Energy-saving production method of pentaerythritol

Abstract

The invention belongs to the technical field of production of pentaerythritol, and in particular discloses an energy-saving production method of pentaerythritol. The energy-saving production method of pentaerythritol comprises the following steps: obtaining secondary steam containing alcohol aldehyde and heat at tower top of a dealdehyding tower by using an energy gradient utilization concept, and carrying out gradient utilization of the secondary steam to a dealcoholization tower, an evaporator and a concentrated solution pre-dealdehyding tower to realize the aim of heating the dealcoholization tower, the evaporator, and the concentrated solution pre-dealdehyding tower by using the secondary steam at the tower roof of the dealdehyding tower, so that the energy source is comprehensively utilized; and recycling waste heat so as to heat the to-be-heated material, adding a dealcoholization tower gas phase heat exchanger, a dilute formaldehyde heat exchanger and an alcohol-containing dilute formaldehyde heat exchanger before entering the concentrated solution pre-dealdehyding tower, and increasing the feeding temperature of the concentrated solution pre-dealdehyding tower to 90 DEG C from 60 DEG C through the improvement. The energy-saving production method of pentaerythritol, provided by the invention, realizes one energy source with multiple purposes through series utilization according to the energy grade, the energy source is comprehensively utilized, and thus the energy-saving production of pentaerythritol is finally realized.

Description

technical field [0001] The invention relates to the technical field of pentaerythritol production, in particular to an energy-saving production method of pentaerythritol. Background technique [0002] Pentaerythritol, referred to as PE, is one of the important chemical raw materials. It can be used to make alkyd resins, printing inks, explosives, high-temperature lubricants, plasticizers, surfactants and chlorinated polyether advanced engineering plastics. [0003] At present, the industrial production of pentaerythritol mainly uses formaldehyde and acetaldehyde under the action of alkali metal or alkaline earth metal hydroxide to catalyze condensation and Connizzaro reaction to generate pentaerythritol and formate. The reaction equation of the reaction process is as follows: [0004] [0005] [0006] When above main reaction takes place, also can have the generation of side reaction, side reaction has both consumed raw material, makes the yield and consumption of pe...

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Problems solved by technology

[0006] When above main reaction takes place, also can have the generation of side reaction, side reaction has both consumed raw material, makes the yield and consumption of pentaerythritol increase, also can make the product quality of pentaerythritol decline, therefore, after condensation makes pentaerythritol product , it is also necessary to refine and purify the product to obtain high-purity pentaerythritol

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