Ionic liquid modified silica gel loaded aluminum chloride catalyst

Abstract

The invention provides an ionic liquid modified silica gel loaded aluminum chloride catalyst for catalytic preparation of dichlorophenylphosphine. The preparation method comprises the following stepsof: a, uniformly mixing and stirring ionic liquid and silica gel, performing heating to 100-150DEG C, keeping the temperature, performing stirring for 1-2h, then conducting cooling to room temperature, and precipitating, filtering and drying the solid to obtain ionic liquid modified silica gel; and b, adding the ionic liquid modified silica gel obtained in the step a into ethanol, adding aluminumchloride under stirring, continuously performing stirring for 1-2h, removing ethanol under reduced pressure, heating the mixture to 120-160DEG C under the protection of nitrogen, and carrying out reaction for 5-10h to obtain yellow powder. The prepared catalyst has stable properties and high reaction activity, a high product yield (90% or above) can be achieved by using a very small amount of a catalyst in the preparation process of dichlorophenylphosphine, post-treatment of the catalyst is simple, the catalyst can be removed from the system only through filtration, and the catalyst can be reutilized after drying.

Description

technical field [0001] The invention relates to the field of organic synthesis, in particular to a liquid modified silica gel supported aluminum chloride catalyst and the use of the catalyst in preparing phenylphosphine dichloride. Background technique [0002] Phenyl dichloride phosphine (DCPP), also known as phenyl phosphine dichloride, is one of the most important monomers for the synthesis of aromatic organic phosphine compounds. It is also used for the preparation of flame retardants, plasticizers, pesticides, nylon stabilizers, Intermediates of dyes and photoinitiators. Among them, phosphine-based reactive flame retardants prepared from phenylphosphine dichloride are widely used in the preparation of permanent flame-retardant products from polyester resins. [0003] At present, the synthetic method of phenylphosphine dichloride mainly contains following several kinds: [0004] (1) Aluminum trichloride catalytic method. With aluminum trichloride as catalyst, benzene ...

AI Technical Summary

Problems solved by technology

However, the reaction needs to be carried out under high temperature and high pressure. Phosphorus trichloride is highly corrosive, and the requirements for reaction equipment are relatively high.