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H-acid (1-Amino, 8-Naphtol, 3-6 disulphonic acid) is a dye intermediate. In India, it is mainly manufactured by small and medium-sized enterprises (SMEs) with a production capacity of between 10 and 100 tonnes per month.

TitlePollution prevention strategy at an H-acid manufacturing unit
Publication TypeJournal Article
Year of Publication1995
AuthorsVenkatesan, N., Saxena, A.K.
Paginationp. 50-53: 4 fig., 3 tab.
Date Published1995-01-01
Keywordsacids, cost savings, hazardous wastes, india gujarat ahmedabad, industrial wastewater, pollution control, production, recycling, water reuse
Abstract

H-acid (1-Amino, 8-Naphtol, 3-6 disulphonic acid) is a dye intermediate. In India, it is mainly manufactured by small and medium-sized enterprises (SMEs) with a production capacity of between 10 and 100 tonnes per month. While the manufacture of these toxic dye intermediates is being abandoned in the developed world, SMEs, such as H-acid plants, are being promoted in India as potential foreign exchange earners. This article concerns the considerable savings (US$ 60,000 per year) that can result from simple pollution prevention measures in a typical H-acid unit in Ahmedabad, Gujarat, with a production capacity of 10 tonnes per month. Through process modification the product yield is increased by 7.7 per cent, resulting in the elimination of about 40 per cent of the COD (chemical oxygen demand) load to the subsequent wastewater treatment system. Potential areas for hazardous waste minimization, such as recycling, and exchange are also highlighted.

Notes2 ref.
Custom 1351.3
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