Abstract: Method for producing pulp by using an alga containing cellulose in the cell wall and having the long algae body with the ratio of length to width being 10 to 200 as an ingredient by giving no special treatment or by giving a simple bleaching treatment to produce pulp.

Abstract: A method for dust removal from a solid-gas contact reactor for dust-laden exhaust gases which includes a packing section composed of packings each having a plurality of passages formed in the flow direction of the gases to be handled. Jets of gas for cleaning use are issued from a bank of stationary or movable nozzles installed in the reactor against the face at the inlet end of the packing section so as to blow off economically and efficiently the dust and other particulate matter that have settled from the gases on the packing section and have grown or bridged as a deposit thereon. The distance from the nozzles to the face of the packing section to be cleaned ranges from 0.2 to 1.0 meter, and the gas jet velocity at the inlet of the same section ranges from 5 to 40 m/sec.