Method for detecting hydrogen sulfide (H2S), carbon dioxide (CO2) and hydrogen cyanide (HCN) in acid gas

A carbon dioxide and detection method technology, applied in the field of inspection and testing, can solve the problems of detection methods such as hydrogen sulfide, carbon dioxide and hydrogen cyanide, etc., and achieve the effect of rapid detection and strong operability

Inactive Publication Date: 2013-09-11
ANGANG STEEL CO LTD
View PDF4 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, so far, there are no domestic standards for the detection of hydrogen sulfide, carbon dioxide, and hydrogen cyanide in the acid gas of the desulfurization and dehydrogenation process, and there are no relevant detection methods for hydrogen sulfide, carbon dioxide, and hydrogen cya

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0049] The detection method of hydrogen sulfide, carbon dioxide and hydrogen cyanide in acid gas in the desulfurization and dehydrogenation process of the present invention mainly includes two processes of sampling and analysis and determination, and the analysis and determination includes the content detection of hydrogen sulfide, carbon dioxide and hydrogen cyanide. The method is:

[0050] 1. Sampling:

[0051] Use two absorption bottles to divide 50ml of potassium hydroxide with a mass percentage concentration of 30%, add 3 drops of phenolphthalein indicator each, absorb the gas until the red color of the solution disappears; combine the two absorption bottle solutions into a 1000ml volumetric flask, add high-purity water to scale, and mix well.

[0052] 2. Carbon dioxide content analysis:

[0053] The carbon dioxide in the acid gas is absorbed by potassium hydroxide to form potassium carbonate, which reacts with calcium chloride to form calcium carbonate precipitate, whi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method for detecting hydrogen sulfide (H2S), carbon dioxide (CO2) and hydrogen cyanide (HCN) in acid gas. The method comprises the following steps: combining a mixing solution of potassium hydroxide and a phenolphthalein indicator which are contained in different flasks in a volumetric flask; and adding pure water until reaching the scale, wherein potassium carbonate is generated by the CO2 adsorbed by the potassium hydroxide and reacts with calcium chloride to generate a calcium carbonate precipitation; the calcium carbonate precipitation is dissolved and titrated by using hydrochloric acid and a sodium hydroxide solution respectively, so that the content of the CO2 is obtained. The H2S adsorbed by the potassium hydroxide can generate potassium sulphide which reacts with a zinc acetate solution, so that a flocculent yellow precipitation is generated; an excess amount of standard iodine solution is added under the acid condition; the back titration is performed by using sodium thiosulfate; the content of the H2S is computed after blanking. After the HCN is adsorbed by potassium hydroxide, lead carbonate solid powder and a rhodanine indicator are added; the content of the HCN is computed after blanking. The method is rapid in detection speed and strong in operability; the precision and accuracy of the method can completely meet the requirement of a coking desulfurization and dehydrogenation process. Thus, the accurate detection data for the coking desulfurization and dehydrogenation process is provided.

Description

technical field [0001] The invention belongs to the technical field of inspection and testing, and in particular relates to a method for detecting hydrogen sulfide, carbon dioxide and hydrogen cyanide in acid gas in a desulfurization and dehydrogenation process. Background technique [0002] At present, the desulfurization and dehydrogenation process used in the domestic coking production process generally adopts the ZL old-fashioned potassium thiocyanate method, which has the problem that the desulfurization effect is not obvious and often exceeds the standard, so it cannot meet the technical requirements of the desulfurization and dehydrogenation process. For this reason, some enterprises have established a new vacuum potassium carbonate desulfurization and dehydrogenation process, and added an acid production process, but it is necessary to re-establish the detection methods for hydrogen sulfide, carbon dioxide, and hydrogen cyanide in the acid gas of the desulfurization a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01N21/78G01N21/82
Inventor 潘彤林英春杜志刚宗树芬谢卫军
Owner ANGANG STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap