Abstract:
This disclosure relates generally to low temperature steam stripping methods for byproduct polymer and solvent separation from an ethylene oligomerization process. The methods disclosed have been found to separate byproduct polymer from solvent without fouling process equipment or causing other process problems. The byproduct polymer ends up as flowable solid particles in a water stream that may be easily discharged from the process, while solvent is recovered for recycle to the process. In embodiments of the invention, over 90 wt% of the solvent used is recovered and the discharged byproduct polymer is less than 20 wt% solvent.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing aryl-, heteroaryl- or alkenyl-substituted unsaturated hydrocarbons, in which the aryl-, heteroaryl- or alkenyl-substituted unsaturated hydrocarbons can be produced in high yield even on an industrially large scale by a coupling reaction of aryl halides, heteroaryl halides or alkenyl halides with alkynes or alkenes in the presence of a palladium catalyst.SOLUTION: The method for producing aryl-, heteroaryl- or alkenyl-substituted unsaturated hydrocarbons comprises the steps of: reacting the aryl halides, heteroaryl halides or alkenyl halides with alkynes or alkenes in the presence of the palladium catalyst to obtain a crude product; and distilling/purifying the crude product in the presence of a compound having at least one NC=S group.
Abstract:
PROBLEM TO BE SOLVED: To provide an improved method for producing an alkylaromatic compound that results in lower levels of a residual unreacted aromatic compound and an alkylating agent in the final product.SOLUTION: This method of production includes: (1) a process of alkylating the aromatic compound by using the alkylating agent and a catalyst to produce an effluent stream containing the alkylaromatic compound and unreacted materials; (2) a process of heating the effluent stream; (3) a process of stripping the effluent stream in a stripping device in the presence of steam; (4) a process of separating a stripping stream from the stripping device (the stripping stream is rich in the unreacted materials); and (5) a process of separating a product stream from the stripping device (the product stream is rich in the alkylaromatic compound).