Preparation method of 1,1'-sulfonyl bis(4-(2-propylene)oxy benzene)

Abstract

The invention relates to improvement of a preparation method for synthesizing 1,1'-sulfonyl bis(4-(2-propylene)oxy benzene) by taking 4,4'-dihydroxydiphenylsulfone and chloropropene as raw materials. The invention is characterized in that a reaction is carried out in an alkali aqueous solution, a phase transfer catalyst and a potassium iodide catalyst are added in the reaction, the mol ratio of reaction raw materials is that the ratio of 4,4'-dihydroxydiphenylsulfone: chloropropene: alkali is equal to 1: (2.0-2.4): (2.0-4.0), the weight ratio of the phase transfer catalyst to 4,4'-dihydroxydiphenysulfone is (0.003-0.03): 1, the mol ratio of potassium iodide to chloroproene is (0.006-0.03)-1. The invention has the advantages that: the reaction temperature is low, required to be 30-65 DEG Conly; the reaction time is reduced, required to be 3-4.5 hours only; the yield is higher than 93%; the product purity is higher than 99%; the reaction requires no condenser for condensation to prevent chloropropene from escaping by gasification; the reaction safety is high; and the equipment investment is low.

Description

technical field [0001] The present invention is an improvement to the preparation method for synthesizing 1,1'-sulfone-based bis[4-(2-propene)oxybenzene] with 4,4'-dihydroxydiphenyl sulfone and allyl chloride as raw materials, and particularly relates to a The preparation method has low reaction temperature, short reaction time and high product purity and yield. Background technique [0002] 1,1'-sulfone-based bis[4-(2-propenyl)oxybenzene] has many uses, such as the color developer of thermosensitive recording materials, the raw material of polymer flame retardants and the polymer heat-resistant materials raw material. [0003] U.S. Patent No. 4,596,997 discloses that 4,4'-dihydroxydiphenyl sulfone reacts with allyl halides in a solvent to prepare 1,1'-sulfone-based bis[4-(2-propene)oxybenzene], which can also be Speed ​​up the reaction by adding a phase transfer catalyst. The disadvantage of this method is that the used solvent may contain organic solvents, which will le...

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Problems solved by technology

However, because the boiling point of chloropropene is only 44.6°C, when the reaction temperature is 70-90°C, a large-capacity condenser must be used to prevent the chloropropene from vaporizing and escaping. At the same time, the high reaction temperature also increases energy consumption; The use of organic alcohol solvents to dissolve the raw material 4,4'-dihydroxydiphenyl sulfone also requires solvent recovery, which increases production costs; moreover, the reaction time for this preparation is relatively long, reaching 5 to 8 hours, which affects production efficiency