Slurry bed loop reactor and use thereof

A slurry bed loop reactor comprising a riser and at least one downcomer (3), wherein two ends of the riser are connected to two ends of each downcomer (3) respectively via line (16) and line (7);

• the riser comprises a reaction section (1) and a settling section (2) with an increased tube diameter disposed on the reaction section (1);
• a gas outlet (13) exists at the top of the settling section (2);
• each of the downcomers (3) is divided into a filtrate section (5) and a slurry section (6) by a filter medium (4), wherein the filtrate section (5) is connected to a liquid outlet (10), and two ends of the slurry section (6) are respectively connected to two ends of the riser,
• wherein the settling section (2) has a baffle disposed approximately in the vertical direction;
• wherein the distance between the upper edge of said baffle and the top of the settling section is 1/10- 9/10 of the total height of the settling section;
• wherein the section above the upper edge of the baffle in the settling section is a gas-liquid separation section, and the section below the upper edge of the settling section is divided into a turbulence section (20) and a steady flow section (19) by said baffle;
• wherein said turbulence section (20) is adjacent to and directly communicated to the reaction section (1), and the bottom of said steady flow section (19) is in liquid communication to the reaction section (1) via hole(s) (18) or fluid guide pipe(s) (17);
• and
• wherein the downcomer is connected via line (16) to the riser at the upper part of the steady flow section, and the position at which the line (16) is connected to the steady flow section ranges from 1/10 to 9/10 of the vertical distance between the upper edge of said baffle and the position at which hole(s) (18) or fluid guide pipe(s) (17) is connected to the baffle.