Process for producing alkanolamine
AssigneeNippon Shokubai Co., Ltd.
InventorsDaisuke Ichikawa, Takahiro Sugiya
Life of this patent
Estimating the term…
Abstract
The present invention provides a method of producing an ethanolamine, with a low production ratio of a dialkanolamine (for example, less than 30% by weight). A process for producing an alkanolamine of the present invention includes reacting an alkylene oxide with ammonia to obtain a reaction product containing a monoalkanolamine, a dialkanolamine, and a trialkanolamine; separating the dialkanolamine from the reaction product; and recycling at least a portion of the dialkanolamine for the reaction of an alkylene oxide with ammonia, wherein in the recycling step, the dialkanolamine is supplied in a molar ratio of the alkylene oxide (moles) to a total amount (moles) of ammonia and the dialkanolamine of 0.08 or more and less than 0.26.
Claims3
A process for producing an alkanolamine, the process comprising reacting an alkylene oxide with ammonia to obtain a reaction product containing a monoalkanolamine, a dialkanolamine, and a trialkanolamine;
- separating the dialkanolamine from the reaction product;
- and recycling at least a portion of the dialkanolamine for the reaction of an alkylene oxide with ammonia,
- wherein in the recycling step, the dialkanolamine is supplied in a molar ratio of the alkylene oxide (moles) to a total amount (moles) of ammonia and the dialkanolamine of 0.08 or more and less than 0.26, wherein in the recycling step, the dialkanolamine is supplied in a ratio (weight ratio) of the dialkanolamine to the ammonia of 0.05 or more and less than 0.18.
Dependencies are inferred from the claim text.