An environmentally friendly method for preparing ethyl bromide

An environmentally friendly, ethyl bromide technology, which is applied in the preparation of halogenated hydrocarbons, chemical instruments and methods, organic chemistry, etc., can solve the problems of poor recycling, high production costs, and low content, so as to ensure occupational safety and health , reduce production safety hazards, and be easy for industrial application

Active Publication Date: 2015-12-09
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 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 48% hydrobromic acid 774g and 99% ethanol 214g 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 to add the mixed solution dropwise 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 ethyl bromide. The bromoethane crude product was left to stand for 2 hours, and the layers were separated, and the oil phase of the lower layer was washed with a saturated aqueous sodium carbonate s...

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 928g of 40% hydrobromic acid and 223g of 95% ethanol to prepare saturated aqueous sodium carbonate solution. When the temperature in the four-neck flask rises to 115°C, hydrobromic acid and ethanol solution are added dropwise at the same time (to ensure that HBr and CH 3 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 bromoethane is received by condensation. The bromoethane crude product was left to stand for 1.5 hours, and the layers were separated, and the oil phase of the lower layer was washed with a saturated aqueous solution of sodium carbonate to have a pH value of 8, washed twice with water, and the pH value wa...

Embodiment 3

[0031] 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 49% hydrobromic acid (accounting for about 1 / 3 of the volume of the container), start the stirring device, and heat up, while Weigh 495g of 60% hydrobromic acid and 171g of 99% ethanol and mix them 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 ethanol solution dropwise, raise the temperature to keep the temperature in the flask at 130-135°C, and condense to receive ethyl bromide. The bromoethane crude product was left to stand for 3 hours, and the layers were separated, and the oil phase of the lower layer was washed with a saturated aqueous solution of sodium carbonate to have a pH value of 8, washed twice with water, and the pH value was 7, and dried through molecular sieves to obtain bromoethane with a ...

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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 in particular relates to an environmentally friendly method for preparing ethyl bromide. Background technique [0002] Bromoethane, also known as ethyl bromide, monobromoethane, or bromoethane, is a colorless transparent liquid with an ether-like odor. It is used in organic synthesis, synthetic medicine, and as a refrigerant. It is a variety of fine chemical products. The main raw materials of pharmaceuticals, pesticides, fungicides, insecticides, etc., are important industrial solvents. [0003] At present, 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, the performance is unstable, and it causes certain damage to the environment. pollute. Bromine vulcanization method: The bromine is vulc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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