Method for separating methanol-toluene azeotrope through continuous extractive distillation

A technology of extractive distillation and extractive distillation column, which is applied in the field of continuous extraction and distillation to separate methanol-toluene azeotrope, and can solve problems such as not being suitable for continuous production

Pending Publication Date: 2021-05-11

SHANDONG UNIV OF SCI & TECH

20 Cites 0 Cited by

AI-Extracted Technical Summary

Problems solved by technology

This method uses batch extraction and rectificatio...

Abstract

The invention discloses a method for separating methanol-toluene azeotrope through continuous extractive distillation. According to the method, butyl butyrate is used as an extraction agent, a continuous extractive distillation method is adopted to separate a methanol-toluene azeotropic mixture, methanol and toluene are mixed and fed, the reflux ratio is 0.5-1.5, the molar flow ratio of the extraction agent to raw materials is 0.5-2, the fraction at the top of an extractive distillation tower is a methanol product, the fraction at the bottom of the extractive distillation tower is a mixture of toluene and the extraction agent, discharging from the tower bottom into a solvent recovery tower is carried out, toluene is obtained from the tower top of the solvent recovery tower, an extracting agent is obtained from the tower bottom, and the extracting agent can be recycled. The method disclosed by the invention is simple in process, low in cost, easy to operate, high in continuous rectification efficiency and simple in solvent recovery, the molar fraction of the treated methanol and toluene products is not less than 0.999, and the method can be industrially applied.

Application Domain

Organic compound preparationDistillation purification/separation +2

Technology Topic

Process engineeringToluene +8

Image

Examples

Experimental program(4)

Example Embodiment

[0029]Example 1

[0030]Such asfigure 1The desired distillation flow is extracted. The extraction rectification column T1 Theory is 50 pieces, and the extractant butyrate S is added from the 8th sheet, a mixture of 100 kmol / h, methanol and toluene (0.5) f from the 30th block. The plate is added, the flow is 100kmol / h. The extraction rectification column T1 is operated under normal pressure, the reflow ratio is 0.8, the sum of the colors is 49.985 kmol / h, and the molar fraction of 0.999 is obtained in the top of the colors, and the toluene and extract butyl butylate are obtained. Mixture w, from the 18th tower to the solvent recovery tower T2, the solvent recovery tower T2 theoretical tower number is 30 pieces, the reflow ratio is 1.2, the top of the column is 49.96 kmol / h, and the top of the coloremola is obtained. The toluene of 0.999, the bottom of the coloremola is butyrate butyric acid butyrate, and the extraction agent S is mixed with the extractant S logistics.

Example Embodiment

[0031]Example 2

[0032]Such asfigure 1The desired distillation flow is extracted. The number of colored tower T1 T1 is 46 pieces, and butyl butyrate S is added from the 10th sheet, the flow rate is 80 kmol / h, mixture of methanol (0.2+ toluene 0.8) f from the 32nd block. The plate is added, the flow is 100kmol / h. The extraction rectification column T1 is operated under normal pressure, and the reflow ratio is 0.6, the sum of the colors is 20.739 kmol / h, and the molar fraction of 0.999 is obtained in the top of the colors, and the toluene and extract butyrate Mixture W, from the 12th tower to the solvent recovery tower T2, the number of solvent recovery tower T2 theoretical tray is 28, the reflow ratio is 0.95, the top of the tower is 79.228kmol / h, the top of the coloremola is The toluene of 0.999, the bottom of the coloremola is butyrate butyric acid butyrate, and the extraction agent S is mixed with the extractant S logistics.

Example Embodiment

[0033]Example 3

[0034]Such asfigure 1The desired distillation flow is extracted. The number of colored tower T1 T1 is 52 pieces, and the extractant butyrate S is added from the 12th sheet plate, a mixture of 115 kmol / h, methanol and toluene (0.65) F from the 38th block. The plate is added, the flow is 100kmol / h. The extraction rectification column T1 is operated under normal pressure, the reflow ratio is 1.25, and the sum of the top of the tower is 34.96 kmol / h, and the molar fraction of 0.999 is obtained in the top of the column, and the toluene and extract butyl butyl butyl icyter are obtained. Mixture W, from the 18th tower to the solvent recovery tower T2, the solvent recovery tower T2 theoretical tower number is 33 pieces, the reflow ratio is 1.6, the sum of the column is 64.93kmol / h, and the top of the coloremola is obtained. The toluene of 0.999, the bottom of the coloremola is butyrate butyric acid butyrate, and the extraction agent S is mixed with the extractant S logistics.

PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.