Aldehyde removal method of pentaerythritol

Abstract

The invention discloses an aldehyde removal method of pentaerythritol. Pentaerythritol condensation liquid is delivered into an aldehyde removal tower through an inlet located at the upper part of the aldehyde removal tower for aldehyde removal, after aldehyde is removed, formaldehyde is discharged from the top of the aldehyde removal tower, and liquid with aldehyde removed is extracted from the bottom of the aldehyde removal tower. Through the method provided by the invention, the best effect of removal formaldehyde can be achieved, so that the aldehyde content of the liquid with aldehyde removed is decreased to below 0.5g / l, and the unit formaldehyde consumption is decreased. A production environment of pentaerythritol is effectively protected, the operation is stable, the quality of pentaerythritol products and a recovery rate of formaldehyde are improved, 4525 tons of formaldehyde can be recycled calculated based on 30000 tons of annual output of pentaerythritol, and the saved formaldehyde can create benefit of about 5200000 yuan every year. The control pressure of the aldehyde removal tower is decreased to 198kPa from 220kPa, the production load of equipment is reduced, the service life of the equipment is prolonged, the maintenance to production equipment and the working strength of workers are reduced, and the work efficiency of workers is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and relates to a pentaerythritol production process, in particular to a pentaerythritol dealdehyde method. Background technique [0002] Pentaerythritol is an important organic chemical intermediate and fine chemical product, and has been widely used in many fields. The production of pentaerythritol goes through condensation, dealdehyde, evaporation, crystallization, centrifugation, drying, packaging and other processes. The function of dealdehyde is to separate the condensation liquid. Formaldehyde and part of water are separated from the top of the tower. At present, the domestic production equipment generally has poor dealdehyde effect, and the content of methanol and formaldehyde in the tower top material is low, which makes the utilization rate of the recovered dilute formaldehyde low. At the same time, the concentration of aldehyde in the mother liquor of the dealdehyde tower is...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the problem of high formaldehyde content in the dealdehyde solution in the existing pentaerythritol dealdehyde method, resulting in high formaldehyde unit consumption, and provides a new pentaerythritol dealdehyde method, which reduces the aldehyde content in the dealdehyde solution to 0.5g / l the following