Automotive exhaust system using filter containing calcium carbon

Details Automotive exhaust system using filter containing calcium carbon Automotive exhaust system using filter containing calcium carbon

1976-06-01

1978-06-06

Tayman, Jr., James H.

Chemistry: physical processes

Physical processes

Crystallization

23288F, 55DIG30, 55524, 423212, 428537, 428539, B01J 122, B01D 3518

Patent

active

040934225

ABSTRACT:
Automotive exhaust gases, and especially the exhaust gases which have been further oxidized by a treatment in a catalytic converter, are treated by passing them through a filter containing paper coated with a calcium carbonate coating. The paper is desirably coated on both sides with heavy coatings and wound into a roll with spacers extending through the roll to permit the gases to pass therethrough. The calcium carbonate desirably constitutes at least 85% of the weight of pigments and fillers in the coating and the proportion of binder does not exceed 20% of the total weight of pigments and fillers. The acidic gases in the exhaust, and particularly the oxides of sulfur, react with the finely divided particles of calcium carbonate in the coating to form an ash which flakes off from the lower face of the roll while the gases pass upwardly through the roll.

REFERENCES:
patent: 3925021 (1975-12-01), Yoshino et al.
patent: 3951865 (1976-04-01), Norback
patent: 3954417 (1976-05-01), Jalbing

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