Method for preparing petroleum naphthalene by using C+10 heavy aromatic hydrocarbon as raw material

A technology for heavy aromatics and petroleum naphthalene, applied in the direction of isomerization hydrocarbon production, organic chemistry, etc., can solve the problems of serious environmental pollution, long process flow, high cost, etc., and achieve the effect of easy source of raw materials, few process steps, and simple operation

Active Publication Date: 2008-08-27
常熟华虞环境科技有限公司
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AI Technical Summary

Problems solved by technology

[0012] Because the raw material used in the above method is coal tar, in view of the fact that the composition of coal tar is quite complex and requires high-temperature treatment to cause more naphthalene impurities and yellow color, it also needs sulfuric acid washing or hydrofining to purify. The process is long and expensive

Method used

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  • Method for preparing petroleum naphthalene by using C+10 heavy aromatic hydrocarbon as raw material
  • Method for preparing petroleum naphthalene by using C+10 heavy aromatic hydrocarbon as raw material
  • Method for preparing petroleum naphthalene by using C+10 heavy aromatic hydrocarbon as raw material

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Embodiment 1

[0028] Please see attached figure 1 , will be purchased from China Petrochemical Group Yangzi Petrochemical Co., Ltd. in Liuhe District, Nanjing City, Jiangsu Province, China, with a naphthalene content of 3% carbon deca-heavy aromatics feedstock, at room temperature from the pipeline 1 lead through the diameter of 1.6m, tower The first tower top heat exchanger 3 of the first rectifying tower 2 with a height of 35m and 138 trays comes from the top of the first rectifying tower 2 and enters the first tower top heat exchanger 3 The light fraction distillate is heat exchanged, and after heat exchange, the C10 heavy aromatics raw material with a temperature of 68°C is introduced into the first rectification tower 2 from the middle and lower part of the tower body of the first rectification tower 2. rectification. The rectification conditions are controlled as follows: the temperature at the top of the first tower is 130°C, and the absolute pressure at the top of the tower is 19KP...

Embodiment 2

[0030] Only change the content of naphthalene in the carbon ten heavy aromatic hydrocarbon feedstock into 7%, and the 1000% distilled from the top of the first rectifying tower 2 # The temperature of the solvent is changed to 71° C., the temperature of the C10-heavy aromatics raw material after heat exchange is changed to 52° C., and the control conditions of the first rectifying tower 2: the tower top temperature is changed to 112° C., and the reflux ratio is changed to 1: 10. The absolute pressure at the top of the tower is changed to 15KPa, the heating temperature of the heat transfer oil at the bottom of the tower is changed to 280°C; the control conditions of the second rectification tower 10: the temperature at the top of the tower is changed to 130°C, the control reflux ratio is changed to 1:9, and the heat transfer oil at the top of the tower is changed to 1:9. Change the pressure to 15Kpa, change the temperature of the naphthalene-enriched liquid drawn from the second ...

Embodiment 3

[0032] Only change the content of naphthalene in the carbon ten heavy aromatics raw material into 5.9%, and the 1000% of the overhead distillate of the first rectifying tower 2 # The temperature of the solvent is changed to 76°C, the temperature of the carbon ten heavy aromatics raw material after heat exchange is changed to 61°C, and the first rectifying tower 2 control conditions: the tower top temperature is changed to 121°C, and the reflux ratio is changed to 1: 12. The absolute pressure at the top of the tower is changed to 17KPa, and the heating temperature of the heat transfer oil at the bottom of the tower is changed to 272°C; the control conditions of the second rectification tower 10: the temperature at the top of the tower is changed to 126°C, the control reflux ratio is changed to 1:10, and the heat transfer oil at the top of the tower is changed to 1:10. Change the pressure to 13KPa, change the temperature of the naphthalene-enriched liquid drawn from the side line...

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Abstract

A method for preparing petroleum naphthalene from C10 heavy Aromatic Hydrocarbon material belongs to the preparation technical field of petroleum naphthalene, which comprises exchanging the heat of C10 heavy Aromatic Hydrocarbon material with low naphthalene with the light fraction distillate at the top of a first distillation column, leading the material into the distillation column to be distilled, exchanging the heat and condensing the light fraction at column top, feeding condensate into a reflux tank at column top, leading the top distillate as a first solvent via a pipeline, leading out rich durene solution from the first side pipeline of the first distillation column, separating out the light fraction distillate and the rich durene solution, leading the heavy fraction distillate at the column bottom into a second distillation column to be distilled, leading out the top distillate of the second distillation column as a second solvent via a pipeline, separating out the light and heavy fraction distillates in the second distillation column, leading out rich naphthalene solution from a second side pipeline of the second distillation column, cooling, crystallizing the rich naphthalene solution via a crystallization device, and separating crystallization mother liquor via a centrifugal separator, to obtain final product of petroleum naphthalene. The invention has few process, simple operation and low cost, while the whole preparation has no generation of three wastes.

Description

technical field [0001] The invention belongs to the technical field of preparation of petroleum naphthalene, and in particular relates to a method for preparing petroleum naphthalene from C10-heavy aromatic hydrocarbon raw materials. Background technique [0002] Industrial naphthalene is a fine chemical product with a wide range of uses, which is of great significance to industries such as textiles, printing and dyeing, and papermaking. [0003] Naphthalene molecular formula C 10 h 8 , with a molecular weight of 128, is the simplest fused-ring aromatic compound with two adjacent aromatic rings. It was first discovered in 1820 by Carden in fractions of coal tar. The structural formula of naphthalene is usually written as: [0004] [0005] Positions 1, 4, 5, and 8 are called alpha positions, and positions 2, 3, 6, and 7 are called beta positions. [0006] Naphthalene is a solid at room temperature and is easily sublimated into colorless flakes or monoclinic crystals....

Claims

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Application Information

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IPC IPC(8): C07C15/24C07C5/22
Inventor 苏仁球苏惠忠陈绮峰李凤娟刘忠云
Owner 常熟华虞环境科技有限公司
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