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

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...

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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-1.3.6-naphthalene tri Sulphonic acid, so that it can be separated from the inorganic acid dilute sulfuric acid in the denitrification product, provides a practical method for the clean production of H acid and the recycling of resources, thereby solving the problem of low extraction rate of the existing H acid denitrification process extraction technology, Technical problems such as difficult separation after extraction, phase entrainment phenomenon and high cost of extraction agent recycling

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