Reactor for non-isothermal reactions

A reactor for gas-phase non-isothermal reactions (100) comprising: - a tubular reactor (10) comprising at least one tube (11) through which reaction fluids (A) pass and in which tubular reactor a portion (30) is defined where at least a non-isothermal reaction takes place; - a shell (20) external to said tubular reactor (10) in which a cooling/heating fluid (B) passes wherein (i) The reaction fluids (A) enter at the head of said tubular reactor (10) and exit at the tail of said tubular reactor (10) and said portion (30) where at least an exothermic reaction takes place is filled with a specific catalyst for the said reaction, while the remaining portion of the tubular reactor (10) is empty; (ii) the cooling/heating fluid (B) flowing in the shell (20) can be introduced into the said reactor in the gas phase, in the liquid phase and/or a combination of both and, acts both as a cooling fluid and as a heater of the reaction fluids (A) in different portions of the same tubular reactor (iii) in said outer shell (20) at least one liquid-gas separation zone (40) is defined, in which at least one liquid-gas separation stage of the cooling/heating fluid takes place