Abstract: Apparatus for controlling a flow of granular material wherein a first member has a first conical side wall and a second member has a second conical side wall arranged adjacent to the first conical side wall so that a passage is defined between the wall of the adjacent side walls, wherein at least the second conical side wall of the second member is provided with a device for introducing aeration agent into the passage.

Abstract: In a fluidized catalytic cracking apparatus a mixture of hydrocarbon products and hydrocarbon catalyst particles is removed from a reactor riser (1) and introduced into a cyclone separator (2), wherein in order to strip the catalyst particles, primary steam is injected into the cyclone separator (2), and wherein, for additional stripping the catalyst particles are introduced into a stripper assembly (3) comprising at least two interconnected stripper vessels (4, 5) into which secondary steam is introduced.

Abstract: Salts from a salt deposit including magnesium and potassium salts are mined by a solution process in a cavity at the lower end of a borehole. A solvent liquid (water) is injected into the cavity at a level that is periodically raised whereby super imposed slices or cuts of the part of the deposit around the borehole are consecutively dissolved. Brine is recovered from a low level in the cavity. The injection rate of the solvent liquid and the recovery rate of the brine are controlled such that the vertical distribution of the potassium content of the brine in the cavity shows a maximum within the uppermost slice or cut.