Abstract

An object of the present invention is to remove fluoromethyl-1,1,3,3,3-pentafluoroisopropenyl (compound A) from a composition containing sevoflurane and compound A so as to collect high-purity sevollurane. The present invention concerns a method for producing sevoflurane containing substantially no compound A, comprising the following steps of: bringing a composition containing hydrogen fluoride (HF) and water at a mass ratio of 1:1 to 1:30 into contact with a 1st organic liquid containing sevoflurane and a compound A, thereby obtaining a 2nd organic liquid containing the compound A in an amount that is lower than that in the 1st organic liquid (step 1a); and distilling the 2nd organic liquid under the presence of a degradation inhibitor, thereby obtaining sevoflurane containing substantially no compound A as a main distillation fraction (step 2).

IPC Classes  ?

• C07C 17/42 - Use of additives, e.g. for stabilisation
• C07C 17/087 - Preparation of halogenated hydrocarbons by addition of hydrogen halides to unsaturated halogenated hydrocarbons

Abstract

It is an object of the present invention to provide a method for effectively washing a used "sevoflurane storage container' without using expensive sevoflurane as a washing liquid. This object is achieved by employing the washing method, comprising the steps of: creating a state in which at least sevoflurane vapor is present in the storage container (step A); bringing a "liquid containing water as a major component'' into contact with the inner wall of the sevoflurane storage container in the state in which sevoflurane vapor is present in the storage container and draining the liquid outside of the storage container while the liquid remains liquid after step A (step B); and introducing a drying gas into the storage container so as to drain the liquid remaining on the inner wall of the storage container together with the drying gas outside of the storage container after step B (step C).

IPC Classes  ?

• B08B 9/093 - Cleaning of containers, e.g. tanks by the force of jets or sprays
• A61K 31/08 - Ethers or acetals acyclic, e.g. paraformaldehyde
• B08B 5/02 - Cleaning by the force of jets, e.g. blowing-out cavities

Abstract

Disclosed is a method for producing a hexafluoroisopropanol, including the steps of (a) purifying a mixture containing hexafluoroacetone and at least 1,1,1-trifluoro-2,2-dichloroethane as an impurity, thereby obtaining a purified hexafluoroacetone containing 120 ppm or lower of the 1,1,1-trifluoro-2,2-dichloroethane; and (b) bringing hydrogen (H2) into contact with the purified hexafluoroacetone in the presence of a catalyst, thereby hydrogenating the hexafluoroacetone into the hexafluoroisopropanol. It is possible by this method to produce the hexafluoroisopropanol with a short reaction time and a high conversion. Therefore, it may be possible to particularly advantageously produce fluoromethyl hexafluoroisopropyl ether (sevoflurane) by using the hexafluoroisopropanol produced by the method.

IPC Classes  ?

• C07C 41/01 - Preparation of ethers

Abstract

A window structure is provided which may be used as a rear window in a pick- up truck or the like. In certain example embodiments, the window structure includes a slidable window panel or sheet located between a pair of fixed window panels or sheets. The slidable window panel may be approximately flush with the fixed panels when in the closed position, but not in the opened position.

IPC Classes  ?

• B60J 1/18 - Windows; Windscreens; Accessories therefor arranged at the vehicle rear
• B60J 1/16 - Windows; Windscreens; Accessories therefor arranged at vehicle sides adjustable slidable