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Recovery technology of tetrahydrofuran

A tetrahydrofuran and process technology, applied in the field of tetrahydrofuran recovery process, can solve the problems of increasing the difficulty of sewage treatment, complicated treatment process, and polluting the environment, and achieve the effects of reducing energy consumption, accelerating distillation speed, and reducing pollution discharge

Inactive Publication Date: 2017-05-17
南通德益化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The industrial waste liquid produced by the pharmaceutical and chemical production using tetrahydrofuran as raw material is treated by atmospheric distillation. Since tetrahydrofuran and water are difficult to separate by azeotropic, it cannot be directly used in production; if these waste liquids are directly discharged into the sewage treatment system, It increases the difficulty of sewage treatment, pollutes the environment, and causes a waste of resources
In the prior art, a variety of tetrahydrofuran recovery and treatment processes have been developed, but these processes are complicated, time-consuming and inefficient. Therefore, it is urgent to develop a recovery process for tetrahydrofuran that is simple in process treatment, short in time and high in efficiency. After retrieval , no technical solution identical or similar to the present invention was found

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The invention discloses a recovery process for tetrahydrofuran, which is specifically as follows:

[0018] (1) Test the concentration of the prepared tetrahydrofuran. When the water content is greater than 10%, pour the tetrahydrofuran into an oil-free vacuum pump for vacuuming;

[0019] (2) Add potassium permanganate to the oil-free vacuum pump, wherein the amount of potassium permanganate added is 0.005% to 0.02% of the mass of tetrahydrofuran, and the oxidation treatment is carried out while stirring, and the stirring time is controlled at 1 to 5 minutes;

[0020] (3) Add manganese dioxide to the oxidized solution and react at a temperature of 20-50°C for 30-50 minutes;

[0021] (4) Pour the solution into a vacuum distiller equipped with a liquid moisture detector for vacuum distillation, collect 0-90% fractions, and finally obtain tetrahydrofuran with a water content of less than 5%.

[0022] The recovery time of tetrahydrofuran needs 55 minutes altogether in the p...

Embodiment 2

[0024] The invention discloses a recovery process for tetrahydrofuran, which is specifically as follows:

[0025] (1) Test the concentration of the prepared tetrahydrofuran. When the water content is greater than 10%, pour the tetrahydrofuran into an oil-free vacuum pump for vacuuming;

[0026] (2) Add potassium permanganate to the oil-free vacuum pump, where the amount of potassium permanganate added is 0.02% to 0.1% of the mass of tetrahydrofuran, and carry out oxidation treatment while stirring, and the stirring time is controlled at 5 to 10 minutes;

[0027] (3) Add manganese dioxide to the oxidized solution and react at a temperature of 50-65°C for 30-50 minutes;

[0028] (4) Pour the solution into a vacuum distiller equipped with a liquid moisture detector for vacuum distillation, collect 0-90% fractions, and finally obtain tetrahydrofuran with a water content of less than 5%.

[0029] The recovery time of tetrahydrofuran needs 32 minutes altogether in the present embod...

Embodiment 3

[0031] The invention discloses a recovery process for tetrahydrofuran, which is specifically as follows:

[0032] (1) Test the concentration of the prepared tetrahydrofuran. When the water content is greater than 10%, pour the tetrahydrofuran into an oil-free vacuum pump for vacuuming;

[0033] (2) Add potassium permanganate to the oil-free vacuum pump, where the amount of potassium permanganate added is 0.1% to 0.2% of the mass of tetrahydrofuran, and carry out oxidation treatment while stirring, and the stirring time is controlled at 5 to 10 minutes;

[0034] (3) Add manganese dioxide to the oxidized solution and react at a temperature of 65-80°C for 30-50 minutes;

[0035] (4) Pour the solution into a vacuum distiller equipped with a liquid moisture detector for vacuum distillation, collect 0-90% fractions, and finally obtain tetrahydrofuran with a water content of less than 5%.

[0036] The recovery time of tetrahydrofuran needs 44min altogether in the present embodiment....

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Abstract

The invention relates to a recovery technology of tetrahydrofuran. The technology comprises the following steps: firstly testing concentration of prepared tetrahydrofuran, and pouring tetrahydrofuran into an oilless vacuum pump when water content is greater than 10% and carrying out vacuum-pumping treatment; adding potassium permanganate into the oilless vacuum pump, stirring while carrying out oxidation treatment; adding a catalyst into the solution obtained after oxidization, reacting at the temperature of 50-65 DEG C for 30-50 min; and finally pouring the solution into a reduced pressure distiller and carrying out reduced pressure distillation, collecting 0-90% of a fraction, and finally obtaining tetrahydrofuran with water content being less than 5%. The invention has the following advantages: by adding a special oxidizing agent, oxidizability index of tetrahydrofuran meets the quality standard, distillation frequency is reduced, and energy consumption is decreased; by the use of the oilless vacuum pump for vacuum-pumping, clean exhausted gas is obtained; by additionally arranging an exhausted gas recovery system for condensation and recovery of tetrahydrofuran, pollutant discharge is reduced; and through cooperation of the above operations, recovery yield of tetrahydrofuran is increased.

Description

technical field [0001] The invention relates to a recovery process of tetrahydrofuran, which belongs to the field of recovery and treatment of chemical substances. Background technique [0002] Tetrahydrofuran is an organic solvent with excellent performance, which is widely used in pharmaceutical and chemical production. The industrial waste liquid produced by the pharmaceutical and chemical production using tetrahydrofuran as raw material is treated by atmospheric distillation. Since tetrahydrofuran and water are difficult to separate by azeotropic, it cannot be directly used in production; if these waste liquids are directly discharged into the sewage treatment system, It increases the difficulty of sewage treatment, pollutes the environment, and causes waste of resources. In the prior art, a variety of tetrahydrofuran recovery and treatment processes have been developed, but these processes are complicated, time-consuming and inefficient. Therefore, it is urgent to deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/08
CPCC07D307/08
Inventor 贾庆山马海兵
Owner 南通德益化工有限公司
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