Method for dehydrating gas-phase material flow in production process of polymethoxyl dimethyl ether

Abstract

The invention discloses a method for dehydrating a gas-phase material flow in the production process of polymethoxyl dimethyl ether. The method comprises the following steps: feeding feed gas of the gas-phase material flow through the top of a first-stage adsorption tower, and carrying out adsorption reaction in the first-stage adsorption tower; entering a regeneration stage after completing adsorption through a molecular sieve in the first-stage adsorption tower, and feeding the feed gas of the gas-phase material flow in a second-stage adsorption tower to carry out adsorption reaction; entering an adsorption state again after completing regeneration through the first-stage adsorption tower; entering the regeneration state after completing adsorption through the second-stage adsorption tower; and circulating the above steps till the moisture content in the feed gas of the gas-phase material flow meets requirements. By adopting the above process, the moisture content of a polymethoxyl dimethyl ether rectifying gas-phase material flow is controlled below 0.05%; simultaneously, on the premise of ensuring the adsorption quality, the energy consumption can also be effectively reduced; the utilization rate of an adsorbent is increased; a stripping liquid returns to previous production workshop sections; no pollutant is discharged; and the continuity of the whole workshop section production is ensured.

Description

technical field [0001] The invention relates to the field of polyoxymethylene dimethyl ether production, in particular to a gas-phase material flow dehydration method in the production process of polyoxymethylene dimethyl ether. Background technique [0002] Polyoxymethylene dimethyl ether (referred to as PODE or DMMn), also known as polyoxymethylene dimethyl ether, polyoxymethylene dimethyl ether, polyoxymethylene formal, is a class of dimethoxymethane as the matrix, Low molecular weight acetal polymer with methyleneoxy as the main chain, its general formula is expressed as CH 3 (CH 2 O) nCH 3 , where n is an integer equal to or greater than 1, generally less than or equal to 8. Polyoxymethylene dimethyl ether is a colorless or light yellow volatile and flammable liquid with a slight ether odor. It is a downstream product of methanol. The main production method is from compounds that provide paraformaldehyde (formaldehyde, paraformaldehyde, paraformaldehyde, etc.) and c...

AI Technical Summary

Problems solved by technology

This patent only provides a device structure, and does not give specific process conditions. According to this device structure, those skilled in the art cannot actually achieve the desired effect of the device structure. Such a dehydration device is in the field. In fact, it is relatively common, and those skilled in the art know that process conditions are a very important design link. For different dehydration objects, different process flows and process conditions are required. These are not based on experience or A limited number of trials can obtain

In addition, the disclosed methylal deep dehydration purification device is mainly used to treat methylal, and the water content of methylal is very low, about 0.5%, which is very easy for the molecular sieve itself. If it is controlled below 0.05%, such a dehydration purification device does not have any reference value for the gas phase material flow with a large water content

Images