Praktikum UOP 2 - Modul Pengendalian pH

Summary

This video script covers an experimental procedure on pH control using a system in an operational setting. The process involves preparing solutions, mixing chemicals, and operating pumps and compressors in a controlled environment. The first part focuses on manual pH control, observing the system's response, and making adjustments. The second part shifts to automatic pH control, where setpoints are adjusted, and responses are monitored to achieve a stable pH. The final steps involve gathering results and powering off the system, ensuring the process is thoroughly recorded and controlled for accurate data collection.

Takeaways

• 😀 The experiment involves controlling pH levels in tanks using a combination of acids, bases, and automated systems.
• 😀 The primary chemicals used are 20 mL of H2SO4 (Sulfuric Acid) and 40 grams of NaOH (Sodium Hydroxide) dissolved in 70 L of water.
• 😀 The experiment is divided into three parts: preparation, automatic pH control, and advanced pH control.
• 😀 In Part 1, the pH solution is prepared and stirred in tank T-51, then transferred to tank T-52 for further processing.
• 😀 The compressor and pH control unit (Miniplant WA 921) are activated to regulate the pH of the system.
• 😀 During Part 1, the system is manually controlled at 50% MV (Manipulated Variable) until the pH stabilizes.
• 😀 After stabilization, the MV is adjusted by 10% to observe the pH response and note the changes over time.
• 😀 In Part 2, the control system is switched to automatic mode, and the setpoint is adjusted to pH 8 once the pH stabilizes.
• 😀 Observations in Part 2 include monitoring pH fluctuations and recording when the pH exceeds or drops below the setpoint.
• 😀 In Part 3, further adjustments to PBTI and TD values are made, and the setpoint is changed again to pH 8.9 for advanced control.
• 😀 Throughout the experiment, data is continuously recorded, and the pH stabilization process is observed until no further changes are detected.
• 😀 At the conclusion of the experiment, the pumps and pH control unit are turned off, and the tanks are drained to complete the procedure.

Q & A

What is the purpose of the pH control experiment described in the transcript?

The purpose of the experiment is to control and stabilize the pH level in a system using various chemicals and equipment, including tanks, pumps, and a pH control unit.

What chemicals are used in the preparation for the pH control experiment?

The chemicals used in the preparation are 20 mL of H2SO4 (sulfuric acid) and 40 grams of NaOH (sodium hydroxide).

How is the NaOH solution prepared before being added to the tank?

The NaOH is dissolved in water from tank T-51 until it becomes homogeneous. This solution is then added to tank T-51.

What is the first step in the experiment after preparing the chemicals?

The first step after preparing the chemicals is to mix the NaOH solution into tank T-51 and stir it with a mixer. Then, H2SO4 is added to tank T-52 and stirred.

What is the role of the compressor and pumps in the experiment?

The compressor and pumps are activated to facilitate the flow of liquids through the system and maintain the pH control process.

What is the significance of setting the control system to 'manual mode' during the first experiment?

Setting the control system to manual mode allows the operator to adjust the opening value (MV) to 50% and observe the pH stability without automatic adjustments.

How is the pH control adjusted after the system stabilizes in the first experiment?

Once the pH stabilizes, the operator adjusts the setpoint (MV) by 10% and monitors the changes in pH, recording the values and times of each pH change.

What happens during the second experiment regarding the pH control mode?

In the second experiment, the control mode is switched to automatic, and the system is adjusted to stabilize the pH at the setpoint, observing and recording any changes in pH values.

What is done when the pH reaches the setpoint during the second experiment?

When the pH reaches the setpoint, the operator adjusts the setpoint to pH 8 and continues to monitor the pH, recording the changes and times of each fluctuation.

How is the pH control process further adjusted in the third experiment?

In the third experiment, the pH control is still in automatic mode, but the P, I, and D (proportional, integral, and derivative) parameters are adjusted to new values for more precise control, and the pH is monitored until it stabilizes.