High total nitrogen in pure methanol
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Our factory uses 4-column distillation; currently, the total nitrogen content in the purified methanol exceeds 1 PPm. The high level of total nitrogen is mainly due to the pressure column, and this does not meet the customer’s requirements. We are seeking advice on how to reduce the total nitrogen content in the product.
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Is total nitrogen analyzed in methanol? It seems there is no such analysis item; I’ve been managing distillation for 4 years and have never encountered it, nor in polyol production nor in monolcohol production.
I heard for the first time that this item is not included in the comprehensive analysis of methanol products either.
What is your methanol production scale? How much alkali is added in the pre-treatment tower, and what is the pH value after treatment? ?