Environment friendly method for preparing bromopropane

An environmentally friendly, bromopropane technology, applied in the preparation of halogenated hydrocarbons, chemical instruments and methods, organic chemistry, etc., can solve the problems of high production cost, poor recycling, low content, etc., to reduce production safety hazards, The effect of ensuring occupational safety and health and being easy for industrial application

Inactive Publication Date: 2012-11-07
连云港海水化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of the product is generally low, and the solvent is difficult to handle, which is not easy to recycle, which increases the production cost
[0004] To sum up, the existing method and technology will cause certain pollution to the environment due to the backward technology, obsolete equipment and high production cost of the product, and the product yield is low and the content is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In a four-necked flask equipped with a condensation collection device, a stirrer, a thermometer and a constant pressure dropping funnel, add 200 g of 48% (mass concentration, the same below) hydrobromic acid (accounting for about 1 / 5 of the volume of the container), and start Stir the device, and heat up, weigh 685g of 48% hydrobromic acid and 247g of 99% propanol simultaneously, the two are uniformly mixed and placed in the constant pressure dropping funnel. Prepare saturated aqueous sodium carbonate solution. When the temperature in the four-neck flask rises to 108°C, open the constant pressure dropping funnel and drop the mixed solution at a constant speed, raise the temperature to keep the temperature in the flask at 120-125°C, open the condenser to cool down and receive bromopropane. The bromopropane crude product was left to rest for 2 hours, and the layers were separated. The lower oil phase was washed with a saturated aqueous solution of sodium carbonate to a pH...

Embodiment 2

[0029] In a four-necked flask equipped with a condensation collecting device, a stirrer, a thermometer and a constant pressure dropping funnel, add 300 g of 40% hydrobromic acid (accounting for about 1 / 3 of the volume of the container), start the stirring device, and heat up, while Weigh 822g of 40% hydrobromic acid and 257g of 95% propanol to prepare saturated aqueous sodium carbonate solution. When the temperature in the four-neck flask rises to 115°C, hydrobromic acid and propanol solution are added dropwise at the same time (to ensure that HBr and CH 3 CH 2 CH 2 The feed molar ratio of OH is 1:1), the temperature is raised to keep the temperature in the bottle at 125-130°C, and bromopropane is received by condensation. The bromopropane crude product was left to rest for 1.5 hours, separated into layers, and the lower oil phase was washed with a saturated aqueous solution of sodium carbonate to a pH value of 8, and washed twice with water to a pH value of 7, and dried ove...

Embodiment 3

[0031] In a four-necked flask equipped with a condensation collection device, a stirrer, a thermometer and a constant pressure dropping funnel, add 300 g of 49% hydrobromic acid (accounting for about 1 / 3 of the volume of the container), start the stirring device, and heat up. Simultaneously weigh 438g of 60% hydrobromic acid and 197g of 99% propanol and mix uniformly to prepare saturated aqueous sodium carbonate solution. When the temperature in the four-neck flask rises to 120°C, add the mixture of hydrobromic acid and propanol solution dropwise, raise the temperature to keep the temperature in the flask at 130-135°C, and condense to receive bromopropane. The bromopropane crude product was left to rest for 3 hours, and the layers were separated. The lower oil phase was washed with a saturated aqueous sodium carbonate solution and the pH value was 8, and washed twice with water, and the pH value was 7. After drying with molecular sieves, bromopropane was obtained with a yield o...

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PUM

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Abstract

The invention discloses an environment friendly method for preparing bromopropane. The method comprises the steps of: pre-adding hydrobromic acid into a reaction container and preheating till steam is generated; then adding a mixed solution of hydrobromic acid and normal propyl alcohol slowly into the reaction container or respectively adding hydrobromic acid and normal propyl alcohol slowly into the reaction container, wherein temperature in the reaction container is raised to 100-140 DEG C for reaction in the slowly-adding process; and preparing bromopropane. According to the method provided by the invention, use of toxic and harmful raw and auxiliary materials is avoided fundamentally, therefore, the potential safety hazard in production is reduced and the occupational safety and health of workers are ensured. No waste gas is generated and no solid water is discharged in the process. Wastewater can be recycled after neutralization and desalination to realize zero emission of ''three wastes''. Environment friendliness is truly realized and the environment is protected. The method is low in cost, simple to operate and is easy to realize industrialized application.

Description

technical field [0001] The invention belongs to the field of reagent preparation, and in particular relates to an environmentally friendly method for preparing bromopropane. Background technique [0002] Propane bromide, also known as n-propane bromide, n-propyl bromide, propyl bromide, n-propane bromide, is a colorless or light yellow transparent liquid, neutral or slightly acidic, sensitive to light, used in medicine, pesticide intermediates, and new cleaning agents Wait. [0003] According to the current literature reports, most domestic manufacturers adopt the bromine vulcanization method or hydrobromic acid concentrated sulfuric acid catalytic method. Due to the backward technology and outdated equipment, the production cost of the product is high, the content is low, and the performance is unstable. , and cause some pollution to the environment. Bromine vulcanization method: bromine is vulcanized first, and the vulcanized bromine reacts with propanol. Bromine, the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/075C07C17/16
Inventor 章庚柱李备战吉玲
Owner 连云港海水化工有限公司
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