US3911046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of formaldehyde and phenol
Assignee: Societa Italiana Resine SpA SIR
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Filing: 1972-12-21
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Granted: 1975-10-07
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Expires: 1992-12-21
Abstract
Abstract Formaldehyde and phenol are recovered from waste liquors as useful products, with purification of the liquors, by blending of the relative dilute solutions under conditions such as will firstly bring about virtually complete elimination of the phenol in the form of resol phenolic resin and in the subsequent preparation of a mixed resin from phenol, formaldehyde and urea, by reaction of a further quantity of formaldehyde with urea, the said reaction taking place in the presence of the previously prepared resol phenolic resin.
Inventors
- 👤 Jacob Ackermann
- 👤 Pierino Radici
- 👤 Pietro Erini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:52
CPC Classifications
C; C08; C08G; C08G14/00; C08G14/02; C08G14/04; C08G14/06; C08G14/08; C02; C02F; C02F2101/00; C02F2101/30; C02F2101/34; C02F2101/345
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
194 words
PROCESS FOR THE SIMULTANEOUS RECOVERY IN THE FORM OF A USEFUL PRODUCT, OF FORMALDEHYDE AND PHENOL CONTAINED IN THE RELATIVE WASTE WATERS, AND FOR THE PURIFICATION OF THE SAID WASTE WATERS, COMPRISING: A. MIXING A WASTE AQUEOUS SOLUTION CONTAINING PHENOL IN A CONCENTRATION OF 0.01 TO 5.0% BY WEIGHT WITH A WASTE AQUEOUS SOLUTION CONTAINING FORMALDEHYDE IN A CONCENTRATION OF 0.5 TO 100% BY WEIGHT AND, IN A FIRST STAGE OF REACTION, FORMING A RESOL PHENOLIC RESIN AT A WORKING TEMPERATURE OF FROM 60* TO 120*C OVER A PERIOD OF 1 TO 8 HOURS, THE PH OF THE REACTION MEDIUM BEING HIGHER THAN 7 UP TO APPROXIMATELY 12, B. ADDING TO THE AQUEOUS SOLUTION OF PHENOLIC RESIN OBTAINED IN THE FIRST STAGE UREA AND POSSIBLY A FURTHER QUANTITY OF THE WASTE AQUEOUS SOLUTION CONTAINING FORMALDEHYDE AND, IN A SECOND STAGE OF REACTION, FORMING A MIXED PHENOL FORMALDEHYDE UREA RESIN AT AT WORKING TEMPERATURE OF FROM 60* TO 120*C FOR A PERIOD OF 1 TO 4 HOURS, AND C. DISTILLING THE WATER FROM THE AQUEOUS SOLUTION CONTAINING THE MIXED RESIN, OBTAINED IN THE SECOND STAGE OF THE REACTION, THE WORKING PRESSURE BEING BELOW ATMOSPHERIC PRESSURE.
Claim 2
Dependent Claim
194 words
PROCESS FOR THE SIMULTANEOUS RECOVERY IN THE FORM OF A USEFUL PRODUCT, OF FORMALDEHYDE AND PHENOL CONTAINED IN THE RELATIVE WASTE WATERS, AND FOR THE PURIFICATION OF THE SAID WASTE WATERS, COMPRISING: A. MIXING A WASTE AQUEOUS SOLUTION CONTAINING PHENOL IN A CONCENTRATION OF 0.01 TO 5.0% BY WEIGHT WITH A WASTE AQUEOUS SOLUTION CONTAINING FORMALDEHYDE IN A CONCENTRATION OF 0.5 TO 100% BY WEIGHT AND, IN A FIRST STAGE OF REACTION, FORMING A RESOL PHENOLIC RESIN AT A WORKING TEMPERATURE OF FROM 60* TO 120*C OVER A PERIOD OF 1 TO 8 HOURS, THE PH OF THE REACTION MEDIUM BEING HIGHER THAN 7 UP TO APPROXIMATELY 12, B. ADDING TO THE AQUEOUS SOLUTION OF PHENOLIC RESIN OBTAINED IN THE FIRST STAGE UREA AND POSSIBLY A FURTHER QUANTITY OF THE WASTE AQUEOUS SOLUTION CONTAINING FORMALDEHYDE AND, IN A SECOND STAGE OF REACTION, FORMING A MIXED PHENOL FORMALDEHYDE UREA RESIN AT AT WORKING TEMPERATURE OF FROM 60* TO 120*C FOR A PERIOD OF 1 TO 4 HOURS, AND C. DISTILLING THE WATER FROM THE AQUEOUS SOLUTION CONTAINING THE MIXED RESIN, OBTAINED IN THE SECOND STAGE OF THE REACTION, THE WORKING PRESSURE BEING BELOW ATMOSPHERIC PRESSURE.
Claim 3
Dependent Claim
37 words
Process according to claim 1, characterized in that in the first stage of reaction, a basic pH is maintained in the medium, using sodium hydroxide in quantities of 0.12 to 0.35 moles to every mole of phenol.
Claim 4
Dependent Claim
24 words
Process according to claim 2, characterized in that the said quantities of sodium hydroxide are 0.20 to 0.25 moles to every mole of phenol.
Claim 5
Dependent Claim
26 words
Process according to claim 1, characterized in that in the first stage of reaction, the molar ratios of formaldehyde to phenol are from 1.8:1 to 15:1.
Claim 6
Dependent Claim
15 words
Process according to claim 4, characterized in that the said ratios are 3:1 to 4:1.
Claim 7
Dependent Claim
27 words
Process according to claim 1, characterized in that in the second stage of reaction, the molar ratios of total formaldehyde to phenol are from 3:1 to 15:1.
Claim 8
Dependent Claim
15 words
Process according to claim 6, characterized in that the said ratios are 5:1 to 12:1.
Claim 9
Dependent Claim
27 words
Process according to claim 1, characterized in that in the second stage of reaction, the molar ratios of total formaldehyde to urea are from 1:1 to 5:1.
Claim 10
Dependent Claim
21 words
Process according to claim 1, characterized in that distillation of water is carried out at pressures of 30 to 150 torr.
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) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |