SU1404462A1 - Method of deactivating pyrophoric ferrous sulfides - Google Patents

Abstract

The invention relates to the method: bam deactivation of pyrophoric iron sulfide, which is formed in the apparatus. tanks and other equipments that work with sulfur oils and petroleum products. The invention can be used on objects of the oil, gas and oil refining industries. The purpose of the invention is to ensure the explosion and fire safety of the process and safe working conditions. The initial ferric sulfide is treated with an aqueous solution of ethylenediaminetetraacetic acid disodium salt (Trilon B) with a concentration of 1.00-1.50 wt.%. The method makes it possible to effectively deactivate pyrophoric iron sulfide with the exception of the use of an explosive, toxic deactivator. 1 tab. a t (L

Description

ABOUT)

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The invention relates to the prevention of fires and explosions associated with the spontaneous combustion of pyrophoric deposits of iron sulfides F, eS, FeSj, formed on the inner surfaces of equipment operating with sulfur oils, petroleum products and gases.

The purpose of the invention is to reduce the explosion hazard of the process and improve working conditions,

 The method is carried out by treating iron pyrophoric sulphides with fireproof, non-toxic, w / w ethylenediaminetetraacetic acid solutions of the disodium salt. V ((C, oH, 4) - trilon-B concentration G, 00-1.50 wt.%.

The method makes it possible to effectively deactivate pyrophoric iron sulfide, at the same time exclude the use of an explosive, toxic deactivator and thereby creates safe working conditions.

By passing (reacting) hydrogen sulfide through iron oxide for 20-30 minutes, pyrophoric-jHb iron sulfide is obtained. After that, 5 g of the obtained pyrophoric iron sulfide is taken and its activity is determined. To do this, in a special installation, an air stream is passed through pyrophoric iron sulfide for 10 minutes at a rate of 1 l / min and measured from the reaction temperature

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The sharp temperature trapping and its magnitude characterize the activity of digital iron sulfide. After the activity of pyrophoric iron sulfide has been established, it is treated with various aqueous solutions of Trilon B and the active activity is determined anew.

STABLE

For testing, pyrophoric iron sulfide with activity is used: maxi:

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five

five

The minimum self-heating temperature is 200 ° C; the maximum temperature rise time is 8s.

Example: 5 g of active iron sulfide are taken, 50 cm of an aqueous solution of Trilon-B is added to it and left for 3 hours, periodically agitated, then the aqueous solution of Trilon-B is drained and for 45-60 minutes under a stream of thermal nitrogen (70-80 ° C) a supat sample, and then its activity is determined. To do this, an air flow is passed through the sample at a rate of 1 l / min and the temperature of the oxidation reaction is measured.

The results of testing samples after treatment with aqueous solutions of Trilon-B with various concentrations are given in the table.

 From the table it is clear that positive. Aqueous solutions of Trilon-B have concentrations of 1.00 - 2.00 wt.% have deactivating properties.

Increasing the concentration of tripone-B more than 1.00 - 1.5 wt.% From the economic point of view is impractical.

Thus, using aqueous solutions of Trilon-B, effective deactivation of pyrophoric iron sulfides, simplification of the process and creation of safe working conditions are achieved.

Claims (1)

Formula izob p shadow A method of deactivating pyrophoric iron sulphides by treating with a deactivating solution, characterized in that, in order to reduce the explosion and fire hazard of the process and improve working conditions, the initial sulphide is treated with an aqueous solution of methylene diamine tetraacetic acid disodium salt with a concentration of 1.00-1.50% by weight . Air exposure time to reach maximum temperature value, min The concentration of the aqueous solution of Trilon-B, wt.% 3 five ten ten ten 135 75 35 25 25