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Detection method of impurities in sulfur dioxide from tail gas recovery

A technology for the recovery of sulfur dioxide and tail gas, which is applied in the field of analysis to achieve the effects of high accuracy, good control of production and good stability

Active Publication Date: 2018-04-24
SHANDONG KAISHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a detection method for impurities in sulfur dioxide recovered from tail gas, which solves the problem of detection of impurities in sulfur dioxide in the recovery of tail gas from the production of sucralose and acyl chloride products. Gas chromatography is used for detection, which has high accuracy, easy operation and good stability. , which facilitates production control

Method used

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  • Detection method of impurities in sulfur dioxide from tail gas recovery
  • Detection method of impurities in sulfur dioxide from tail gas recovery

Examples

Experimental program
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Effect test

Embodiment 1

[0050] (1) The sulfur dioxide recovered from the tail gas of producing sucralose is naturally volatilized at room temperature, and a small amount of residue is not volatilized;

[0051] (2) Add 3 mL of methanol to dissolve the volatile residue and weigh it;

[0052] (3) According to the production process analysis, it can be known that the impurity contained therein is trichloroethane, and the substance obtained in step (2) is detected by gas chromatography, and the standard substance is used to locate, and the normalized percentage content of each peak is recorded, and the impurity three Ethyl chloride was quantitatively analyzed.

[0053] Described gas chromatography, working condition is as follows:

[0054] Chromatographic column: HP-5 capillary column, column length 30m, column inner diameter 0.25mm;

[0055] The stationary phase of the chromatographic column is 5% phenyl-95% methylpolysiloxane stationary phase;

[0056] Carrier gas: nitrogen;

[0057] The carrier gas...

Embodiment 2

[0074] (1) by producing the sulfur dioxide 400g that terephthaloyl chloride tail gas reclaims, volatilize naturally at room temperature, have a small amount of residue and can not volatilize;

[0075] (2) Add 3 mL of ethanol to dissolve the volatile residue and weigh it;

[0076] (3) According to the production process analysis, it can be known that the impurity contained therein is DMF, and the substance obtained in step (2) is detected by gas chromatography, and the standard substance is used to locate, and the normalized percentage content of each peak is recorded, and the impurity trichloroethane Perform quantitative analysis.

[0077] Described gas chromatography, working condition is as follows:

[0078] Chromatographic column: HP-5 capillary column, column length 30m, column inner diameter 0.25mm;

[0079] The stationary phase of the chromatographic column is 5% phenyl-95% methylpolysiloxane stationary phase;

[0080] Carrier gas: nitrogen;

[0081] The carrier gas ...

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Abstract

The invention belongs to the technical field of analysis and particularly relates to a method for detecting impurities in sulfur dioxide recovered from exhaust gas. The method comprises the following steps: (1) recovered sulfur dioxide is volatilized, and volatilization residues are obtained; (2) the volatilization residues are dissolved in an organic solvent; (3) a substance obtained in the step (2) is detected with a gas chromatographic method, positioning is performed through a standard, and the impurities are subjected to quantitative analysis. The method for detecting the impurities in sulfur dioxide recovered from the exhaust gas realize tracking detection of sulfur dioxide, is time-saving, labor-saving, high in accuracy and good in stability and can control production better.

Description

technical field [0001] The invention belongs to the technical field of analysis, and in particular relates to a method for detecting impurities in sulfur dioxide recovered from tail gas. Background technique [0002] Liquid sulfur dioxide is generally produced by reacting sulfur with oxygen. At present, in many production processes of sucralose and acid chloride products, thionyl chloride is used to participate in the chlorination reaction, and a large amount of tail gas is generated during the synthesis process, including hydrogen chloride, sulfur dioxide, trichloroethane, dimethylformamide, etc. The exhaust gas is directly discharged to pollute the environment, and by-products such as pure hydrochloric acid and sulfur dioxide are obtained through the absorption and analysis of the exhaust gas by the absorbent. [0003] In the application of recovering sulfur dioxide, its use is affected by its impurities. For example, in the production of thionyl chloride, the presence of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/88
CPCG01N30/88
Inventor 田恒强李文娟张善民高名涛赵文凤李云龙韩楠楠
Owner SHANDONG KAISHENG NEW MATERIALS
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