PCT No. PCT/SK97/00006 Sec. 371 Date Jun. 1, 1999 Sec. 102(e) Date Jun. 1, 1999 PCT Filed Jul. 4, 1997 PCT Pub. No. WO98/39368 PCT Pub. Date Sep. 11, 1998The nature of the process consists in that the low-grade organic substances are subject, at a temperature of 150 DEG C. to 700 DEG C. and at a pressure of 0.1 MPa to 2.5 MPa, to the action of a moving bed of solid particles of a substance which perform whirling motion, whereby the solid particles of a substance constituting the moving bed are set to whirling motion by intensive agitation. The device consists of a reaction chamber (1) with a rotation mechanism (2) which rotation mechanism (2), located rotably in the faces of the reaction chamber (1), consists of a shaft (3) to which vanes (5) are symetrically attached by means of driving discs (4). The vanes (5) may be arranged in 3 to 10 rows, and they may be provided with openings (5.1) or cut-outs (5.2) of various geometrical shapes, and they may be divided into individual segments (5.3). Also the driving discs (4) may be provided with openings (4.1) of various geometrical shapes.