The determination of naphthalene in town gas by the picrate method. III. Miscellaneous observations

✍ Scribed by Mott, R. A. ;Moulson, I.

• Publisher: Wiley (John Wiley & Sons)
• Year: 2007
• Weight: 502 KB
• Volume: 7
• Category: Article
• ISSN: 0021-8871
• DOI: 10.1002/jctb.5010071007

✦ Synopsis

Abstract

The performance of a naphthalene washer is dependent on the ambient temperature and thus can vary considerably between day and night and between successive days. It follows that the duration of a naphthalene test should be 24 h. No difficulty arises in collecting ‘sufficient naphthalene’ in this period, even for gas of the lowest naphthalene concentration at present specified, if the rate of gas flow is increased to 12 cu. ft./h. and an efficient absorption system is employed. In the recommended method, the wash‐bottles are immersed in a thermostatically controlled bath and a correction applied for the loss of naphthalene due to dissociation of naphthalene picrate. For the filtration of the recovered picrates, a No. 3 porosity sintered‐glass disc is recommended. The error in the recommended method due to saturated hydrocarbons which do not cause blockage of fine gas services (such as 1‐methylnaphthalene) is likely to be small, as the test is carried out at a temperature above the conventional 0°.