CONTROL OF ABSORPTION TOWER ON NITRIC ACID PRODUCTION PROCESS


Name:

  1. Novan Adhi Prakasa (NRP. 2311 100 143)
  2. Cakra Ganesha Satya (NRP. 2311 100 173)

Departement:

Chemical Engineering FTI-ITS

Advisors:

  1. Prof. Ir. Renanto Handogo, M.S., Ph.D.
  2. Juwari Purwo Sutikno ST., M.Eng, Ph.D.

ABSTRACT

Three things that must be considered in nitrogen dioxide absorption process are nitric acid concentration, the concentration of nitrogen dioxide which is not successfuly absorbed (commonly called NOx), and the absorption’s yield. From these three things, the yield resulting from the absorption process can still be enlarged and the amount of NOx tail gas should be minimized as low as possible because NOx is one of a group of gas that cause pollution to ambient. Controlling the amount of NOx and how much yield generated nitric acid, occurs in the absorption process, so controling the absorption column in the production of nitric acid is very important. However, in normal process of absorption of nitric acid concentration can not expanded because of a mixture of nitric acid and water have the azeotropic point at a concentration of 68% nitric acid. The purpose of this experiment is to make dynamic simulation approaches in absorption process absorption tower manufacture of nitric acid and determine the absorption tower control structure to obtain operating conditions to maximize yield and minimize NOx nitric acid produced in the manufacture of nitric acid absorption. Methodology of this experiment begins with absorption tower design that will be used in the simulation, perform steady-state and dynamic simulation of absorption processes using Aspen HYSYS 7.3. Also determine and compare absorption tower structure controller (Proportional Integral Controller and Model Predictive Controller) that is able to tolerate smaller deviations using the minimum IAE. Preliminary data were used in this study refers to the PT. Multi Nitrotama Chemistry (MNK) as the basic study by comparing the results obtained with appropriate research journals. The results indicated the response of the PI controller and Model Predictive Controller with determined configuration showed that the absorption tower capable of producing nitric acid mole fractions of 59.40% (PI controller) and 59.72% (MPC). As well as the results of simulations that have been carried out, the average value of the minimum IAE generated from tuning method IAE with impaired + 20% weak acid liquid flow rate of 0.02723 to 0.01332 PI Controller and Model Predictive Controller.

Keywords: Aspen HYSYS 7.3, Nitric Acid, Absorption Tower, NOx, PI Controller, Model Predictive Controller.

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