Production processes
a production process and process technology, applied in the field of production processes, can solve the problems of increasing the cost of hfc-125 production, new compounds that do not meet environmental safety requirements, and ineffective distillation of azeotropic mixtures as separation techniques
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
Problems solved by technology
Method used
Examples
example 1
Screening of extracting Agents for Vapor Phase Separation of HFC-125 and CFC-115
[0025] A 50 cc stainless steel sample cylinder fitted with a pressure gauge and valve with a septum port was chilled to −78° C. and a known amount of HFC-125 and CFC-115 was charged to the cylinder. This mixture was shaken and allowed to warm to ambient temperature and the vapor phase was sampled for subsequent analysis by gas chromatography (GC).
[0026] The cylinder was then re-cooled to −78° C. and a desired amount of the chosen extraction solvent was added to the vessel. The mixture was then allowed to warm to ambient temperature, at which time, it was shaken and allowed to equilibrate for 3 to 12 hours before it was re-sampled for GC analysis.
[0027] All GC data of this and the following examples were taken by sampling a collection or storage vessel or the appropriate sample port with a 50 to 250 μL airtight syringe fitted with an on / off valve. This collected sample was injected on either an HP-5890...
example 2
Vapor Phase Separation of HFC-125 from CFC-115 Using HFP as an Extracting Agent
[0038] This procedure demonstrates the effective removal of CFC-115 from streams of the first mixture comprising HFC-125 and CFC-115, by the use of HFP as an extracting agent.
[0039] The apparatus used was a 92 in. packed, schedule 40, carbon steel distillation column fitted with a reboiler, overhead condenser, overhead reflux loop, timed take-off valves, and multiple feed points. This evacuated column was charged with 584 g of the first mixture comprising 97.928% of HFC-125 and 2.073% of CFC-115, by weight. This mixture was allowed to equilibrate at a reflux ranging from 14 to 29 cc / min. HFP was then fed into the column at an average rate of 1.98 g / min, while taking off CFC-115 and HFP at a rate of 1.75 g / min as the bottom product from the reboiler.
[0040] The operation was continued over 2348 minutes. The total amount of HFP added was 4438 g. During this time, the relative ratio of HFC-125 to CFC-115 i...
example 3
Purification of HFP
[0044] To demonstrate this process, 507 grams of a mixture containing 90.17% of HFP, 9.798% of HFC-125, and 0.025% of CFC-115 (see TABLE III) was charged to an apparatus consisting of a 92 in. packed, schedule 40, carbon steel distillation column fitted with a reboiler, overhead condenser, and overhead reflux loop. This mixture was allowed to equilibrate with a steady reflux for 224 minutes. The distillation was run at a pressure of about 122-123 psig. The boiler temperature was set at about 31.4° C., and the overhead temperature was set at about 27° C. The overhead and reboiler compositions were checked by GC analysis. The column was then equilibrated for another 100 minutes to obtain further homogeneity of the HFP in the reboiler of the column (see TABLE III). This demonstrates that the longer the distillation was run, the higher purity of HFP was obtained. This level of purity is acceptable for recycle to the HFC-125 extractive distillation system or to be use...
PUM
| Property | Measurement | Unit |
|---|---|---|
| time- | aaaaa | aaaaa |
| temperature | aaaaa | aaaaa |
| temperature | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More