Sequence of introducing alkylating caustic washing and water washing
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From the information I’ve seen, there are two approaches: 1. First, use a water wash coalescer; thereafter, carry out both alkaline washing and water washing. After adjusting the circulation flow rate of the alkaline wash solution, introduce the alkali solution and gradually adjust its pH to the required value for the process. 2. First, use an alkaline wash coalescer, while the water wash coalescer is used only to inject a certain amount of water. Once the flow rate and temperature of the circulating alkaline solution stabilize, then introduce the water wash coalescer and combine the water washing and alkaline washing processes. I’m not sure which approach is better; I tend to favor the first one, as I’m concerned that using the alkaline wash solution first might introduce it into the distillation system and cause corrosion. By the way, what are the precautions for water washing and alkaline washing? For example, what are the general requirements regarding the temperature, concentration, and operating pressure of the alkaline solution? Are there any other considerations I might have missed? I hope experts can help :)
If there is concern that the alkali solution might reach the rear area, one can first use the water washing cycle before switching to the alkali washing cycle; it’s just a matter of time. Alkali washing tanks and water washing tanks generally have coagulators, and the amount of medium carried to the subsequent stages is minimal.
Our product goes through acid washing, alkali washing, and then water washing, without a coalescer. Sometimes bring water.
Would it not be better to carry out only alkaline washing and use a coalescer to remove the alkaline solution, thereby reducing wastewater treatment needs, lowering energy consumption, and optimizing the process?
It is important to control the amount of wash liquid used in the reduction cycle, the alkali concentration, the liquid level in the alkali washing tank, and the pressure in the water washing tank; otherwise, the sedimentation effect will be poor.
During operation, consider the specific working conditions as well as the pressure and level levels of each tank, in order to prevent backflow
Without a coalescer, water carryover must be severe, right? The feed pump for the distillation tower must leak frequently
Pay attention to the temperature of the alkali solution and water; it is important for desulfurization and deacidification
Add a coalescer for the dealkalization solution and stop the water washing – that’s all there is to it!