Method for recovering chlorobenzene
A recovery method and technology of chlorobenzene, which is applied in the field of recovery of chlorobenzene, can solve the problems that the quality of distilled chlorobenzene cannot be found in time, the liquid level control requires high precision, and the labor intensity is high, so as to reduce the labor intensity of workers and simplify the structure , high recycling efficiency
Inactive Publication Date: 2013-01-02
天津长芦汉沽盐场有限责任公司
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Problems solved by technology
In the two-stage phase separator, the mixture of chlorobenzene and water needs to stay still for about 2 hours, and the valve at the bottom of the phase separator needs to be manually controlled with a sight glass and a light for the sight glass to perform liquid separation operation, and the chlorobenzene and water are discharged regularly. frequent operation
Workers operate no less than 12 times on the two-stage phase separator every day, and the liquid level control requires high precision. Since the effect of distillation and condensation cannot be observed directly, the quality of distilled chlorobenzene cannot be detected in time, and then Cause a certain waste of raw materials and energy
Therefore, the existing chlorobenzene recovery method has the disadvantages of complex operation, high equipment investment, high labor intensity and low recovery efficiency.
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[0016] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples, and detailed descriptions are as follows with accompanying drawings:
[0017] A method for recovering chlorobenzene is a method of recovering chlorobenzene from a mixture of chlorobenzene and water according to the steps of distillation, condensation and separation. The specific implementation of the method is:
[0018] 1. Using the characteristic of azeotrope of chlorobenzene and water, the chlorobenzene and water in the waste solvent are distilled out by means of atmospheric batch distillation;
[0019] 2. The vapor phase components of distilled chlorobenzene and water enter the condenser to cool down, and then enter the chlorobenzene automatic separation bottle through the U-shaped bend;
[0020] 3. Using the principle of immiscibility between chlorobenzene and water and the difference in density and specific gravity, the principle of hy...
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The invention discloses a method for recovering chlorobenzene, which is a method for recovering chlorobenzene in a mixed solution of chlorobenzene and water by sequentially adopting steps of distillation, condensation and separation. It is characterized in that the separation step adopts a chlorobenzene automatic separation bottle for performing operation. The method reduces equipment input and labor intensity of workers, and has intuitive observation effect. The separation of the mixed solution of chlorobenzene and water is thorough; the separated water can be recycled as process water; the separated chlorobenzene has greatly-reduced water content and purity above 99.0%, satisfies production process requirement, and can be utilized directly; and wastewater treatment quantity is reduced, and remarkable energy-saving consumption-reducing effect is achieved.
Description
[0001] Field: [0002] The invention relates to a method for recovering chlorobenzene, in particular to a method for separating chlorobenzene from a mixed liquid of chlorobenzene and water. Background technique: [0003] As an important aromatic hydrocarbon halogen derivative, chlorobenzene is a basic chemical raw material and an organic solvent with a wide range of applications in industry. In many chemical industries, the distillation and recovery of chlorobenzene is a common problem. The more common recovery method is to use the azeotropic characteristics of chlorobenzene and water, and use atmospheric batch distillation to distill and recover the waste solvent chlorobenzene, and then use a condenser Cool down the distilled gas phase components, and then use a cone-shaped two-stage phase separator to perform static layering operation on the condensed chlorobenzene and water mixture. After the static reaches the process requirements, the chlorobenzene returns to the chlorobenzene...
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IPC IPC(8): C07C25/06C07C7/05
Inventor 王春玲
Owner 天津长芦汉沽盐场有限责任公司