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Inorganic ferrous sulfide passivation abluent

A technology of ferrous sulfide and cleaning agent, applied in inorganic non-surface active cleaning compositions, petroleum industry, corrosion/fouling inhibition of processing equipment, etc., can solve problems such as explosion, non-compliance of cleaning liquid discharge environmental protection, spontaneous combustion, etc.

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the equipment is shut down and opened, FeS can undergo a strong oxidation-reduction reaction and release a lot of heat when it contacts with oxygen in the air. After the heat accumulates, it will cause spontaneous combustion, causing fire and explosion accidents
At present, the commonly used FeS passivation cleaning agents are mainly organic chelating type, acid type, and oxidizing agent (mainly potassium permanganate) type. Secondary pollution and other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The mass percent of each component of the inorganic type ferrous sulfide passivation cleaning agent is: sodium pyrosulfate 5%, low alkali value type calcium hypochlorite with a pH value of 12 35%, trisodium phosphate 10%, sodium bicarbonate 0.1% and water 49.9%.

[0011] Carry out FeS passivation and cleaning to the decompression column (C-4) of the third atmospheric and decompression device of the refinery with the inorganic type ferrous sulfide cleaning agent of the above configuration (add 10 times the weight of water to dilute it during use), and the sulfur-containing Sewage stripper (C-6), sulfur-containing sewage tank (D25 / 1, 2) for sewage deH 2 S, NH 3 -N treatment and FeS passivation treatment, this passivation treatment took 10 days in total, using 25 tons of inorganic ferrous sulfide passivation cleaning agent configured above (original agent, excluding dilution water), of which the third The decompression tower (C-4) of the atmospheric and vacuum device use...

Embodiment 2

[0013] The mass percentages of each component of the inorganic ferrous sulfide passivation cleaning agent are: sodium pyrosulfate 15%, low alkali value type sodium hypochlorite 15% with a pH value of 12, trisodium phosphate 0.5%, sodium bicarbonate 5% and Water 64.5%.

[0014] Use the inorganic type ferrous sulfide cleaning agent of the above configuration on the refinery reforming unit pre-fractionation tower (T2101) (including reflux tank and tower top pipeline, water cooling, air cooling), evaporation tower (T2102) (including reflux tank and tower top Pipeline, heat exchanger) passivation treatment of ferrous sulfide. This passivation treatment took 2 days in total. The pre-fractionation tower (T2101) of the reforming unit used 2.5 tons of the above-mentioned inorganic ferrous sulfide passivation cleaning agent, and the evaporation tower (T2102) used 2 tons. The treated equipment does not appear spontaneous combustion, eliminating the H 2 S and RSH meet the entry conditio...

Embodiment 3

[0016] The mass percent of each component of the inorganic ferrous sulfide passivation cleaning agent is: 10% of sodium pyrosulfate, 25% of low alkali value type calcium hypochlorite with a pH value of 13, 5% of trisodium phosphate, sodium bicarbonate 5% and water 55%.

[0017] Use the inorganic ferrous sulfide cleaning agent configured above to passivate FeS on the high-pressure separator (V3005) and low-pressure separator (V3006) of the hydrogenation unit. The passivation treatment took 2 days in total. Inorganic ferrous sulfide passivation cleaning agent 2 tons. The treated equipment does not appear spontaneous combustion, eliminating the H 2 S and RSH meet the entry conditions, and the COD of the discharged cleaning agent waste liquid is less than 1000mg / L, which meets the sewage standard and is allowed to be discharged into the sewage treatment plant.

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Abstract

The invention relates to an inorganic ferrous sulfide passivation abluent which is characterized in that: the inorganic ferrous sulfide passivation abluent is composed of components of, by mass: 5 to 15% of sodium pyrosulfate, 15 to 35% of hypochlorite, 0.5 to 10% of trisodium phosphate, 0.1 to 5% of sodium bicarbonate, and 35 to 79% of water. The pH value of the product is controlled at 11 to 12. With the inorganic ferrous sulfide passivator, FeS and oil stains on refining equipments can be effectively and quickly removed; and gases such as H2S, micro-molecular sulfur and alcohol in equipments such as towers and containers can be absorbed. Indexes such as COD of the abluent satisfy an oil refinery sewage discharging standard. With the inorganic ferrous sulfide passivation abluent, environment protection problems such as a FeS passivation problem and an abluent waste liquid discharging problem can be well solved.

Description

technical field [0001] The invention relates to an inorganic ferrous sulfide passivation cleaning agent. Background technique [0002] When a refinery refines crude oil with high sulfur content, the sulfide in crude oil will produce a large amount of FeS under high temperature conditions, especially under the action of catalyst, and FeS is adsorbed on the equipment and pipelines of the refinery. When the equipment is shut down and the equipment is turned on, the contact between FeS and the oxygen in the air can produce a strong redox reaction and release a lot of heat. After the heat accumulates, it will cause spontaneous combustion, causing fire and explosion accidents. At present, the commonly used FeS passivation cleaning agents are mainly organic chelating type, acid type, and oxidizing agent (mainly potassium permanganate) type. Secondary pollution and other issues. Contents of the invention [0003] According to the deficiencies in the prior art above, the technica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C11D7/10C10G75/04
Inventor 芦清新王伟薛光亭胡洋
Owner CHINA PETROLEUM & CHEM CORP
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