Problems with desulfurization of liquefied gas
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Does the level of C5 in liquefied gas have an impact on thiol removal? The liquefied gas produced through coking is sent to a liquid film desulfurization and dewaxing unit; will a high C5 content affect the desulfurization efficiency?
There are control requirements for the C5 parameters in normal liquefied gas; so what is the standard for this so-called \"high\" level?
Personally, I don’t think so. Coking liquefied gas is difficult to treat; it has a high sulfur content, with carbonyl sulfide being the main compound that is hard to remove. At present, there are no effective solutions. Some approaches focus on using alkaline solutions for regeneration in order to reduce the backcarry of disulfides, while others involve adding catalysts for the hydrolysis of carbonyl sulfide; however, these methods do not address the problem fundamentally. If anyone here has good ideas, I would appreciate it if they could share them so that we can all improve together.
Some people have produced sterically hindered amines claimed to be able to desulfurize alcohols – is this true?
The C5 content in liquefied gas should not exceed 5%; it is generally kept below 3%. The C5 content cannot be used to control thiol sulfur levels – generally, only the hydrogen sulfide content in liquefied gas needs to be controlled. Why go ahead and control thiol sulfur levels? It’s useless. Desulfurization of liquefied gas is very simple; a basic washing process is sufficient to handle it.
A high C5 content has the following effects: 1. In the hydrogen sulfide removal process, the condensation of heavy components in the desulfurization tower can lead to foaming in the tower, reducing the efficiency of sulfur removal and even causing the amine solution to be carried along. 2. In the desulfurization process, high hydrogen sulfide levels cause the alkaline solution to become permanently deactivated. 3. Organic sulfur is present in the reformed fractions; as the C5 content increases, the amount of organic sulfur in the liquefied gas rises, thereby increasing the load on the desulfurization unit. Thus, it controls the C5 content in liquefied gas through catalysis.