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 h2. The method according to p. 1, characterized in that use an organic solvent that does not contain hydrogen sulfide, for example hexane.
FIELD: analytical methods in petroleum industry.
SUBSTANCE: invention relates to analytical checking of crude oil, petroleum derivatives, and gas condensate quality. 2 to 5g sample is thermostatically controlled at 50-70°C, while simultaneously hydrogen sulfide and light mercaptans are for 2-5 min displaced by inert gas or air into in series arranged absorption solutions, namely sodium carbonate solution for determining hydrogen sulfide and sodium hydroxide solution for determining light mercaptans. After complete withdrawal of hydrogen sulfide and light mercaptans, their quantitative content is determined by means of iodometric titration method.
EFFECT: extended range of analyzed products, increased determination accuracy, shortened analytical procedure, and enabled carrying out analyses not only in stationary laboratory without deviation from standardized procedures.
1 dwg, 1 tbl
FIELD: gas treatment.
SUBSTANCE: invention relates to purification of hydrogen sulfide produced by hydrogen-liquid sulfur reaction. Hydrogen sulfide is passed through filter containing a solid material selected from porous granules of activated carbon, alumina, and silica showing molecular sieve properties.
EFFECT: prevented clogging of pipelines due to removal of sulfanes and/or unreacted sulfur.
4 cl, 3 tbl, 3 ex
SUBSTANCE: sulphanes from sour gas produced during manufacturing of hydrogene sulfide with Н2S content over 80 vol.% and Н2Sn (where n is a number from 2 to 8) polysulphanes content of 100 to 2000 vol. ppm, mainly over 400 to 1500 vol. ppm, are removed by purging sour gas through the wash system. Sour gas is contacted with water and/or methanol, which results in pure gas.
EFFECT: invention provides for increase in gas purification degree as regards to polysulphanes.
9 cl, 5 ex
SUBSTANCE: invention relates to a method for continuous production of methylmercaptan from hydrogen sulphide and methanol while directly obtaining hydrogen sulphide at the same time, for which the reaction mixture coming out of a hydrogen sulphide synthesis reactor under pressure is mixed with methanol and the obtained mixture is fed under pressure into a methylmercaptan synthesis reactor with creation of pressure difference between reactors used for both synthesis processes, under the effect of which the stream of the hydrogen sulphide and methanol mixture is forcibly moved towards the methylmercaptan synthesis reactor.
EFFECT: improved method for producing methylmercaptan which reduces power consumption and increases cost effectiveness of the process.
18 cl, 1 ex