Device and method for separating n-methylpyrrolidine, water and tetrahydrofuran
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A technology of methylpyrrolidine and tetrahydrofuran, which is applied in the field of separation of N-methylpyrrolidine in water and tetrahydrofuran devices, can solve the problems of high energy consumption, low yield and high production cost, and achieve the effect of eliminating three wastes
Active Publication Date: 2019-03-29
烟台国邦化工机械科技有限公司
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[0010] Aiming at the deficiencies in the prior art, the present invention provides a device and method for separating N-methylpyrrolidine, water, and tetrahydrofuran, which solves the problems of high energy consumption, low yield, high production cost and post-treatment of traditional devices and processes. troublesome question
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Embodiment approach 1
[0063] The raw material and the entrainer are added into the rough steaming tower 102 still 101 at one time with a ratio of 0.02:1. In this embodiment, the entraining agent adopts n-hexane, and the rough steaming tower 102 still 101 heats the raw material to make The raw material turns into steam, and the raw material steam rises to the top of the rough steaming tower 102, and then enters the first condenser 2 connected with the rough steaming tower 102 for condensation. After the phase changes into liquid, a part of it enters the phase separation tank 3 , the other part enters the reflux head, wherein the raw material entering the reflux head is regulated by the reflux ratio controller 12, a part returns to the rough distillation tower 102 tower top, and the other part returns through the first cooler 13 and the first fraction receiving tank 4 In the crude steaming tower 102 still 101, enter the raw material in the phase separation tank 3 to carry out phase separation, wherein...
Embodiment approach 2
[0066] The raw material and the entrainer are added into the crude distillation tower 102 and the kettle 101 at one time at a ratio of 0.2:1. In this embodiment, the entrainer is a mixture of 2-methylpentane and cyclohexane, which is roughly steamed The tower 102 and the still 101 heat the raw material to turn the raw material into steam, and the raw material steam rises to the top of the rough steaming tower 102, and then enters the first condenser 2 connected to the rough steaming tower 102 for condensation, and the phase changes After the liquid, part of it enters the phase separation tank 3, and the other part enters the reflux head, wherein the raw material entering the reflux head is regulated by the reflux ratio controller 12, and part of it returns to the top of the rough distillation tower 102, and the other part passes through the first cooling The device 13 and the first fraction receiving tank 4 are returned to the crude distillation tower 102 still 101, and the raw...
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Abstract
Provided are a device and method for separating N-methylpyrrolidine, water and tetrahydrofuran. The device comprises a crude product dehydration working section and a product refining working section. The crude product dehydration working section comprises a crude product intermittent column, a first condenser, a phase splitting tank, a backflow head and the like. The crude product intermittent column comprises a crude steaming column reactor and a crude steaming column. The product refining working section comprises a refining intermittent column, a second condenser, a transition cut fraction receiving tan and a product receiving tank. The refining intermittent column comprises a rectifying column reactor and a rectifying column located at the top of the rectifying column reactor. The crude product dehydration working section is communicated with the rectifying column reactor of the product refining working section through a crude product storage tank communicated with the crude steaming column reactor. A two-column intermittent rectifying process is adopted in the method, water and tetrahydrofuran are taken out through the crude product intermittent column, left raw materials are purified through the product refining working section, and high-purity N-methylpyrrolidine is obtained. The problems that a traditional device and technique are large in energy consumption, low in yield, high in production cost and troublesome in aftertreatment are solved.
Description
technical field [0001] The invention relates to a device and method for separating N-methylpyrrolidine, water and tetrahydrofuran, belonging to the field of fine chemical material purification. Background technique [0002] N-methylpyrrolidine, also known as N-methyltetrahydropyrrole, is a cyclic secondary amine, colorless to slightly yellowish liquid, relative molecular weight: 85.15, boiling point: 80.8°C, relative density (25°C) is 0.81, CAS No: 120-94-5, has the properties of general amines, has strong water absorption, and has certain potential toxicity to the human body. [0003] N-Methylpyrrolidine is an important organic chemical intermediate, widely used in the fields of medicine, spices, daily chemicals, electronic chemicals, dyes, photosensitive materials, pesticide organic amine catalysts and conductive polymers. Among them, cefepime, which uses N-methylpyrrolidine as an intermediate, is called the fourth-generation cephalosporin together with cefotaxime, cefpir...
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