The way the adsorption drying gas

 

(57) Abstract:

The invention relates to a method of adsorption air drying, hydrocarbon and inert gases using sorbents and can be used in gas, oil, refining and petrochemical industries. The way the adsorption drying gas includes sorption of moisture granular solid, porous sorbent and its subsequent regeneration. Sorption provide a porous sorbent with a bulk density of 0.45-0.55 g/cm3made of a copolymer of styrene and divinylbenzene, the pores of which pre-saturate up to 30-35% polyester. The use of this invention allows to increase the efficiency of the drying process and to increase the service life of the sorbent. 2 C.p. f-crystals, 1 Il.

The invention relates to the processing gas, and in particular to methods adsorption air drying, hydrocarbon and inert gases using sorbents, and can be used in gas, oil, refining and petrochemical industries.

There is a method of drying gas (Series "Preparation and processing of gas and gas condensate, vol. 1, "the Technology of drying compressed gas, used as the 5. Hydrocarbon gas at a pressure of 2.0 - 5.5 MPa and at a temperature of 25 - 30oC enters the upper part of the canister, filled with the zeolite. The temperature of the regeneration of the zeolite 340 - 350oC. the bulk density of the zeolite 0,790 - 0,860 g/cm3. Drained gas with a dew point of not higher than minus 70oC goes from the bottom of the canister and sent for further use. Maximum dynamic capacity of the zeolite is 16 wt.%.

The disadvantage of this method is the low adsorption capacity and a shorter lifetime of the zeolite due to the rapid decrease of the adsorption capacity.

The closest in technical essence and the achieved effect to the proposed method is a method of drying gases (patent of Russian Federation N 2030199, 1990, MKI 6: B 01 D 53/02), including the adsorption of moisture granular zeolite NaA with a bulk density 0,650 - 0,750 g/cm3and pore volume 0,220 - 0,250 cm3/g, and the adsorption is carried out at a temperature of 40 - 60oC, and the subsequent regeneration of the saturated zeolite are blowing heated gas at a temperature of 280 - 310oC.

The disadvantage of this method is the low adsorption capacity, a shorter lifetime of the zeolite due to the fall of also ysenia efficiency of the process gas drying by increasing the capacity of the sorbent and lowering the temperature of regeneration.

This objective is achieved in that in the method the adsorption drying gas including the moisture sorption granular solid, porous sorbent and its subsequent regeneration, the sorption provide a porous sorbent with a bulk density of 0.45 - 0.55 g/cm3made of a copolymer of styrene and divinylbenzene, the pores of which pre-saturate up to 30 - 35% polyester, and regeneration of the sorbent is carried out at a temperature of 120 - 80oC dry gas or regenerated polyester at a temperature of absorption.

The implementation of the claimed method of adsorption by porous sorbent with a bulk density of 0.45 - 0.55 g/cm3made of a copolymer of styrene and divinylbenzene, the pores of which are pre-saturated up to 30 - 35% of polyester and regeneration of the sorbent at a temperature of 120 - 80oC dry gas or regenerated polyester at a temperature of absorption, reduced energy costs of the process gas drying by 25% and increase the adsorption cycle by 20 - 30%.

The applicant does not know the ways of drying gas, in which the goal was achieved in this way.

The figure shows the flow chart of installation adsorbtion is desorbcii, with fittings supply of raw gas 2, exit dry gas 3 and placed in it a layer of sorbent 4, the adsorber 1', operating in the regeneration mode, with fitting feed drained heated gas 3' and the outlet fitting saturated gas stream 2' and heater dry gas 5.

The gas drying method is implemented as follows.

Raw hydrocarbon gas is fed into the adsorber 1 through the nozzle feeder 2 and is directed to the layer of sorbent 4 with a bulk density of 0.45 - 0.55 g/cm3made of a copolymer of styrene and divinylbenzene, the pores of which are pre-saturated up to 30 - 35% of polyester. The amount of sorbent granules of 0.8 - 2.5 mm Contact of the gas with the adsorbent is carried out at the temperature of the gas 40oC. Drained the gas away from the bottom of adsorber 1 through the outlet fitting dry gas 3 in the quality of the finished product. Regeneration of the sorbent is carried out at a temperature of 120 - 80oC dry gas or regenerated polyester at a temperature of absorption in the absorber 1', operating in the regeneration mode, which stops the flow in the adsorber 1', raw hydrocarbon gas through the nozzle 2' and served dried and preheated in the preheater dry gas 5 gas through the nozzle 3' and deduce saturated flow through PCs', switching thereby adsorber 1' in the mode of adsorption. In this way carry out, if necessary, the regeneration of the adsorber 1, which is connected in parallel to the adsorber 1'. Regeneration can be regenerated polyester, for example, concentration equal to 99 wt.%, served on the sorbent at a temperature of absorption.

The proposed method is the adsorption drying gas was tested in real conditions.

Example. Raw hydrocarbon gas at operating pressures of 1.6 to 4.6 MPa and the temperature of the gas 4 - 10oC serves to the top of the adsorber filled with an adsorbent made of a copolymer of styrene and divinylbenzene, the pores of which are pre-saturated up to 30 - 35% of polyester. The sorbent has a bulk density of 0.45 - 0.55 g/cm3. Linear gas flow rate of 0.15 - 0.2 m/s the temperature of the adsorption support-level 4 - 40oC, and regeneration 120 - 80oC. From the bottom of adsorber get drained gas with a dew point of minus 37,5oC to minus 43oC (in terms of pressure of 55 atmospheres.) and sent for further processing. The duration of the adsorption cycle from 20 to 40 hours. Before moving on to the regeneration mode, the duration of the regeneration cycle is primer who I am in the process of work and can be used for 3 - 5 years. Low temperature regeneration eliminates coking pores of the sorbent.

Using the proposed method, the adsorption drying gas can improve the efficiency of the process gas drying by increasing the capacity of the sorbent and lowering the temperature of regeneration and to increase the service life of the sorbent due to less evaporation and lower temperature regeneration excluding coking pores of the sorbent.

1. The way the adsorption drying gas including the moisture sorption granular solid, porous sorbent and subsequent regeneration, characterized in that the sorption provide a porous sorbent with a bulk density of 0.45 - 0.55 g/cm3made of a copolymer of styrene and divinylbenzene, the pores of which pre-saturate up to 30 - 35% polyester.

2. The method according to p. 1, characterized in that the regeneration of the sorbent is carried out at a temperature of 120 - 80oC dry gas.

3. The method according to p. 1, characterized in that the regeneration is carried out recycled polyester at a temperature of absorption.

 

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