Dear experts, straight-run naphtha faces the issue of high hydrogen sulfide content upon leaving the factory – how can this be controlled?
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Dear experts, straight-run naphtha faces the issue of high hydrogen sulfide content upon leaving the factory – how can this be controlled? The amount of ammonia added to the tower affects the pH level of the pipelines at the top of the tower, which makes corrosion prevention difficult. Moreover, national standards do not specify requirements regarding this parameter; however, there is indeed a risk associated with loading the product. How do you address this issue? Please answer definitely. Thank you in advance! ! !
If straight-run naphtha contains high levels of hydrogen sulfide, it can be removed by alkaline washing. If local regulations are strict regarding the discharge of waste alkali, a hydrogen sulfide stripping tower can be installed; however, both the operating costs and investment required for this approach are higher than those of alkaline washing.
Stirring is required; alkali washing won’t work as it affects the operation of the ethylene plant, mainly due to sodium ions.
It’s too costly to sell straight-run naphtha directly from the factory! You should know that it is an important and inexpensive raw material for hydrogen and ethylene production! ! If it has to be sold, sell it to those who produce solvent oil at a higher price! Of course, the hydrogen sulfide in straight-run naphtha needs to be treated, as most of the hydrogen sulfide in it is in the form of ionic sulfur. In China, the alkaline washing method is commonly used, followed by a wash with water. In this way, alkali slag that meets environmental standards is produced; it cannot be discarded carelessly – it needs to be treated as a responsibility to future generations! ! ! :lol :lol :lol :lol
If one wants to remove hydrogen sulfide from it, there are many processing methods available. But does the person in question mean to solve the problem without changing the existing processes? If that’s the case, it will be extremely difficult. Naphtha before it leaves the equipment definitely has some pressure; when it is sent to the finished product tanks, it is usually at atmospheric pressure, which means it undergoes flashing. As a result, some hydrogen sulfide will inevitably be released, and this is extremely dangerous in every regard. It would be better to invest some money in installing an additional system.
We have also encountered similar problems, using a fixed-bed catalyst method for hydrogen sulfide removal, with catalysts from Beijing Sanju.
There is no limit on hydrogen sulfide content in the quality specifications; however, the accumulation of hydrogen sulfide during loading poses a risk of poisoning. If that is the case, sealed loading along with an oil and light hydrocarbon recovery system could be considered; this would prevent the accumulation of hydrogen sulfide at the work site and enable the recovery of light hydrocarbons, thereby reducing loading losses. However, a hydrogen sulfide removal device is required for this purpose, and either alkaline washing or solid desulfurization agents can be used.
If there are no regulations in this regard, then simply use closed systems for loading and unloading oil; let the buyer handle the hydrogen sulfide issue on their own
If the poster has a coking hydrogenation unit, the atmospheric and vacuum distillation gasoline can be fed into that hydrogenation unit and processed together with the coked gasoline and diesel. The naphtha produced has a higher value than straight-run gasoline, and the hydrogen sulfide removed serves as raw material for sulfur recovery, which not only eliminates hazards but also increases profitability.