The crude oil organic chlorine content analyzer is mainly used to detect trace chlorine content in crude oil and petrochemical products. Its core principle is to analyze the chloride ions produced by the decomposition of samples at high temperatures through microcoulometry, and calculate the total chlorine content by combining electrolytic titration technology. It has a high degree of automation and can process liquid, solid, and gas samples. Its core function is to avoid the corrosion risk of organic chlorine on crude oil processing equipment (such as catalytic cracking units and heat exchangers), while meeting the limit requirements of environmental regulations for chlorine content in crude oil and finished oil.
Detection principle: By high-temperature cracking of the sample, organic chlorine is converted into chloride, which reacts with silver ions in the titration cell. The consumption of electricity is calculated by Faraday's law to determine the chlorine content.
Testing process:
Sample pretreatment: dehydration (moisture content ≤ 5%), distillation, alkaline washing (1mol/L KOH solution), and water washing to remove interfering substances.
Instrument parameter settings: vaporization section at 650 ℃, combustion section at 850 ℃, stable section at 750 ℃, with bias voltage controlled between 240-260V.
Calibration of standard samples: Use 10 μ g/mL and 50 μ g/mL organic chlorine standard samples, repeat the measurement 3 times, and control the conversion rate at 80-120%.
Sample determination: Adjust the injection volume according to the chlorine content (blank titration needle is required for<5 μ g/g, 5.0 μ L is injected for>25 μ g/g), repeat 2-3 times, and take the average value.
Main application scenarios
Crude oil extraction process: Check the organic chlorine content of crude oil at the wellhead and in the gathering and transportation pipeline to determine whether the chlorine exceeds the standard due to pollution from drilling fluid (chlorine containing additives);
Crude oil processing stage: Quality inspection of crude oil entering the refinery to avoid high chlorine crude oil entering the catalytic cracking unit (organic chlorine generates HCl at high temperatures, which corrodes the inner walls of equipment);
Environmental monitoring process: detecting leakage pollution during crude oil storage and transportation, or residual organic chlorine in finished oil products (such as gasoline and diesel) (to avoid the generation of toxic substances such as dioxins during combustion).