Recovery of modifier compounds and polar organic compounds from a poly (arylene sulfide)
A polyarylene sulfide and organic compound technology, applied in the preparation of organic compounds, preparation of hydroxyl compounds, separation/purification of carboxylic acid compounds, etc., can solve high production costs, high costs, high raw materials and waste treatment costs And other issues
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Embodiment 1
[0067] The following examples illustrate that methanol can be separated from NMP by fractional distillation.
[0068] 75 grams of methanol and 75 grams of NMP (Fisher purity grade) were added to a 250 mL round bottom flask containing the azeotrope chips. The flask was connected to a vacuum jacketed fractionation column. The round bottom flask was heated with a heating mantle, and the vacuum jacketed fractionation column was slowly heated due to internal reflux. Vapor begins to flow through the condenser and into the receiver, producing an overhead liquid stream. The flow of steam was slow until the temperature of the fractionation column increased with further heating of the round bottom flask. Once the boiling point of NMP is reached, the flow of the overhead liquid stream continues again. The vacuum jacketed fractionation column was then cooled to room temperature. The round bottom flask was then turned off from heating.
[0069] Fractions of the overhead liquid stream ...
Embodiment 2
[0072] This example illustrates that the recycle mixture can be separated to form methanol and a recycle feed mixture.
[0073] Take 504.20cm 3 Continuous speed per hour A recycle mixture containing 78.03 wt% NMP, 15.90 wt% methanol and 6.07 wt% sodium acetate was fed to a laboratory continuous still. A small amount of NMP was added to the still at the beginning. The still was heated until the recycle mixture began to reflux, at which point the still had a temperature of about 210°C and the temperature of the entire column was about 66-208°C. Make the overhead stream enter the overhead condenser through the overhead deflector, and then enter the overhead receiver to recover the methanol stream. The tower top deflector is designed to collect for 0.2 minutes and discharge to the top receiver for 5 seconds. The circulating raw material mixture is 87.40cm 3 / hr pumped from the still. After about 1 hour, a sample of the methanol stream was collected and a recycle feed mixture ...
Embodiment 3
[0078] This example demonstrates that the addition of water to the recycle mixture helps prevent the accumulation of sodium acetate at the bottom of the still.
[0079] The same process steps as in Example 2 were used except that the recycle mixture contained 14.60 wt% methanol, 72.00 wt% NMP, 4.60 wt% sodium acetate and 8.8 wt% water. The temperature of the distiller is about 190-198°C, and the temperature of the whole column is about 68-102°C. The tower top deflector is designed to collect for 0.3 minutes and discharge to the top receiver for 5 seconds.
[0080] Samples of the methanol stream and recycle feed mixture were collected after 8.66 hours of distillation and analyzed by gas chromatography. The recycled feed mixture contained 97.53 wt% NMP, 0.00 wt% methanol, 1.63 wt% water and 0.16 wt% other compounds. The methanol stream contained 97.36 wt% methanol, 0.03 wt% NMP, 2.60 wt% water and 0.02 wt% other compounds. Negligible precipitation of sodium acetate at the bot...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More