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Method for removing micro-benzene in solvent oil or hexane refining process

A technology of solvent oil and hexane, which is applied in the field of extraction, rectification and separation of trace benzene, and removal of trace benzene, which can solve the problems of large loss of raw materials and increase of sulfur content in products, and achieve low investment, good effect and small reflux ratio Effect

Inactive Publication Date: 2008-08-06
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can remove 1% of benzene to about 0.01% (100ppm), but has the disadvantages of large loss of raw materials and increased sulfur content of products
Someone once proposed the method of using molecular sieve adsorption method, but no published articles and patents have been reported in detail

Method used

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  • Method for removing micro-benzene in solvent oil or hexane refining process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The raw material composition of solvent oil in a chemical plant is as follows

[0023] components

[0024] n-Hexane

[0025] It is required to cut out the food-grade distillate at 62-70°C, the benzene content is less than 50ppm, and the processing capacity of the raw material (stream 1) is 1000kg / h.

[0026] Furfural in the composite extractant (stream 2): ethylene glycol=0.3:0.7; the proportioning ratio of the raw material to the composite extractant is 1:1.2.

[0027] The top of the extraction and distillation tower is at normal pressure, the temperature at the top of the tower is 61.7-70°C, the temperature at the bottom of the tower is 135-140°C, the number of theoretical plates is 68, and the reflux ratio at the top of the tower is 3.5-4; CY700 wire mesh packing is used with a length of 16m, divided into 5 sections , and the top to bottom heights are 3 / 3.5 / 3.5 / 3 / 3m respectively, the position of the raw material entering the tower is above the fou...

Embodiment 2

[0033] The composition of industrial hexane in a factory is as follows

[0034] components

[0035] It is required to cut out 97.5% hexane product, benzene content <50ppm, and raw material (stream 1) processing capacity to be 500kg / h.

[0036] Furfural in the composite extractant (stream 2): ethylene glycol=0.8:0.2; the proportioning ratio of the raw material to the composite extractant is 1:0.6.

[0037] The top of the extractive distillation tower is at normal pressure, the temperature at the top of the tower is 68.7-70°C, the temperature at the bottom of the tower is 140-145°C, the number of theoretical plates is 78, and the reflux ratio at the top of the tower is 3.8; CY700 wire mesh packing is used for 18m, divided into 5 sections, and the top The downward heights are 4 / 3.5 / 3.5 / 3.5 / 3.5m respectively, the raw material enters the column above the packing of the fourth section (about 48 theoretical plates), and the compound extraction agent enters the column above ...

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Abstract

A method for removing trace benzene in refinement of solvent oil or hexane principally comprises adding a composite extractant, which consists of furfurol and ethanediol, and raw material, i.e. solvent oil or industrial hexane, in a certain proportion, into an extraction and rectification tower by different positions. Then solvent oil distillate or industrial hexane product with lower than 50ppm benzene content is obtained at the tower top, while a mixture of heavy components in the raw material and the composite extractant is left in the tower kettle. The mixture returns into an extractant recovery tower for separation. Afterwards, heavy components in the raw material are distilled out from the tower top and the composite remains in the tower kettle for reuse. The method has the advantages of high benzene-removal efficiency, low cost, low energy consumption, strong application reliability, etc.

Description

technical field [0001] The invention belongs to the field of chemical separation, and relates to a new method for removing trace amounts of benzene in the process of separating and cutting distillate products with hexane as the main component from solvent oil. In particular, the invention relates to an extraction, rectification and separation method for removing a small amount of benzene in a hexane fraction product by using a composite solvent. Background technique [0002] N-hexane and solvent oil products with n-hexane as the main component are important petroleum processing products, which can be used as solvents or basic raw materials for the production of pharmaceutical intermediates, and are widely used in chemical production. At present, related products on the market can be roughly divided into three grades: solvent oil products with a hexane content of about 80% and a distillation range of 65-70°C; hexane products with a content of 95%; Refined hexane with a conte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C9/15C07C7/08
Inventor 耿皎张志炳吴有庭朱扬
Owner NANJING UNIV
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