Method for synthesizing cyclohexanone dimer by continuous catalytic reaction and distillation

Abstract

The invention discloses a method for synthesizing cyclohexanone dimer by continuous catalytic reaction and distillation. The method comprises the following steps that: a catalytic reaction and distillation device shown in a figure is adopted, and cyclohexanone enters the a tower from the middle part of the tower; a cyclohexanone dimer and water azeotropic mixture obtained by the condensation of overhead vapor is subjected to continuous low layer resultant water separation in a water knockout vessel, and the upper layer cyclohexanone flows into the top of the tower; and tower bottom residue isheated by a reboiler, the temperature of the residue is controlled to be 250 to 280 DEG C, and 60 to 90 mass percent cyclohexanone dimer can be obtained from liquid discharged from the bottom of the tower. The method adopts continuous catalytic reaction and distillation technology and removes water in products away from a reaction field in time, thereby promoting a reaction to move toward the direction of the formation of the cyclohexanone dimer; meanwhile, the method separates the products of the reaction from a stripping section at the lower part to further eliminate the opportunity for theproducts of the reaction to contact a catalyst, thereby improving the selectivity of the cyclohexanone dimer, ensuring continuous reaction, high production efficiency and high selectivity of the cyclohexanone dimer, and facilitating industrial production.

Description

technical field [0001] The invention relates to a compound synthesis method, in particular to a method for continuously catalytic reaction rectification to synthesize cyclohexanone dimer. Background technique [0002] Ortho-phenylphenol (OPP) is an important chemical product, which is widely used in anticorrosion, flame retardant, disinfection and other fields. The production process of OPP with good prospects widely studied at present is a two-step method of dehydration and dehydrogenation of cyclohexanone, that is, cyclohexanone is first dehydrated under the action of a dehydration catalyst to form a dimer of cyclohexanone, and then the dimer is dehydrated under the action of a dehydrogenation catalyst. Under the action of dehydrogenation to generate OPP. The process can be expressed as follows: [0003] [0004] Wherein 2-(1-cyclohexenyl) cyclohexanone (I) and 2-cyclohexylene alkyl cyclohexanone (II) are isomers, all are dimers of cyclohexanone, and it is not necessa...

Images