Abstract: The present invention relates to a process for the manufacture of microporous carbon materials to perform selective separations of nitrogen in gas mixtures such as hydrogen sulfide, carbon dioxide, methane and C2, C3 and C4+ hydrocarbons, with high efficiency, shaped of microspheres or cylinders from copolymers of poly (vinylidene chloride-co-methyl acrylate) with density of 1.3 to 1.85 g/cm·sup·3 or poly (vinylidene chloride-co-vinyl chloride) with density of 1.3 to 1.85 g/cm.sup.3, using two stages. The first stage consists of a surface passivation of the material by chemical attack in a highly alkaline alcohol solution, with the aim of effecting a precarbonization on the surface of the copolymer that during the pyrolysis process is not deformed and gradually develops microporosity. The material of the first stage presents, in the layer, percentages between 55% to 85% carbon, between 5% to 20% oxygen, and between 10% to 40% chlorine.

Abstract: A supplementary separator for a combine having straw walkers. The supplementary separator comprising a rotor transversely arranged above the straw walkers. The rotor is provided with a rotatable housing having an eccentric axle located therein. A plurality of freely rotatable tines are mounted to the eccentric axle and extend outwardly from the rotor housing for engaging the crop mat on the straw walkers. The rotor is rotated to overshot convey the crop mat on the straw walkers.

Abstract: A crop processing arrangement (28) is proposed with a cylindrical rotor housing (42), an eccentric axle (44) rotatively supported in bearings therein and tines (46) rotatively supported in bearings on the eccentric axle (44). The transverse inclination of the tines can be varied by shifting the axial position of the eccentric axle relative to the cylindrical rotor housing. In this way a loosening and sideways movement of the crop conveyed by the tines (46) is attained with a relatively simple mechanism.