| Patent Number |
Title Of Patent |
Date Issued |
| 6028230 |
Epoxide polymerization process |
February 22, 2000 |
| The amount of high molecular weight impurity present in a polyether polyol produced by alkoxylation of an active hydrogen-containing initiator using an epoxide such as propylene oxide and a substantially amorphous highly active double metal cyanide complex catalyst may be advantageously |
| 6024840 |
Propylene oxide purification |
February 15, 2000 |
| Propylene oxide obtained by an epoxidation process which uses methanol as a solvent may be effectively treated to remove acetaldehyde by subjecting the crude epoxidation reaction product to fractional distillation. The methanol solvent is utilized during such distillation to lower the |
| 5863391 |
Purification of a methanol stream |
January 26, 1999 |
| Acetaldehyde may be effectively removed from a contaminated methanol stream using a distillation method wherein a solvent stream containing a relatively heavy polar compound such as water or propylene glycol is utilized as an extractive distillation solvent. Following the separation |
| 5849938 |
Separation of methanol and propylene oxide from a reaction mixture |
December 15, 1998 |
| Propylene is separated from the methanol present as a solvent in a crude olefin epoxidation product by means of an extractive distillation wherein a relatively heavy polar solvent having hydroxy groups such as water or propylene glycol is used as the extractive solvent. The method is als |
| 5782989 |
Solvent system and method for removing polymer scale from vinyl polymer polymerization reactors |
July 21, 1998 |
| Polymer scale removal from vinyl polymerization reactors is effected without the use of polar aprotic solvents or aromatic solvents, by adding to the reactor, a scale removal composition comprising acetone, a most minor amount of a strong base, and a minor amount of a hydroxyl- or am |
