Full resolution (JPEG) - On this page / på denna sida - VII. Manufacturing Industries. Introd. by [G. Sundbärg] K. Åmark - 8. Manufactures of Stone, Clay, Coal, Charcoal, and Peat - Gas and Acetylene. By Alf. Larson
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gas and acetylene.
420
especially in America, has not yet been at all generally introduced into Sweden, even
though C. A. Dellwik, a Swede, has discovered an economical method of producing it.
G. Dalen.
The coal-tar produced at the large gas-works is used to make asphalte,
carbolic acid, creosote, and other oils, which are used for impregnating wood and
paste-board. For the figures dealing with the import and export of coal-tar, see
Table 39, page 218, and for the manufacture of coke see page 272. — The
sulphur left behind in the oxide after the purification of the gas is recovered
by a roasting process, similarly that employed for the production of sulphur acids
from pyrites (in the manufacture of sulphite cellulose). At the ten largest
gasworks the ammonia is recovered principally in the form of ammonium sulphate;
and also the cyan-compounds are recovered at some of the larger gasworks.
A new form of illuminant has been in use since about 1895: Acetylene
gas. That gas is now generated by a very simple process, viz. the action
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