METHOD FOR DETERMINING THE CONTENT OF SULFIDE AND POLYSULFIDE COMPOUNDS IN SEDIMENTS IN OILFIELD AND OIL REFINING EQUIPMENT Russian patent published in 2022 - IPC G01N31/16 G01N33/00 

FIELD: oil refining industry.

SUBSTANCE: invention relates to methods for determining the content of sulfide and polysulfide sulfur compounds. A method for determining the content of sulfide and polysulfide sulfur compounds in sediments in oilfield and oil refining equipment is described, according to which a sediment sample is mixed directly at the sampling site with a 5-8% solution of ascorbic acid at the rate of 1-2 ml of acid per 5 g of sample, the sample prepared by this method is treated in a nitrogen atmosphere with a 20% solution of hydrochloric acid at S:L=(1:10-25) for 60-70 minutes during boiling with distillation of the released hydrogen sulfide H₂S and calculation of its total amount according to the results of iodometric titration, after that, the specified sample is additionally treated with a 9% solution of nitric acid (T: W = 1:50) with the transfer of polysulfide ions present in the sample to the sulfate form SO₄^2- and its content in the sample is determined by one of the known methods, after which the content of polysulfide ions S_n^2- is found according to the formula (2): , where m_sam g is the weight of the sample before antioxidant treatment, g, S_n^2- is the number of polysulfide ions, %, C(SO₄^2-) is the concentration of sulfate ion, g/l, 0.33 is the mass fraction of sulfur in SO₄^2-.

EFFECT: improvement in the quality of monitoring the condition of oilfield and oil refining equipment.

2 cl, 1 dwg, 2 ex