Pollution prevention strategy at an H-acid …
Manufacturing process and waste generation H-acid production was a batch process. On aver- age, 30-34 batches were carried out in a month. Naphthalene was the starting material for H- acid synthesis. It was subjected to a series of chemical reactions like sulphonation, nitration followed by neutralization, reduction, fusion and isolation.
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Recent advances in treatment technology of …
This review examines the principles, characteristics, advantages and disadvantages of the most recently developed advanced practical H-acid treatment technologies.
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Application of catalytic wet air oxidation for the treatment of H-acid
All the H-acid is decomposed in 5 min and is oxidized into NH4+, SO4(2-) formic acid, acetic acid and other end products. The pH value can greatly affect the COD removal and the production of organic acid. CWAO process not only can get a high reaction rate, but also can oxidize the short-chain organic acid.
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Synthesis processes of H‐acid. | Download Scientific Diagram
H‐acid, a prevalent pollutant in dyeing wastewater, is primarily utilized in the pharmaceutical and textile industries.
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Synthesis processes of H‐acid. | Download Scientific Diagram
H‐acid, a prevalent pollutant in dyeing wastewater, is primarily utilized in the pharmaceutical and textile industries. However, H‐acid treatment remains a challenge because of its high concentration, degradation resistance and poor biodegradability.
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H-Acid: Processing Technology, Products, Market, Trade …
H-acid production is a batch process; The process steps to produce proper dyes are: Known quality of raw materials, Possible mole to mole reaction Optimal pH control, Optimal Temperature control, Standardized the reaction efficiency and try to continuous improve it, Avoid filtration of dye if possible and adopt spay drying in house or out ...
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Application of catalytic wet air oxidation for the treatment of H-acid
The Ce3Cu1 composite catalyst is a high-performance catalyst in the CWAO process. When temperature is 200°C, oxygen partial pressure is 3.0 MPa, pH value is 12.0, reaction time is 30 min, the COD removal is more than 90%, and the lowest pH value of reaction solution during CWAO of H-acid solution is kept at about 6.There are many factors that can …
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Decolorisation of H‐acid manufacturing process wastewater by …
H-acid (1-amino-8-naphthol-3, 6-disulfonic acid) was selected as target compound to evaluate the performance of this novel process. The removal of H-acid and TOC (total organic carbon) for H-acid ...
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Cleaner production through enhanced resource recovery …
Research on the synthesis of H-Acid has been going on for many decades. Several methods for H-Acid synthesis and industrial production have been published mainly in the 1970s and 1980s.
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Sulfonation method in H acid production
H acid is slightly soluble in cold water and easily soluble in hot water, soda ash, caustic soda and other alkaline solutions. Sulfuric acid (or hydrochloric acid) is added in the acidification process to wash out H acid but sodium sulfate, and the filtered H acid wastewater belongs to typical organic wastewater with high concentration, high chroma and high biological toxicity.
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Cleaner production through enhanced resource recovery and …
This study explores the ways to enhance cleaner production and resource recovery in the dye intermediates industry, focusing on the integration of H-acid and Vinyl …
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Recent advances in treatment technology of wastewater containing H‐acid
However, H-acid treatment remains a challenge because of its high concentration, degradation resistance and poor biodegradability. This review examines the principles, characteristics, advantages and disadvantages of the most recently developed advanced practical H-acid treatment technologies.
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(PDF) Brownfield Technological Interventions in Dye Intermediate
Accordingly, in this study, a detailed mass balance of H-Acid production is studied by analyzing each unit operation and unit process in two H-Acid manufacturing units in India having...
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H Acid | chemistry | Britannica
Other articles where H Acid is discussed: dye: Azo dyes: H-acid (8-amino-1-naphthol-3,6-disulfonic acid) has both functional groups and can be selectively coupled to two diazo components in a two-step process. C.I. Acid Black 1 is formed by coupling first to diazotized p-nitroaniline in weakly acidic solution and then to diazotized aniline in alkaline solution.
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(PDF) Brownfield Technological Interventions in …
Accordingly, in this study, a detailed mass balance of H-Acid production is studied by analyzing each unit operation and unit process in two H-Acid manufacturing units in India having...
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(PDF) Brownfield Technological Interventions in Dye Intermediate
Accordingly, in this study, a detailed mass balance of H-Acid production is studied by analyzing each unit operation and unit process in two H-Acid manufacturing units in India having 5-10 Ton/day ...
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Performance Evolution of Zero Effluent Discharge …
G-salt recovered by using Crystallizer: During manufacturing process of H-Acid Sodium Sulphate (G-Salt) is formed which is in soluble form. Sodium sulphate is recovered from Crystallizer which can be reused in process itself.
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Is the naphthalene sulfonate H-acid biodegradable in mixed …
Synthetically prepared wastewater originating from the H-acid (4-Amino-5-hydroxy-2,7-naphthalene disulfonic acid) manufacturing process was subjected to respirometric analysis for evaluating the level of achievable biodegradation in the presence of this commercially important azo dye precursor. For this purpose, H-acid was mixed with synthetic ...
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Structure of H acid. | Download Scientific Diagram
H acid is an important dye intermediate, which is synthesized by following the sulfonation, nitration, reduction and alkali fusion/hydroxylation. Figure 1 shows the structure of the H acid.
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Everything You Need to Know About H-acid …
H-acid is extracted from naphthalene through a process that combines several steps, including nitration, hydrolysis, and suffocation. The chemicals used are sulphuric acid, Oleum, naphthalene, nitric acid, lime …
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H Acid | chemistry | Britannica
Other articles where H Acid is discussed: dye: Azo dyes: H-acid (8-amino-1-naphthol-3,6-disulfonic acid) has both functional groups and can be selectively coupled to two diazo components in a two-step process.
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Cleaner production through enhanced resource recovery …
The reuse of Spent Mixed Acid from VS in the HA production process has a two-fold advantage: (1) the mineral acids contribute to acidity in the Isolation step and promote the precipitation of the desired HA product and (2) the quantity of wastewater discharged from VS production decreases.
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Performance Evolution of Zero Effluent Discharge System for H-Acid
MANUFACTURING PROCESS OF H-ACID In actual production technology, hardly 40% of H-Acid is converted from Naphthalene. The process stage wise Raw material conversion [2] as per table:1 and Mass Balance Diagram as per Figure:1 Table: 1Stage wise Raw Material Conversion Sr. Process Conversion No Stage . 1. Sulpho78 % of Naphthalene to nation 3,6,8 ...
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Decolorisation of H‐acid manufacturing process …
Anion exchange resin was employed to examine the feasibility to treat the H‐acid manufacturing wastewater by column experiment. Besides the acidity recovery, the decoloring efficiency and chemical oxygen demand (COD) removal efficiency of the anion exchange resin was investigated in the experiments.
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Performance Evolution of Zero Effluent Discharge …
Discharge System for H-Acid Manufacturing Unit Mayur 1Sanandiya Lecturer, Department of Environmental Engineering, Shri K.J.Polytechnic, Bharuch, Gujarat, India1 ABSTRACT: H-Acid (1-Amino, 8 ... which is reused back in the process for hot water wash /cooling tower. The concentrate mother liquor having specific gravity 1.3-1.35, is incinerated. ...
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Decolorisation of H‐acid manufacturing process wastewater …
Anion exchange resin was employed to examine the feasibility to treat the H‐acid manufacturing wastewater by column experiment. Besides the acidity recovery, the decoloring …
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Decolorisation of H‐acid manufacturing process …
Anion exchange resin was employed to examine the feasibility to treat the H-acid manufacturing wastewater by column experiment. Besides the acidity recovery, the decoloring efficiency and chemical oxygen demand (COD) removal efficiency of the anion exchange resin was investigated in the experiments.
WhatsApp: +86 18221755073
Cleaner production through enhanced resource recovery and …
The reuse of Spent Mixed Acid from VS in the HA production process has a two-fold advantage: (1) the mineral acids contribute to acidity in the Isolation step and promote the …
WhatsApp: +86 18221755073
Performance Evolution of Zero Effluent Discharge …
G-salt recovered by using Crystallizer: During manufacturing process of H-Acid Sodium Sulphate (G-Salt) is formed which is in soluble form. Sodium sulphate is recovered …
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Application of ferrous-hydrogen peroxide for the treatment of H-acid
1-Amino-8-naphthol-3,6-disulfonic acid (H-acid) is widely used in chemical industries for synthesis of direct, acid, reactive and azoic dye. The wastewater from H-acid manufacturing process is rich in various substituted derivatives of naphthalene and is one of the most hardly-treated wastewaters.
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