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Salting extractant and separating method for extracting and rectifying m-methylethylbenzene and p-methylethylbenzene from C9 mixture

A p-toluene, extraction and rectification technology, applied in the direction of distillation purification/separation, organic chemistry, etc.

Active Publication Date: 2016-04-06
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] In order to solve the existing C 9 The technical problem of the separation of the middle and p-methylethylbenzene of the aromatic hydrocarbon mixture, and the development of a method from C 9 It is necessary to add salt extractant and extractive distillation method to separate m- and p-methylethylbenzene in aromatic hydrocarbon mixture

Method used

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  • Salting extractant and separating method for extracting and rectifying m-methylethylbenzene and p-methylethylbenzene from C9 mixture
  • Salting extractant and separating method for extracting and rectifying m-methylethylbenzene and p-methylethylbenzene from C9 mixture
  • Salting extractant and separating method for extracting and rectifying m-methylethylbenzene and p-methylethylbenzene from C9 mixture

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Experimental program
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Effect test

Embodiment 1

[0026] refer to figure 1 The flow shown, from C 9 Separation of m- and p-methylethylbenzene from aromatic hydrocarbon mixture. with C 9 Total mass of aromatic mixture, C 9 Aromatic mixture, C 9 The mass percentage of the former component is 1.06%, the total mass percentage of m-methylethylbenzene and p-methylethylbenzene is 82.80%, and the total mass percentage of mesitylene and o-methylethylbenzene is 1.57%. The salt-added extractant is selected from 99 parts by mass of methyl salicylate and 1 part by mass of potassium thiocyanate. The total mass of salted extractant and C 9 The ratio of the total mass of the aromatic mixture is 0.5. The number of theoretical plates of the heavy component removal tower is 20, and the reflux ratio based on mass is 1; the number of theoretical plates of the extractive distillation column is 60, and the reflux ratio based on mass is 2; The calculated reflux ratio is 1; the top pressure of each tower is 0.1MPa. The yield of the obtained p...

Embodiment 2

[0028] refer to figure 1 The flow shown, from C 9 Separation of m- and p-methylethylbenzene from aromatic hydrocarbon mixture. with C 9 Total mass of aromatic mixture, C 9 Aromatic mixture, C9 The mass percentage of the former component is 1.06%, the total mass percentage of m-methylethylbenzene and p-methylethylbenzene is 82.80%, and the total mass percentage of mesitylene and o-methylethylbenzene is 1.57%. The salt-added extractant is selected from 90 parts by mass of methyl salicylate and 10 parts by mass of potassium thiocyanate. The total mass of salted extractant and C 9 The ratio of the total mass of the aromatic mixture is 0.5. The number of theoretical plates of the heavy component removal tower is 20, and the reflux ratio based on mass is 1; the number of theoretical plates of the extractive distillation column is 60, and the reflux ratio based on mass is 2; The calculated reflux ratio is 1; the top pressure of each tower is 0.1MPa. The yield of the obtained p...

Embodiment 3

[0030] refer to figure 1 The flow shown, from C 9 Separation of m- and p-methylethylbenzene from aromatic hydrocarbon mixture. with C 9 Total mass of aromatic mixture, C 9 Aromatic mixture, C 9 The mass percentage of the former component is 1.06%, the total mass percentage of m-methylethylbenzene and p-methylethylbenzene is 82.80%, and the total mass percentage of mesitylene and o-methylethylbenzene is 1.57%. The salt-added extractant is selected from 95 parts by mass of methyl salicylate, 3 parts by mass of potassium thiocyanate and 2 parts by mass of sodium thiocyanate. The total mass of salted extractant and C 9 The ratio of the total mass of the aromatic mixture is 0.5. The number of theoretical plates of the heavy component removal tower is 20, and the reflux ratio based on mass is 1; the number of theoretical plates of the extractive distillation column is 60, and the reflux ratio based on mass is 2; The calculated reflux ratio is 1; the top pressure of each tower...

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Abstract

The invention relates to a salting extractant and a separating method for extracting and rectifying m-methylethylbenzene and p-methylethylbenzene from a C9 mixture to mainly solve the technical problem of difficult separation of m-methylethylbenzene and p-methylethylbenzene in a C9 aromatic hydrocarbon mixture. Salicylate is adopted as an extractant in the sating extractant, thiocyanate is adopted as a salt in the salting extractant, the C9 aromatic hydrocarbon mixture is introduced to a heavy component removal tower with the top provided with an effusion tank and undergoes batch rectification, unstrimethylbenzene and hemimellitene are extracted from the bottom of the removal tower, a tower top flow stream is introduced to an extraction rectifier and is extracted and rectified, m-methylethylbenzene and p-methylethylbenzene are extracted from the top of the extraction rectifier, a rectifier bottom flow stream enters a solvent recovery tower, o-methylethylbenzene and mesitylene are obtained at the top of the solvent recovery tower, and the salting extractant obtained at the bottom of the solvent recovery tower can be recycled. The salting extractant and the separating method well solve the problem and can be used in the field of C9 aromatic hydrocarbon mixture separation.

Description

technical field [0001] The invention belongs to the chemical industry separation field, specifically, relates to a 9 Salt-added extractant and separation method for extraction and rectification of aromatic hydrocarbon mixtures and p-toluene. Background technique [0002] The dehydrogenation products of m- and p-methylethylbenzene are widely used. At the same time, m- and p-methylethylbenzene are also excellent raw materials for the synthesis of chloromethylstyrene and the oxidation of toluic acid. However, C 9 The boiling points of the components in the aromatic hydrocarbon mixture are very close, and it is difficult to achieve C by conventional methods. 9 Separation of m- and p-methylethylbenzene from aromatic hydrocarbon mixture. [0003] At present, the methods of precision distillation and accelerated distillation are mainly used to obtain 9 Separation of m- and p-methylethylbenzene from aromatic hydrocarbon mixture. [0004] Document CN200810225604.0 discloses a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/08C07C15/02
Inventor 顾军民田立达韩诚康
Owner CHINA PETROLEUM & CHEM CORP
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