Large amount of sulphur is produced from base metal industries and recovery from crude oil, natural gas etc. In base metals industry, sulphur dioxide obtained during smelting of sulfide ores are fixed as sulphuric acid. In oil and gas industry, sulphur need to be removed from the oil and gas for the sake of health, safety and environment.
Following is the chart of sulphur supply in 1998, 2004 and 2009.
Impurities exist even in the very good quality of sulphur produced by frasch-process or claus-process in the form of hydrogen sulfide, suspended material, sulphur acids, moisture, sulphur dioxide, carbonaceous material and dissolved nitrogen and oxygen. In order to improve the quality, productivity and reduced risks, various test methods are followed by the testing professionals including wet chemical techniques.
These quality checks help in structuring the special handling system for sulphur with poor quality. There are different classifications for quality of sulphur produced by different processes like Frasch, Claus etc. Classification for Frasch process is most common among all. Also sulphur analysis methods adopted by the Frasch process sulphur producers are cost effective and less time consuming.
The main parameters which are most frequently measured for the quality control of products are as follows-
All testing methods are denoted by unique codes like- S- IR08, CSA06v, S-CAL06, S-CAL06A, S-IR07, S-GRA06, S-GRA06A, S-GRA08 etc.
Laboratory sample should be prepared and Luminious reflectance should be attended before starting the analysis.
What is Luminous reflectance- It's a measure of brightness of sulphur in specified condition according to the scale defined by international commission. Very pure sulphur has luminous reflectance of 86%.