Method for preparing mixed methylnaphthalene by using C+10 heavy aromatic hydrocarbon as raw material

A technology for mixing methyl naphthalene and heavy aromatic hydrocarbons, applied in the preparation of β-methyl naphthalene, α field, can solve the problems of complex process, environmental pollution, equipment corrosion, etc., and achieves a process with few process steps, easy source of raw materials and low cost. Effect

Active Publication Date: 2008-08-27
常熟华虞环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the coal tar fraction of complex components contains α, β-methylnaphthalene, the commonly used methods all have problems such as complex process, high energy consumption, equipment corrosion, environmental pollution, etc., so α, β-methylnaphthalene is Mixed methyl naphthalene is basically imported from abroad

Method used

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  • Method for preparing mixed methylnaphthalene by using C+10 heavy aromatic hydrocarbon as raw material
  • Method for preparing mixed methylnaphthalene by using C+10 heavy aromatic hydrocarbon as raw material
  • Method for preparing mixed methylnaphthalene by using C+10 heavy aromatic hydrocarbon as raw material

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Experimental program
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Effect test

Embodiment 1

[0026] Please refer to the accompanying drawing. The methylnaphthalene content of 35.3% carbon deca aromatics raw material purchased from Nanjing Jiuyuan Petrochemical Co., Ltd., 26A5, Shangmao Century Plaza, No. 49, Zhongshan South Road, Nanjing City, Jiangsu Province, China, was placed at room temperature The pipeline 1 is introduced into the first rectification tower 2 from the middle and lower feed port of the first rectification tower 2 with a diameter of 1.2m, a tower height of 35m, and 112 trays for rectification. The reflux ratio is controlled as 1:10, the absolute pressure at the top of the tower is controlled at 10KPa, the temperature at the top of the tower is controlled at 112°C, the light fraction at the top of the first rectification tower 2 is cooled by the first tower top heat exchanger 3, and the liquid enters the first rectification tower 2 In the first overhead reflux tank 4 of the first rectification column, the uncondensed part enters the first overhead con...

Embodiment 2

[0028] Only change the content of methylnaphthalene in the C10 heavy aromatics raw material to 36.1%, the first rectifying tower 2 control: the reflux ratio is changed to 1:8, the absolute pressure at the top of the tower is changed to 15Kpa, the temperature at the top of the tower is changed to 120°C, The heating temperature of the heat transfer oil at the bottom of the tower is 295°C; the control of the second rectification tower 10: the reflux ratio is changed to 1:6, the absolute pressure at the top of the tower is changed to 20Kpa, the temperature at the top of the tower is changed to 156°C, and the heating temperature of the heat transfer oil at the bottom of the tower is changed to 292°C. All the other are with embodiment 1.

Embodiment 3

[0030] Only change the content of methylnaphthalene in the C10 heavy aromatics raw material to 37.5%, and the first rectifying tower 2 controls: the reflux ratio is changed to 1: 10, the absolute pressure at the top of the tower is changed to 13Kpa, the temperature at the top of the tower is changed to 119°C, The heating temperature of the heat transfer oil at the bottom of the tower is 280°C; the control of the second rectification tower 10: the reflux ratio is changed to 1:9, the absolute pressure at the top of the tower is changed to 22Kpa, the temperature at the top of the tower is changed to 160°C, and the heating temperature of the heat transfer oil at the bottom of the tower is changed to 281°C. All the other are with embodiment 1.

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Abstract

A method for preparing mixed methylnaphthalene from C10 heavy Aromatic Hydrocarbon material belongs to the preparation technical field of alpha and beta-methylnaphthalene, which comprises leading C10 heavy Aromatic Hydrocarbon material from the inlet of a first distillation column into the first distillation column at normal temperature to be distilled, controlling the top temperature, pressure, reflux ratio and bottom heating temperature of the first distillation column, exchanging the heat and condensing the light fraction at the top of the first distillation column, feeding the condensate into a first column top reflux tank, leading out the top distillate of the first distillation column as solvent, leading out liquid naphthalene at the side pipeline of the first distillation column, leading the heavy fraction at the bottom of the first distillation column into a second distillation column to be distilled further, controlling the top temperature, pressure and reflux ratio and bottom heating temperature of the second distillation column, exchanging the heat and condensing the light fraction of the second distillation column, feeding the condensate into a seond column top reflux tank to obtain the final product of mixed methylnaphthalene, and leading out the heavy fraction at the bottom of the second distillation column from the bottom of the second distillation column. The invention has simple process, simple operation, low cost and non generation of three wastes in whole preparation.

Description

technical field [0001] The invention belongs to the technical field of preparation of α and β-methylnaphthalene, and in particular relates to a method for preparing mixed methylnaphthalene from carbon deca-heavy aromatic hydrocarbon raw materials. Background technique [0002] Mixed methylnaphthalene is mainly a mixture of α-methylnaphthalene and β-methylnaphthalene, that is, a mixture of 1-methylnaphthalene and 2-methylnaphthalene. 1-methylnaphthalene is also called α-methylnaphthalene, and 2-methylnaphthalene is also called β-methylnaphthalene, because methylnaphthalene is a one-way substitute for naphthalene, and the name of the one-way substitute for naphthalene is based on The name is based on the parent nucleus of naphthalene, as follows: [0003] The molecular structure of naphthalene is: [0004] [0005] Generally, the structural formula of naphthalene is written in the form of (1). Among them, the four carbon atoms 1, 4, 5, and 8 are adjacent to the common ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/04C07C13/48
Inventor 陈绮峰苏仁球李凤娟陈丽萍刘忠云
Owner 常熟华虞环境科技有限公司
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