Detection method of organic chlorine content in crude oil containing free water
A detection method and organochlorine technology, which can be used in measurement devices, hydrocarbon oil dehydration, and electrochemical variables of materials, etc., can solve the problems of inability to direct distillation, difficulty in dehydration, and inapplicability, and achieve easy large-scale promotion, simple equipment, and easy operation. simple effect
Active Publication Date: 2021-01-01
CHINA PETROLEUM & CHEM CORP +1
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[0002] At present, the domestic detection method of organic chlorine content in crude oil is GB / T 18612-2011 "Determination of organic chlorine content in crude oil microcoulomb method", which is determined by measuring the organic chlorine content in distillate oil before 204 °C in crude oil. To determine the organic chlorine content in crude oil, this method is suitable for the determination of dehydrated purified crude oil, but the wellhead crude oil containing free water cannot be directly distilled because of its high water content and difficult dehydration, so GB / T 18612 is not suitable for Detection of Organochlorine Content in Free Water Crude Oil
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Embodiment 1
[0031] Example 1 Detection of Organochlorine Content in Crude Oil Containing Free Water
[0032] Proceed as follows:
[0033] (1) Put the free water-containing crude oil to be tested in a constant temperature water bath at 60°C to 80°C for 30 minutes to make the oil and water initially separate;
[0034] (2) Take out the above-mentioned upper layer crude oil containing emulsified water, and measure its viscosity at 60° C.;
[0035] (3) According to the above measurement results, when the viscosity is less than 300mPa.s, use an electric dehydrator to dehydrate in a closed manner at 60°C for 2h, then obtain the fraction before 320°C by distillation, and use the microcoulomb method to measure the organic chlorine content;
[0036] (4) According to the measurement results of the above step (2), when the viscosity is greater than 300mPa.s, add 120# solvent oil (the mass ratio of crude oil to solvent oil is 5:1) to the crude oil, and remove it by distillation and reflux. Moisture;...
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Abstract
The invention discloses a method of detecting the content of organic chlorine in crude oil containing free water. The detection method comprises the following steps: primarily separating oil and water, measuring the viscosity at a temperature of 60 DEG C; when the viscosity is less than 300 mPa.s, carrying out dehydration in an enclosed space at a temperature of 60 DEG C, measuring the organic chlorine content of crude oil by a micro-coulometry method; when the viscosity is greater than 300 mPa.s, adding No.120 solvent oil into crude oil, removing water by a distillation and reflux mode; reading the volume of separated water; adding distilled No.120 solvent oil into crude oil again, putting crude oil in a distillation instrument, measuring the organic chlorine content of the crude oil by amicro-coulometry method; recording related data, and substituting the data into a formula to carry out calculation. Crude oil containing free water is divided into low density and low viscosity crudeoil and high density and high viscosity crude oil based on the viscosity and density; different dehydration and measuring modes are adopted to solve the difficulty in measuring the content of organicchlorine in crude oil containing free water; when the standard content of organic chlorine is more than 3 [mu]g / g, the detection credibility is high, and the relative error is within 10%.
Description
technical field [0001] The invention relates to a method for detecting organic chlorine content in crude oil containing free water. Background technique [0002] At present, the domestic detection method of organic chlorine content in crude oil is GB / T 18612-2011 "Determination of organic chlorine content in crude oil microcoulometry method". Determine the organic chlorine content in crude oil. This method is suitable for the determination of dehydrated purified crude oil. However, wellhead crude oil containing free water cannot be directly distilled because of its high water content and difficulty in dehydration. As a result, GB / T 18612 is not suitable for Detection of organic chlorine content in free water crude oil. In order to strengthen the source control of organic chlorine in crude oil of oilfield enterprises and trace the source of organic chlorine pollution, it is necessary to establish a method for the determination of organic chlorine content in crude oil contain...
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IPC IPC(8): G01N27/42C10G33/02C10G7/04
CPCC10G7/04C10G33/02G01N27/423
Inventor 张志振周海刚唐永安杜灿敏徐英彪何留王玉鹏刘红霞董学建张娜
Owner CHINA PETROLEUM & CHEM CORP
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