Device and method of measuring PH value

Abstract

An equipment for measuring the pH value of fluid is composed of a container full of the fluid whose pH value will be measured, a pump arranged in the pipeline of the discharge outlet of said container, and a fluid-trough arranged between the fluid inlet of said container and said pump for inserting a pH electrode in it. Its method features that the fluid is pumped from the container into fluid through for measuring its pH value. Its advantage is in-line continuous measuring.

Description

technical field [0001] The present invention relates to a measuring device and method, more specifically, to a device and method for measuring fluid pH. Background technique [0002] In many chemical processes, it is necessary to measure the pH value of the fluid to characterize the acid concentration in the fluid and to control the reaction at a certain pH value. Usually, the carriers of hydrocracking and hydrorefining catalysts are mostly prepared and synthesized by gelling method. In the process of preparing catalyst carriers by gelling method, aluminum salt solution (or acid solution) and alkali solution (or alkali metal salt solution) are used. ) is the basic raw material, and undergoes a neutralization reaction to form a slurry. The pH value of the slurry has a direct impact on the properties of the carrier and is one of the important process parameters in the gelling process. At present, when measuring the pH value of the slurry, the electrode sensitive membrane is ...

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Problems solved by technology

[0003] Although the above-mentioned intermittent measurement method can prolong the service time of the pH electrode, and the electrode can be used until the end of gelation, there are the following problems: first, when the gelation starts, the raw material enters the neutralization tank, and the pH value of the slurry fluctuates greatly It takes a long time (about five minutes) to stabilize the pH value of the slurry within the required range by manually adjusting the valve to control the flow of acid and alkali solutions

Secondly, the time in each measurement interval cannot ensure that the pH value of the slurry is within the required range, thereby affecting the quality of the prepared carrier

Moreover, the automatic control of the gelation process cannot be realized by adopting the batch method.

Therefore, in actual production, operators with long-term working experience are required to produce qualified products. Often due to human factors, the process data of the gelling process is not repeatable.

In addition, the method takes a long time to work, is labor-intensive, and has unfriendly operating conditions.

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