Extraction method and extraction agent for denitration procedure in H acid production process

An extraction agent and process technology, applied in the field of organic chemical industry, can solve the problems of low extraction rate, phase-entrained extraction agent regeneration cost, and difficult stratification, etc., and achieve high extraction rate, simple and easy extraction method, and easy stratification Effect

Active Publication Date: 2018-05-18
湖北丽康源化工有限公司
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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides an extraction method and an extractant for the denitrification process in the H-acid production process, wherein by fully combining the characteristics of the out-of-stock products in the out-of-stock process of the H-acid production process, the out-of-stock 2-Ethylhexyl Phosphate 2-Ethylhexyl Phosphate was used as co-solvent, with solvent and diluent, to extract the organic phase 8-nitro-

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  • Extraction method and extraction agent for denitration procedure in H acid production process
  • Extraction method and extraction agent for denitration procedure in H acid production process

Examples

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Example Embodiment

[0049] Example 1

[0050] The high-efficiency extractant is made up of ternary components of 1500ml trioctylamine, 4000ml sulfonated kerosene and 500ml 2-ethylhexyl phosphate 2-ethylhexyl ester. The mixing volume ratio is 1.5:4:0.5.

[0051] Using the above-mentioned high-efficiency extractant to extract the H acid denitrification product, the specific steps are:

[0052] 1) According to the existing H acid process sulfonation, continuous nitration and denitration, the denitration product obtained contains 8-nitro-1.3.6-naphthalenetrisulfonic acid and a large amount of inorganic acid, and the pH of the denitration product is 2.

[0053] 2). Transfer 12000 ml of the denitrified product of step 1) to the extraction vessel, then add the above-mentioned mixed high-efficiency extractant, start stirring, and stir for 10 minutes under the conditions of 30 rpm and 45°C.

[0054] 3). Let the mixture material obtained in step 2) stand for 40 minutes, the upper layer is the organic phase, the lowe...

Example Embodiment

[0067] Example 2

[0068] The high-efficiency extractant is mixed with ternary components of 1500ml trioctylamine, 3000ml sulfonated kerosene and 200ml 2-ethylhexyl phosphate 2-ethylhexyl ester, and the mixing volume ratio is 1.5:4:0.5.

[0069] Using the above-mentioned high-efficiency extractant to extract the H acid denitrification product, the specific steps are:

[0070] 1) According to the existing H acid process sulfonation, continuous nitration and denitration, the denitration product obtained contains 8-nitro-1.3.6-naphthalenetrisulfonic acid and a large amount of inorganic acid, and the pH of the denitration product is 2.

[0071] 2) Transfer 4700 ml of the denitrified product of step 1) into the extraction vessel, then add the above-mentioned mixed high-efficiency extractant, start stirring, and stir for 10 minutes at a speed of 30 rpm and a temperature of 45°C.

[0072] 3). Let the mixture material obtained in step 2) stand for 40 minutes, the upper layer is the organic phas...

Example Embodiment

[0076] Example 3

[0077] The high-efficiency extractant is made up of ternary components of 1500ml trioctylamine, 5000ml sulfonated kerosene and 800ml 2-ethylhexyl phosphate 2-ethylhexyl ester. The mixing volume ratio is 1.5:4:0.5.

[0078] Using the above-mentioned high-efficiency extractant to extract the H acid denitrification product, the specific steps are:

[0079] 1) According to the existing H acid process sulfonation, continuous nitration and denitration, the denitration product obtained contains 8-nitro-1.3.6-naphthalenetrisulfonic acid and a large amount of inorganic acid, and the pH of the denitration product is 2.5.

[0080] 2) Transfer 36500 ml of the denitrified product of step 1) into the extraction vessel, then add the above-mentioned mixed high-efficiency extractant, start stirring, and stir for 10 minutes under the conditions of 30 rpm and 45°C.

[0081] 3). Let the mixture material obtained in step 2) stand for 40 minutes, the upper layer is the organic phase, the l...

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Abstract

The invention relates to an extraction method and an extraction agent for a denitration procedure in an H acid production process, and belongs to the technical field of the organic chemical industry.The extraction method comprises the following steps: firstly, preparing the extraction agent which comprises a solvent, a diluting agent and a co-solvent, wherein the co-solvent is 2-ethylhexylphosphoric acid mono-2-ethylhexyl ester, the solvent is a tertiary amine type solvent, and the diluting agent is one or more of sulfonated kerosene, benzene and toluene; then, extracting denitration substances by adopting the extraction agent, and forming a complexation layer and an inorganic acid aqueous layer after extracting; and applying the inorganic acid aqueous layer to an H acid segregation procedure, performing back extraction on the complexation layer, adding a back extraction agent until the pH of an organic aqueous phase formed by back extraction is 7-9, forming trisodium salt from the denitration substances, standing the trisodium salt to be layered to obtain an organic layer, and applying a solvent layer. The extraction agent does not react with the denitration substances, so that the complexation effect is good, the layering is easy, and the loss of the extraction agent is greatly reduced; and by applying the extraction method and the extraction agent to H acid production, generation of a large amount of wastewater is avoided, a large amount of ammonia is saved, and thus the production cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of organic chemical industry, and more specifically relates to an extraction method and an extraction agent used in the denitrification process in the production process of H acid. Background technique [0002] H acid is an important intermediate in the chemical industry of naphthalene dyes, mainly used in the production of acidic, direct and reactive dyes, such as acid magenta 6B, acid scarlet G, acid black 10B, direct black, reactive brilliant red K-2BP, reactive violet K There are more than 90 kinds of dyes, such as -3R, reactive blue K-R, etc. These dyes are used for dyeing woolen and cotton fabrics. [0003] At present, the domestic traditional process produces 8-10 tons of T acid separation mother liquor per ton of H acid product, its COD is 50000mg / L, and thiamine is about 235g / L, which belongs to high COD and high salt content, and it is difficult to carry out conventional biochemical treatment. The...

Claims

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Application Information

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IPC IPC(8): B01D11/04
Inventor 魏铁明黄胜勇胡火炬
Owner 湖北丽康源化工有限公司
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