DESIGN AND CONTROL OF ABSORPTION TOWER ON NITRIC ACID PRODUCTION PROCESS


Name:

  1. Frisca Biansha Y. (NRP. 2312 106 009)
  2. Fitri Widhiastuti (NRP. 2312 106 012)

Department:

Chemical Engineering FTI-ITS

Lecturer:

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

 

ABSTRACT

In the process manufacture of nitric acid, there are three things that become optimum parameters of nitrogen dioxide absorption process, which yield, concentration of nitric acid, and the concentration of nitrogen dioxide that not absorbed (usually called NOx). From the three optimum parameters, amount of the yield still can be maximized and NOx content of tail gas should be minimized because NOx is a pollutant gas and has recently become a concern because their numbers are increasing in the ambient air. Absorption process in the manufacture of nitric acid is very important because it controls the levels of NOx and amount of nitric acid produced yields occur in this process. 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. For the selection and controlling the absorption tower design must be considered to get the design and proper operating conditions for the absorption process. The purpose of this experiment is to determine the absorption tower design that can maximize the yield of nitric acid and reduced levels of NOx is generated in absorption process of the manufacture of nitric acid, done steady state and dynamic simulation approaches in absorption process absorption tower manufacture of nitric acid, 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 PlusTM and do trial and error control absorption tower structure 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.

Keyword : Absorption Tower, Nitric acid, NOx, Aspen PlusTM

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