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Method for preparing methyl acetate, and reaction rectification tower possessing spatial column plates of mass transfer

A technology of three-dimensional mass transfer trays and reactive distillation towers, applied in fractionation, organic chemistry, etc., can solve the problems of large liquid layer height drop, uneven liquid layer drop, entrainment of mist, etc., and improve liquid holding capacity. , the effect of improving the generation efficiency

Active Publication Date: 2008-05-21
SHANGHAI HUAYI ENERGY CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large liquid holding capacity of the tray, the height drop of the liquid layer on the tray is relatively large, resulting in uneven pressure drop of the liquid layer on the tray. At the same time, when it is used to prepare methyl acetate, it is also prone to mist entrainment. must be improved

Method used

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  • Method for preparing methyl acetate, and reaction rectification tower possessing spatial column plates of mass transfer
  • Method for preparing methyl acetate, and reaction rectification tower possessing spatial column plates of mass transfer
  • Method for preparing methyl acetate, and reaction rectification tower possessing spatial column plates of mass transfer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0031] use as figure 1 , figure 2 and image 3 In the shown reactive distillation tower, methanol and acetic acid are fed into the reactive distillation tower from the lower and upper parts respectively, and sulfuric acid is fed into the reactive distillation tower from the middle.

[0032] The outlet weir is a toothed structure, and the height of the outlet weir is 200mm;

[0033] The tray spacing is 450mm;

[0034] The number of trays in the reaction section is 21;

[0035] 14 trays in the rectification section;

[0036] There are 18 trays in the extraction section;

[0037] Raw material molar ratio: methanol: acetic acid=1.2;

[0038] The amount of sulfuric acid added was 0.6% of the total feed weight of methanol and acetic acid. Using different reflux ratios, the results are shown in the table below

[0039] Reflux ratio

Embodiment 5

[0041] Using the same method and device as in Examples 1 to 4, the number of trays in the reaction section is 29, the molar ratio of raw material feed: methanol / acetic acid=1.0, the reflux ratio is controlled at 1.1, and the content of methyl acetate obtained at the top of the tower is 99.5 %.

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Abstract

This invention publishes a preparation method for methyl acetate and a reaction distillation column with combined trapezoid spray trays. It is unique that the height / spacing ratio of exit weir is 0.2~0.5:1 and the height of exit weir is 40~200mm. The reaction distillation column with combined trapezoid spray trays in this invention being adopted, liquid holdup on the trays would be significantly improved without obvious distillation entrainment, single-column yield would be significantly promoted and the purity of methyl acetate product on the top of the column can be over 99.3%.

Description

technical field [0001] The invention relates to a method and equipment for preparing methyl acetate by reactive distillation, in particular to a method for preparing methyl acetate by using a reactive distillation column with three-dimensional mass transfer trays. technical background [0002] Methyl acetate is one of the raw materials for carbonylation to produce acetic anhydride. It is also a good solvent, which is used in the production of various fibers, resins, oils and synthetic leathers such as cellulose nitrate and cellulose acetate, and is also suitable for the production of flavors. [0003] Under the action of acidic catalyst, acid and alcohol generate water and corresponding ester, which is a reversible reaction. Among acetates, acetic acid and methanol are used as raw materials, and acid is used as catalyst to generate methyl acetate. The equilibrium constant is the highest, which is 5.2, the chemical equilibrium can be reached only when methanol and acetic aci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/14B01D3/18
Inventor 金柳伟李柏春陈墨庆李峻岭崔伟
Owner SHANGHAI HUAYI ENERGY CHEM
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