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Method for removing unsaturated hydrocarbon and thiophene from coking benzene

A technology for coking benzene and unsaturated, applied in the direction of organic chemistry, chemical change purification/separation, etc., can solve problems such as thiophene desulfurization, and achieve the effect of easy implementation, simple and easy reaction and separation methods

Inactive Publication Date: 2010-04-07
TAIYUAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the content of thiophene in coking benzene is relatively high, and H 2 o 2 It is difficult to desulfurize thiophene in coking benzene by catalytic oxidation method as an oxidant

Method used

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  • Method for removing unsaturated hydrocarbon and thiophene from coking benzene
  • Method for removing unsaturated hydrocarbon and thiophene from coking benzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of coking refined benzene after extraction and refining, the benzene content is more than 99.5%, the appearance is colorless, transparent liquid, the colorimetry of acid washing, bromine value and total sulfur content all do not meet the national standard GB / T 2283 "Coking benzene" The quality standard of medium and high-quality products. According to GB / T 8035 "Determination Method for Pickling Colorimetry of Coking Benzene Products", the colorimetry of the pickled refined benzene is determined to be greater than 2g / l; according to GB / T 1815 "Determination of Bromine Value of Benzene Products", the determination of coking The bromine value of refined benzene is 0.07g / 100ml; according to GB / T 3208 "Microcoulombic Determination of Total Sulfur in Benzene Products", the total sulfur content of coking refined benzene is 65.3mg / kg; according to GB / T 14327 "The content of thiophene in benzene Determination method ", the content of thiophene in coking refined benzene w...

Embodiment 2

[0031] The sample and basic treatment steps are the same as in Example 1. Take 100 ml of coking refined benzene and mix with 20 ml of 0.063 mol / l potassium permanganate aqueous solution, add 1 ml of glacial acetic acid, adjust the pH value of the mixed solution to about 3, and stir at room temperature for 1 Hours, after standing for stratification, take out the benzene in the upper layer, wash with aqueous solution, the quality indicators of the coking refined benzene obtained are as follows: pickling colorimetry 0.3g / l, bromine value 0.028g / 100ml, total sulfur 52.0mg / kg, total sulfur Thiophene in 49.6mg / kg.

[0032] Coking refined benzene is mixed with 0.063mol / l potassium permanganate aqueous solution, the mixing volume ratio is 1:0.2, and stirred once under weak acidic conditions at room temperature, the unsaturated hydrocarbons in coking refined benzene can be removed, and the colorimetric effect of pickling can be reduced. and bromine price indicators.

Embodiment 3

[0034] The sample and basic processing steps are the same as in Example 1. Take 40ml of coking refined benzene and mix with 100ml of 0.403mol / l potassium permanganate aqueous solution. After mixing, the pH value of the solution is about 7. Stir at 50°C for 1 hour, and let it stand for stratification Finally, the benzene in the upper layer is taken out, washed with 30% NaOH solution, and the quality indicators of the coked refined benzene obtained are as follows: acid wash colorimetric 0.2g / l, bromine value 0.042g / 100ml, total sulfur 47.9mg / kg, thiophene in the total sulfur 36.4 mg / kg.

[0035] Coking refined benzene is mixed with 0.403mol / l potassium permanganate aqueous solution, the mixing volume ratio is 1:2.5, stirred once under neutral conditions of 50°C, the unsaturated hydrocarbons in coking refined benzene can be removed, and at the same time, part of the Coke thiophene in refined benzene, reduce pickling colorimetry, bromine value and total sulfur content indicators. ...

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Abstract

The invention relates to a method for removing unsaturated hydrocarbon and thiophene from coking benzene, which comprises the following steps: stirring potassium permanganate, a metal chloride water solution and coking benzene in a container for reaction; converting the unsaturated hydrocarbon and the thiophene in the coking benzene into substances capable of dissolving in water easily, and separating and washing the substances; and then refining to obtain the coking benzene. The method is suitable for coking benzene, coking crude benzene, petroleum benzene, methylbenzene, reagent benzene and the like, and ensures that the acid washing color index is not deeper than 0.1g / l, the bromine number is not higher than 0.03g / 100ml, the total sulfur content is not higher than 1mg / kg, and the quality index reaches the quality level of the superior product of the coking benzene in China standard.

Description

technical field [0001] The invention relates to a method for removing impurities in coking benzene, especially a method for removing unsaturated hydrocarbons and thiophene impurities in coking benzene with potassium permanganate, and also includes removing coking crude benzene, petroleum benzene, toluene and Unsaturated hydrocarbons and thiophene impurities in solvent benzene. Background technique [0002] Coking benzene contains unsaturated hydrocarbons and thiophene, which makes it difficult for coking benzene to reach the quality level of high-quality coking benzene in the national standard for acid-washing colorimetry, bromine value and total sulfur content, which limits the application field of coking benzene. [0003] The quality index requirements for superior products of benzene products in the existing national standards are: the implementation of the standard GB / T2283-2008 for superior products of coking benzene, the colorimetric color of pickling is not deeper tha...

Claims

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Application Information

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IPC IPC(8): C07C15/04C07C7/148C07C15/06
Inventor 赵炜李小良段玉亲龙厚坤苗茂谦谢克昌
Owner TAIYUAN UNIV OF TECH
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