Crude oil and tar water content measuring device by Karl Fischer coulometry method

Abstract

The invention relates to a crude oil and tar water content measuring device by a Karl Fischer coulometry method, and relates to an electronic chemical analysis instrument. The crude oil and tar water content measuring device consists of a nitrogen gas storage tank, a step motor, a needle valve, a mass flow meter, an electromagnetic valve, a metal bath gasification unit, a Karl coulometry method electrolytic tank and a control unit, wherein a valve rod of the needle value is in transmission connection with a power output shaft of the step motor; the nitrogen gas storage tank, the needle valve, the mass flow meter, the electromagnetic valve, the metal bath gasification unit and the Karl coulometry method electrolytic tank are sequentially connected through pipelines; the control unit is connected with the step motor, the mass flow meter, the electromagnetic valve, the metal bath gasification unit and the Karl coulometry method electrolytic tank through circuits. According to a method adopted by the device, samples are not directly injected into the electrolytic tank; the metal bath gasification unit is adopted for heating the samples; high-purity nitrogen gas is used for blowing moisture in the samples into the electrolytic tank; the defect of reagent failure due to oil film coating formed by impurities in crude oil or tar on electrolytic electrodes and measuring electrodes can be avoided; the reagent utilization rate is improved.

Description

technical field [0001] The invention relates to an electronic chemical analysis instrument, in particular to a Karl Fischer coulomb method for measuring water content in crude oil and tar, which is suitable for crude oil and tar. Background technique [0002] The traditional crude oil water content analyzer adopts the distillation method, which needs to distill, condense, recover and collect water from many samples to measure the water in crude oil or tar. The test process is rather cumbersome, and the measurement result is only a rough calculation because it is measured with a 5 ml graduated cylinder, so the result is not very accurate. Since the appearance of the Karl Fischer coulometric moisture analyzer, people have carried out moisture determination according to GB / T11146, the Karl Fischer method of crude oil moisture determination method. In this standard, crude oil or tar is directly injected into the electrolytic cell bottle. , so that the electrolyte and the sample...

AI Technical Summary

Problems solved by technology

The test process is relatively cumbersome, and the measurement result is only a rough calculation because it is measured with a 5ml graduated cylinder, so the result is not very accurate

Since the appearance of the Karl Fischer coulometric moisture analyzer, people have carried out moisture determination according to GB / T11146, the Karl Fischer method of crude oil moisture determination method. In this standard, crude oil or tar is directly injected into the electrolytic cell bottle. , so that the electrolyte and the sample participate in the reaction to calculate the water content, but due to the crude oil or tar impurities, the electrolytic electrode and the measuring electrode are surrounded by an oil film, which makes the reagent easily invalid

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