Pretreatment method for preventing deactivation of diphenol propane synthesis reaction catalyst

Abstract

The invention relates to a pretreatment for avoiding the inactivity of assist catalyst in the 2-phenol dimethylmethane compose reaction. Wherein, it comprises first feeding 2-phenol dimethylmethane into pretreater with H-type anode exchange resin, to remove the material that inactivates the catalyst; then feeding the reacted mixture into the assist catalyst reactor to compose. The invention uses H-type anode exchange resin as pretreater to remove the foreign materials as methanol or metal ion to reduce the inactivate speed of assist catalyst and improve the activity of catalyst to reduce the cost. Therefore, it can avoid stopping compose reaction for long time, to reduce cost and improve the yield.

Description

technical field [0001] The invention relates to a pretreatment method before the production of diphenol-based propane, more specifically, the present invention relates to a pre-treatment method for preventing co-catalyst deactivation during the production of diphenol-based propane. Background technique [0002] In the prior art, when the catalytic method is used to synthesize diphenol-based propane, the cation exchange resin method is adopted, and a large amount of cation exchange resin is required as a catalyst. As the catalyst is used for a long time, the reduction of its reactivity is not easy to be seen. The co-catalyst process developed on the basis of the cation exchange resin process has high catalytic selectivity and high conversion rate. Therefore, the number of co-catalysts required is greatly reduced, and the consumption of raw materials is lower and the product quality is better. However, the disadvantage of the catalytic promotion process is that it is easily po...

AI Technical Summary

Problems solved by technology

However, the disadvantage of the catalytic promotion process is that it is easily poisoned by some impurities in the reaction liquid, resulting in a decrease in the reaction rate, affecting the output of the device, and resulting in a short service life; and the price of the catalytic promoter is relatively high.

[0003] At present, in the catalytic promotion process, methanol and metal ions such as Fe, Na, Ca, Mg, Al, Cr, Cu, Mn, Ni, Zn will have a high concentration because they are not controlled, among which methanol mainly comes from the raw material acetone; metal ion Fe , Na, Ca, Mg, Al, Cr, Cu, Mn, Ni, Zn come from raw materials such as phenol, deionized water, pipeline equipment materials, etc. These impurities can easily cause poisoning of the co-catalyst in the upper part of the reactor, resulting in a decrease in the reaction rate and affecting the output

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