Method for separating azeotropic mixture of ethyl methyl ketone and water through variable-pressure rectification

A technology of pressure swing rectification and methyl ethyl ketone, which is applied in the field of chemical distillation and purification, can solve the problem of high energy consumption, and achieve the effect of improving product purity, reducing energy consumption, and reasonable equipment

Inactive Publication Date: 2010-09-15
CHANGZHOU UNIV
View PDF2 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The defective and the deficiency that exist in above-mentioned prior art are: (1) the energy consumption of separation process is relatively high

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for separating azeotropic mixture of ethyl methyl ketone and water through variable-pressure rectification
  • Method for separating azeotropic mixture of ethyl methyl ketone and water through variable-pressure rectification
  • Method for separating azeotropic mixture of ethyl methyl ketone and water through variable-pressure rectification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The feed flow rate is 2500kg / h, the temperature is 45°C, the pressure is 0.15Mpa (absolute pressure), and the composition: 32% methyl ethyl ketone and 68% water. The return flow rate is 657.7kg / h. Atmospheric pressure tower diameter 800mm, 32 theoretical plates, feed in the 12th block, packed with 9.5m BX500 structured wire mesh corrugated packing; pressurized tower diameter 400mm, 38 theoretical plates, feed in the 16th block, packed BX500 inside Structured wire mesh corrugated packing 11.2m.

[0026] The operating process parameters of the towers are shown in Table 1 and Table 2, the composition of the top and bottom materials of each tower are shown in Table 3, and the feeds of each tower and the flow rate of the top and bottom materials are shown in Table 4. It can be seen that by adopting the variable pressure rectification method of the present invention, the purity of methyl ethyl ketone after purification reaches 99.9%, and the yield reaches more than 99.8%.

[002...

Embodiment 2

[0036] The feed flow rate is 3200kg / h, the temperature is 45°C, the pressure is 0.15Mpa (absolute pressure), and the composition: methyl ethyl ketone 45% and water 55%. The return flow rate is 1183kg / h. The diameter of the atmospheric tower is 950mm, and the diameter of the pressurized tower is 500mm. Other conditions are the same as in Example 1. The operation results are shown in Table 5 and Table 6. After refining, the purity of methyl ethyl ketone reaches more than 99.9%, and the yield is 99.9%.

[0037] Table 5 The composition of the top and bottom materials of each tower

[0038]

[0039] Table 6 The feed of each tower and the material flow at the top and bottom of the tower

[0040]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for separating an azeotropic mixture of ethyl methyl ketone and water through variable-pressure rectification, which belongs to the fields of chemical rectification and purification. A first rectifying tower is adopted, a near-azeotropic mixture of the ethyl methyl ketone and the water is obtained at the tower top under corresponding pressure, and wastewater containing a trace amount of ethyl methyl ketone is obtained at the tower bottom, wherein the first rectifying tower is a normal pressure tower; the near-azeotropic mixture of the ethyl methyl ketone and the water obtained at the tower top of the normal pressure tower enters a second rectifying tower, wherein the second rectifying tower is a pressurized tower, the azeotropic mixture of the ethyl methyl ketone and the water is obtained at the tower top under high pressure, the azeotropic mixture returns to the normal pressure tower for feeding, and an ethyl methyl ketone product with high purity is obtained at the tower bottom, wherein the operation pressure of the pressurized tower is 0.5MPa, the number of theoretical plates is 38, the number of rectification sections is 15, and the number of stripping sections is 23; the operation pressure of the normal pressure tower is 0.102MPa, the number of the theoretical plates is 32, the number of the rectification sections is 11, and the number of the stripping sections is 21. The invention reduces the energy consumption in the separating process, improves the purity of the product, improves the yield of the ethyl methyl ketone product and has simple process and reasonable device.

Description

Technical field: [0001] The invention belongs to the field of chemical distillation and purification, and relates to a method for separating methyl ethyl ketone and water by pressure swing distillation. More specifically, it utilizes the characteristic that the azeotropic composition of methyl ethyl ketone and water is sensitive to pressure and adopts two different operating pressures. Rectification tower, a method of purifying methyl ethyl ketone from the azeotrope of methyl ethyl ketone and water. Background technique: [0002] Methyl ethyl ketone (referred to as MEK), also known as methyl ethyl ketone and 2-butanone, is an excellent solvent. It has a strong dissolving ability for various cellulose, synthetic resins, and oils. It is often used as a Solvent. Methyl ethyl ketone is also widely used in the fields of ketone-benzene dewaxing, coatings, adhesives, magnetic tapes, printing inks and chemicals. [0003] Because methyl ethyl ketone and water are partially miscible at low...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/10C07C45/82
Inventor 杨德明
Owner CHANGZHOU UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap