Full-temperature-range pressure swing adsorption gas separation, refinement and purification method

Abstract

The invention discloses a full-temperature-range pressure swing adsorption gas separation, refinement and purification method.By means of the difference of the temperatures and pressures of different raw material gases and the difference of the adsorption separation coefficients and physical chemistry properties of all components in the raw material gases in the temperature range of 80-200 DEG C and the pressure range of 0.03-4.0 MPa, the adsorption or desorption regeneration operation of the pressure swing adsorption circulation process is adjusted by coupling all separation methods, the adsorption theory that the pressure or temperature swing adsorption separation process is only limited to the adsorption and desorption regeneration circulation operation through pressure or temperature changes is expanded, and therefore all raw material gases are separated, refined and purified by achieving the energy gradient utilization in the gas separation, refinement and purification process and achieving the circulation operation, where adsorption, desorption and regeneration are easily matched and balanced, in the moderate to low cold and moderate to high temperature pressure swing adsorption separation process, and it is changed that a traditional adsorption method is only limited to the auxiliary effect of refinement and purification, and adsorption becomes the basic separation unit operation just as important as refinement, absorption and extraction separation.

Description

technical field

[0001] The invention belongs to the field of gas separation, purification and purification, and more specifically relates to a method for separation, purification and purification of gas with full temperature range pressure swing adsorption. Background technique

[0002] Gas separation is to separate the mixture gas containing various components to obtain one or some single components as product gas or to remove one or some single components as purified gas (or qualified exhaust gas), for example, from Separation and extraction of ethylene (C2H4) and propylene (C3H6) from ethylene cracking gas, purification of benzene and naphthalene removal from coke oven gas, recovery of ethylene, ethane and other carbon two and above components (C2 and above) from ethylene and refinery tail gas component), extract product hydrogen (H2) from hydrogen-containing refinery dry gas, extract oxygen (O2) nitrogen (N2) from air, remove hydrogen sulfide (H2S) from hydrogen-rich gas...

Examples

Embodiment 1

[0076] like figure 1 As shown, a full-temperature PSA gas separation, purification and purification method is applied to the purification of coke oven gas for debenzene and naphthalene removal, and the following operations are performed in sequence:

[0077] (1) Pretreatment process, ammonia washing, the coke oven gas output from the coke oven with a temperature of 650~800°C, the temperature after ammonia washing is 60~120°C, the pressure is 0.3-2.8MPa, the coke oven gas 70~75% of the coal tar and part of benzene are condensed, and the tar is about 80~120g / m 3 Reduced to about 35~40g / m 3 , Benzene from 30~45g / m 3 Reduced to 3~3.5g / m 3 Below, naphthalene ranges from 8 to 12g / m 3 down to 0.8g / m 3 the following.

[0078] (2) Medium-temperature pressure swing adsorption concentration process: coke oven gas washed with ammonia enters the pressure swing adsorption system for adsorption, 8 adsorption towers are connected in series, alternately cycled, the operating temperature ...

Embodiment 2

[0089] like figure 2 As shown, a full-temperature PSA gas separation, purification and purification method is applied to the separation and purification of ethylene cracking gas, and the following operations are performed in sequence:

[0090] (1) Pretreatment process: perform initial cooling, compression, drying, and alkali washing in sequence, lower the temperature to 80-200°C, adjust the pressure to 0.3-2.8MPa, and remove heavy oil and heavy hydrocarbons during the initial cooling process.

[0091] (2) Medium and high temperature pressure swing adsorption concentration process: the pretreated raw material gas enters the pressure swing adsorption system for pressure swing adsorption. The pressure swing adsorption system is composed of 10 adsorption towers connected in series. ~200℃, pressure 0.3-2.8MPa, to obtain intermediate gas and concentrated gas, the intermediate gas flows out from the top of the adsorption tower, the intermediate gas is mainly composed of non-polar an...

Embodiment 3

[0097] like image 3 As shown, a full-temperature PSA gas separation, purification and purification method is applied to the field of hydrogen-rich gas source removal of H2S, and the following operations are performed in sequence:

[0098] (1) Medium-temperature pressure swing adsorption concentration process: the hydrogen-rich gas with a flow rate of less than 1000-10,000 standard cubic meters per hour, a temperature of 50-150°C, and a H2S concentration of 4-10% is used as the raw material gas to enter the pressure swing adsorption system through the intake pipe Pressure swing adsorption is carried out in the medium, using 6 towers in series or parallel process, alternate cycle operation, operating temperature is 50~150 ℃, after the adsorption is completed, an intermediate gas containing a small amount of hydrogen sulfide is obtained, and after vacuum desorption, a concentrated gas rich in hydrogen sulfide is obtained.

[0099] (2) Intermediate gas treatment process: The inte...

technical field

[0001] The invention belongs to the field of gas separation, purification and purification, and more specifically relates to a method for separation, purification and purification of gas with full temperature range pressure swing adsorption. Background technique

[0002] Gas separation is to separate the mixture gas containing various components to obtain one or some single components as product gas or to remove one or some single components as purified gas (or qualified exhaust gas), for example, from Separation and extraction of ethylene (C2H4) and propylene (C3H6) from ethylene cracking gas, purification of benzene and naphthalene removal from coke oven gas, recovery of ethylene, ethane and other carbon two and above components (C2 and above) from ethylene and refinery tail gas component), extract product hydrogen (H2) from hydrogen-containing refinery dry gas, extract oxygen (O2) nitrogen (N2) from air, remove hydrogen sulfide (H2S) from hydrogen-rich gas...

Examples

Embodiment 1

[0076] like figure 1 As shown, a full-temperature PSA gas separation, purification and purification method is applied to the purification of coke oven gas for debenzene and naphthalene removal, and the following operations are performed in sequence:

[0077] (1) Pretreatment process, ammonia washing, the coke oven gas output from the coke oven with a temperature of 650~800°C, the temperature after ammonia washing is 60~120°C, the pressure is 0.3-2.8MPa, the coke oven gas 70~75% of the coal tar and part of benzene are condensed, and the tar is about 80~120g / m 3 Reduced to about 35~40g / m 3 , Benzene from 30~45g / m 3 Reduced to 3~3.5g / m 3 Below, naphthalene ranges from 8 to 12g / m 3 down to 0.8g / m 3 the following.

[0078] (2) Medium-temperature pressure swing adsorption concentration process: coke oven gas washed with ammonia enters the pressure swing adsorption system for adsorption, 8 adsorption towers are connected in series, alternately cycled, the operating temperature ...

Embodiment 2

[0089] like figure 2 As shown, a full-temperature PSA gas separation, purification and purification method is applied to the separation and purification of ethylene cracking gas, and the following operations are performed in sequence:

[0090] (1) Pretreatment process: perform initial cooling, compression, drying, and alkali washing in sequence, lower the temperature to 80-200°C, adjust the pressure to 0.3-2.8MPa, and remove heavy oil and heavy hydrocarbons during the initial cooling process.

[0091] (2) Medium and high temperature pressure swing adsorption concentration process: the pretreated raw material gas enters the pressure swing adsorption system for pressure swing adsorption. The pressure swing adsorption system is composed of 10 adsorption towers connected in series. ~200℃, pressure 0.3-2.8MPa, to obtain intermediate gas and concentrated gas, the intermediate gas flows out from the top of the adsorption tower, the intermediate gas is mainly composed of non-polar an...

Embodiment 3

[0097] like image 3 As shown, a full-temperature PSA gas separation, purification and purification method is applied to the field of hydrogen-rich gas source removal of H2S, and the following operations are performed in sequence:

[0098] (1) Medium-temperature pressure swing adsorption concentration process: the hydrogen-rich gas with a flow rate of less than 1000-10,000 standard cubic meters per hour, a temperature of 50-150°C, and a H2S concentration of 4-10% is used as the raw material gas to enter the pressure swing adsorption system through the intake pipe Pressure swing adsorption is carried out in the medium, using 6 towers in series or parallel process, alternate cycle operation, operating temperature is 50~150 ℃, after the adsorption is completed, an intermediate gas containing a small amount of hydrogen sulfide is obtained, and after vacuum desorption, a concentrated gas rich in hydrogen sulfide is obtained.

[0099] (2) Intermediate gas treatment process: The inte...

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