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How Does Fast Scarlet G Base Work?

28 Apr.,2025

Azoene Fast Scarlet GC Base | Drug Information, Uses, Side Effects ...

5-Nitro-ortho-toluidine was identified as a product of the microbial transformation by Mucrosporium sp. of 2,4-dinitrotoluene, a compound common in water discharges and effluents from ammunition plants, ammunition loading facilities and sites for the destruction of stockpiled weapons ... . 5-Nitro-ortho-toluidine was identified as an intermediate in the anaerobic biotransformation of 2,4-dinitrotoluene added to a sample of municipal activated sludge ... . 5-Nitro-ortho-toluidine is formed enzymatically from 2,4-dinitrotoluene by liver and lung microsomal fractions from mice ... by liver microsomal and cytosolic fractions from rats ... and by intestinal microorganisms from rats and mice ... . 5-Nitro-ortho-toluidine and its N-acetyl derivative were identified as minor metabolites of 2,4-(14)C-dinitrotoluene when this compound was administered orally to male and female Fischer 344 rats at doses of 35, 63 or 100 mg/kg bw ... . Human intestinal microflora catalyse the reductive metabolism of 2,4-dinitrotoluene to 5-nitro-ortho-toluidine and 4-amino-2-nitrotoluene via nitroso intermediates ... .

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IARC. Monographs on the Evaluation of the Carcinogenic Risk of Chemicals to Humans. Geneva: World Health Organization, International Agency for Research on Cancer, -PRESENT. (Multivolume work). Available at: https://monographs.iarc.fr/ENG/Classification/index.php, p. 48:171 ()

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Preparation method for byproduct scarlet base RC of red base B

CNB - Preparation method for byproduct scarlet base RC of red base B - Google Patents

Preparation method for byproduct scarlet base RC of red base B Download PDF

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Publication number: CNB
Authority: CN; China
Prior art keywords: water; liquid phase; base; reaction; preparation
Prior art date: -07-29
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Expired - Fee Related

Application number

CN.7A

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Chinese (zh)

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CNA (en

Inventor

严传军

岳凤斌

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JIANGSU LIDANING CHEMICAL CO Ltd

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JIANGSU LIDANING CHEMICAL CO Ltd

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-07-29

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-07-29

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-05-28

-07-29 Application filed by JIANGSU LIDANING CHEMICAL CO Ltd filed Critical JIANGSU LIDANING CHEMICAL CO Ltd

-07-29 Priority to CN.7A priority Critical patent/CNB/en

-02-08 Publication of CNA publication Critical patent/CNA/en

-05-28 Application granted granted Critical

-05-28 Publication of CNB publication Critical patent/CNB/en

Status Expired - Fee Related legal-status Critical Current

-07-29 Anticipated expiration legal-status Critical

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Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

The invention discloses a preparation method for a byproduct scarlet base RC of a red base B, which belongs to the technical field of chemical industry and comprises the following steps: 1. nitration reaction: putting o-methoxy acetoacetanline and solvent dichloromethane into a reactor, and carrying out the nitration reaction under the conditions of stirring and reflux, wherein the nitration temperature is 40-42 DEG C, and the nitration time is 40-70 minutes. 2. hydrolysis reaction: distilling to recover the dichloromethane, and then carrying out hydrolysis to remove the reaction of acetyl. 3. acidification separation: after the hydrolysis is ended, carrying out extraction filtration to obtain a liquid phase a for later use; washing a filter cake by using water to be neutral, draining, and then, putting into the reactor; adding water and concentrated sulfuric acid; then, carrying out the extraction filtration to obtain a liquid phase b; slowly adding the liquid phase a to the liquid phase b under stirring; and adding the water and the concentrated sulfuric acid to carry out the acidification separation again. 4. refined salting out: adding industrial refined salt to a filtrate obtained after the acidification separation is ended in the reactor to carry out the salting out, the extraction filtration and drying to obtain the byproduct scarlet base RC. The preparation method for the byproduct scarlet base RC of the red base B is simple in operation and mild in reaction, is mainly used for dyeing and printing cotton fabrics, can also be used for dyeing viscose fibers, silk, acetate fibers and acrylic fabrics, and can also be used as a dye and an organic pigment midbody.

Description

The preparation method of a kind of Fast Red B base by-product Fast Scarlet G RC Background technology Fast Scarlet G RC, chemical name: 2-methoxyl group-5-N-methyl-p-nitroaniline hydrochloride; Its molecular formula is C 7h 9o 3n 2cl, Its structural formula is as follows: Fast Scarlet G RC be grey to beige powder, be mainly used in dyeing and the stamp of cotton fabric, also can be used for the dyeing of viscose fiber, silk, cellulose acetate and acrylic fabric, also can be used as dyestuff and pigment dyestuff intermediate. The production technique of domestic production Fast Red B base by-product Fast Scarlet G RC all adopts the method that the liquid phase that separates generation is saltoutd with industrial purified salt at present, do not pass through refining filtering, the Fast Scarlet G RC purity low (99.12%) obtaining, for the product light fastness poor (95 points) that dyes and obtain, fugitive color; Salt consumption high (approximately 5 tons of 1 ton of Fast Scarlet G RC work consuming industry purified salts of every production); Yield low (1 ton of Fast Red B base of every production approximately produces 172kg Fast Scarlet G RC); Wastewater discharge is large. Summary of the invention The technical problem to be solved in the present invention is the preparation method who has proposed a kind of Fast Red B base by-product Fast Scarlet G RC: mainly will in Fast Red B base production process, be hydrolyzed excessive alkali; separate the liquid phase (2-methoxyl group-5-nitracetanilide) producing in order to neutralization; be hydrolyzed and remove the reaction of ethanoyl, obtain by product 2-methoxyl group-5-N-methyl-p-nitroaniline.And then the 2-methoxyl group-5-N-methyl-p-nitroaniline producing is filtered with sulfuric acid dissolution acidifying, obtained liquid phase (2-methoxyl group-5-N-methyl-p-nitroaniline vitriol) is saltoutd and obtained Fast Scarlet G RC with industrial purified salt, be i.e. 2-methoxyl group-5-N-methyl-p-nitroaniline hydrochloride. For solving the problems of the technologies described above, the preparation method of a kind of Fast Red B base by-product Fast Scarlet G RC that the present invention proposes, comprises the following steps: 1) nitration reaction: in conjunction with Fast Red B base synthesis technique, after acetylization reaction finishes, adjacent acetamido methyl-phenoxide and methylene chloride are dropped in reactor, under stirring and reflux conditions, slowly drip concentrated nitric acid in reaction solution, carry out nitration reaction; Nitrated temperature 40-42 ℃; Nitrated time 40-70 minute. 2) hydrolysis reaction: after nitration reaction finishes, leave standstill and separate after acid water layer, add water in nitrification liquid; Start and stir, nitrification liquid is neutralized to neutrality with S-WAT; After Distillation recovery methylene dichloride, wash with water three times, after suction filtration, in itrated compound, add water and the NaOH aqueous solution again; Be hydrolyzed and remove the reaction of ethanoyl.Distillation temperature 40-82 ℃; Hydrolysis temperature is at 80-85 ℃; Hydrolysis time approximately 5 hours. 3) acidifying separates: after hydrolysis finishes, be cooled to 40 ℃ and carry out suction filtration to obtain liquid phase a stand-by; Filter cake is washed with water to neutrality and drains in input reactor, adds water and the vitriol oil, starts and stirs.Souring temperature is at 90-95 ℃; Acidificatoin time 2 hours; Completely be cooled to 40 ℃ and carry out suction filtration and obtain, after liquid phase b, liquid phase a under agitation slowly being joined in liquid phase b, being neutralized to pH is 8.5-9.0, then drops in reactor after washing suction filtration, adds water and the vitriol oil again to carry out acidifying and separates. 4) refining saltouing, the filtrate obtaining after acidifying is separated adds in reactor that industrial purified salt is saltoutd, suction filtration, the dry by-product Fast Scarlet G RC that obtains. The volume of methylene dichloride is 3.3-3.5ml/g with the ratio of the weight of adjacent acetamido methyl-phenoxide; The volume of concentrated nitric acid is 0.47-0.48ml/g with the ratio of the weight of adjacent acetamido methyl-phenoxide; The volume of the 30%NaOH aqueous solution is 1.16-1.17ml/g with the ratio of the weight of adjacent acetamido methyl-phenoxide; The volume of the vitriol oil is 0.11-0.13ml/g with the ratio of the weight of adjacent acetamido methyl-phenoxide; The ratio of the industry weight of purified salt and the weight of adjacent acetamido methyl-phenoxide is 0.41g/g; Drying temperature≤90 ℃. The preparation method's of a kind of Fast Red B base by-product Fast Scarlet G RC of the present invention reaction equation is as follows: In sum, the preparation method of a kind of Fast Red B base by-product Fast Scarlet G RC of the present invention, tool has the following advantages: 1) filtering through sulfuric acid dissolution, then saltouing with industrial purified salt, the Fast Scarlet G RC purity obtaining is up to more than 99.6%; 2) gained Fast Scarlet G RC reaches well 105 points for the product light fastness obtaining that dyes; 3) saltout salt consumption of industrial purified salt is low: 1 ton of Fast Scarlet G RC work consuming industry purified salt of every production declines more than 50%; 4) yield is high: 1 ton of Fast Red B base by-product Fast Scarlet G RC yield of every production improves more than 21%; 5) the excessive alkali neutralization of the process water solution after improvement, greatly reduces wastewater discharge. Embodiment Embodiment 1 (1) 60 grams of adjacent acetamido methyl-phenoxides and 200 milliliters of methylene dichloride are joined in 500 milliliters of four-hole boiling flasks with reflux exchanger and stirring, insert thermometer, by warming-in-water to 30 ℃, 28.5 milliliters of concentrated nitric acids are slowly dripped by dropping funnel until methylene chloride reflux (about 40-42 ℃), approximately 40 minutes acid adding time, adds in methylene chloride reflux situation and is incubated 30 minutes, is incubated complete 100 ml waters that add wherein, stir 5 minutes, leave standstill 10 minutes.Divide sub-cloud water with separating funnel. (2) oil phase in separating funnel is joined in 500 milliliters of there-necked flasks, add 260 ml waters, start stirring, liquid in flask is neutralized to neutrality with S-WAT, connect condenser, slowly heat up by water-bath, the methylene dichloride in flask is all steamed to (40-82 ℃).Steamed and the material in flask is cooled to 40 ℃ has poured suction filtration in No. 3 sand core funnels into, and washed with water three times, approximately 100 milliliters of each waters, wash Bi Jinliang and drain. (3) above-mentioned material is joined in 500 milliliters of there-necked flasks, add the liquid caustic soda of 165 ml waters and 70 milliliter 30%, start stirring, warming-in-water is to 80-85 ℃ and keep 5 hours, is completely cooled to 40 ℃.By No. 3 sand core funnel suction filtrations for the material in flask, drain as far as possible, the liquid phase a that suction filtration is obtained pour in 500 ml beakers, preserve stand-by.Material in funnel is washed with water to neutrality to be drained. (4) above-mentioned thing is joined in 500 milliliters of there-necked flasks, add the vitriol oil of 140 ml waters and 7.8 milliliter 98%, start stirring, warming-in-water is to 90-95 ℃ and keep 2 hours, is completely cooled to 40 ℃.By No. 3 sand core funnel suction filtrations for the material in flask, drain as far as possible, the liquid phase b that suction filtration is obtained pour in ml beakers, preserve stand-by. (5) the liquid phase b liquid phase a in 500 ml beakers in (3) under agitation slowly being joined in ml beakers in (4) neutralizes, being neutralized to pH value is 8.5-9.0, then in inciting somebody to action, carry out suction filtration with material with No. 3 sand core funnels, drain as far as possible, then wash approximately 100 milliliters of each waters three times.Washing Bi Jinliang drains. (6) above-mentioned material is joined in 500 ml beakers, add the vitriol oil of 65 ml waters and 7 milliliter 98%, start stirring, warming-in-water is to 90-95 ℃ and keep 2 hours.Then cool to 50 ℃, with No. 3 sand core funnel suction filtrations of preheating, filtrate is poured in 500 ml beakers, add 24.5 grams of industrial purified salts, fully stir until industrial purified salt all dissolves, then material in beaker is poured in No. 3 sand core funnels and drained as far as possible, finally material is put into baking oven and dried (temperature is no more than 90 ℃).Obtain purity and be 99.6% Fast Scarlet G RC10.7 gram, yield improves 21.8%. The above; be only the specific embodiment of the present invention, but the protection domain of invention is not limited to this, in the technical scope that any those of ordinary skill in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in the protection domain of invention.

Claims (7)

1. a preparation method of Fast Red B base by-product Fast Scarlet G RC, concrete steps are as follows: (1) nitration reaction: after finishing in conjunction with Fast Red B base synthesis technique acetylization reaction, adjacent acetyl-anisidine and methylene chloride are dropped in reactor, under stirring and reflux conditions, slowly drip concentrated nitric acid in reaction solution, carry out nitration reaction; Nitrated temperature 40-42 ℃; Nitrated time 40-70 minute; (2) hydrolysis reaction: after nitration reaction finishes, leave standstill and separate after acid water layer, add water in nitrification liquid, start and stir, nitrification liquid is neutralized to neutrality with S-WAT; After Distillation recovery methylene dichloride, wash with water three times, after suction filtration, in itrated compound, add water and the NaOH aqueous solution again; Be hydrolyzed and remove the reaction of ethanoyl, distillation temperature 40-82 ℃; Hydrolysis temperature is at 80-85 ℃; Hydrolysis time 5 hours; (3) acidifying separates: after hydrolysis finishes, be cooled to 40 ℃ and carry out suction filtration to obtain liquid phase a stand-by; Filter cake is washed with water to neutrality and drains in rear input reactor, adds water and the vitriol oil, starts and stirs, and souring temperature is at 90-95 ℃; Acidificatoin time 2 hours; Completely be cooled to 40 ℃ and carry out suction filtration and obtain, after liquid phase b, liquid phase a under agitation slowly being joined in liquid phase b, being neutralized to pH is 8.5-9.0, then drops in reactor after washing suction filtration, adds water and the vitriol oil again to carry out acidifying and separates; (4) refining saltouing: the filtrate obtaining after acidifying is separated adds in reactor that industrial purified salt is saltoutd, suction filtration, the dry by-product Fast Scarlet G RC that obtains; Concrete reaction parameter is as follows: (1) 60 grams of adjacent acetyl-anisidines and 200 milliliters of methylene dichloride are joined in 500 milliliters of four-hole boiling flasks with reflux exchanger and stirring, insert thermometer, by warming-in-water to 30 ℃, 28.5 milliliters of concentrated nitric acids are slowly dripped until methylene chloride reflux by dropping funnel, 40-42 ℃, 40 minutes acid adding time, add in methylene chloride reflux situation and be incubated 30 minutes, be incubated complete 100 ml waters that add wherein, stir 5 minutes, leave standstill 10 minutes, divide sub-cloud water with separating funnel; (2) oil phase in separating funnel is joined in 500 milliliters of there-necked flasks, add 260 ml waters, start stirring, liquid in flask is neutralized to neutrality with S-WAT, connect condenser, slowly heat up by water-bath, the methylene dichloride in flask is all steamed to 40-82 ℃, steam and the material in flask is cooled to 40 ℃ has poured suction filtration in No. 3 sand core funnels into, and wash with water three times, 100 milliliters of each waters, wash to finish and drain; (3) above-mentioned material is joined in 500 milliliters of there-necked flasks, add the liquid caustic soda of 165 ml waters and 70 milliliter 30%, start stirring, warming-in-water is to 80-85 ℃ and keep 5 hours, completely be cooled to 40 ℃, by No. 3 sand core funnel suction filtrations for the material in flask, drain as far as possible, the liquid phase a that suction filtration is obtained pours into and in 500 ml beakers, preserves stand-byly, the material in funnel is washed with water to neutrality and drains; (4) above-mentioned thing is joined in 500 milliliters of there-necked flasks, add the vitriol oil of 140 ml waters and 7.8 milliliter 98%, start stirring, warming-in-water is to 90-95 ℃ and keep 2 hours, completely be cooled to 40 ℃, by No. 3 sand core funnel suction filtrations for the material in flask, drain, the liquid phase b that suction filtration is obtained pour in ml beakers, preserve stand-by; (5) the liquid phase b liquid phase a in 500 ml beakers in (3) under agitation slowly being joined in ml beakers in (4) neutralizes, being neutralized to pH value is 8.5-9.0, then in inciting somebody to action, carry out suction filtration with material with No. 3 sand core funnels, drain as far as possible, then wash three times, 100 milliliters of each waters, wash Bi Jinliang and drain; (6) above-mentioned material is joined in 500 ml beakers, add the vitriol oil of 65 ml waters and 7 milliliter 98%, start stirring, warming-in-water is to 90-95 ℃ and keep 2 hours, then cool to 50 ℃, with No. 3 sand core funnel suction filtrations of preheating, filtrate is poured in 500 ml beakers, add 24.5 grams of industrial purified salts, fully stir until industrial purified salt all dissolves, then material in beaker is poured in No. 3 sand core funnels and drained as far as possible, finally material being put into baking oven dries, temperature is no more than 90 ℃, obtain purity and be 99.6% Fast Scarlet G RC10.7 gram, yield improves 21.8%. 2. according to the preparation method of a kind of Fast Red B base by-product Fast Scarlet G RC claimed in claim 1, it is characterized in that: described concentrated nitric acid concentration is 98%; Vitriol oil concentration is 98%; Aqueous sodium hydroxide solution concentration is 30%. 3. improve one's methods according to the preparation of a kind of Fast Red B base by-product Fast Scarlet G RC claimed in claim 1, it is characterized in that described drying temperature≤90 ℃; Industry purified salt is sodium-chlor. 4. according to the preparation method of a kind of Fast Red B base by-product Fast Scarlet G RC claimed in claim 1, it is characterized in that: the product that described itrated compound obtains is the mixture of 2-methoxyl group-4-nitracetanilide and 2-methoxyl group-5-nitracetanilide. 5. according to the preparation method of a kind of Fast Red B base by-product Fast Scarlet G RC claimed in claim 1, it is characterized in that: it is 2-methoxyl group-4-N-methyl-p-nitroaniline and 2-methoxyl group-5-N-methyl-p-nitroaniline that the product that the reaction of ethanoyl obtains is removed in described hydrolysis; Liquid phase a is the excessive alkali lye of hydrolysis. 6. according to the preparation method of a kind of Fast Red B base by-product Fast Scarlet G RC claimed in claim 1, it is characterized in that: it is during by product 2-methoxyl group-5-N-methyl-p-nitroaniline and sulfuric acid formation vitriol are soluble in the aqueous phase that described acidifying separates the liquid phase b obtaining. 7. according to the preparation method of a kind of Fast Red B base by-product Fast Scarlet G RC claimed in claim 1, it is characterized in that: described the obtained product of saltouing is Fast Scarlet G RC, i.e. 2-methoxyl group-5-N-methyl-p-nitroaniline hydrochloride. CN.7A -07-29 -07-29 Preparation method for byproduct scarlet base RC of red base B Expired - Fee Related CNB (en)

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* Cited by examiner, † Cited by third party Publication number Priority date Publication date Assignee Title CNA (en) * -11-08 -11-27 沈阳化工研究院设计工程有限公司 Treatment method for chloroform in aramid fiber solvent recovery wastewater CNA (en) * -11-10 -01-26 杭州臻挚生物科技有限公司 Preparation method of dichlorotoluene nitride intermediate CNB (en) * -05-13 -12-20 山东师范大学实验厂有限公司 A red base B separation process CNB (en) * -07-16 -03-26 淮阴工学院 Method for continuously synthesizing 2-methoxy-4-nitroacetanilide CNB (en) * -01-06 -01-23 常州大学 Continuous flow high-efficiency production method of 2-amino-4-nitrotoluene CNA (en) * -01-17 -05-02 浙江万丰化工股份有限公司 A kind of method for synthesizing 2-methoxy-4-nitroacetanilide in continuous flow reactor

Citations (5)

* Cited by examiner, † Cited by third party Publication number Priority date Publication date Assignee Title USA (en) * -10-23 -07-15 Bayer Aktiengesellschaft Process for the preparation of nitroaminobenzenes CNA (en) * -03-13 -09-26 镇江市染料化工二厂 A kind of production method of glacial dye CNA (en) * -05-09 -11-23 天津大学 A kind of preparation method of red base GL CNA (en) * -03-10 -09-27 天津大学 A kind of preparation method of red base B PLB1 (en) * -03-22 -08-31 Politechnika Slaska Im Wincent Method for obtaining 5-nitroguaiacol

- -07-29 CN CN.7A patent/CNB/en not_active Expired - Fee Related

Patent Citations (5)

* Cited by examiner, † Cited by third party Publication number Priority date Publication date Assignee Title USA (en) * -10-23 -07-15 Bayer Aktiengesellschaft Process for the preparation of nitroaminobenzenes CNA (en) * -03-13 -09-26 镇江市染料化工二厂 A kind of production method of glacial dye PLB1 (en) * -03-22 -08-31 Politechnika Slaska Im Wincent Method for obtaining 5-nitroguaiacol CNA (en) * -05-09 -11-23 天津大学 A kind of preparation method of red base GL CNA (en) * -03-10 -09-27 天津大学 A kind of preparation method of red base B

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