摘要:
The present invention relates to a process for the phosgenation of amines in the gas phase, in which a specific type of heat exchanger is used for vaporizing the amines.
摘要:
A locking device has an actuating lever for an adjustable steering column in a vehicle. The locking device is provided between a mounting fixed on the vehicle and a casing tube. The casing tube surrounds the steering column and can be adjusted relative to the mounting. The actuating lever can be pivoted below and/or to the side of the casing tube between a locking position and a release position for locking and releasing the casing tube. A handle component for the actuating lever is positioned at a given distance from the casing tube when the actuating lever is in the locking position. The actuating lever is configured as a deformation element and, when there is an impact, the handle component can be deformed in a direction toward the casing tube for absorbing energy and protecting the driver.
摘要:
A process for the production of aliphatic oligocarbonate diols is disclosed. The optionally catalyzed high yield process entails the multistage transesterification of aliphatic diols with dimethyl carbonate. In the process DMC-methanol mixtures that have been distilled off are recycled to the reaction solution with further conversion and depletion of the contained DMC in the same or in a following reaction batch.
摘要:
The present invention relates to a process for producing an aliphatic oligocarbonate diol comprising a) reacting an aliphatic diol with dimethyl carbonate at an elevated pressure in a reaction mixture, and b) subsequently removing unreacted methanol and dimethyl carbonate under a reduced pressure to uncap the terminal OH groups.
摘要:
The present invention relates to a process for producing an aliphatic oligocarbonate diol comprising a) reacting an aliphatic diol with dimethyl carbonate at an elevated pressure in a reaction mixture, and b) subsequently removing unreacted methanol and dimethyl carbonate under a reduced pressure to uncap the terminal OH groups.