nitric acid reduction
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Discuss the advantages and disadvantages of catalytic nitric acid reduction and uncatalyzed nitric acid reduction in the nitric acid reduction unit of coal-based ethylene glycol plants
This post was last edited by qugd on 2020-4-14 15:39. What is being discussed? What’s your opinion? Please first provide a relatively general overview to everyone of the processes involved in the nitric acid reduction unit of coal-based ethylene glycol production facilities – namely catalytic nitric acid reduction and uncatalyzed nitric acid reduction – including their flow diagrams, material balance and energy balance, as well as the equipment and process conditions. Then you mention the specific topic you want to discuss, so that everyone can participate in that topic. Or simply put, which of these two different processes do you think is better? What is the basis for judging quality?
In my opinion, the current nitric acid reduction technologies are mainly uncatalyzed nitric acid reduction and catalyzed nitric acid reduction; these are also the primary types of systems used in MEG production facilities in China at present. Catalyst-free nitric acid reduction is relatively safe, but its ability to fully reduce nitric acid is lower. Catalyst-assisted nitric acid reduction requires a certain concentration of nitric acid in the feed stream, around 3%, and the nitric acid content in the output stream remains acceptable. Therefore, a combination of uncatalyzed and catalyzed nitric acid reduction is quite appropriate.
After reading your reply, I would like to know how nitric acid exhibits its reducing property in the reaction process you mentioned In other words, how does nitric acid exert a reducing effect?
Nitric acid is generated as a by-product of the system reactions; therefore, it is necessary to reduce the nitric acid produced by these reactions into the nitrogen oxides required by the system, so that they can be reused within the system. It’s not the reducibility of nitric acid.