Process for selecting shaped particles, a process for installing a system, a process for reacting a gaseous feedstock in such a system, a computer program, a computer program product, and a computer system

A process for selecting shaped particles for use in a system which comprises a tube which is capable of being packed with shaped particles to form a packed bed in the tube, wherein the process comprises:

• defining a desired value of one or more properties of the packed bed,
• calculating dimensions of the shaped particles such that a packed bed in the tube of the shaped particles having the calculated dimensions meets or substantially meets the desired value(s), and
• selecting shaped particles in accordance with the calculated dimensions,
• wherein the said one or more properties of the packed bed comprise one or more of:
• the volume fraction which is occupied by shaped particles,
• the packing density, and
• the resistivity for a gas flowing through the packed bed causing a pressure difference between a gas inlet and a gas outlet of the packed bed, which resistivity is defined by the expression:
• ΔP=R×ρ×V2,
• wherein ΔP represents the pressure difference per unit length of the packed bed, R represents the resistivity, ρ represents the density of the gas and V represents the superficial gas velocity, wherein the density of the gas and the superficial gas velocity are as measured at the average value of gas inlet temperature and gas outlet temperature of the packed bed and the average value of gas inlet pressure and gas outlet pressure of the packed bed.