85-49-4Relevant articles and documents
Method adopting clean process for preparing H-acid
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Paragraph 0058; 0059; 0060; 0061; 0062, (2016/10/10)
The invention discloses a method adopting a clean process for preparing H-acid. The method comprises the following process: step (10), carrying out extraction treatment on denitrated matter to obtain dilute sulphuric acid and an extracted mixture, and carrying out re-extraction on the extracted mixture to obtain a nitro-T-acid solution; step (20), carrying out reduction treatment on the nitro-T-acid solution obtained in the step (10) to obtain an amino-T-acid solution; step (30), respectively carrying out concentration treatment on the amino-T-acid solution obtained in the step (20) and caustic soda liquid to obtain concentrated amino-T-acid solution and caustic soda liquid; step (40), carrying out alkali fusion treatment on the concentrated amino-T-acid solution and caustic soda liquid obtained in the step (30), and performing attenuation treatment to obtain attenuated alkali fusion matter; step (50), carrying out separation and filtration treatment on the attenuated alkali fusion matter obtained in the step (40) to obtain the H-acid. The preparation method disclosed by the invention adopts the clean process for preparing the H-acid, the production efficiency is high, the materials are saved, and the economic cost is reduced.
Device for preparing H-acid
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Paragraph 0025; 0026, (2016/10/27)
The invention discloses a device for preparing H-acid, comprising a sulfonating device, a nitrating device, a denitration device, an extraction device, a reduction device, a concentration device, a dilution device, a separation and filter device and a drying device. An outlet of the sulfonating device is connected with an inlet of the nitrating device, an outlet of the nitrating device is connected with an inlet of the denitration device, an outlet of the denitration device is connected with an inlet of the extraction device, a first outlet of the extraction device is connected with an inlet of the reduction device, an outlet of the reduction device is connected with an inlet of the concentration device, an outlet of the concentration device is connected with an inlet of the dilution device, an outlet of the dilution device is connected with a first inlet of the separation and filter device, an outlet of the separation and filter device is connected with an inlet of the drying device, and a second outlet of the extraction device is connected with a second inlet of the separation and filter device. The device for preparing H-acid produces H-acid with a continuous production method, has the high production efficiency, saves materials and reduces economic cost.
Method for preparing energy-efficient H-acid
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Paragraph 0042; 0043; 0044; 0045; 0046, (2016/10/08)
The invention discloses a method for preparing energy-efficient H-acid. The method comprises the steps of conducting sulfonation on liquid naphthalene to obtain a sulfonated substance, conducting nitration on the sulfonated substance to obtain a nitrated substance, conducting denitration on the nitrated substance to obtain a denitrated substance, conducting extraction on the denitrated substance to obtain dilute sulphuric acid and an extraction mixture, conducting reextraction on the extraction mixture to obtain nitro T-acid solution, conducting reduction on the nitro T-acid solution to obtain amino T-acid solution, conducting concentration on the amino T-acid solution and caustic soda liquid to obtain concentrated amino T-acid solution and caustic soda, conducting alkali fusion and dilution on the concentrated amino T-acid solution and caustic soda to obtain a diluted alkali fusion substance, conducting separation and filtration on the diluted alkali fusion substance to obtain H-acid filter cakes, and conducting drying on the H-acid filter cakes to obtain H-acid. By the adoption of the method, continuous production of H-acid can be achieved, and economic cost is low.
On the positional reactivity order in the sulfuric acid sulfonation of the two naphthalenesulfonic acids
Wit, Peter De,Cerfontain, Hans
, p. 1453 - 1455 (2007/10/02)
The sulfonation in 98.5percent H2SO4 at 25.0 deg C of naphthalene-1-sulfonic acid yields 58percent 1,5-, 32percent 1,6-, and 10percent 1,7-disulfonic acids and that of the 2-sulfonic acid 4percent 1,3-, 74percent 1,6-, 18percent 1,7-, and 4percent 2,6- + 2,7-disulfonic acids.Further sulfonation of the latter disulfonic acid mixture in 105.2percent H2SO4 at 25.0 deg C yields 78percent 1,3,6- and 12percent 1,3,5- + 1,3,7-trisulfonic acids.Reaction of naphthalene-1,5-disulfonic acid with 105.2percent H2SO4 at 25 deg C yields 5-sulfonaphthalene-1-sulfonic anhydride.Partial rate factors for the sulfonation of naphthalene-1- and -2-sulfonate in highly concentrated aqueous sulfuric acid (where the sulfonating entity is H2S2O7) are reported.They are discussed in terms of the difference in the reactivity of the α- and β-positions of the naphthalene skeleton and the electronic and steric effects of the sulfonate substituent already present.
