Chemical acid slag neutralization method

A treatment method and acid slag technology, applied in chemical instruments and methods, chemical/physical processes, chemical/physical/physical chemical processes, etc., can solve the problem of affecting the neutralization effect of acid slag and Ca, increasing operating costs, and the number of product stacks It can't achieve neutrality and other problems in a month, and achieve the effect of obvious and rapid neutralization effect, simple and easy method, and low processing cost

Active Publication Date: 2018-08-17
LANZHOU KANGSHUN PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, when calcium hydroxide (slaked lime) is used to directly neutralize chemical acid slag, especially chemical acid slag containing sulfuric acid, not only the reaction is extremely violent and a large amount of reaction heat is released, but also due to the slightly soluble substances generated by the reaction (such as CaSO 4 ) covered the surface of slaked lime particles, preventing further reaction
This not only affects the acid slag and Ca(OH) 2 The neutralization effect will waste resources and increase operating costs
In the actual production and operation, even the reaction products cannot reach neutrality after being piled up for several months, which has seriously affected the safety of landfill.

Method used

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  • Chemical acid slag neutralization method

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Effect test

Embodiment 1

[0026] Alkylation acid residue 100g in a refinery, Ca(OH) 2 (slaked lime) 90g, loess 150g, water 100g. Dilute the alkylated acid slag with water first, and the Ca(OH) 2 (slaked lime) and loess evenly mixed into lime soil. Slowly add the mixed lime soil into the alkylated acid slag solution while stirring, react for 30 minutes, and age for 3 hours after the reaction, the pH value of the reaction product is 7.17. The neutralized product after aging can be made into unfired brick according to the method of CN1955141A.

Embodiment 2

[0030] Chemical waste water, composed of: 90g of mixed aqueous solution of hydrochloric acid and sulfuric acid, containing 4.6% (mass) of HCl, H 2 SO 4 30% (mass), water content 62.1% (mass). Take Ca(OH) 2 (slaked lime) 36g, loess 63g, Ca(OH) 2 (slaked lime) is evenly mixed with loess to form lime soil. Slowly add mixed lime soil into the mixed acid solution while stirring, stir and react for 30 minutes, and age for 360 minutes after the reaction, the pH value of the reaction product is 7.11. According to the method of CN103172334 A, the neutralized product after aging can be made into unfired bricks.

Embodiment 3

[0032] 26 tons of alkylation acid slag in a factory, Ca(OH) 2 (slaked lime) 26 tons, loess 40 tons, water 26 tons. Dissolve the alkylated acid residue in water and dilute the Ca(OH) 2(slaked lime) and loess are mixed evenly to form lime soil. Under the condition of stirring, lime soil was slowly added to the alkylated acid slag solution to react for 40 minutes, and aged for 2 days after the reaction, and the pH value of the reaction product was 7.85. According to the method of CN102659376 A, the neutralized product after aging can be made into unfired bricks.

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Abstract

The invention relates to a chemical acid slag neutralization method, in particular to a treatment method of alkylated acid slag discharged by an alkylating production device. When acid liquid is neutralized by slaked lime, soil is introduced to uniformly mix with the slaked lime as dust; under the stirring condition, the dust is reacted with chemical acid slag; and a reacted product is aged untila pH value reaches 7-8. The neutralized product after aging can be directly filled or used as preparation raw materials of baking-free bricks. The chemical acid slag neutralization method is particular suitable for treatment of the alkylated acid slag discharged by the alkylating production device, and is easy to obtain raw materials, simple and feasible, obvious and quick in neutralization effect, low in treatment cost and incapable of causing secondary pollution.

Description

technical field [0001] The invention relates to a method for neutralizing chemical acid slag, in particular to a method for treating alkylated acid slag discharged from an alkylation production device. Background technique [0002] The current gasoline production is developing towards low-lead and lead-free, and alkylation is a common traditional process for producing high-octane gasoline. This process method is that the gaseous olefins and isobutane produced in the secondary processing of the refinery undergo an alkylation reaction under the catalysis of 98% concentrated sulfuric acid to generate industrial isobutane for blending high-grade gasoline. During the alkylation reaction process, the water, sulfur, nitrogen compounds and side reaction products in the raw materials continuously enter the acid phase, so that the concentration of sulfuric acid gradually decreases, and its catalytic effect gradually weakens. When the acid concentration drops to 80% to 90%, That is, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B01J19/00
CPCB01J19/00B09B3/00
Inventor 谢肇新刘保强秦进林刘英包天鹤李信昌董晓博
Owner LANZHOU KANGSHUN PETROCHEM
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