TH13554A - Purification for propylene oxide - Google Patents

Abstract

Purification methods for propylene oxide with polypropylene impurities (Propylene Oxide) with a molecular weight of at least 50,000, in an unacceptable amount, this process contains propylene oxide impregnation with such impurities in contact with non-calcined diatomaceous earth To mostly ash in a certain amount for a period of time And under various conditions This is sufficient to reduce the amount of such contaminants in the propylene oxide. Reached acceptable levels and rejection of pure propylene oxide products. A process for preparing polyether polyol from the aforementioned pure propylene oxide products and a process for preparing highly returnable polyurethane foam from polyol. Such

Claims (4)

1. Purification process for polypropylene oxide with heavy poly (propylene) oxide impurities. At least approximately 50,000 molecules are present in that quantity. Not accepted Which this process consists of for example Allow polypylene oxide containing such contaminants to come into contact with soil. Light that does not incinerate mainly in a certain amount periodically. A certain time and under different conditions Sufficient make the amount of The contaminants in such propylene oxide dropped to the level of 2. The process as defined in Clause 1, this diatomaceous earth is recognized and reverted to purified propylene oxide products. Not thermally decomposed at any magnitude satisfactory. 3. The process defined in claim 2, which this diatomite contains The BET surface area is at least approximately 15 square meters per gram. 4. Process as defined in Clause 3. The BET surface area is at least approximately 35 square meters per gram. 5. Process as defined in Clause 4. BET surface area is at least approximately 60 square meters per gram. 6. Process as defined in Clause 5. Show the difference in the surface area of adsorption and emission. The absorption of this diatomaceous soil is at least approximately 15 percent. 7. The process defined in claim 6, which is Show the difference in the surface area of adsorption and emission. Leave this absorption of diatomaceous soil at least approximately. 40 percent 8. Process as defined in Clause 7, which this light soil Show the difference in the surface area of adsorption and emission. Leave this absorption of diatomaceous soil at least approximately. 80 percent 9. The process defined in claim 6, which this diatomite contains The average pore radius is approximately 120 angstroms or less than 1.0. Process as defined in Clause 1, where the product Refined propylene oxide contains less than approximately 100 parts per billion (ppb) of the above mentioned poly (propylene oxide) contaminants. 1. The process defined in claim 10, where this pure propylene oxide product contains approximately 65 ppb less than the aforementioned poly (propylene oxide) contaminants. 2. The process defined in claim 11, where this pure propylene oxide product contains approximately 50 ppb less than the aforementioned poly (propylene oxide) contaminants. 3. The process as defined in claim 1, wherein exposure of contaminated propylene oxide to diatomaceous earth does not This cremation mainly consists of, for example, making diatomite and propylene. Oxides that are contaminated as slory together 1 4. The process as defined in claim 1, wherein exposure of contaminated propylene oxide to diatomaceous earth is not This mostly cremated to ash consisted of, for example, having propylene oxide with this contaminant through the base of this diatomite.