SU1493295A1 - Device for separating gas mixtures - Google Patents

Abstract

The invention relates to the separation of gas mixtures and can be used to obtain products with a high content of target components in technological processes in chemical, petrochemical, gas processing and other industries. The aim of the invention is to increase the efficiency of the device for the separation of gas mixtures by reducing the energy consumption for gas compression. This goal is achieved by the fact that in a device for separating gas mixtures containing two membrane gas separators, the dividing unit for the flow of gas mixture is made in the form of a membrane module. As a result of using the invention, products with a given concentration of target components can be obtained at lower values of the total compressible flow of the gas mixture, which will provide energy savings for the production of products. 5 hp ff, 2 ill.

Description

The invention relates to the separation of gas mixtures and can be used in the chemical, petrochemical, gas processing and other industries.

The aim of the invention is to increase the efficiency of the device for the separation of gas mixtures by reducing energy costs per gas compression.

FIG. Figure 1 shows a schematic diagram of a device with a flow dividing unit in the form of a material module containing two membranes; figure 2 - the same, containing one membrane.

The device consists of a compressor 1, a membrane module 2 containing membranes 3 and 4 with opposite selective properties, a gas-separator and 5 and 6 with membranes 7 and

8, having opposite relative to each other selective properties. When a module contains two membranes with opposite properties, it can be equipped with a communication 9 for removal of the high pressure cavity short-gas (LDPE) gas mixture.

On the communications connecting the dividing unit of the gas mixture flow to the membrane gas separators, additional compressors 10 can be installed.

Performing the flow dividing unit in the form of a membrane module allows to increase the concentration of the target component at the inlet to each of the membrane gas separators, as the gas separator enters the inlet of the gas separator

x with tc

CD

cl

from the membrane module it is enriched with precisely that component which is difficult to penetrate in relation to the membrane of the gas separator.

The device works as follows.

The flow of the initial gas mixture through the compressor 1 is fed to the PVD of the membrane module 2. Under the action of the differential pressure, the mixture penetrates into both cavities of the low pressure (MHP) module, enriched with the component that is easily penetrating with respect to the membranes 3 and 4, which have opposite selective properties. Thus, mixtures arrive at the inlet of the gas separators, anticipating CO 2 5 10-mol m / m.S.Pa. The permeability coefficients of the membrane (3 and 8) of porous polypropylene in H 5-10-, in CO 2. M / m2.s. Pa. With the separation of FIG. 1 (there are no additional compressors) pressure in PVD and PND module 10 and 5 atm, respectively. 11VD pressure

and PND gas separators 5 and 1 atm, respectively. The split ratio of each of the gas separators is 0.75, the total compressible flow is 4.5 mol / s, the thermodynamic

Efficiency 1 0.19, which is 12% higher than in the known device without a membrane module.

PRI mme R 2. The separation is carried out analogously to example 1. At the inlet

completely enriched by the target components-20 dah installed in the gas separator

tami that are part of these separators. The latter are also equipped with membranes 7 and 8 with opposite selective properties.

Similarly, the device operates, the circuit of which is shown in FIG. 2

The dotted line indicates the possible installation options for compressors and communications.

The proposed device has a large compared with the known thermodynamic EFC, determined according to the ratio

R

d v сЛП F

1 p. Р; (2С - 1) 1п

Din i -

I

WITH

R.

i

C flow and concentration of the target component in the selection flows

F, C-flux and concentration of this component in the initial mixture-, G (- flow at the inlet to the compressor

fT is the compression ratio of the compressor.

Example 1. Separation of a mixture of H at 50 mol.% Concentrations on carbosyl and porous polypropylene membranes.

The flow of the initial mixture is 1 mol / s, the sampling banks are 0.5 mol / s each, and the H to CO 1 concentration in the sampling streams is 95%. The permeability coefficients of the membrane (4 and 7) of carbosil on H p

additional compressors. The pressure in LDPE and PND module and each of the separators is 10 and 1 atm, respectively. The division ratio of the flow of each of the gas separators

5 and 6 is 0.5. The total compressible flow is 4.0 mol / s. Thermodynamic efficiency 1 0.21. I

Example 3. The separation is carried out according to Example 1 of FIG. 2, a membrane 7 of carbosil, a membrane 8 of porous polypropylene. An additional compressor is installed at the output of the PND separator. Pressure

in LDPE and PND module and each of

gas separators 10 and 1 atm, respectively.

The split ratio of the separators is 0.7. Total we compress the 1st flow 4.4 mol / s. Thermodynamic efficiency 1 0.19.

Thus, as a result of using the invention, products with a predetermined concentration of target components can be obtained with less energy consumption.

Claims (6)

Invention Formula 1 Device For separation of gas mixtures, containing two membrane gas separators, the high and low pressure cavities of which are separated by membranes with opposite selective properties, communications for selecting products from the high and low pressure cavities of the gas distributors, the mixing unit, communications connected to it removal of the mixture from the low-pressure gas-gap cavities, the dividing gas flow dividing unit, connected by communication to supply the splittable mixture to the high pressure separator gas cavities, the communication to supply the splittable mixture to the dividing flow section, connected to the mixing unit, the compressor installed on the latter, and communication for supplying the source gas mixture to the mixing unit, characterized in that, in order to increase the efficiency of the device by reducing the energy cost of compressing the gas, the flow dividing unit The membrane module contains one high-pressure cavity and a low-pressure cavity, each of which is separated from the high-pressure cavity by a membrane, communication for supplying a separable mixture to the flow dividing unit is connected to the high-pressure cavity of the module, and each of the communications for supplying separable the mixture in the cavity of high pressure gas separators is connected to one of the cavities of the module. 2. The device according to claim 1, characterized in that the membrane module contains two low pressure cavities, the module membranes have opposite selective properties, and each of the communications for supplying the separable mixture to the gas separators is connected to the low pressure cavity of the module separated 0 five from the cavity of the high pressure of the module with a membrane with selective properties opposite to the membrane of the gas separator. 3. The device according to claim 1, that is, that the membrane module contains one low pressure cavity separated from the high pressure cavity by a membrane, while the selective properties of the membrane module and one of the gas separators coincide, the communication for the supply section The mixture to the high pressure cavity of this gas separator is connected to the high pressure cavity of the module, and the communication for supplying the split mixture to the high pressure cavity of another gas emitter is connected to the low pressure cavity of the module. 4. The device according to claim 1, concerning the fact that the communications for supplying the mixture to be divided into 5, high-pressure cavities of the gas separator are equipped with additional compressors. 5. The device according to claim 2, wherein the module is provided with communication for taking the product out of the high-pressure cavity. 6. The device according to claim 4, characterized in that the additional compressor is installed on one from communications to supply a separable mixture in the cavity of a high pressure of gas separators. 0 0 five Editor I.Ryochenks Compiled by M. Krykin Tehred M. Didyk Proofreader O. Kravtsov FIG. 2