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Environmental-friendly method for preparing bromoethane

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

Active Publication Date: 2012-11-07
LIHAI CHEM IND CO LTD OF JIANGSU JINQIAO SALT & CHEM GRP
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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 48% (mass concentration, the same below) of hydrobromic acid 200g (about 1 / 5 of the container volume), start Stir the device and increase the temperature. At the same time, weigh 774g of 48% hydrobromic acid and 214g of 99% ethanol, mix them evenly and place them in a constant pressure dropping funnel. Prepare saturated sodium carbonate aqueous solution. When the temperature in the four-neck flask rises to 108°C, open the constant pressure dropping funnel to add the mixed solution at a constant speed, increase the temperature to keep the temperature in the bottle at 120-125°C, open the condenser tube to cool the water and receive bromoethane. The crude bromoethane was allowed to stand for 2 hours, and the layers were separated. The lower oil phase was washed with saturated sodium carbonate aqueous solution with a pH value of 8, and ...

Embodiment 2

[0029] In a four-necked flask equipped with a condensate collection device, a stirrer, a thermometer and a constant pressure dropping funnel, add 300 g of 40% hydrobromic acid (about 1 / 3 of the volume of the container), start the stirring device, and increase the temperature. Weigh 928g of 40% hydrobromic acid and 223g of 95% ethanol to prepare a saturated aqueous sodium carbonate solution. When the temperature in the four-neck flask rises to 115°C, add hydrobromic acid and ethanol solution dropwise at the same time (ensure HBr and CH 3 CH 2 The feed molar ratio of OH is 1:1), increase the temperature to maintain the temperature in the bottle at 125-130°C, and condense and receive bromoethane. The crude bromoethane was allowed to stand for 1.5 hours, layered, the lower oil phase was taken out and washed with saturated sodium carbonate aqueous solution with a pH value of 8, washed twice with water and a pH value of 7, and dried over molecular sieve to obtain bromoethane with a yi...

Embodiment 3

[0031] In a four-necked flask equipped with a condensate collection device, a stirrer, a thermometer and a constant pressure dropping funnel, add 300g of 49% hydrobromic acid (about 1 / 3 of the volume of the container), start the stirring device, and increase the temperature. Weigh 495 g of 60% hydrobromic acid and 171 g of 99% ethanol and mix them evenly to prepare a saturated aqueous sodium carbonate solution. When the temperature in the four-neck flask rises to 120°C, the mixture of hydrobromic acid and ethanol solution is added dropwise, and the temperature in the flask is raised to keep the temperature at 130-135°C, and bromoethane is condensed to receive it. The crude bromoethane was allowed to stand for 3 hours to separate into layers. The lower oil phase was taken out and washed with saturated sodium carbonate aqueous solution with a pH value of 8, and washed twice with water with a pH value of 7, and dried over molecular sieve to obtain bromoethane. The yield was 93%, t...

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PUM

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Abstract

The invention discloses an environmental-friendly method for preparing bromoethane. The method comprises the steps as follows: adding hydrobromic acid in a reaction vessel in advance, and then preheating until steam is generated; and slowly adding the mixture of the hydrobromic acid and ethanol into the reaction vessel or slowly adding both in a separated way at the same time, as for the former way, during the adding process, heating the reaction vessel to 100-140 DEG C to cause reaction so as to prepare bromoethane. According to the invention, poisonous and harmful raw materials are reduced from the source, which reduces potential safety hazards during production and ensures the occupational safety and health of staff. During the process, no waste gas is generated, no solid waste is discharged, and waste water can be recycled after being subjected to neutralization and desalting processing, as a result, zero discharge of 'the three wastes' is realized, and the purpose of environment protection is achieved. Therefore, the method has the advantages of low cost, simplicity in operation, and easiness in industrialization application.

Description

Technical field [0001] The invention belongs to the field of reagent preparation, and specifically relates to an environment-friendly method for preparing bromoethane. Background technique [0002] Bromoethane, also known as ethyl bromide, monobromoethane, and bromoethane, is a colorless and transparent liquid with an odor similar to ether. It is used in organic synthesis, synthetic medicine, and as a refrigerant. It is a variety of fine chemical products. The main raw materials, such as medicines, pesticides, fungicides, insecticides, etc., are important industrial solvents. [0003] At present, most domestic manufacturers adopt the process route of bromine vulcanization method or hydrobromic acid concentrated sulfuric acid catalysis method. Due to the backward process and outdated equipment, the product production cost is high, the content is low, the performance is unstable, and it causes certain environmental problems. Pollution. Bromine sulfurization method: The bromine is s...

Claims

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Application Information

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IPC IPC(8): C07C19/075C07C17/16
Inventor 章庚柱李备战吉玲
Owner LIHAI CHEM IND CO LTD OF JIANGSU JINQIAO SALT & CHEM GRP
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