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Water-containing tetrahydrofuran refining method

A water-containing tetrahydrofuran and tetrahydrofuran technology, which is applied in organic chemistry and other fields, can solve problems such as high energy consumption, hidden dangers of explosion accidents, complex process flow, etc., and achieve the effect of low energy consumption and simple production process

Inactive Publication Date: 2017-12-01
天津九源化工工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Tetrahydrofuran (THF) solvent has a boiling point of 66°C. It is an important organic synthesis raw material and polymer monomer. It has excellent performance and can be miscible with most organic solvents. It has been widely used due to its excellent characteristics such as good resistance, but the price is more expensive.
The tetrahydrofuran product with water content lower than the azeotropic composition cannot be obtained by ordinary rectification
At present, pressure swing azeotropic distillation and extractive distillation dehydration are mostly used to produce THF at home and abroad, but there are disadvantages such as complex process flow, large equipment investment, difficult operation control, and high energy consumption; in addition, tetrahydrofuran will be oxidized when it contacts with air. Form peroxide, there is a hidden danger of explosion accidents, avoid contact with air or add stabilizers during the production process, the market demand for high-purity THF is expanding at home and abroad

Method used

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  • Water-containing tetrahydrofuran refining method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] In this example, a tetrahydrofuran raw material solution with a water content of 1wt% is used to produce a tetrahydrofuran product with a water content of 0.005wt%. For the operation steps, see a schematic flow chart of a method for refining tetrahydrofuran containing water. figure 1 ), the main equipment includes THF dehydration tower 1; reboiler 2; superheater 3; regeneration condensate preheater 4; adsorber 5A / 5B; Regeneration condenser 9; regeneration condensate tank 10; nitrogen heater 11, etc., valves and corresponding pipelines are arranged between each equipment, and the specific operations are described as follows:

[0045] The aqueous tetrahydrofuran raw material liquid is first preheated by the raw material preheater and then sent to the top feed port of the THF dehydration tower. The preheating temperature of the aqueous tetrahydrofuran raw material liquid is controlled by adjusting the cooling medium flow rate of the THF product condenser, and the temperatur...

Embodiment 2

[0053] In this example, a tetrahydrofuran raw material solution with a water content of 15wt% is used to produce a tetrahydrofuran product with a water content of 0.1wt%. For the operation steps, see a schematic flow chart of a method for refining tetrahydrofuran containing water. figure 1 ), the main equipment includes THF dehydration tower 1; reboiler 2; superheater 3; regeneration condensate preheater 4; adsorber 5A / 5B; Regeneration condenser 9; regeneration condensate tank 10; nitrogen heater 11, etc., valves and corresponding pipelines are arranged between each equipment, and the specific operations are described as follows:

[0054] The aqueous tetrahydrofuran raw material liquid is first preheated by the raw material preheater and then sent to the top feed port of the THF dehydration tower. The preheating temperature of the aqueous tetrahydrofuran raw material liquid is controlled by adjusting the cooling medium flow rate of the THF product condenser, and the temperature...

Embodiment 3

[0062] In this example, a tetrahydrofuran raw material solution with a water content of 8wt% is used to produce a tetrahydrofuran product with a water content of 0.01wt%. For the operation steps, see a schematic flow chart of a method for refining tetrahydrofuran containing water. figure 1 ), the main equipment includes THF dehydration tower 1; reboiler 2; superheater 3; regeneration condensate preheater 4; adsorber 5A / 5B; Regeneration condenser 9; regeneration condensate tank 10; nitrogen heater 11, etc., valves and corresponding pipelines are arranged between each equipment, and the specific operations are described as follows:

[0063] The aqueous tetrahydrofuran raw material liquid is first preheated by the raw material preheater and then sent to the top feed port of the THF dehydration tower. The preheating temperature of the aqueous tetrahydrofuran raw material liquid is controlled by adjusting the cooling medium flow rate of the THF product condenser, and the temperature...

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Abstract

The invention relates to a water-containing tetrahydrofuran refining method. The water-containing tetrahydrofuran refining method is characterized by utilizing technologies of a multifunctional tetrahydrofuran dewatering tower, a filler and plate type tower compound refining tower, pressure swing adsorption, steam stripping adsorption, multilevel and multi-effect energy utilization and the like; by means of the multifunctional tetrahydrofuran dewatering tower, vaporizing a tetrahydrofuran feed solution and dewatering and recycling water-enrichment tetrahydrofuran regenerated resolved condensate are integrated; by means of a tetrahydrofuran refining dewatering and adsorbing dewatering operation unit, a production process for producing a tetrahydrofuran product with a low water content from the tetrahydrofuran feed solution formed by azeotropy with a similar water concentration is achieved; the production process has the advantages of simpleness and convenience and low energy consumption; a tetrahydrofuran refining dewatering operation process has intrinsic safety; the problems that further refining and azeotropy water removing operation to the water-containing tetrahydrofuran feed solution close to tetrahydrofuran and water azeotropy cannot use a general refining technology and an extractive distillation technology has the problems of complex technology, steam consumption, large equipment investment, high operation cost and the like are effectively solved; the water-containing tetrahydrofuran refining method has stronger market popularization prospect.

Description

technical field [0001] The invention relates to a method for refining aqueous tetrahydrofuran, and the technical field belongs to the technical field of separation of chemical products Background technique [0002] Tetrahydrofuran (THF) solvent has a boiling point of 66°C. It is an important organic synthesis raw material and polymer monomer. It has excellent performance and can be miscible with most organic solvents. It has been widely used due to its excellent characteristics such as good resistance, but the price is more expensive. In chemical, pharmaceutical and other industries, tetrahydrofuran often coexists with water and other organic solvents. Under normal pressure, THF and water form an azeotrope with the lowest temperature. The constant boiling temperature is 64°C and the water content is 5.8wt%. The tetrahydrofuran product with water content lower than the azeotropic composition cannot be obtained by ordinary rectification. At present, pressure swing azeotropic...

Claims

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Application Information

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IPC IPC(8): C07D307/08
CPCC07D307/08
Inventor 时锋李永辉耿中峰吕惠生
Owner 天津九源化工工程有限公司