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Method for detecting chlorine content in crude benzene

A chlorine content, crude benzene technology, applied in the direction of measuring devices, chemical method analysis, chemical analysis by titration, etc., can solve the problems of high cost of waste liquid treatment, complicated analysis and detection process, large investment in drugs, etc., and achieve the expansion of concentration Increased detection range, improved analysis efficiency, and time-saving effects

Pending Publication Date: 2022-03-15
TANGSHAN XUYANG CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing detection method has high waste liquid treatment cost, complex analysis and detection process, high operation difficulty, large drug investment, and sometimes inaccurate detection results. Therefore, a more convenient, adaptable, and easy-to-handle detection method is still needed

Method used

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  • Method for detecting chlorine content in crude benzene
  • Method for detecting chlorine content in crude benzene
  • Method for detecting chlorine content in crude benzene

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1-5

[0031] Crude benzene mock sample

Embodiment 1-5

[0035] The crude benzene simulated samples whose chlorine content is respectively 0.2mg / L, 20mg / L, 200mg / L, 2000mg / L, and 5000mg / L in Preparation Examples 1-5 are introduced into the injector respectively, and the injection volume is 8 μ L. Using nitrogen as the carrier gas, mix the crude benzene simulated sample, oxygen and carrier gas, so that the crude benzene simulated sample can be fully burned in the combustion chamber. The temperature of the combustion chamber is: the inlet temperature of the combustion chamber, the cracking temperature in the combustion chamber, the The outlet temperatures are set to 700°C, 850°C and 700°C respectively, and the chlorine element in the sample is converted into hydrogen chloride, which is absorbed in the titration cell.

[0036] A 70% aqueous solution of acetic acid (volume fraction, the same below) was used as the electrolyte. In the titration cell, the combustion product and the titrant Ag in the titration cell + The following reactio...

Embodiment 6-10

[0044] Experiments were performed in the same manner as in Examples 1-5 to carry out Examples 6-10, except that the injection volume was changed from 8 μL to 3 μL.

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Abstract

The invention relates to a method for detecting the chlorine content in crude benzene, which comprises the following steps: (1) bringing a crude benzene sample into a combustion tube by carrier gas, mixing with oxygen, combusting, and converting the chlorine element in the sample into hydrogen chloride to obtain a combustion product containing hydrogen chloride; (2) the combustion product enters the titration cell and reacts with a titrant Ag < + > in the titration cell as follows: Ag < + > + Cl <->-AgCl <->; wherein the electrolyte in the titration cell is an acetic acid solution; and (3) reducing the concentration of Ag <-> in the titration cell due to Ag < + > consumed in the step (2), so that the potential difference between the indicator electrode pairs is changed, and calculating the chlorine content in the crude benzene. According to the method disclosed by the invention, the concentration detection range can be expanded under the condition that an analysis result is not influenced, the analysis efficiency is improved, and time and cost are saved.

Description

technical field [0001] The invention belongs to the field of analysis and detection of crude benzene, in particular to a method for detecting chlorine content in crude benzene. Background technique [0002] According to the process characteristics, the chlorine content of crude benzene products in conventional coking plants will not exceed 5mg / L, so it is generally not necessary to test during refining. However, due to process changes and pollution in circulation links, the chlorine content of crude benzene exceeds the range, which will cause corrosion of subsequent refining and production equipment. Generally speaking, the chlorine content in the current refining and production system should not exceed 6mg / L, but the content may still exceed the standard in actual production. Therefore, it is necessary to control the chlorine content according to this index, so as to improve production The condition of the system pipeline, control its corrosion and internal corrosion of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
CPCG01N31/164
Inventor 杨卫娟杨文梁徐海军李婷杨茹娟王艳霞王仲瑞
Owner TANGSHAN XUYANG CHEM IND CO LTD
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