US3950247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation procedure
Assignee: Monsanto Co
•
Filing: 1971-10-20
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Granted: 1976-04-13
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Expires: 1991-10-20
Abstract
Abstract Process for the separation of water from mixtures of water and organic or inorganic compounds, soluble in water, by contacting the mixtures against an organic polymeric membrane, and withdrawing at the other side of the membrane a mixture having a higher concentration of water.
Inventors
- 👤 Robert Chiang
- 👤 Eli Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:44
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/36; B01D61/362; B01D71/00; B01D71/06; B01D71/30; B01D71/301; C; C01; C01B; C01B7/00; C01B7/01; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C45/00; C07C45/78; C07C45/786; C07D; C07D309/00; C07D309/34; C07D309/36; C07D309/40
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
63 words
Process for the separation of water from feed mixtures comprising water and formaldehyde which comprises contacting the aforesaid mixture against one side of a polyvinylchloride membrane and withdrawing, at the second side, a vaporous mixture having a higher concentration of water than the aforesaid feed mixture, with the mixture at second side being maintained at a lower chemical potential than the feed side.
Claim 2
Dependent Claim
63 words
Process for the separation of water from feed mixtures comprising water and formaldehyde which comprises contacting the aforesaid mixture against one side of a polyvinylchloride membrane and withdrawing, at the second side, a vaporous mixture having a higher concentration of water than the aforesaid feed mixture, with the mixture at second side being maintained at a lower chemical potential than the feed side.
Claim 3
Dependent Claim
15 words
Process as in claim 1 in which the feed mixture comprises water, formaldehyde and methanol.
Claim 4
Dependent Claim
76 words
Process for the separation of water from feed mixtures comprising water and formaldehyde which comprises contacting the aforesaid mixture against one side of a polyvinylchloride membrane and withdrawing, at the second side, a vaporous mixture having a higher concentration of water than the aforesaid feed mixture, with the mixture at the second side being maintained at a pressure which is greater than atmospheric, but is less than the pressure at the feed side of the membrane.
Claim 5
Dependent Claim
76 words
Process for the separation of water from feed mixtures comprising water and formaldehyde which comprises contacting the aforesaid mixture against one side of a polyvinylchloride membrane and withdrawing, at the second side, a vaporous mixture having a higher concentration of water than the aforesaid feed mixture, with the mixture at the second side being maintained at a pressure which is greater than atmospheric, but is less than the pressure at the feed side of the membrane.
Claim 6
Dependent Claim
72 words
Process for the separation of water from feed mixtures comprising water and formaldehyde which comprises contacting the aforesaid mixture against one side of a polyvinylchloride membrane and withdrawing, at the second side, a vaporous mixture having a higher concentration of water than the aforesaid feed mixture, with the mixture at the said second side being maintained at a pressure less than atmospheric, but less than the pressure at the said feed side.
Claim 7
Dependent Claim
72 words
Process for the separation of water from feed mixtures comprising water and formaldehyde which comprises contacting the aforesaid mixture against one side of a polyvinylchloride membrane and withdrawing, at the second side, a vaporous mixture having a higher concentration of water than the aforesaid feed mixture, with the mixture at the said second side being maintained at a pressure less than atmospheric, but less than the pressure at the said feed side.
Claim 8
Dependent Claim
77 words
Process for the separation of water from feed mixtures comprising water and formaldehyde which comprises contacting the aforesaid mixture against one side of a polyvinylchloride membrane and withdrawing, at the second side, a vaporous mixture having a higher concentration of water than the aforesaid feed mixture, with the mixture at the second side being maintained at a pressure less than atmospheric, and the pressure at the said feed side being maintained at a pressure greater than atmospheric.
Claim 9
Dependent Claim
77 words
Process for the separation of water from feed mixtures comprising water and formaldehyde which comprises contacting the aforesaid mixture against one side of a polyvinylchloride membrane and withdrawing, at the second side, a vaporous mixture having a higher concentration of water than the aforesaid feed mixture, with the mixture at the second side being maintained at a pressure less than atmospheric, and the pressure at the said feed side being maintained at a pressure greater than atmospheric.
Claim 10
Dependent Claim
23 words
Process as in claim 5 in which the said second side is maintained at a vacuum of from 0.2 to 759 mm. Hg.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |