Petrochemical
The petrochemical industry, often referred to as the petroleum and chemical industry, is an important component of the chemical industry.
In many refineries, corrosion caused by hydrogen sulfide is so severe that it must be monitored by an online pH Sensor. By monitoring the pH of the acid water neutralization process, corrosion can be effectively prevented, extending the service life of overhead condensers and other process piping. This can significantly reduce maintenance costs, decrease the amount of corrosion inhibitors used, and greatly shorten unscheduled downtime.
In the crude oil distillation unit, abnormal changes in pH can pinpoint faults in the desalting system. Measuring pH at the desalting stage helps break down emulsions and prevents contaminants from poisoning the expensive catalysts used downstream.
Hydrocracking and hydrotreating units are also susceptible to corrosion by sulfide scale, and the high-temperature, high-pressure operating conditions place even greater demands on the reliability of pH measurement. The pH measurement point in the stripping tower is subject to even stricter requirements, as it serves not only to prevent corrosion but also to enhance stripping efficiency.
In the petrochemical industry, particularly in ethylene production, pH measurement plays a critically important role. For instance, the quench water in the quench tower is heavily influenced by the reaction, becoming turbid and highly corrosive—conditions that pose significant challenges for accurate pH measurement. An inaccurate pH reading can reduce product yield, compromise compliance with effluent discharge standards, and even jeopardize process safety. The primary objective of pH measurement at such dynamic points is to optimize process operation; under these demanding conditions, only a highly reliable analytical system can deliver precise and reliable pH measurements.
Common measurement problems are often caused by particulate blockage of the electrode diaphragm, as well as physical fouling or chemical reactions that coat the sensitive membrane. Diaphragm blockage leads to offset or drift in the measured values, while coating of the sensitive membrane can extend the response time from 10 seconds or less to several minutes. Even a surface layer as thin as 1 mm can prevent pH measurement altogether.
Our company’s pH electrodes feature an internationally advanced Teflon diaphragm, ensuring a stable liquid junction. They exhibit strong anti-interference performance, are resistant to contamination and clogging, and offer a long service life.
In the petrochemical industry, our company recommends the following Sensors:
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