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Water Characteristic Suitability for Textile Wet Processing and Its Remedy Measures

Mahmuda Begum
Principle Scientific Officer
Fibre Chemistry Department, Chemistry Division, BJRI

Mubarak Hossen
Senior Scientific Officer
Fibre Chemistry Department, Chemistry Division, BJRI

Ayesha Khatton
Scientific Officer
Industrial Chemistry Department, Chemistry Division, BJR

Abstract/ Executive Summary:

Numerous impurities always occur in various sources of water. Water is a unique solvent, which dissolves most of the inorganic and organic compounds. These comprise acidic and alkaline compounds, and dissolved oxygen. The content of impurities in the water used in textile wet processing was investigated, because of their possible destructive effect on wet processes, machineries, boilers and other related materials. The present study was carried out according to standard titrimetric and redox reaction methods. Remedial measures were also studied for water adequacy.

Keywords: Acidity, Alkalinity, Dissolved oxygen, Textile wet processing

Location: Chemistry Division, Bangladesh Jute Research Institute, Manik Mia Avenue, Dhaka-1207, Bangladesh

Start Date: 01-01-2007

End Date: 01-01-2009

Program Area: Resource Development and Management

Commodity: Jute products

Objectives:

Studies of intrinsic and extrinsic properties, micro and macro properties of jute and jute products and their modification with physical, chemical, biotechnological and other possible means

Methodology:

Phenolphthalein acidity 50 mL of suspended solid free water were put in a 250 mL conical flask, and 2-3 drops of alcoholic phenolphthalein were added. Titration was carried out with a 0.1N NaOH solution, until a faint permanent pink color appears, at pH 8.3. Alkalinity 2-3 drops of an alcoholic phenolphthalein solution and aqueous methyl orange solution were added to 50 mL of suspended solid free water, then titrated with a 0.1N HCl solution up to an orange pink end point. Dissolved oxygen test The test was carried out according to the redox reaction method. According to the procedure with alkaline potassium iodide, a manganese sulphate solution and a 3:1 H2SO4-acid solution were added to the sample, and the thus liberated iodine was titrated with a standard sodium thiosulphate solution (0.01 N), using starch as an indicator. The result was calculated by the redox reaction method. Simultaneously, a blank test was conducted under identical conditions.

Source of Information: Cellulose Chem. Technol., 43 (4-6), 189-192 (2009)

Article Link (Online Journal):

Funding Source:

1. Bangladesh Agricultural Research Council

Budget: 3,00,000.00

Total Budget (Tk.) : NaN

Achievement/Findings:

1. Demineralization might reduce the effect of excessive alkalinity, the boiler feed water being conditioned by lime soda or Zeolite processes. Demineralization is also useful for removing the
effect of acidity, which causes corrosion.

2. The amount of dissolved oxygen could be reduced by adding reducing agents, such as sodium sulphite or hydrazine, or oxidizing catalysts such as copper salts; water softening is the best way to prevent corrosion, due to the presence of dissolved oxygen and of other elements/compounds.

Knowledge Management: Journal