Process for extracting and separating caprolactam from amide oil
A technology of caprolactam and amide oil, applied in the separation/purification of lactam, chemical instruments and methods, organic chemistry, etc., can solve the problems of limited processing capacity, low extraction capacity, high boiling point, etc., achieve less solvent consumption and improve purity , the effect of high purity
A technology of caprolactam and amide oil, applied in the separation/purification of lactam, chemical instruments and methods, organic chemistry, etc., can solve the problems of limited processing capacity, low extraction capacity, high boiling point, etc., achieve less solvent consumption and improve purity , the effect of high purity
CN1629143AActive Publication Date: 2005-06-22CHINA PETROLEUM & CHEM CORP +2
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Embodiment 1
[0025] sample discription
Embodiment 2
[0027] project
[0028] Note: √, means there is this step; ×, means there is no such step; comparison refers to the volume ratio of solvent phase to water phase (or amide oil).
Embodiment 3
[0030] project
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The invention provides a process for extracting and separating caprolactam from amide oil which comprises, using cyclohexane or the mixed solvent of cyclohexane and benzene to pre-extract amide oil and remove part of the impurity, then using benzene or the mixed solvent of cyclohexane and benzene to extract the dense phase obtained from the pre-abstraction, finally back washing the light phase with water to obtain the water solution of caprolactam.
Description
technical field [0001] The invention relates to a method for extracting and purifying caprolactam from amide oil, which belongs to the technical field of chemical mass transfer and separation. Background technique [0002] Caprolactam is an important organic chemical raw material, mainly used in the production of nylon fiber and nylon resin. It is also an excellent solvent and has a wide range of applications. [0003] There are many industrial preparation methods of caprolactam, such as cyclohexane-hydroxylamine method, toluene method and so on. Due to the long reaction route, the amide oil obtained by the reaction contains various impurities. To obtain the caprolactam product, a series of physical and chemical refining methods must be adopted, such as extraction, chemical treatment and multi-effect distillation. Solvent extraction is the most effective means for the preliminary purification of caprolactam from amide oil, and benzene and toluene are the most commonly used ...
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Patent Timeline
22 Jun 2005
Publication
CN1629143A
- IPC
- C07D201/16; C07D223/10
- Inventors
- 吕阳成; 骆广生