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A reactor for carrying out a chemical reaction in a three phase slurry system providing a horizontal reaction vessel with a cross sectional area which is dependent on the vessel length, vessel diameter, and axial position. The vessel has a gas inlet at or near the bottom of the reaction vessel and a

A reactor for carrying out a chemical reaction in a three phase slurry system providing a horizontal reaction vessel with a cross sectional area which is dependent on the vessel length, vessel diameter, and axial position. The vessel has a gas inlet at or near the bottom of the reaction vessel and a gas distributor. The gas product exits the vessel by conduit means at or near the top of the reaction vessel. The vessel includes a plurality of horizontal cooling coils to provide a cooling medium to the slurry. In the reaction vessel, the synthesis gas has an average linear velocity which is a function of the vessel cross sectional area.

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1. A single stage Fischer-Tropsch reactor system for carrying out a chemical reaction in a fluidized three phase slurry system, operating with an internal syngas recycle in a homogeneous flow regime which reactor system comprises: (a) a single stage cylindrical reaction vessel having a horizontal ax

1. A single stage Fischer-Tropsch reactor system for carrying out a chemical reaction in a fluidized three phase slurry system, operating with an internal syngas recycle in a homogeneous flow regime which reactor system comprises: (a) a single stage cylindrical reaction vessel having a horizontal axis with a cross sectional area perpendicular to the gas flow, where said gas flow traverses the diameter of the cylindrical reactor from the bottom along the entire length of the reactor, where the reaction vessel has a top and a bottom and where the reaction vessel has a height perpendicular to both the horizontal axis and to the ground and a horizontal length where the horizontal length is greater than the height and wherein the cross sectional area varies with the height;(b) a fluidized three phase slurry system within the vessel operating with an internal syngas recycle in a homogeneous flow regime;(c) a synthesis feed gas inlet at or near the bottom of the reaction vessel where the feed gas inlet introduces synthesis feed gas into the reaction vessel;(d) a gas distributor system, with a plurality of orifices and nozzles at or near the bottom of the reaction vessel running the length of the bottom of the reactor where the gas distributor system provides for distribution of the feed gas along the reactor's length;(e) a single set of cooling coils in the reaction vessel to remove heat;(f) at least two sidewall downcomers to provide improved fluidization of catalyst particles throughout the reactor where the downcomers are perpendicular to the reactor longitudinal axis;(g) a conduit at or near the top of the reaction vessel for removal of unreacted feed gas, light products, and water; and(h) a solid liquid products separation system to remove liquid products from the reaction vessel. 2. The reactor system of claim 1 where the solid liquid products separation system comprises one or more of the following: internal filters, external filters, settlers, hydro cyclones, and magnetic devices. 3. The reactor system of claim 1 where the feed gas contains hydrogen and carbon monoxide. 4. The reactor for carrying out a chemical reaction in a three phase slurry system as set forth in claim 1 including internal draft tubes distributed radially within said vessel. 5. A single stage Fischer-Tropsch reactor system for carrying out a chemical reaction in a fluidized three phase slurry system operating with an internal syngas recycle in a homogeneous flow regime which reactor system comprises: (a) a single stage cylindrical reaction vessel having a horizontal axis with a cross sectional area perpendicular to the gas flow, where from the bottom and along the entire length of the reactor gas flow traverses the diameter of the cylinder, and where the reaction vessel has a top and a bottom and where the reaction vessel has a height perpendicular to both the horizontal axis and to the ground and a horizontal length greater than the height and wherein the cross sectional area varies with the height;(b) a fluidized three phase slurry system within the vessel operating with an internal syngas recycle in a homogeneous flow regime;(c) a synthesis gas inlet at or near the bottom of the reaction vessel for introduction of synthesis gas;(d) more than one gas distributor inside the single stage reactor vessel distributed in a sequential manner along the horizontal axis wherein synthesis feed through the gas distributors may vary;(e) wherein synthesis feed to a first distributor may correspond to fresh syngas feed and its subsequent distributors located inside the same reaction vessel contains mixtures of fresh feed and recycled tail gas;(f) a conduit at or near the top of the reaction vessel for removal of unreacted feed gas, light hydrocarbon products and water;(g) a single set of cooling coils in said reaction vessel to remove heat; and(h) internal draft tubes within said reaction vessel to improve catalyst fluidization.