Conversion of heavy hydrocarbon to aromatics and light olefins

A process for the conversion of a heavy hydrocarbon stream to light olefins, said process comprises the steps of:

• (a) introducing said heavy hydrocarbon stream comprising a heavy hydrocarbon having at least 5 carbon atoms per molecule to a reaction zone, said reaction zone contains a zeolite catalyst and is operated under reaction conditions for converting heavy hydrocarbons to light olefins;
• (b) withdrawing from said reaction zone a reactor effluent comprising light olefins;
• and
• (c) controllably introducing a paraffin stream comprising a paraffin, said paraffin comprises pentane, to said reaction zone such that the mole ratio of said paraffin to said heavy hydrocarbon introduced into said reaction zone is in the range of from about 0.1:10 to about 10:0.1, whereby the percent conversion of said heavy hydrocarbon stream to light olefins is enhanced over the percent conversion of said heavy hydrocarbon stream to light olefins when there is no step (c).

A method for increasing the yield of light olefins in a process for converting heavy hydrocarbons to light olefins and BTX, said method comprising;

• (a) introducing a heavy hydrocarbon stream comprising at least one heavy hydrocarbon having at least 5 carbon atoms per molecule into a reaction zone containing a zeolite catalyst and operated under reaction conditions for converting said heavy hydrocarbon stream to light olefins and BTX;
• (b) introducing a paraffin stream comprising a paraffin into said reaction zone as a co-feed with said heavy hydrocarbon stream, said paraffin comprises pentane;
• (c) withdrawing from said reaction zone a reactor effluent comprising light olefins;
• (d) controlling the rate of introduction of said paraffin stream of introducing step (b) such that the percent conversion of said heavy hydrocarbon stream to light olefins exceeds the percent conversion of said heavy hydrocarbon stream to light olefins when there is no introducing step (b).

A method for increasing the conversion of heavy hydrocarbons to light olefins in a process for converting heavy hydrocarbons to light olefins and BTX, said method comprising:

• (a) introducing a heavy hydrocarbon stream comprising a heavy hydrocarbon having at least 5 carbon atoms per molecule into a reaction zone containing a catalyst consisting essentially of a zeolite having incorporated therein a promoter selected from the group consisting of sulfur, silicon, boron, tin, magnesium, germanium, zinc, titanium, zirconium, molybdenum, lanthanum, cesium, iron, cobalt, nickel and combinations of any two or more thereof, and operated under reaction conditions for converting said heavy hydrocarbon stream to light olefins and BTX;
• (b) introducing a paraffin stream comprising a paraffin into said reaction zone as a co-feed with said heavy hydrocarbon stream, said paraffin comprises pentane;
• (c) withdrawing from said reaction zone a reactor effluent comprising light olefins;
• (d) identifying a percent conversion of said heavy hydrocarbon stream to light olefins when there is no introducing step (b);
• and
• (e) controlling the rate of introduction of said paraffin stream of introducing step (b) such that the percent conversion of said heavy hydrocarbon stream to light olefins exceeds said percent conversion of identifying step (d).

A method for increasing the conversion of heavy hydrocarbons to light olefins in a process for converting heavy hydrocarbons to light olefins and BTX, said method comprising:

• (a) introducing a heavy hydrocarbon stream comprising a heavy hydrocarbon having at least 5 carbon atoms per molecule into a reaction zone containing a catalyst consisting of a zeolite having incorporated therein a promoter selected from the group consisting of sulfur, silicon, boron, tin, magnesium, germanium, zinc, titanium, zirconium, molybdenum, lanthanum, cesium, iron, cobalt, nickel and combinations of any two or more thereof, and operated under reaction conditions for converting said heavy hydrocarbon stream to light olefins and BTX;
• (b) introducing a paraffin stream comprising a paraffin into said reaction zone as a co-feed with said heavy hydrocarbon stream, said paraffin comprises pentane;
• (c) withdrawing from said reaction zone a reactor effluent comprising light olefins;
• (d) identifying a percent conversion of said heavy hydrocarbon stream to light olefins when there is no introducing step (b);
• and
• (e) controlling the rate of introduction of said paraffin stream of introducing step (b) such that the percent conversion of said heavy hydrocarbon stream to light olefins exceeds said percent conversion of identifying step (d).