The present invention provides a method for preparing amides, in which an amino acid ionic liquid is used as both a reaction medium and a catalyst to catalyze Beckman rearrangement of a ketoxime, so as to produce an amide. In the method, the rearrangement is conducted by catalyzing a ketoxime with an amino acid ionic liquid having the asymmetric property at a moderate reaction temperature during a short reaction time, so as to produce an amide without adding other catalysts such as concentrate sulfuric acid. The method has advantages such as avoiding corrosion in equipments with pipelines, the high conversion rate of ketoximes and the high selectivity of amides.
METHOD FOR SEPARATING AMIDE FROM AMINO ACID IONIC LIQUID
申请人:Hsieh Cheng-Fa
公开号:US20110105793A1
公开(公告)日:2011-05-05
The present invention provides a method for separating an amide from an amino acid ionic liquid. The method includes the step of providing a polar solvent and an extracting agent to the amino acid ionic liquid, so as to separate the amide from the amino acid ionic liquid. In the method of the present invention, there is no need to add ammonium for neutralization, such that no byproduct, ammonium sulfate, is formed. In addition, after the amide is separated from the amino acid ionic liquid, the amino acid ionic liquid can be recycled.
CATALYST COMPOSITION AND METHOD FOR PREPARING AMIDE USING THE SAME
申请人:Tsai Tung-Han
公开号:US20120184733A1
公开(公告)日:2012-07-19
The present invention provides a method for preparing an amide. The method includes the steps of performing in a reactor including a catalyst composition having a nitrogen-containing heterocyclic compound and sulfuric acid Beckman rearrangement of a ketoxime to form a product stream having the amide, wherein a molar ratio of the nitrogen-containing heterocyclic compound to the sulfuric acid is from 1:1 to 1:8; and separating an organic phase having the amide and an aqueous phase having the catalyst composition from the product stream. The present invention facilitates the regeneration of the catalyst composition with low water content, so as to increase the conversion rate of a ketoxime and the selectivity of an amide.
Process for preparing purified caprolactam from the Beckmann rearrangement of cyclohexane oxime
申请人:BASF SE
公开号:US08841445B2
公开(公告)日:2014-09-23
A process is described for preparing purified caprolactam, comprising the steps
a) extraction of crude caprolactam, obtained from the Beckmann rearrangement of cyclohexanone oxime, with an organic extractant,
b) removal of the organic phase from step a),
c) distillative separation of the organic extractant from the organic phase from step b) giving rise to water-containing lactam extract, being preceded by addition of the distillative separation, aqueous alkali metal hydroxide solution in an amount of from 0 to 10 mmol/kg of caprolactam,
d) addition of 0 to 30 mmol of alkali metal hydroxide/kg of caprolactam to the water-containing lactam extract from step c),
e) distillative removal of water from the water-containing lactam extract treated with alkali metal hydroxide from step d),
f) freeing the caprolactam from step e) from by-products lower- and higher-boiling than caprolactam by distillation,
with addition in steps c) and d) together of at least 1.5 mmol of alkali metal hydroxide/kg of caprolactam.
Method and catalyst composition comprising an amino acid-ionic liquid and a Bronsted acid, for preparing amide
申请人:China Petrochemical Development Corporation
公开号:EP2308831A1
公开(公告)日:2011-04-13
The present invention provides a catalyst composition for preparing an amide, including an amino acid ionic liquid having a cation of formula (1)
and an anion selected from the group consisting of an inorganic acid group, an organic acid group and a combination thereof, wherein the numbers of the anion and the cation are such that the amino acid ionic liquid is electroneutral; and a Bronsted acid. The present invention also provides a method for preparing an amide in the presence of the catalyst composition, and the method has advantages such as decreasing viscosity of ionic liquid, and increasing conversion rate of ketoximes and selectivity of amides.