| 摘要 |
The invention relates to a process for the production of motor fuel tanks from polyethylene where a certain number of hydrogen atoms on its internal surface have been replaced by sulphonic acid salt groups, by treatment of the internal surface of polyethylene tanks first with sulphur trioxide and then with ammonia, characterised in that a) an excess of gaseous sulphur trioxide is introduced in turbulent flow into the interior of polyethylene tanks, and b) is allowed to act in the interior of the tanks until the desired degree of sulphonation has been reached, then c) the unconsumed sulphur trioxide is expelled from the interior of the tanks, then d) an excess of gaseous ammonia is introduced in turbulent flow into the interior of the tanks, and e) the ammonia is allowed to act in the interior of the tanks until the sulphonic acid groups have been neutralised, then f) the unconsumed ammonia is flushed out of the interior of the tanks, and finally g) the tanks are dried or allowed to dry internally. In this way, the sulphonic acid salt groups can be introduced in a simple manner and very uniformly on the internal surface.
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