Synthetic process method of methyl acetate and apparatus thereof

A technology of methyl acetate and synthesis device, which is applied in the preparation of carboxylate, chemical instruments and methods, chemical industry, etc., can solve problems such as unfavorable economic benefits, remixing, low thermodynamic efficiency and the like

Inactive Publication Date: 2008-12-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] But the above-mentioned reactive distillation technology still has certain defects: excess methanol and reaction product water and a small amount of sulfuric acid are all extracted from the tower kettle, and cannot be effectively separated. After the reactive distillation tower, the reaction product must be further separated through the subsequent rectification tower, and there will be remixing of the intermediate component methanol in the conventional distillation process, and the thermodynamic efficiency is low, especially when the excess of methanol is large. The disadvantage is more obvious
This leads to high energy consumption and equipment investment, which is not conducive to improving economic benefits

Method used

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  • Synthetic process method of methyl acetate and apparatus thereof
  • Synthetic process method of methyl acetate and apparatus thereof
  • Synthetic process method of methyl acetate and apparatus thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] Example 1: if figure 2 process shown. The number of theoretical plates, feed flow and composition of each area are shown in Table 1. The cross-sectional area ratio of the stripping section (4) and the side rectification section (5) is 3.4:1, and the molar ratio of methanol feed to acetic acid feed is The feed mass ratio of concentrated sulfuric acid and acetic acid is 1:100, and the feed positions of acetic acid, concentrated sulfuric acid and methanol (counting from top to bottom) are the seventh theoretical board on the left and the fifteenth on the left The theoretical plate and the 36th theoretical plate on the left are both fed at 30°C. The reflux ratio at the top of the tower is 1.16, and the reflux ratio at the side line is 1.42. The flow rate and composition of each stream are shown in Table 1. The resulting acetic acid conversion was 99.78%. The number of theoretical plates in the rectification section (1) and the side line rectification section (5) includes...

example 2

[0023] Example 2: if figure 2process shown. Feed composition, feed heat state, feed position and the number of theoretical plates in each area are the same as example 1, but methanol feed and acetic acid feed molar ratio become 1.4: 1, stripping section (4) and side line rectifying section ( 5) The cross-sectional area ratio is 2.1:1. The top reflux ratio is 1.19, and the side reflux ratio is 1.67. The flow rate and composition of each stream are shown in Table 2. The resulting acetic acid conversion was 99.75%.

[0024] Table 2 Example 2 Each logistics mass flow rate and each component mass fraction

[0025] Extraction / feeding department

example 3

[0026] Example 3: if figure 2 process shown. Except that the methanol feed is a mixture containing a small amount of impurity water with a methanol mass fraction of 98%, the composition of the feed, the thermal state of the feed, the position of the feed and the number of theoretical plates in each area are the same as in Example 1, and the stripping section (4) and the side line The cross-sectional area ratio of the rectifying section (5) is 3.6:1. The top reflux ratio is 1.14, and the side reflux ratio is 1.52. The flow rate and composition of each stream are shown in Table 3. The resulting acetic acid conversion was 99.78%.

[0027] Table 3 Example 3 Each logistics mass flow rate and each component mass fraction

[0028] Extraction / feeding department

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Abstract

The invention discloses a process method for synthesizing methyl acetate by utilizing a reactive distillation partition wall tower and a device thereof. The reactive distillation partition wall tower is provided with a partition wall in a vertical direction inside the prior distillation tower, the upper part of the right side of the partition wall is sealed and the whole tower is divided into six areas. Acetic acid is added from the top of an area (2), a catalyst of concentrated sulfuric acid is added from the bottom of the area (2), excessive methanol is added from the middle part of an area (3), the esterification reaction is performed in the area (3) to produce methyl acetate, a methyl acetate product with high purity is produced at the tower top, the excessive methanol is reclaimed on the lateral line, and waste water containing a small amount of sulphuric acid is discharged from a column reactor. The process gives full play to the advantages of the partition wall tower and the reactive distillation, and ensures that the esterification, the product extraction and the reclaiming of the excessive methanol are realized in one towel, thereby greatly reducing the investment on equipment and energy consumption.

Description

technical field [0001] The invention relates to a reactive distillation process and its device, in particular to a novel process and device for synthesizing methyl acetate using a rectifying column next to the wall, which can synthesize methyl acetate, product separation and unreacted The recovery of the coal is combined in one tower. Background technique [0002] Methyl acetate is widely used in industry. It is one of the raw materials for carbonylation to produce acetic anhydride, and it is also a good solvent. The main production method is the esterification reaction of acetic acid and methanol under the action of a catalyst to obtain methyl acetate. ester. The reaction is a reversible reaction, mainly limited by the equilibrium constant, which is 5.2. Said catalyst is an acidic catalyst, which can be hydrochloric acid, sulfuric acid, phosphoric acid and p-toluenesulfonic acid, or acidic resin. [0003] The traditional production process of methyl acetate is: add aceti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/14C07C67/08B01J19/24
CPCY02P20/10
Inventor 孙兰义杨德连李军
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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