【Alkylation】Requirements for the sulfur content of raw materials and conversion pathways in the alkylation process
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This post was last edited by Xiao Gong 1985 on 2016-4-3 09:59. What are the requirements regarding the sulfur content in the alkylation raw materials? From the information I found, for the HF acid method the value should be less than 20 mg/kg; for the H2SO4 method it should be less than 100 mg/kg. Controlling sulfide levels, especially those of thiols, can reduce acid consumption. However, under such requirements, if all the sulfur in the raw materials ends up in the product, the sulfur content will not meet the National V standard. Is it the reaction of thiol with acid to form sulfates that causes them to separate from the hydrocarbon materials, thereby reducing the impact of sulfur content in the product? What if it’s a thioether-type impurity? I would appreciate your guidance. Thank you!
This is the pattern, so sulfur in the raw materials generally has little impact on the quality of alkylated oils. It’s just an increase in acid consumption. Moreover, in the carbon tetra compounds after etherification, there are generally only low-boiling-point sulfides, mainly COS, methanethiol, etc. High-boiling thiols generally get enriched in MTBE.
The by-products of the reaction are soluble in sulfuric acid, and they are carried away by the waste acid discharged from the system; liquefied gas and oils are recovered from this waste acid, resulting in considerable annual profits. QQ1472359555