US5300138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Langmuir moderate type 1 desiccant mixture for air treatment
Assignee: Semco Inc
•
Filing: 1993-01-21
•
Granted: 1994-04-05
•
Expires: 2013-01-21
Abstract
Abstract A desiccant composition having a moderate Langmuir Type 1 moisture adsorption isotherm with a separation factor of from 0.05 to 0.13 is disclosed. The composition contains silica gel, a modified 13* molecular sieve (modified by replacing at least 20% of the sodium cations with other metallic cations, e.g., potassium cations), and desirably a hydrophobic adsorbent (desirably a hydrophobic molecular sieve). The composition may be used as the desiccant in a rotary regeneratable dehumidification wheel, thereby significantly enhancing dehumidification performance and simultaneously removing a significant proportion of the airborne pollutants typically contained in indoor and outdoor air.
Inventors
- 👤 John C. Fischer
- 👤 Tudor L. Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:12
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/26; B01D53/261; B01D53/02; B01D53/06; B01D53/28; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/183; F; F24; F24F; F24F3/00; F24F3/12; F24F3/14; F24F3/1411; F24F3/1423; B01D2253/00; B01D2253/10; B01D2253/106; B01D2257/00; B01D2257/91; F24F2203/00; F24F2203/10; F24F2203/1032; F24F2203/1036; Y; Y02; Y02C; Y02C20/00; Y02C20/10; Y10; Y10S; Y10S95/00; Y10S95/90; Y10S95/902
Claims Analysis
Total Claims: 59
Claim 1
Independent Claim
39 words
A desiccant composition having a Type 1M moisture adsorption isotherm comprising (a) silica gel and (b) modified 13× molecular sieve in which at least 20 percent of the sodium cations have been replaced by one or more metallic cations.
Claim 2
Dependent Claim
39 words
A desiccant composition having a Type 1M moisture adsorption isotherm comprising (a) silica gel and (b) modified 13× molecular sieve in which at least 20 percent of the sodium cations have been replaced by one or more metallic cations.
Claim 3
Dependent Claim
11 words
The desiccant composition of claim 1 further comprising (c) hydrophobic adsorbent.
Claim 4
Dependent Claim
16 words
The desiccant composition of claim 2 in which the hydrophobic adsorbent is a hydrophobic silica gel.
Claim 5
Dependent Claim
16 words
The desiccant composition of claim 2 in which the hydrophobic adsorbent is a hydrophobic molecular sieve.
Claim 6
Dependent Claim
19 words
The desiccant composition of claim 4 in which the hydrophobic molecular sieve is a high silica Y-type molecular sieve.
Claim 7
Dependent Claim
62 words
The desiccant composition of claim 2 in which the silica gel on a dry basis comprises 13 to 26 percent by weight of the composition, the modified 13× molecular sieve on a dry basis comprises 74 to 82 percent by weight of the composition, and the hydrophobic adsorbent on a dry basis comprises 0.1 to 5 percent by weight of the composition.
Claim 8
Dependent Claim
10 words
A desiccant-coated substrate comprising the desiccant composition of claim 6.
Claim 9
Dependent Claim
29 words
A device for gas treatment comprising the desiccant composition of claim 6 designed so that the gas to be treated can be brought into contact with the desiccant composition.
Claim 10
Dependent Claim
14 words
The device for gas treatment of claim 8 which is a rotary dehumidification wheel.
Claim 11
Dependent Claim
29 words
A device for air treatment comprising the desiccant composition of claim 6 designed so that the air to be treated can be brought into contact with the desiccant composition.
Claim 12
Dependent Claim
62 words
The desiccant composition of claim 2 in which the silica gel on a dry basis comprises 17 to 20 percent by weight of the composition, the modified 13× molecular sieve on a dry basis comprises 78 to 80 percent by weight of the composition, and the hydrophobic adsorbent on a dry basis comprises 2 to 3 percent by weight of the composition.
Claim 13
Dependent Claim
44 words
The desiccant composition of claim 1 in which the silica gel on a dry basis comprises 13 to 26 percent by weight of the composition and the modified molecular sieve on a dry basis comprises 74 to 82 percent by weight of the composition.
Claim 14
Dependent Claim
44 words
The desiccant composition of claim 1 in which the silica gel on a dry basis comprises 17 to 20 percent by weight of the composition and the modified molecular sieve on a dry basis comprises 78 to 80 percent by weight of the composition.
Claim 15
Dependent Claim
21 words
The desiccant composition of claim 1 in which at least some of the one or more metallic cations are potassium cations.
Claim 16
Dependent Claim
20 words
The desiccant composition of claim 1 in which substantially all of the one or more metallic cations are potassium cations.
Claim 17
Dependent Claim
15 words
The desiccant composition of claim 1 having a separation factor of from 0.06 to 0.12.
Claim 18
Dependent Claim
10 words
A desiccant-coated substrate comprising the desiccant composition of claim 1.
Claim 19
Dependent Claim
29 words
A device for gas treatment comprising the desiccant composition of claim 1 designed so that the gas to be treated can be brought into contact with the desiccant composition.
Claim 20
Dependent Claim
14 words
The device for gas treatment of claim 18 which is a rotary dehumidification wheel.
Claim 21
Dependent Claim
29 words
A device for air treatment comprising the desiccant composition of claim 1 designed so that the air to be treated can be brought into contact with the desiccant composition.
Claim 22
Dependent Claim
72 words
A desiccant composition having a Type 1M moisture adsorption isotherm comprising (a) 13 to 26 percent by weight silica gel on a dry basis, (b) 74 to 82 percent by weight modified 13× molecular sieve on a dry basis in which at least 20 percent of the sodium cations have been replaced by one or more metallic cations, and (c) 0 to 5 percent by wight hydrophobic adsorbent on a dry basis.
Claim 23
Dependent Claim
72 words
A desiccant composition having a Type 1M moisture adsorption isotherm comprising (a) 13 to 26 percent by weight silica gel on a dry basis, (b) 74 to 82 percent by weight modified 13× molecular sieve on a dry basis in which at least 20 percent of the sodium cations have been replaced by one or more metallic cations, and (c) 0 to 5 percent by wight hydrophobic adsorbent on a dry basis.
Claim 24
Dependent Claim
25 words
The desiccant composition of claim 21 in which the hydrophobic adsorbent is selected from the group consisting of hydrophobic silica gel and hydrophobic molecular sieve.
Claim 25
Dependent Claim
19 words
The desiccant composition of claim 22 in which the hydrophobic molecular sieve is a high silica Y-type molecular sieve.
Claim 26
Dependent Claim
21 words
The desiccant composition of claim 21 in which at least some of the one or more metallic cations are potassium cations.
Claim 27
Dependent Claim
20 words
The desiccant composition of claim 21 in which substantially all of the one or more metallic cations are potassium cations.
Claim 28
Dependent Claim
30 words
The desiccant composition of claim 21 in which at least 30 percent of the sodium cations in the 13× molecular sieve have been replaced by one or more metallic cations.
Claim 29
Dependent Claim
21 words
The desiccant composition of claim 26 in which at least some of the one or more metallic cations are potassium cations.
Claim 30
Dependent Claim
20 words
The desiccant composition of claim 26 in which substantially all of the one or more metallic cations are potassium cations.
Claim 31
Dependent Claim
15 words
The desiccant composition of claim 21 having a separation factor of from 0.06 to 0.12.
Claim 32
Dependent Claim
14 words
The desiccant composition of claim 21 having a separation factor of 0.07 to 0.11.
Claim 33
Dependent Claim
14 words
The desiccant composition of claim 21 having a separation factor of 0.08 to 0.10.
Claim 34
Dependent Claim
62 words
The desiccant composition of claim 21 in which the silica gel on a dry basis comprises 17 to 20 percent by weight of the composition, the modified 13× molecular sieve on a dry basis comprises 78 to 80 percent by weight of the composition, and the hydrophobic adsorbent on a dry basis comprises 2 to 3 parts by weight of the composition.
Claim 35
Dependent Claim
10 words
A desiccant-coated substrate comprising the desiccant composition of claim 21.
Claim 36
Dependent Claim
29 words
A device for gas treatment comprising the desiccant composition of claim 21 designed so that the gas to be treated can be brought into contact with the desiccant composition.
Claim 37
Dependent Claim
14 words
The device for gas treatment of claim 34 which is a rotary dehumidification wheel.
Claim 38
Dependent Claim
29 words
A device for air treatment comprising the desiccant composition of claim 21 designed so that the air to be treated can be brought into contact with the desiccant composition.
Claim 39
Dependent Claim
78 words
A desiccant composition having a Type 1M moisture adsorption isotherm with a separation factor of from 0.06 to 0.12 comprising (a) 13 to 26 percent by weight silica gel on a dry basis, (b) 74 to 82 percent by weight modified 13× molecular sieve on a dry basis in which at least 20 percent of the sodium cations have been replaced by potassium cations, and (c) 0 to 5 percent by weight hydrophobic adsorbent on a dry basis.
Claim 40
Dependent Claim
78 words
A desiccant composition having a Type 1M moisture adsorption isotherm with a separation factor of from 0.06 to 0.12 comprising (a) 13 to 26 percent by weight silica gel on a dry basis, (b) 74 to 82 percent by weight modified 13× molecular sieve on a dry basis in which at least 20 percent of the sodium cations have been replaced by potassium cations, and (c) 0 to 5 percent by weight hydrophobic adsorbent on a dry basis.
Claim 41
Dependent Claim
25 words
The desiccant composition of claim 37 in which the hydrophobic adsorbent is selected from the group consisting of hydrophobic silica gel and hydrophobic molecular sieve.
Claim 42
Dependent Claim
19 words
The desiccant composition of claim 38 in which the hydrophobic molecular sieve is a high silica Y-type molecular sieve.
Claim 43
Dependent Claim
27 words
The desiccant composition of claim 37 in which at least 30 percent of the sodium cations in the 13× molecular sieve have been replaced by potassium cations.
Claim 44
Dependent Claim
14 words
The desiccant composition of claim 37 having a separation factor of 0.07 to 0.11.
Claim 45
Dependent Claim
14 words
The desiccant composition of claim 37 having a separation factor of 0.08 to 0.10.
Claim 46
Dependent Claim
62 words
The desiccant composition of claim 37 in which the silica gel on a dry basis comprises 17 to 20 percent by weight of the composition, the modified 13× molecular sieve on a dry basis comprises 78 to 80 percent by weight of the composition, and the hydrophobic adsorbent on a dry basis comprises 2 to 3 percent by weight of the composition.
Claim 47
Dependent Claim
27 words
The desiccant composition of claim 43 in which at least 30 percent of the sodium cations in the 13× molecular sieve have been replaced by potassium cations.
Claim 48
Dependent Claim
10 words
A desiccant-coated substrate comprising the desiccant composition of claim 44.
Claim 49
Dependent Claim
29 words
A device for gas treatment comprising the desiccant composition of claim 44 designed so that the gas to be treated can be brought into contact with the desiccant composition.
Claim 50
Dependent Claim
14 words
The device for gas treatment of claim 46 which is a rotary dehumidification wheel.
Claim 51
Dependent Claim
29 words
A device for air treatment comprising the desiccant composition of claim 44 designed so that the air to be treated can be brought into contact with the desiccant composition.
Claim 52
Dependent Claim
10 words
A desiccant-coated substrate comprising the desiccant composition of claim 43.
Claim 53
Dependent Claim
29 words
A device for gas treatment comprising the desiccant composition of claim 43 designed so that the gas to be treated can be brought into contact with the desiccant composition.
Claim 54
Dependent Claim
14 words
The device for gas treatment of claim 50 which is a rotary dehumidification wheel.
Claim 55
Dependent Claim
29 words
A device for air treatment comprising the desiccant composition of claim 43 designed so that the air to be treated can be brought into contact with the desiccant composition.
Claim 56
Dependent Claim
10 words
A desiccant-coated substrate comprising the desiccant composition of claim 37.
Claim 57
Dependent Claim
29 words
A device for gas treatment comprising the desiccant composition of claim 37 designed so that the gas to be treated can be brought into contact with the desiccant composition.
Claim 58
Dependent Claim
14 words
The device for gas treatment of claim 54 which is a rotary dehumidification wheel.
Claim 59
Dependent Claim
29 words
A device for air treatment comprising the desiccant composition of claim 37 designed so that the air to be treated can be brought into contact with the desiccant composition.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-04-04 | 1997-10-04 | 1998-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-04 | 2001-10-04 | 2002-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-04 | 2005-10-04 | 2006-04-05 | $7700.00 | Window Closed / Lapsed |