Why is acidic water injected at the top of the distillation tower?
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Everyone is aware of the purpose of injecting ammonia into the oil and gas pipeline at the top of the distillation tower. In our facility, after the ammonia injection point and before entering the oil and gas-hot water heat exchanger, acidic water is also introduced from the acidic water buffer tank. What is the purpose of this acidic water?
Since the raw materials contain elements such as sulfur and nitrogen, sulfur-nitrogen compounds are formed during the reaction process; these compounds are soluble in water. The purpose of adding water is to separate most of them from gasoline, so that they can be sent to an acidic water stripping unit as sulfur-containing wastewater. There are two objectives behind this: one is to reduce the difficulty of processing gasoline and ensure that the product quality meets standards； Second, it reduces corrosion on subsequent equipment. Take a look at this: http://bbs.hcbbs.com/viewthread.php?tid=399391
Preventing corrosion of hydrogen sulfide at the tower top vapor line: lol
Rinse away the ammonium salts formed by the injection of ammonia and corrosion inhibitors into the top of the tower, to prevent pipeline blockage.
Washing H2S can also prevent salt buildup in the distillation tower
This is mainly to consider water conservation and emission reduction, as an energy-saving alternative to softened water.
Washing H2S can also prevent salt buildup in the distillation tower, serving as a substitute for softened water (the acidic water produced by the facility is more energy-efficient than softened water, and there is no need to install a separate line for softened water)
It is mainly used to remove hydrogen sulfide, which can reduce the desulfurization load in subsequent units
Clean acidic vapors to prevent corrosion of pipes and heat exchangers! !
After ammonia injection, water is injected because ammonium chloride deposition may occur in the overhead distillation system after ammonia injection, and continuous water injection can be used to wash it away; it may also help remove some hydrogen sulfide.