US3893893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the recovery of trichlorethylene from oil waste
Assignee: SILRESIM CHEMICAL Corp
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Filing: 1974-02-22
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Granted: 1975-07-08
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Expires: 1994-02-22
Abstract
Abstract A process for removing trichlorethylene solvents from a degreasing plant sludge oil mixture, which process comprises: employing an evaporation two-stage stripping operation to include a directly contacted heat interchange involving recirculation of a liquid oil solvent stream to avoid exceeding the critical decomposition temperature of the trichlorethylene, which process provides for the separation of solvent-free oil containing less than 50 parts per million solvent, the separation and recovery of the trichlorethylene solvent.
Inventors
- 👤 John G Miserlis
- 👤 Arthur Petrou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:06
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/38; B; B01; B01D; B01D3/00; B01D3/14; B01D3/32; B01D3/322; B01D3/42; B01D3/4211; C23; C23G; C23G5/00; C23G5/02; C23G5/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
316 words
AN APPARATUS FOR THE RECOVERY OF A HALOCARBON-OIL MIXTURE WHICH COMPRISES: A. A FIRST DISTILLATION COLUMN HAVING AN UPPER VAPOR SECTION AND A LOWER LIQUID SECTION, B. MEANS TO INTRODUCE THE MIXTURE AS A LIQUID PORTION AND A VAPOR PORTION INTO THE UPPPER VAPOR SECTION OF THE FIRST DISTILLATION COLUMN, THE LIQUID FLOWING TO THE LOWER LIQUID SECTION OF SAID COLUMN, C. A SECOND DISTILLATION COLUMN DOWNSTREAM OF THE FIRST DISTILLATION COLUMN AND IN COMMUNICATION THEREWITH, THE SECOND DISTILLATION COLUMN HAVING UPPER AND LOWER SECTIONS, D. MEANS TO INTRODUCE A PORTION OF THE LIQUID IN THE LOWER LIQUID SECTION OF THE FIRST DISTILLATION COLUMN INTO THE UPPER SECTION OF THE SECOND DISTILLATION COLUMN, E. MEANS TO INTRODUCE A CARRIER FLUID IMMISCIBLE WITH THE HALOCARBON INTO THE LOWER SECTION OF THE SECOND DISTILLATION COLUMN TO VOLATILIZE THE HALOCARBON CONTAINED IN THE LIQUID MIXTURE INTRODUCED UNTO THE SECOND DISTILLATION COLUMN FROM THE FIRST DISTILLATION COLUMN, THEREBY VOLATILIZING AT LEAST A PORTION OF THE HALOCARBON, THE VOLATILIZED HALOCARBON AND THE CARRIER FLUID FORMING A VAPOR STREAM, F. MEANS TO RECOVER FROM THE SECOND DISTILLATION COLUMN THE LIQUID PORTION FROM THE LOWER SECTION OF THE SECOND DISTILLATION COLUMN, G. MEANS TO INTRODUCE THE VAPOR STREAM FROM THE SECOND DISTILLATION COLUMN INTO THE LOWER LIQUID SECTION OF THE FIRST DISTILLATION COLUMN, THE VAPOR STREAM IMMISCBLE WITH THE HALOCARBON TO LOWER THE PARTIAL PRESSURE OF THE HALOCARBON IN THE FIRST DISTILLATION COLUMN, H. MEANS TO RECYCLE DIRECTLY FROM THE LOWER LIQUIE SECTION OF THE FIRST DISTIILLATION COLUMN A PORTION OF THE LIQUID IN THE LOWER LIQUID SECTION TO THE VAPOR SECTION ABOVE THE POINT OF INTRODUCTION OF THE MIXTURE, TO EXCHANGE THERMAL ENERGY WITH AND CONTROL TH TEMPERATURE OF THE MIXTURE INTRODUCED INTO THE UPPER SECTION OF THE FIRST DISTILLATION COLUMN, AND TO FORM VAPOROUS PORTION, AND I. MEANS TO RECOVER THE VAPOROUS PORTION FROM THE UPPER SECTION OF THE DISTILLATION COLUMN.
Claim 2
Independent Claim
316 words
AN APPARATUS FOR THE RECOVERY OF A HALOCARBON-OIL MIXTURE WHICH COMPRISES: A. A FIRST DISTILLATION COLUMN HAVING AN UPPER VAPOR SECTION AND A LOWER LIQUID SECTION, B. MEANS TO INTRODUCE THE MIXTURE AS A LIQUID PORTION AND A VAPOR PORTION INTO THE UPPPER VAPOR SECTION OF THE FIRST DISTILLATION COLUMN, THE LIQUID FLOWING TO THE LOWER LIQUID SECTION OF SAID COLUMN, C. A SECOND DISTILLATION COLUMN DOWNSTREAM OF THE FIRST DISTILLATION COLUMN AND IN COMMUNICATION THEREWITH, THE SECOND DISTILLATION COLUMN HAVING UPPER AND LOWER SECTIONS, D. MEANS TO INTRODUCE A PORTION OF THE LIQUID IN THE LOWER LIQUID SECTION OF THE FIRST DISTILLATION COLUMN INTO THE UPPER SECTION OF THE SECOND DISTILLATION COLUMN, E. MEANS TO INTRODUCE A CARRIER FLUID IMMISCIBLE WITH THE HALOCARBON INTO THE LOWER SECTION OF THE SECOND DISTILLATION COLUMN TO VOLATILIZE THE HALOCARBON CONTAINED IN THE LIQUID MIXTURE INTRODUCED UNTO THE SECOND DISTILLATION COLUMN FROM THE FIRST DISTILLATION COLUMN, THEREBY VOLATILIZING AT LEAST A PORTION OF THE HALOCARBON, THE VOLATILIZED HALOCARBON AND THE CARRIER FLUID FORMING A VAPOR STREAM, F. MEANS TO RECOVER FROM THE SECOND DISTILLATION COLUMN THE LIQUID PORTION FROM THE LOWER SECTION OF THE SECOND DISTILLATION COLUMN, G. MEANS TO INTRODUCE THE VAPOR STREAM FROM THE SECOND DISTILLATION COLUMN INTO THE LOWER LIQUID SECTION OF THE FIRST DISTILLATION COLUMN, THE VAPOR STREAM IMMISCBLE WITH THE HALOCARBON TO LOWER THE PARTIAL PRESSURE OF THE HALOCARBON IN THE FIRST DISTILLATION COLUMN, H. MEANS TO RECYCLE DIRECTLY FROM THE LOWER LIQUIE SECTION OF THE FIRST DISTIILLATION COLUMN A PORTION OF THE LIQUID IN THE LOWER LIQUID SECTION TO THE VAPOR SECTION ABOVE THE POINT OF INTRODUCTION OF THE MIXTURE, TO EXCHANGE THERMAL ENERGY WITH AND CONTROL TH TEMPERATURE OF THE MIXTURE INTRODUCED INTO THE UPPER SECTION OF THE FIRST DISTILLATION COLUMN, AND TO FORM VAPOROUS PORTION, AND I. MEANS TO RECOVER THE VAPOROUS PORTION FROM THE UPPER SECTION OF THE DISTILLATION COLUMN.
Claim 3
Dependent Claim
42 words
The apparatus of claim 1, which includes means to effect a heat transfer with the liquid stream introduced into the upper vapor section from the lower liquid section of the first distillation column prior to its introduction into the upper vapor section.
Claim 4
Dependent Claim
31 words
The apparatus of claim 1, which includes means to control the amount of the liquid introduced into the upper vapor section from the lower liquid section of the first distillation column.
Claim 5
Dependent Claim
35 words
The apparatus of claim 1 wherein the first distillation column includes a packed section in the upper vapor section to enhance the mixing of the vapor stream with the recycled liquid stream and the halocarbon.
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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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |