SU1353477A1 - Method of desorption of solvents from activated carbon - Google Patents

Abstract

The invention relates to a technology for the desorption of solvents from activated carbon used in the chemical, medical, and food industries and allowing the process to be energy intensively reduced. The desorption of dithyl ether or toluene from an activated carbon is carried out by heating with an electromagnetic field of ultrahigh frequency, for example, 2.45 GHz in a pulsed mode at pulse repetition frequencies of 20-100 Hz, heating intensity of pulses 1-10 W / g of coal, heating temperature. coal is not maintained at 120-150 & C, while a gaseous carrier, for example, nitrogen, is also supplied in a pulsed mode with an amplitude of pressures of 1–5 atm in phase with heating pulses. The degree of desorption of 90% is achieved with a specific energy consumption of 1.4-3.75 kW / kg of product. 1 tab. (L 00 el 00 4 1

Description

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11353477

The invention relates to an adsorption technique, in particular to the desorption and recovery of organic solvents, and can be used in the chemical, medical and food industries, for example, in the production of feed vitamin supplements for animal husbandry.

The aim of the invention is to reduce the energy intensity of the process.

Example. Solvent vapors, in particular diethyl ether, with a concentration of 0.5-2.0 g / m, are fed to the bottom of the sorption column filled with granulated activated carbon of the AR-B brand with a granule diameter of 3-4 MM. The diameter of the column is 50 mm, the height of the sorbent layer is not less than 250 mm. After saturating the activated carbon with 50 g diethyl ether vapor, the column is disconnected from the reaction apparatus and the sorbent is heated for a long time. tal pulses of energy microwave frequency of 2.45 Hz and a specific power of 10 W / g (amplitude value) in those- .0

15

20

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cooled with brine at a temperature of at least minus 20 ° C. At this temperature, 10% of the solvent is carried off in the form of saturated vapors. Thus, out of 50 g, 40.5 g of solvent can be recovered.

Examples of the method of desorption of toluene and diethyl ether by the electromagnetic field of the microwave from activated carbon are given in the table.

It follows from the table that the lowest energy consumption of 1.4 kW / kg of the product, ensuring a desorption rate equal to 90%, is achieved at a repetition rate of 50 Hz pulses. At the same time, with a repetition frequency of 20 and 100 Hz, it is possible to select such pulse parameters that provide lower power consumption in comparison. with a known device, where the energy consumption is 4.0 kW / kg product.

Claims (1)

Formula invention 1 minute to 120 ° C. Simultaneously through activated carbon permeation; A method for desorbing solvents from the lowest possible rate of activated carbon, which turns on nitrogen with pressure pulses with an amplitude of coal heating by an electromagnetic field of 5 atm. This combination provides — pulsed mode and removal of the stripper — preventing the formation of spark gases and inert gaseous media, the discharges between sorbent granules. characterized in that. Further, the duration of microwave pulses is reduced by 8–10 times in order to reduce energy consumption in order to prevent it, it is super-superheated by overheating of the coal above 150 ° C and an air field at a repetition frequency affect the sorbent for 60 minutes . pulses of 20-100 Hz, intensity. As a result of exposure, 90% of solvent is desorbed, i.e. from 50 g of absorbed diethyl ether, 45 g can be desorbed. The desorbed diethipic ether is sent to the refrigerator by a stream of nitrogen and heating pulses of 1-10 W / g coal, the heating temperature of the coal is not 120-150 ° C, while the carrier is also supplied in a pulsed mode with an amplitude of pressure of 1-5 atm in phase with the heating pulses. O five 0 five cooled with brine at a temperature of at least minus 20 ° C. At this temperature, 10% of the solvent is carried off in the form of saturated vapors. Thus, out of 50 g, 40.5 g of solvent can be recovered. Examples of the method of desorption of toluene and diethyl ether by the electromagnetic field of the microwave from activated carbon are given in the table. It follows from the table that the lowest energy consumption of 1.4 kW / kg of the product, ensuring a desorption rate equal to 90%, is achieved at a repetition rate of 50 Hz pulses. At the same time, with a repetition frequency of 20 and 100 Hz, it is possible to select such pulse parameters that provide lower power consumption in comparison. with a known device, where the energy consumption is 4.0 kW / kg product. Formula invention  The method of desorption of solvents from activated carbon, which includes heating the coal by an electromagnetic field in a pulsed mode and removing the desorbing with an inert gaseous carrier, characterized in that. in order to reduce the energy intensity of the process, it is driven by a superhigh-frequency field at pulse repetition rates of 20-100 Hz, heating pulses of 1-10 W / g coal, the heating temperature of the coal is not 120-150 ° C, while the carrier is also supplied in a pulsed mode with an amplitude of pressure of 1-5 atm in phase with the heating pulses.