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2-bromopropane recycling and reuse process in preparation process of 2,2-Diisopropylpropionitrile

A technology of propylpropionitrile and bromopropane is applied in the technical field of recycling 2-bromopropane, and achieves the effects of high yield, easy handling and reduction of pollutant discharge.

Active Publication Date: 2017-02-01
濮阳天源生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the invention is to provide the recycling process of 2-bromopropane in the process of preparing 2,2-diisopropylpropionitrile, effectively solving the recycling problem of 2-bromopropane

Method used

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  • 2-bromopropane recycling and reuse process in preparation process of 2,2-Diisopropylpropionitrile

Examples

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Embodiment 1

[0015] The recovery and utilization process of 2-bromopropane in the process of preparing 2,2-diisopropylpropionitrile includes the following steps: (1) Add methyl tert-butyl with a weight ratio of (2~10):1 to a three-necked flask base ether and sodium amide, stirred and heated to 50-80°C, and the reflux time was 0.5-5 hours; mixed 2-bromopropane and propionitrile with a weight ratio of (5-10): 1 to obtain a mixed solution A; The mixed solution A is slowly dropped into the three-necked flask, the dropping time is 1-5 hours, and the reaction time is 2-10 hours; after the reaction is completed, the remaining solution B is obtained after the solvent methyl tert-butyl ether is recovered by distillation; the remaining solution is B. Cool down to 20°C, add anhydrous ethanol and purified water with a weight ratio of 1:1 to the three-necked flask successively, and the weight ratio of anhydrous ethanol, purified water, sodium amide and 2-bromopropane is 1:1:1 : (2~7), quench sodium ami...

Embodiment 2

[0018] Add 2.1kg of solvent methyl tert-butyl ether (MTBE) and 0.4kg of sodium amide into the three-necked flask respectively, the weight ratio of methyl tert-butyl ether and sodium amide is 5.25:1, stir and raise the temperature to 58°C, and the reflux time is 2 hours; mix 1.3kg of 2-bromopropane and 0.19kg of propionitrile with a chromatographic content ≥ 99%, and the weight ratio of 2-bromopropane and propionitrile is 6.84:1 to obtain a mixed solution A; slowly drop the mixed solution A Put it into a three-necked flask, drop it for 5 hours, and react for 2 hours; after the reaction is completed, distill and recover the solvent methyl tert-butyl ether (MTBE) to obtain the remaining solution B; cool the remaining solution B to 20°C, and pour it into the three-necked flask Add 0.4kg of absolute ethanol and 0.4kg of pure water dropwise successively, the weight ratio of absolute ethanol, purified water, sodium amide and 2-bromopropane is 1:1:1:3.25, to quench the sodium amide and...

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Abstract

The invention relates to a 2-bromopropane recycling and reuse process in preparation process of 2,2-Diisopropylpropionitrile. The process belongs to the technical field of chemical industry. The process is characterized in that under the catalytic function of concentrated sulphuric acid, the reaction between isopropyl alcohol and sodium bromide is used to achieve the recycling and reusing of bromopropane. The process simplifies the treatment of the waste water generated by the 2,2-Diisopropylpropionitrile preparation. The process also reduces emission, thereby has strong environmental benefits; the 2-bromopropane acquired by this process enjoys a high productive rate and high purity. The production cost can be halved which signifies enormous economical benefits.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and in particular relates to a process for recycling 2-bromopropane in the process of preparing 2,2-diisopropylpropionitrile. Background technique [0002] The production route of 2,2-diisopropylpropionitrile uses sodium amide, propionitrile and 2-bromopropane as raw materials, and methyl tert-butyl ether (MTBE) as solvent to obtain 2,2-diiso Propylpropionitrile, while obtaining by-product sodium bromide. But the by-product sodium bromide (NaBr) puts enormous pressure on sewage treatment. At the same time, the production of 2,2-diisopropylpropionitrile requires the purchase of a large amount of 2-bromopropane, and in the existing production process, 2-bromopropane is not recovered, which is not only unfavorable for enterprises to reduce production costs, but also causes huge environmental pressure. Contents of the invention [0003] The object of the invention is to provide a process for recycl...

Claims

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Application Information

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IPC IPC(8): C07C17/16C07C19/075C07C253/30C07C255/03
CPCC07C17/16C07C253/30C07C19/075C07C255/03
Inventor 李鹏毅吕孝永文教刚马红磊孟宪乐
Owner 濮阳天源生物科技有限公司
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