Preparation method for continuous production of 1,2-pentanediol

A technology of pentanediol and pentene, which is applied in the field of synthesis and preparation of chemical products, can solve the problems of high cost, many hours of work, and non-continuous production, etc., and achieve the effects of increasing reaction rate, saving power consumption, and reducing reaction rate

Inactive Publication Date: 2017-02-15
巫燕飞
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has harsh requirements on the reaction equipment and production process of the bromination reaction, produces a large amount of waste water and waste gas, is difficult to handle, has high cost, serious environmental pollution, consumes many man-hours, and the post-processing operation is loaded down with trivial details, so it is difficult to form large-scale production; The first is n-pentanol method, using n-pentanol as raw material, through hydrolysis, oxidation, hydrolysis and neutralization to obtain 1,2-pentanediol
This method cannot be produced continuously, it is intermittent, the plant covers a large area, the labor cost is high, the output is small, the reaction efficiency is low, and it cannot be mass-produced
In addition, some literature reports that sodium hydroxide is used for hydrolysis and neutralization to prepare 1,2-pentanediol, but a large amount of salt is produced when the method is finally concentrated, resulting in low yield, and sodium hydroxide itself is too alkaline. When a large amount of heat is released, there is a greater safety hazard in production

Method used

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  • Preparation method for continuous production of 1,2-pentanediol

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Embodiment 1

[0021] A method for continuous production of 1,2-pentanediol

[0022] Specific steps are as follows:

[0023] The pipeline reactor is equipped with two feed ports, feed port 1 and feed port 2, and there is a pipe reactor with stirring connected to feed port 1; formic acid (commercially available) 870kg, hydrogen peroxide (50%) 650kg was stirred and mixed evenly, and then passed into the pipeline through feed port 1, and 470kg of 1-pentene was fed into feed port 2, heated to 20°C-30°C, kept for 2 hours, and sampled for TLC (developing agent is ethyl acetate: Ethanol=4:1) detection, until the reaction of n-pentene is complete, the material is discharged from the outlet to the reactor for post-processing, and the raw material is continuously added from the feed port; during post-processing, it needs to be added when the temperature is raised to 40 ° C ~ 50 ° C Neutralize with sodium carbonate, then use industrial hydrochloric acid to adjust pH=7, bring to room temperature, add 8...

Embodiment 2

[0025] A method for continuous production of 1,2-pentanediol

[0026] Specific steps are as follows:

[0027] The pipeline reactor is equipped with two feed ports, feed port 1 and feed port 2, and there is a pipe reactor with stirring connected to feed port 1; formic acid (commercially available) 870kg, hydrogen peroxide (50%) 650kg was stirred and mixed evenly, then passed into the pipeline from feed port 1, and 470 kg of n-pentene was fed into feed port 2, heated to 20°C-30°C, kept for 2 hours, and sampled for TLC (developing agent is ethyl acetate: ethanol =4:1) detection, until the reaction of n-pentene is complete, release the material from the outlet to the reactor for post-processing, and continue to add raw materials from the feed port; for post-processing, add carbonic acid when the temperature is raised to 40 ° C ~ 50 ° C Sodium neutralization, then use industrial hydrochloric acid to adjust pH = 7, bring to room temperature, add 800kg ethyl acetate, stir for 30 min...

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Abstract

The invention relates to a preparation method for continuous production of 1,2-pentanediol, main technical points are as follows: using a tubular reactor, using 1-pentene as a raw material and using a peroxide as an oxidant for epoxidation in a system with an organic acid as a solvent, adding an alkali for neutralization to remove the organic acid, after the reaction is completed, adjusting to be neutral, extracting, drying and rectifying to obtain the 1,2-pentanediol with the purity of more than 99.0%. The reaction time is shortened to 2h, the reaction yield is more than 82%, continuous industrial production can be realized, the yield is improved, reaction equipment floor space is small, cost is saved, three-waste emissions can be reduced, postprocessing operation is simple, environmental pollution is less, reaction operation safety is high, and industrialization is facilitated.

Description

technical field [0001] The invention belongs to the field of synthesis and preparation of chemical products, and in particular relates to a preparation method for continuous production of 1,2-pentanediol. Background technique [0002] 1,2-Pentanediol is a colorless transparent liquid, soluble in organic solvents such as alcohol, ether and ethyl acetate. 1,2-Pentanediol is widely used in the world. In addition to being used as the key intermediate of the fungicide propiconazole and cosmetic formulations, it is also an important raw material for the production of polyester fibers, surfactants, pharmaceuticals and other products; 1,2- Pentanediol is a linear diol with distinct polarity and nonpolarity, which makes it have properties different from other diols. This special charge distribution explains its unique characteristics and versatility. It can be mixed with various compounds in various proportions. It is non-corrosive and has insoluble active ingredients. It is used in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/09C07C31/20
CPCC07C29/095C07C67/26C07D301/16C07D303/04C07C31/20C07C69/08
Inventor 巫燕飞
Owner 巫燕飞
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