Abstract: A workpiece changing system capable of automatically changing a heavy workpiece using a robot. A jig for attaching a workpiece thereto is mounted on a jig mounting device. The jig mounting device comprises a jig mounting unit having a rotary member and a swing member. The rotary member rotates the jig and the workpiece on the jig and hold them at a desired rotary position. The tilting member swings around an axis to tilt the jig and the workpiece on the jig and hold them at a desired tilting position. As the jig and the workpiece on the jig can take a suitable orientation or posture for being handled by the handling robot, the handling robot can hold a heavy workpiece without exerting excessive load on the robot wrist.

Abstract: A workpiece changing system capable of automatically changing a heavy workpiece using a robot. A jig for attaching a workpiece thereto is mounted on a jig mounting device. The jig mounting device comprises a jig mounting unit having a rotary member and a swing member. The rotary member rotates the jig and the workpiece on the jig and hold them at a desired rotary position. The tilting member swings around an axis to tilt the jig and the workpiece on the jig and hold them at a desired tilting position. As the jig and the workpiece on the jig can take a suitable orientation or posture for being handled by the handling robot, the handling robot can hold a heavy workpiece without exerting excessive load on the robot wrist.

Abstract: p-Chloroalkylbenzene is selectively produced by chlorinating an alkylbenzene in the presence of a phenoxthine compound having the formula ##STR1## wherein X.sub.1, X.sub.2, X.sub.3 and X.sub.4 are the same or different and respectively represent hydrogen atom; an electron attractive group or an electron donative group and a Lewis acid or its precursor as a catalyst.The process for producing a p-chloroalkylbenzene can be repeatedly carried out by separating the resulting a p-chloroalkylbenzene and adding a hydrogen halide to the residual mixture containing the catalyst to activate the catalyst and chlorinating a newly added alkylbenzene.