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Novel reactive distillation process for separating methyl acetate hydrolysate by dividing wall column

A methyl acetate and reactive distillation technology, applied in the field of chemical rectification, can solve the problems of high energy consumption in a recovery and circulation system, low methyl acetate conversion rate, etc., reduce energy consumption and equipment investment costs, and improve single-pass conversion rate. Effect

Pending Publication Date: 2020-09-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The undecomposed methyl acetate is separated and hydrolyzed again, so that it participates in the reaction for many times until it is completely hydrolyzed. The conversion rate of methyl acetate in this process is low, and the energy consumption of the recovery cycle system is relatively high.

Method used

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  • Novel reactive distillation process for separating methyl acetate hydrolysate by dividing wall column
  • Novel reactive distillation process for separating methyl acetate hydrolysate by dividing wall column
  • Novel reactive distillation process for separating methyl acetate hydrolysate by dividing wall column

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The lower part of the reaction section enters a 6:5 mixture of methyl acetate to methanol at 200 kmol / h, and the upper part enters 300 kmol / h of water. The number of plates in the reaction section is 40 plates, and the number of plates in the stripping section is 22 plates. The temperature in the reaction section is 70°C, the reflux ratio is 3.2, each plate is stacked with resin catalyst filler, the loading amount of catalyst on each plate is 32kg, the single-pass conversion rate of methyl acetate hydrolysis is 99%, and the throttling valve The throttling ratio is 1:0.35. The number of trays in the pre-separation section and sideline extraction section of the dividing wall tower is 70 plates, the number of trays in the common rectification section is 20 plates, the number of trays in the common stripping section is 30 plates, and the reflux ratio is 0.7. The overhead product of the dividing wall tower is 200.9kmol / h of methanol with 99% molar concentration, 76.4kmol of...

Embodiment 2

[0025] The lower part of the reaction section enters a 2:1 mixture of methyl acetate to methanol at 150 kmol / h, and the upper part enters 280 kmol / h of water. There are 35 plates in the reaction section and 21 plates in the stripping section. The temperature in the reaction section is 72°C, the reflux ratio is 2.8, each plate is stacked with resin catalyst packing, the loading amount of catalyst on each plate is 27kg, the single-pass conversion rate of methyl acetate hydrolysis is 99%, and the throttling valve The throttling ratio is 1:0.42. The number of trays in the pre-separation section and sideline extraction section of the dividing wall tower is 65 plates, the number of trays in the common rectification section is 15 plates, the number of trays in the common stripping section is 35 plates, and the reflux ratio is 0.85. The overhead product of the dividing wall tower is 150.5 kmol / h of methanol with 99% molar concentration, 70 kmol of acetic acid with 99% molar concentra...

Embodiment 3

[0029] The lower part of the reaction section enters 320 kmol / h of 15:4 mixture of methyl acetate to methanol, and the upper part enters 600 kmol / h of water. The number of plates in the reaction section is 45 plates, and the number of plates in the stripping section is 28 plates. The temperature in the reaction section is 81°C, the reflux ratio is 3.5, each plate is stacked with resin catalyst filler, the loading amount of catalyst on each plate is 40kg, the single-pass conversion rate of methyl acetate hydrolysis is 99.6%, and the throttling valve The throttling ratio is 1:0.7. The number of trays in the pre-separation section and sideline extraction section of the dividing wall tower is 82 plates, the number of trays in the common rectification section is 40 plates, the number of trays in the common stripping section is 52 plates, and the reflux ratio is 1.5. The overhead product of the dividing wall tower is methanol 321.6kmol / h of 99.2% molar concentration, acetic acid 17...

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Abstract

The invention relates to a novel reactive distillation process for separating a methyl acetate hydrolysate by a dividing wall column. A device comprises a reactive distillation tower for generating amethyl acetate hydrolysis reaction and a dividing wall column for separating the methyl acetate hydrolysate. An azeotrope of methyl acetate and methyl alcohol enters the lower part of the reaction section of the reactive distillation tower, and water is added into the upper part of the reaction section. Tower top products of the reactive distillation tower comprise methyl acetate and methyl alcohol, and tower bottom products comprise methyl alcohol, water and acetic acid. A tower bottom product is decompressed and then enters the dividing wall column for separation of the three products including methyl alcohol, water and acetic acid. A high-concentration methyl alcohol product is obtained at the top of the dividing wall column, a high-concentration acetic acid product is obtained at the bottom of the dividing wall column, and water and part of acetic acid are obtained laterally. The process has the advantages that methyl acetate circulates in the reactive distillation tower, the one-way conversion rate is increased, and the tower kettle does not contain methyl acetate. The dividing wall column is used for separating the three products of methyl alcohol, water and acetic acid, so that the energy consumption and the equipment investment cost are reduced.

Description

technical field [0001] The invention belongs to the field of chemical distillation, and relates to methyl acetate hydrolysis technology, in particular to a novel reactive distillation process for separating methyl acetate hydrolyzate in a dividing wall tower. Background technique [0002] A large amount of by-product methyl acetate will be produced in the production process of polyvinyl alcohol (PVA), but the industrial use of methyl acetate is relatively limited, and 1.5-1.7 tons of methyl acetate will be produced for every ton of polyvinyl alcohol produced per liter , but the product of the hydrolysis reaction has a higher value, so it is very important to hydrolyze methyl acetate and utilize its product. At home and abroad, ion exchange resin is usually used as a fixed bed catalyst to hydrolyze methyl acetate, and then rectification is used to separate the components. The undecomposed methyl acetate is separated and hydrolyzed again, so that it participates in the reacti...

Claims

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Application Information

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IPC IPC(8): C07C51/09C07C51/44C07C53/08C07C29/09C07C31/04C07C29/80B01D3/14B01D3/36
CPCC07C51/09C07C51/44C07C29/095C07C29/80B01D3/009B01D3/14B01D3/36C07C53/08C07C31/04Y02P20/10
Inventor 从海峰李鑫钢何林李洪高鑫陈颢
Owner TIANJIN UNIV
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