 1 wherein the speed of addition of the added sodium aluminate in the second step is 2 to 10 times higher than in the first step.
Claim 4
Dependent Claim
13 words
A process according to claim 2 including a tempering step after the crystallization.
Claim 5
Dependent Claim
44 words
A process according to claim 2 wherein 10% of the aqueous sodium aluminate is added in the first step and 90% is added in the second step, the rate of addition in the second step being 2 11/35 times that in the first step.
Claim 6
Dependent Claim
26 words
A process according to claim 2 wherein a tempering step at 85° to 105° C. for 0.2 to 6 hours is carried out after the crystallization.
Claim 7
Dependent Claim
17 words
A process according to claim 5 wherein the crystallization is carried out at 90° to 100° C.
Claim 8
Dependent Claim
17 words
A process according to claim 14 wherein the crystallization is carried out at 90° to 100° C.
Claim 9
Dependent Claim
149 words
A process according to claim 2 wherein there are initially present at a temperature of 70° C. in the tank 500 liters of aqueous sodium aluminate containing 77 grams/l of Na 2 O and 6 grams/l of Al 2 O 3 , there is fed in at 20° C. within 20 minutes 300 liters of waterglass containing 7.4% Na 2 O and 25.5% SiO 2 to form a turbid solution having a temperature of 60° C. and the aqueous sodium aluminate is added to the synthesis mixture in two steps with 100 liters having a temperature of 70° C. being added in 18 minutes and then a further 900 liters of the same aqueous sodium aluminate solution having a temperature of 85° C. being added in 70 minutes, the added aqueous sodium aluminate containing 161 grams/l of Na 2 O and 105 grams/l of Al 2 O 3 .
Claim 10
Dependent Claim
13 words
A process according to claim 2 consisting essentially of the steps set forth.