Intermittent extractive distillation separation method of methanol-methyl propionate azeotropic mixtures

A technology of azeotropic mixture and methyl propionate, which is applied in the field of batch extraction, rectification and separation, can solve problems that have not been seen before, and achieve the effect of flexible operation and low equipment investment

Inactive Publication Date: 2012-07-18
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many articles and patents on extractive distillation, but there is no published information on extractive distillation and separation of methanol-methyl propionate azeotropic system

Method used

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  • Intermittent extractive distillation separation method of methanol-methyl propionate azeotropic mixtures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Using a batch extractive distillation device, put 500L methanol-methyl propionate azeotropic mixture into the heating kettle (48% methanol, 52% methyl propionate, both are mass percentages). The selected extractant for the experiment is toluene, and the heating is turned on. The heat source of the kettle and the cold source of the condenser. After the top of the extractive distillation tower has been refluxed for a period of time, the temperature at the top of the tower is stable. Add the extractant. The feed position of the extractant is near the top of the tower. Control the addition rate of the extractant to 500L / h, with total reflux Operation, when the top temperature of the extractive distillation tower is 64.2-66°C, the methanol content in the distillate is greater than or equal to 99% to start discharging, the reflux ratio is 3:1, and the discharging speed is 200L / h. When the temperature at the top of the extractive distillation tower is 66-79°C, produce the methan...

Embodiment 2

[0013] Using a batch extractive distillation device, put 500L methanol-methyl propionate azeotropic mixture into the heating kettle (42% methanol and 58% methyl propionate, both are mass percentages). The selected extractant for the experiment is ethylene glycol. Turn on the heat source of the heating kettle and the cold source of the condenser. After the top of the extractive distillation tower is refluxed for a period of time, the temperature at the top of the tower is stable, and the extractant is added. The feed position of the extractant is near the top of the tower, and the extraction rate is controlled to 800L / h. Full reflux operation, when the top temperature of the extractive distillation tower is 64.2-66°C, the methanol content in the distillate is greater than or equal to 99% to start discharging, the reflux ratio is 2:1, and the discharging speed is 300L / h. When the temperature at the top of the extractive distillation tower is 66-79°C, produce the methanol-methyl pr...

Embodiment 3

[0015] The experimental device and operation method were the same as in Example 2, and the extractant was glycerol.

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Abstract

The invention discloses an intermittent extractive distillation separation method of methanol-methyl propionate azeotropic mixtures, which belongs to the separation technology of the methanol-methyl propionate azeotropic mixtures and includes: ethylene glycol, 1,2-propylene glycol, glycerol, anisole and toluene or chlorobenzene are used as extracting agents, under operation conditions of an extracting rectifying tower, mass ratio of the extracting agents and overhead distillate is 0.5:1-10:1at ordinary pressure or reduced pressure, feeding temperature of the extracting agents is 20-60 DEG C, different temperatures and different reflux ratios at the top of the extracting rectifying tower are controlled, methanol products, a methanol-methyl propionate transition section I, methyl propionate products and a methyl propionate-extracting agent transition section II are respectively picked out through the extracting rectifying tower, and when extracting agent components of a heating kettle meet requirements, the extracting agents are pumped into a high-level storage groove and materials are fed for the next intermittent extractive distillation separation. The intermittent extractive distillation separation method has the advantages that the single tower is low in device cost and flexible in operation, and the extracting agents are adopted to damage a methanol-methyl propionate azeotropic system to separate out high-purity methanol products and high-purity methyl propionate products.

Description

Technical field [0001] The invention relates to an intermittent extractive distillation separation method of methanol-methyl propionate azeotropic mixture, belonging to the separation technology of methanol-methyl propionate azeotropic mixture. Background technique [0002] Extractive distillation is a special distillation separation technology suitable for separation in azeotropic systems. The separation is achieved by continuously adding extractant to the top of the rectification tower to change the relative volatility of the original components. Batch extractive distillation combines the advantages of batch distillation and extractive distillation, flexible operation, multiple components can be separated through one tower, equipment investment is small, and it is suitable for the separation of small batches of azeotropic systems and near-boiling systems. The chemical structure of methyl propionate is: C 4 H 8 O 2 , Used as a solvent and manufacturing spices, can also be used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/84C07C31/04C07C67/54C07C69/24
Inventor 姜占坤孙国新袁美龙夏光明
Owner UNIV OF JINAN
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