Novel method for concentration-improving alcohol removing of alcohol-containing thin formaldehyde solution

Abstract

The present invention discloses a novel method by concentrating the diluted formaldehyde solution containing alcohol and eliminating the alcohol, belonging to the technological field of the concentration and elimination of the alcohol of the diluted formaldehyde solution containing alcohol; the diluted formaldehyde solution containing alcohol with the alcohol of 0.5 to 15 percent and the aldehyde of 1 to 30 percent is sent into the pressurization and rectification tower for rectification; the product with the formaldehyde concentration of 1.5 to 65 percent can be got on the top of the pressurization and rectification tower; the product on the bottom of the tower is the organic wastewater; the products on the top of the pressurization and rectification tower are sent to the heat exchanger and are cooled to be at the temperature between 80 and 120 DEG C; then the products are sent to the alcohol-doffing tower for the continuous rectification; the methanol solution with the concentration of 40 to 80 percent can be got on the top of the alcohol-doffing tower; the formaldehyde solution with the concentration of 2 to 67 percent can be got on the bottom. The present invention is of the large output and the high rectification efficiency; the formaldehyde can be diluted to have the concentration of the conventional formaldehyde product; at the same time, the separated methanol can be recycled used for the formaldehyde production and so on.

Description

technical field [0001] The invention discloses a new method for concentrating and removing alcohol from an alcohol-containing dilute formaldehyde solution, and belongs to the technical field of concentrating and removing alcohol from an alcohol-containing dilute formaldehyde solution. Background technique [0002] At present, the treatment of dilute formaldehyde is firstly used to produce urotropine, but urotropine is far from being able to consume the dilute formaldehyde by-produced in the production of formaldehyde downstream products; the other is to carry out secondary vacuum concentration, but still have to produce concentration Lower dilute formaldehyde; the third is direct emission, which seriously pollutes the environment. In the production of high-concentration formaldehyde required by some formaldehyde downstream products (such as paraformaldehyde), the methods used are all vacuum concentration, which will inevitably produce a large amount of dilute formaldehyde so...

AI Technical Summary

Problems solved by technology

[0002] At present, the treatment of dilute formaldehyde is firstly used to produce urotropine, but urotropine is far from being able to consume the dilute formaldehyde by-produced in the production of formaldehyde downstream products; the other is to carry out secondary vacuum concentration, but still have to produce concentration Lower dilute formaldehyde; the third is direct emission, which seriously pollutes the environment

In the production of high-concentration formaldehyde required by some formaldehyde downstream products (such as paraformaldehyde), the methods used are all vacuum concentration, which will inevitably produce a large amount of dilute formaldehyde solution. The treatment of these dilute formaldehyde is more difficult and will cause Leading to too long process and increased cost investment