The influence of hydraulic oil buffer solution on the equipment of vacuum oil purifier purification device
2018/5/15 Viewers:
Buffer solution is usually composed of weak acid and weak acid salt, weak base and weak alkali salt solution. Such as acetic acid and sodium acetate, ammonia and ammonium chloride, phosphoric acid and sodium dihydrogen phosphate can all form buffer solutions. The characteristic of this buffer solution is to add a small amount of strong alkali and strong acid, or when the solution is diluting and shrinking, the acidity of the solution or the value of PH? Therefore, they can be used to prepare a series of standard pH values as a benchmark for colorimetric determination. Potassium hydrogen phthalate two molecular formula is: it is not only a weak acid, but also a weak acid salt, so itself can form a buffer solution. Because of its stable chemical nature and convenient use, it is often used as a trial preparation for the preparation of punching solution.
What are the factors influencing the determination of water-soluble acid (pH value) colorimetric method and the influence factors of water soluble acid (pH value) in colorimetric determination.
(1) the pH value of the test water itself has an obvious influence on the result of the state. GB7598--87 "the water soluble acid determination method of the transformer oil and turbine oil in the operation (colorimetric method)" stipulates that the water's pH value is 6.0~7.0 and the conductivity is less than 3uS/cm (25C) after the test is used to remove the CO2 by boiling water. The practice has proved that two times of distilled water is better. The pH value of boiling water is not easy to reach 6.0-7.0 because of the instability of desalted water. After boiling, it should be sealed and cooled to room temperature to measure the pH value again, so the quality of water should be stipulated. The purpose is to make the test of the fruit correct and have a uniform comparability.
(2) extraction temperature. When distilled water is used to extract low molecular acids in oil, the extraction temperature will directly affect the concentration of water towel acid in equilibrium, such as higher temperature and higher extraction temperature, but lower temperature. Therefore, at different temperatures, different results are often taken. 70-80C is also stipulated in the method, and a suitable condition is established as the basis for comparison. If the temperature is further stipulated, it will cause the vaporization and concentration of water, and also for easy operation. If the total amount is lower, the amount of Cui will be reduced. Therefore, it is appropriate to stipulate that the extraction temperature is 70~80C.
(3) shake time. Shaking time (that is to make the oil and water fully mixed surface into emulsion) is also related to the amount of Cui, that is, the shaking time is longer, the amount of extraction is more, and the time is shorter. However, the longer it is, the more balanced it is at a certain time. Therefore, it is stipulated in the method that shaking 5min. is one of the prescribed test conditions.
What are the factors influencing the determination of water-soluble acid (pH value) colorimetric method and the influence factors of water soluble acid (pH value) in colorimetric determination.
(1) the pH value of the test water itself has an obvious influence on the result of the state. GB7598--87 "the water soluble acid determination method of the transformer oil and turbine oil in the operation (colorimetric method)" stipulates that the water's pH value is 6.0~7.0 and the conductivity is less than 3uS/cm (25C) after the test is used to remove the CO2 by boiling water. The practice has proved that two times of distilled water is better. The pH value of boiling water is not easy to reach 6.0-7.0 because of the instability of desalted water. After boiling, it should be sealed and cooled to room temperature to measure the pH value again, so the quality of water should be stipulated. The purpose is to make the test of the fruit correct and have a uniform comparability.
(2) extraction temperature. When distilled water is used to extract low molecular acids in oil, the extraction temperature will directly affect the concentration of water towel acid in equilibrium, such as higher temperature and higher extraction temperature, but lower temperature. Therefore, at different temperatures, different results are often taken. 70-80C is also stipulated in the method, and a suitable condition is established as the basis for comparison. If the temperature is further stipulated, it will cause the vaporization and concentration of water, and also for easy operation. If the total amount is lower, the amount of Cui will be reduced. Therefore, it is appropriate to stipulate that the extraction temperature is 70~80C.
(3) shake time. Shaking time (that is to make the oil and water fully mixed surface into emulsion) is also related to the amount of Cui, that is, the shaking time is longer, the amount of extraction is more, and the time is shorter. However, the longer it is, the more balanced it is at a certain time. Therefore, it is stipulated in the method that shaking 5min. is one of the prescribed test conditions.
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