Report The Process On The Project Of Ph Value

1566 words - 6 pages

Report the process on the project

Report of current process on the project

PH value is a very common chemical on-line measurement in process industry. A good pH control performance is the final target. However, there are many different elements that all contribute to pH control problem, including the basic understanding of what pH value actually is, pH measurement, pH modeling and simulation and finally the actual pH control. All these elements are tried to look into, at least superficially.

In order to understand better the principles of modeling and controlling the pH value, and achieve the actual pH value, these steps are proposed to follow which are shown as below:

The first step is to be familiar with the basic properties of liquids, ionic reactions and what is their relation to pH value. The study includes the properties of liquids, chemical reactions, acid and bases neutralization and the definition of pH.

Second step is pH measuring, simple specification based on the titration collect data from real site. In many cases the quality of the pH measurement is the reason for poor pH control performance. Different pH measuring principles solutions and weaknesses are learnt.

Third step is pH modelling: comperation of static and dynamic model, the traditional pH dynamic models: wiener models, reaction invariants and physico-chemical models that separate the dynamics and highly nonlinear static ph mapping are learnt and analysis. Define the variable data in the pH neutralization process; build the mechanistic model for the real pH neutralization tank.

Forth step is pH control diagram design: The basic control paradigms, including feedback and feed forward structures, applied to pH process are compared and leant. Linearised the feedback control by using an inverse of the titration curve.

Model based PI controller design.

Closed-loop control system simulations.

Analysis and conclusion.

pH modelling

pH models are crudely divided into static and dynamic models

Static models are valid when the system has reached the equilibrium. The acid-base unit reactions can be considered instantaneous and therefore static modeling is a very natural approach. Static models include titration curves and distribution diagrams.

Titration curves are traditional classical pH-models. They describe the pH-value as a function of acid-base content difference. The shape of the titration curve is determined by the participating chemical components.

Titration curve shows the dependency between pH (function of oxonium ion activity) and acid/base concentration. Strong acids and bases dissociate completely and their ion concentrations are total concentrations as well. Weak components only dissociate partially and their ion concentrations have to be calculated from equilibrium constants.

Dynamic pH process modeling

Dynamic modeling is fundamentally more difficult than static modeling. Static modeling concentrates only on the...

Find Another Essay On Report the process on the project of PH value

The Affects of Acid Rain on pH and Alkalinity

984 words - 4 pages to an acidic level. Some necessary nutrients can only dissolve in a specific level of pH. If the pH is lower, certain poisonous substances can dissolve into the water and kill the living organisms.The amount of hydrogen ions (H+) in a solution is called the pH. pH is based on a scale from zero to fourteen; zero being the most acidic and fourteen being the most basic (alkaline). On the pH scale, distilled water is pH 7, which is also neutral. On

Dying with Dignity is about the whole process of PAS - Ph. Assisted Suicide. It gives good arguments on why PAS should be permitted in all states

994 words - 4 pages Dying With DignitySuicide. What a compelling word. When looked up in the dictionary, this word is defined:"su ïi cide- n. of oneself, 1 the act of killing ones self intentionally 2 ruin of ones interests . . . "The act of taking ones life, on purpose. Interesting. Now add a second word to this already intriguing utterance. Assisted. Assisted Suicide. When looked up in the dictoinary the word assisted is defined as:"as ·sist- vt. 1 to

Chemistry Project: Acids and Bases & the pH Scale

1522 words - 6 pages solution. Initially, his theory was thought to be wrong, and his thesiswas given the lowest possible passing grade. However, later on Arrhenius' theory ofelectrolytic dissociation became generally accepted, and eventually became one of theprinciples of modern chemistry.The pH scale measures the concentration of H+ and OH-. The pH scale wasdeveloped because the concentration of the solution can vary by many factors over time,and a pH scale was the

The Effect of pH on the Activity of the Enzyme Amylase

1658 words - 7 pages The Effect of pH on the Activity of the Enzyme Amylase Aim :- To find the effect of pH on the activity of the enzyme amylase. An enzyme is a type of protein found in all living cells. Enzymes act as biological catalysts, breaking down substrates without needing a high temperature, allowing all the chemical reactions of metabolism to take place, regulating the speed at which they progress, lowering the activation

Determining the Influence of pH on the Activity of Catalase Enzyme in Potato Tuber Cells

2302 words - 9 pages chemical applications.A pH is the measure of the acidity or alkalinity of a solution (see figure 1). An acidic solution has many hydrogen ions (H+) and a pH below 7. An alkaline, or basic, solution has very few hydrogen ions and a pH above 7. A neutral solution has a pH of 7.The optimum pH of an enzyme, is the value of pH at which the enzyme has its maximum efficiency.Figure 1. Increasing alkalinity and acidity on pH scale.In this experiment

EXPERIMENT: Effect of Dissolved Carbon Dioxide on the pH of water

1686 words - 7 pages HSC BIOLOGY ASSESSMENT TASK 1 Conductor: Wissam Bardouh HSC BIOLOGY ASSESSMENT TASK 1Maintaining a BalanceTask: Open-ended investigationOur task is to plan, choose equipment and perform a first hand investigation to demonstrate the effect of dissolved carbon dioxide on the pH of water.Due Date: 21/11/07Conductor: Wissam BardouhEFFECT OF DISSOLVED CARBON DIOXIDE (CO2) ON pH OF WATERIntroduction:((Carbon Dioxide is a greenhouse gas. It is

The Effects of Varying pH Levels on Syngonium Podophyllum - Sheldon College, Biology - Biology EEI

865 words - 4 pages BIOLOGY EEI Aim To determine the effect variable levels of pH (4, 7 and 10) of water have on six cuttings of Syngonium podophyllum. Introduction/Background Information Soil pH is an indication of the acidity or alkalinity of soil and is influenced by several factors including the parent material (the rock from which the soil originated), rainfall (which can cause leaching of minerals and nutrients) and irrigation water, climate and

An online project report on care information on the web

867 words - 3 pages having names or addresses on them, for people to be able to contact them. Having names, addresses and telephone numbers on a site is a good way of telling if a site is a reliable source of information. Value of the web-search project The project made an interesting contribution to my course studies because it helped me to find out a little bit about other people and what they were interested in. Also by looking at web sites that other people had

Enzyme Kinetics Lab Report: The reaction rate of enzyme, '-amylase in Starch-Iodine solution at different temperatures and pH levels

1996 words - 8 pages starch-iodine solution at different pH levels: 4.0, 4.5, 5.0, 6.0, 6.5, and the second research to determine the starch-iodine solution at different temperatures: 15'', 30'', 45'', 55'', 60'', 70??.Before the proceeding of an experiment, makes sure the spectrometer turned on for at least 15 minutes to be warm. After turning on the spectrometer set the wavelength at 560nm. Add '-amylase to starch-iodine solution. To examine the starch-iodine

Chemical Lab on The Effects of pH and Various Other Substances on the Function of Peroxidase - AP Biology

1153 words - 5 pages the surface. The null hypothesis was supported by the x2 value from the chi squared table because it was less than the comparative value. Also, many of the groups on the chart must be rendered inconclusive because the standard error bars from the standard error or table overlap in several cases. This experiment is important because if important papers were dropped into a pond affected with acid rain, we would know to return the pond to its normal pH of 7 to allow the papers to rise to the surface quicker. 1

Industry Project Report on the Australian Private Health Fund Industry

3248 words - 13 pages regimes - indicating that consumers' demands can respond rapidly to changes in incentives.This implies that, contrary to general belief, Private Health Fund Cover has a very elastic demand, and any changes to its benefits, be either cost (premiums) or value (affordability), causes a significant shift in demand.SummaryHealth funds seek to compete on the basis of price, product, marketing, and contracting, but their behaviour in some of these areas is

Similar Essays

The Ph Value Essay

543 words - 2 pages THE PH VALUE & THE ELECTRICAL CONDUCTIVITY OF A SOLUTIONJOOYEON PARKAIMTo know how to check the PH value of a solution and to see the relationship between the PH value and the electrical conductivity.MATERIALSUniversal indicator, litmus, phenolphthalein, water, 6 beakers, wires, light bulbs, test tubes, metal conductors, solutions of: Ba(OH)2, NaOH, Na2CO3, CuSO4, H2SO4, CH3COOH, NH3*H2OMETHODPlace a drop of each solution and water on

The Effect Of Level Of P H And Temperature On Catalase Enzyme Activity Over Oxygen Produce Report

1595 words - 7 pages hydrogen peroxide into harmless water and oxygen gas. Dependent variable Catalase enzyme activity (measured as % of oxygen produced) Independent variable 1 experiment: pH 2 experiment: temperature Controlled variable Amount of time The purpose of this lab was to determine the effect of pH and temperature on the rate of catalase enzyme activity. Since the catalase speeds up the

This Is A Short Report About The Dissufion Of Carbon Dioxide On The P H Of Water. Bghs Biology Report

423 words - 2 pages colour of the water to a cloudy/ milky colour. PART B OF EXPERIMENT: Firstly, 100ML of distilled water was filled into a 250ML beaker. 3 drops of universal indicator was added as the PH probe was connected to the data logger and turned on. Then the PH probe was placed into the beaker and carbon dioxide was dissolved into the water using a straw for approximately 2 minutes and 40 seconds. During the process the water changed from a green colour which

The Effect Of Ph Of Water On Plant Growth

809 words - 4 pages The pH scale is used to measure the concentration of hydrogen ions and the acidic and alkaline content in a liquid. The abbreviation pH stands for percent hydronium ion. The pH scale starts from 0 being the most acidic, to 14 being the most alkaline, and 7 being neutral. Water is the only liquid that is neutral, but most other liquids are near neutral, ranging just slightly above or below 7 on the scale. There are several soil factors that