Oil detection scheme for water in the petrochemical industry

The necessity of oil detection in water in the petrochemical industry

The wastewater generated in the petrochemical production process often contains oil pollutants such as crude oil, lubricating oil, and hydrocarbon compounds. Its discharge must strictly comply with the "GB 31570-2015 Petroleum Refining Industry Pollutant Discharge Standard" (direct discharge limit of 5 mg/L) and the "GB 31571-2015 Petrochemical Industry Pollutant Discharge Standard". Oil pollutants not only disrupt the ecological balance of water bodies, but may also cause production accidents such as pipeline corrosion and catalyst deactivation. Therefore, developing efficient and accurate oil detection technology is the key to ensuring environmental compliance and production safety.

Selection of detection methods and compatibility with Hengmei instruments

The current mainstream detection methods include infrared spectrophotometry, ultraviolet spectrophotometry, gas chromatography, etc. Among them, infrared spectrophotometry (HJ637-2018 standard) has become the preferred method in the petrochemical industry due to the following advantages:

1.Compliant with national standards: directly connected to the standards of the Ministry of Ecology and Environment, supporting classification testing of total oil, petroleum, and animal and vegetable oils.

2.Strong anti-interference ability: By analyzing C-H bond vibrations using three wave numbers (2930 cm ⁻¹, 2960 cm ⁻¹, 3030 cm ⁻¹), complex components such as petroleum and polycyclic aromatic hydrocarbons can be effectively distinguished.

3.High compatibility: Supports multiple extractants such as tetrachloroethylene and n-hexane, avoiding the toxicity issues of traditional solvents such as carbon tetrachloride in infrared methods.

The Hengmei HM series infrared spectrophotometer is developed based on the above method, and its core technologies include:

• Intelligent calibration system: supports standard curve method and correction coefficient method, users can customize parameters, and adapt to different oil detection needs.

• High precision optical module: adopting electrically modulated light source (lifespan>10000 hours) and detachable integrated optical path design, the signal-to-noise ratio is increased by 300%, and the detection limit is as low as 0.04 mg/L.

• Full process quality control: Built in extraction agent purity detection module to avoid data deviation caused by reagent contamination.

Design of Detection Scheme in Petrochemical Scene

1. Laboratory precise analysis

For high-precision demand scenarios such as scientific research experiments and emergency accidents, the Hengmei HM-HY10 infrared spectrophotometer is used for laboratory testing:

• Sample pretreatment: Take 500 mL of water sample, add 50 mL of tetrachloroethylene for extraction, remove animal and vegetable oil interference by magnesium silicate adsorption, and then measure.

• Quality control: The accuracy is verified through blank tests (absorbance of tetrachloroethylene<0.03 AU) and standard oil samples (such as n-hexadecane and isooctane), and the recovery rate can reach 97.5% -102.3%.

2. Emergency detection and mobile applications

Equipped with Hengmei portable infrared oil analyzer to respond to sudden oil pollution incidents:

• Quick response: Single sample detection can be completed within 5 seconds, supporting extraction with various solvents such as n-hexane and petroleum ether, without the need for complex preprocessing.

• On site calibration: One click operation through Android touch screen, built-in GPS positioning and data export function, meeting the needs of environmental law enforcement.

Technological advantages and industry value

1.Compliance guarantee: Strictly following standards such as HJ637-2018, the test results can be directly used for environmental protection declaration and audit.

2.Economic benefits: Reduce fines caused by excessive emissions and extend the service life of equipment (such as avoiding boiler scaling).

3.Data driven decision-making: Optimizing production processes through long-term monitoring of data, such as adjusting the operating parameters of air flotation devices to improve oil removal efficiency.

With the penetration of Industry 4.0 technology, infrared spectrophotometers will further integrate AI algorithms to achieve automatic identification of oil components and traceability of pollution sources. Hengmei and other manufacturers are developing miniaturized sensors to reduce detection costs and assist small and medium-sized petrochemical enterprises in upgrading their environmental protection.

By virtue of its progressiveness technology and scene adaptability, Hengmei infrared spectrophotometer provides a complete oil detection solution from laboratory to site for the petrochemical industry. Through precise data support and intelligent management, enterprises can effectively balance production efficiency and environmental responsibility, and promote sustainable development of the industry.

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