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Method for producing allyl bromide

A technology for allyl bromide and allyl bromide crude products, which is applied in the field of producing allyl bromide by using allyl alcohol, which can solve the problems of easy corrosion of equipment and low product yield, and achieve light equipment corrosion and low production cost Effect

Active Publication Date: 2013-04-03
山东鲁源化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Allyl bromide is mainly used in organic synthesis. There are two main production methods for the synthesis of allyl bromide, one is propylene bromination, and the other is the reaction of allyl alcohol with hydrobromic acid. Since allyl bromide is in the production Easy to polymerize and other reasons in the process, so it is easy to cause low product yield, and the equipment is easy to corrode during the reaction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Adding 100 parts by weight of 98% sulfuric acid, 100 parts by weight of propylene alcohol, and 1 part by weight of ferrous bromide to 400 parts by weight of hydrobromic acid with a mass concentration of 48% under stirring, at 40 ° C Insulated reaction for 1.5 hours, then standing for stratification, extracting the organic layer, then washing the extracted organic layer liquid with water, then standing for stratification, extracting the organic layer to obtain the crude product of allyl bromide, which was subjected to fine Distillation, packaging to get allyl bromide finished product.

[0014] The synthesis yield of allyl bromide can reach 97.9%.

Embodiment 2

[0016] Adding 50 parts by weight of mass concentration to 300 parts by weight of 55% hydrobromic acid under stirring is 99% sulfuric acid, 80 parts by weight of propylene alcohol, and 0.5 parts by weight of ferrous chloride, and is incubated at 20 ° C. Reacted for 0.5 hours, then allowed to stand for stratification, and extracted the organic layer, then washed the extracted organic layer liquid with 8% sodium carbonate solution with a mass concentration, then stood for stratification, extracted the organic layer, and obtained the crude product of allyl bromide, The crude product of allyl bromide is rectified and packaged to obtain the finished product of allyl bromide.

[0017] The synthesis yield of allyl bromide can reach 98%.

Embodiment 3

[0019] Adding 150 parts by weight of 95% sulfuric acid, 120 parts by weight of propylene alcohol, and 5 parts by weight of cuprous chloride to 500 parts by weight of 40% hydrobromic acid in a stirred state was incubated at 50°C. Reaction for 2 hours, then standing for layering, extracting the organic layer, then washing the extracted organic layer liquid with 10% sodium bicarbonate solution with a mass concentration, then standing for layering, extracting the organic layer, adding to the extracted organic layer liquid Add 10 parts by weight of anhydrous sodium sulfate desiccant, and obtain the crude product of allyl bromide by filtration, rectify and package the crude product of allyl bromide to obtain the finished product of allyl bromide.

[0020] The synthesis yield of allyl bromide can reach 98.5%.

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Abstract

The invention discloses a method for producing allyl bromide, which comprises the following steps of: adding and stirring 50-150 portions by weight of 95-99% sulfuric acid, 80-150 portions by weight of propenol and 0.5-5 portions by weight of catalyst into 300-500 portions by weight of 40-55% hydrobromic acid; making the materials react at the constant temperature of 20-50 DEG C for 0.5-2 hours, standing until the products of reaction delaminates and extracting the organic layer; and adding water and 1-10% sodium carbonate solution or 1-10% sodium bicarbonate solution into the extracted organic layer liquid to wash, standing until the solution delaminate, extracting the organic layer to obtain a crude allyl bromide product, and carrying out after-treatment on the crude allyl bromide product to obtain the finished allyl bromide product. The method has the advantages of low production cost, high safety and low corrosiveness on equipment in the reaction process, and the yield for synthesizing the allyl bromide by using the method can reach 97%.

Description

technical field [0001] The invention relates to a production method of a chemical substance, in particular to a method for producing allyl bromide by using allyl alcohol. Background technique [0002] Allyl bromide is mainly used in organic synthesis. There are two main production methods for the synthesis of allyl bromide, one is propylene bromination, and the other is the reaction of allyl alcohol with hydrobromic acid. Since allyl bromide is in the production Easy to polymerize and other reasons in the process, so it is easy to cause the product yield to be on the low side, and the equipment is easy to corrode in the reaction process. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for producing allyl bromide with low production cost, high product yield and light corrosion to equipment. [0004] In order to solve the above-mentioned technical problems, the technical solution of the present invention ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C21/14C07C17/16
Inventor 冯仲善
Owner 山东鲁源化工科技有限公司