Chemical feed distributors and methods of using the same

A method for distributing a chemical feed, the method comprising:

• passing a chemical feed stream through a chemical feed inlet into a chemical feed distributor, wherein the chemical feed stream is gaseous and the chemical feed distributor comprises a body comprising one or more walls and a plurality of chemical feed outlets, wherein the one or more walls define an elongated chemical feed stream flow path, wherein the plurality of chemical feed outlets are spaced on the one or more walls along at least a portion of the length of the elongated chemical feed stream flow path, wherein the elongated chemical feed stream flow path defined by the one or more walls comprises an upstream fluid flow path portion along a first segment of the distance of the elongated chemical feed stream flow path starting from the chemical feed inlet and a downstream fluid flow path portion along a second segment of the distance of the chemical feed stream flow path, and wherein the one or more walls are positioned such that an average cross-sectional area of the upstream fluid flow path portion is greater than an average cross-sectional area of the downstream fluid flow path portion;
• and
• passing the chemical feed stream along the elongated chemical feed stream flow path and out of the chemical feed distributor and into a vessel through the plurality of chemical feed outlets,
• wherein a temperature inside the vessel is greater than 650° C. and a circumferential maximum surface temperature of the chemical feed distributor does not exceed 650° C., and wherein a fluidized catalyst is present in the vessel.