Method and production equipment for variable-pressure distillation and purification of methyl acetate

A technology of methyl acetate and pressure swing rectification, applied in the chemical industry, can solve the problems of difficult solvent recovery, low product purity and high energy consumption, and achieve the effects of high product purity, high yield and low energy consumption

Inactive Publication Date: 2013-05-15
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the deficiency of above-mentioned technology, provide a kind of method and production equipment thereof of pressure swing rectification purification methyl acetate, this pressure swing rectification method and production equipment of purification methyl acetate not only realize energy saving and consumption reduction It also solves the problems of low product purity, difficult solvent recovery, introduction of the third component and high energy consumption in processes such as salt extraction and extractive distillation.

Method used

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  • Method and production equipment for variable-pressure distillation and purification of methyl acetate

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Embodiment 1

[0034] Attached figure 1 In the process flow shown, the feed flow rate is 3200kg / h, the feed temperature is 50°C, and the feed composition is: 96% methyl acetate, 0.2% methanol, 3.5% water, and 0.3% sec-butyl acetate. The body material of the pressurized distillation tower T1 is SUS304, the tower is filled with CY700 regular wire mesh corrugated packing, the number of theoretical plates is 40, and the 22nd block is fed. Operating conditions: operating pressure 0.4MPa, tower top temperature 93.2 ℃, tower bottom The temperature is 98.4°C, the reflux ratio is 1; the material of the atmospheric distillation column T2 is SUS304, and the column is filled with CY700 regular wire mesh corrugated packing, the number of theoretical plates is 36, and the 18th block is fed. Operating conditions: operating pressure 0.1MPa, The temperature at the top of the tower is 56.4°C, the temperature at the bottom of the tower is 57.5°C, and the reflux ratio is 1.5; the material of the methyl acetate ...

Embodiment 2

[0038] Attached figure 1 In the process flow shown, the feed flow rate is 1600kg / h, the feed temperature is 53°C, and the feed composition is: 91.2% methyl acetate, 3.1% methanol, 5.4% water, and 0.3% sec-butyl acetate. The body material of the pressurized distillation tower T1 is SUS304, the tower is filled with CY700 regular wire mesh corrugated packing, the number of theoretical plates is 38, and the 20th block is fed. The temperature is 99.8°C, the reflux ratio is 1; the body material of the atmospheric distillation column T2 is SUS304, and the column is filled with CY700 regular wire mesh corrugated packing, the number of theoretical plates is 36, and the 18th block is fed. Operating conditions: operating pressure 0.1MPa, The temperature at the top of the tower is 56.4°C, the temperature at the bottom of the tower is 57.5°C, and the reflux ratio is 1.5; the material of the methyl acetate refining tower T3 is SUS304, and the tower is filled with CY700 regular wire mesh cor...

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Abstract

The invention relates to a method and production equipment for variable-pressure distillation and purification of methyl acetate. The method mainly comprises the following step of: carrying out variable-pressure distillation and separation on a mixed solution of methyl acetate, methanol and water through a pressurized distillation column, an atmospheric distillation column and a methyl acetate refining column. The fundamental principle is as follows: by utilizing the characteristic that the sensitivity of azeotropic compositions of methyl acetate-methanol and methyl acetate-water is changed along with the pressure variation, the separation and purification of the mixed solution of the methyl acetate, the methanol and the water are realized by adopting the distillation columns with different operating pressures and the purposes of energy conservation and consumption reduction are realized through heat integration, so that the problems that conventional processes of salt extraction, extractive distillation and the like are low in product purity, difficult in solvent recovery and higher in energy consumption and have need for introducing the third component and the like are solved. Therefore, the method disclosed by the invention has the advantages of high methyl acetate yield, high product purity, simple process, low energy consumption and the like.

Description

technical field [0001] The invention belongs to rectification and purification in the field of chemical industry, and relates to a method for purifying methyl acetate by pressure swing rectification and production equipment thereof. Background technique [0002] Methyl acetate (MA for short), also known as methyl acetate, is a colorless, transparent, aromatic liquid with excellent solubility, fast drying and low toxicity. It is an important organic solvent and chemical raw material. Solvents are widely used in the production of resins, coatings, inks, paints, adhesives, and leather. High-purity methyl acetate can be used as raw materials for the production of polyester, acetic anhydride, and acetamide. The current market demand is large and the price is high. Therefore, The production of high-purity methyl acetate has great economic benefits. [0003] In the production process of polyvinyl alcohol (PVA), the raw material polyvinyl acetate (PVAc) is hydrolyzed to generate PV...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/14C07C67/54B01D3/14
Inventor 邱挺叶长燊李玲王红星黄智贤
Owner FUZHOU UNIV
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