Method for determination of hydrogen sulfide content in fuel oil

 

(57) Abstract:

The invention relates to methods of analytical control and may find application in the oil and gas industry for the quantitative determination of hydrogen sulfide content in fuel oil. For implementing the method of the fuel oil containing hydrogen sulfide diluted with an organic solvent of 1:1 and stir until smooth. The resulting mass is hydrogen displace inert gas in the adsorption solution within 1-2 hours After the complete removal of hydrogen sulfide resulting solution is analyzed by known methods and determine the quantitative content of hydrogen sulfide. The method provides improved quality determination of hydrogen sulfide in fuel oil. 1 C.p. f-crystals, 1 Il.

The invention relates to methods of analytical control of petroleum products and may find application in the oil and gas industry.

There is a method of qualitative detection of hydrogen sulfide in fuel oil (GOST 10585-75 P. 4.2. "The oil. Technical specifications"). The method consists in the fact that in a separating funnel with a capacity of 100 cm3pour 10 cm3fuel oil, 10 cm3caustic soda and thoroughly shake the contents howl acid, then the tube is heated to 25oC in a water bath with constant shaking. Simultaneously with the start of heating in the upper part of the tube when wet place lead indicator paper, the color changes to dark brown indicates the presence of hydrogen sulfide. The following equations explain the chemistry of the method.

H2S + 2NaOH = Na2S + 2H2O

Na2S + 2HCl = H2S + 2NaCl

H2S + Pb(CH3COO)2= PbS + SN3COO

The disadvantage of this method is the impossibility of quantitative determination of hydrogen sulfide.

There is a method of determining the content of hydrogen sulfide in petroleum products and crude oil (Fisher B. M. "Analysis of oil and oil products." - M.: Publishing house "Costoptimized", 1962, pp. 428 - 431) method of extraction in a solution of cadmium chloride, which consists in the fact that 500 cm3the test oil is loaded into a separating funnel and shaken for 10 min with 100 cm3slobodkina solution of cadmium chloride. The reaction proceeds according to the following scheme:

CdCl2+ H2S = CdS + HCl

The mixture is then defend and poured the water layer. Further quantitative detection method can be any of the known (itemsets the need for filtration of the extract, resulting in the potential loss on the filter connection CdS.

The aim of the present invention is to improve the quality determination of hydrogen sulfide content in fuel oil.

This objective is achieved in that for reducing the density of oil in it add an organic solvent and stirred to obtain a homogeneous mass. Then, with the aim of ousting the absorption of hydrogen sulfide in solution, are blowing the oil with an inert gas not containing hydrogen sulfide. Blowing conduct not less than one hour. Followed by a quantitative measurement of one of the known methods.

The drawing shows a diagram of the laboratory setup, full implementation of the proposed method.

The installation includes a cylindrical glass vessel with the rack 1, the tube with the cut and bubbling fluidised bed device 2, the gas cylinder 3, Barbary 4.

An example of a specific implementation.

Take a sample of fuel oil 20-50 g and diluted 1:1 with an organic solvent that does not contain hydrogen sulfide (e.g., hexane), to reduce the density of the oil, stir until smooth and pour into a glass vessel 1 with a bubbling fluidised bed device 2 and perform the purge gas from belopolskaya cylindrical glass vessel 1 with a capacity of up to 500 cm3with the tube on the rack 2. On the tube reinforced with two tubes: input in the form of a bubbler, ending with a perforated cylinder, and the outlet, and a discharge gas in the subsequently connected bubblers. In each bubbler fill 50 - 100 cm330%-aqueous solution of cadmium chloride. Purge the sample gas are within 1 to 2 h at a speed of 60 - 100 cm3/min for the complete removal of hydrogen sulfide from oil. After purging the solution of cadmium chloride from each bubbler is analyzed by the method iodometric titration or other known method for hydrogen sulfide.

This method can be used for analytical monitoring of hydrogen sulfide content in the fuel oil, in order to improve technical and environmental performance of oil on the oil and gas processing plants, with the number of products produced oil. The method is simple in hardware implementation and high accuracy.

1. Method for determination of hydrogen sulfide content in fuel oil, including quantitative determination of hydrogen sulfide, characterized in that the oil is first diluted with an organic solvent in a ratio of 1 : 1, then replacing hydrogen with an inert gas in the absorbing solution, the settlement of the oil with an inert gas are not less than 1 h

2. The method according to p. 1, characterized in that use an organic solvent that does not contain hydrogen sulfide, for example hexane.

 

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