Buchi Scrubber K-415 Manual de usuario descargar pdf (Pagina 37)

5 Putting into operation

37 K-415 Operation Manual, Version B

5.9.1 Washing solutions for acidic vapors and gases

• Sodium hydroxide 8-10 %, max. 20 %

• Sodium carbonate

– dissolve 600 g Na

in 3 L distilled warm water, or

– dissolve 1.7 kg Na

· 10 H

O in 3 L distilled warm water

Color indicator

A color indicator is added to the washing solution to assess its washing power visually as well.

We recommend to use a spatula tip of color indicator for 3 L of washing solution.

Bromothymol blue serves as a stan dard indicator. The transition area here is between pH 6.0 to 7.6.

Thus the fresh solution has a blue color while the neutralized or acidic solution has an orange yellowish

color.

Depending on the application purpose, other suitable color indicators should be used.

5.9.2 Washing solutions for alkaline vapors and gases

• Hydrochloric acid, max. 15 %

• Sulphuric acid, max. 20 %

Depending on the area of application, it is recommended to use different washing solutions or concen-

trations. The Scrubber K-415 is supplied ex works with a base-resistant lip gasket.

NOTE

For operating with acid washing solutions, an acid-resistant lip gasket should be used.

Color indicators

Table 5-1: Indicators for washing solutions for alkaline vapors and gases

Name Transition pH range Color change

Bromocresol green 3.8 - 5.4 yellow to blue

Bromothymol blue 5.8 - 7.6 yellow to blue

Methylen red 4.4 - 6.2 yellow to red

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 59 60

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Buchi Scrubber K-415 Manual de usuario Pagina 37