SU806080A1 - Method of cleaning natural gases from water vapours and petrol hydrocarbons - Google Patents

Description

. (54) METHOD FOR CLEANING NATURAL GAS FROM WATER VAPORS AND PETROL CARBONS

Example 1. A adsorber is charged with 0.55 kg of medium porous silica gel with an average pore radius of 72 A, then 1.35 kg of finely porous cellulose and 0.8 kg of medium porous silica gel with an average radius of 72 pores. Thermal activation of the adsorbents is carried out at 220 ° C, natural gas with a dew point for water and gasoline hydrocarbons of 18 ° C passes for 5 h. After the adsorber is cooled to a normal temperature, a smaller amount of silica gel passes through the adsorbent bed to a cleaned natural gas with a water dew point of 5 ° WITH and for gasoline hydrocarbons 18 ° C at an adsorption pressure of 60 atm. With a gas flow rate of 0.2 per 1 kg of sorbent, a temperature of 18 ° C and a contact time of 45 minutes, the dew point on water for a purified gas is -25 ° C, and on gasoline hydrocarbons -10 ° C.

Example 2. 0.8 kg of medium porous silica gel, 2.2 kg of finely porous natural bentonite yna, and 0.8 kg of medium porous silica gel are loaded into the adsorber layer by layer. After the adsorber is heated to 250 ° C, 130 m of natural gas saturated at 20 ° C with water vapor and gasoline hydrocarbons is passed through it for 10 hours. After the adsorber is cooled to 20 ° С, purified gas is passed through it at an adsorption pressure of 60 atm. With a gas flow rate of 0.2 per 1 kg of sorbent, a temperature of 20 ° C and a contact time of 45 minutes, the dew point of the purified gas for water is -40 ° C and for gasoline hydrocarbons -13 ° C.

Example 3. 0.05 kg of medium-porous acid-activated bentonite clay, 0.20 kg of natural fine-porous bentonite clay and 0.15 kg of medium-porous acid-activated clay are loaded into the adsorber. Thermal activation of a three-layer sorbent is carried out at 200 ° C, passing through it for 5 hours 5 m of natural gas, saturated under normal conditions with water vapor and gasoline hydrocarbons. Then the adsorber is cooled; and pass through it under pressure of 60 atm from the loading side of 0.05 kg of acid-activated clay purified natural gas with water dew point

5 ° C and petrol hydrocarbons. At a gas flow rate of 0.2, purified natural gas with a dew point in water is obtained after 45 minutes of contact with 1 kg of sorbent.

-30 ° С and on gasoline hydrocarbons -14 ° С. The adsorber is heated to 200 ° C and 0.35 m of natural gas is passed through it for 30 minutes. After the adsorber has cooled, the adsorption-regeneration cycle is repeated.

After 86 cycles of adsorption — regenerating the dew point of the purified gas through water –27 ° C and hydrocarbons –8 ° C.

The table presents comparative data on the efficiency of purification of natural

s gas by known and proposed methods with an adsorption pressure of 60 atm, a temperature of 18 ° C, a gas velocity of 0.2 per I kg of sorbent.

As follows from the above data, the proposed method provides a higher degree of purification of natural gas.

Thus, the use of the proposed natural gas purification method, along with an increase in the purification rate, increases the amount of fine gas by 50–100% and reduces the cost of the adsorbent when replacing a part of the more expensive synthetic adsorbent with a cheaper natural adsorbent.

For example, the replacement of 50% silica gel, which is 600 Pfj. for 1 ton, for natural bentonites, the maximum cost of which is 10 r for 1 ton, allows to obtain savings per ton of adsorbent used in the proposed method,

5 in the amount of 295 p, v Considering that for the purification of 1 million m of gas per day it is required with a three-adsorber scheme 45-50 tons of adsorbent, the economic effect from the implementation of the proposed method is 15 thousand rubles per 1 million m

0 natural gas.

In addition, the proposed method does not require special equipment for its implementation, does not require the use of a special third adsorbent, since the effect is achieved by rational placement of one medium porous adsorbent in the first and third layers and can be used in existing adsorption plants.

Claims (2)

Claim 1. A method of purifying natural gas from water vapor and gasoline hydrocarbons, comprising first passing it through a layer of finely porous natural adsorbent, then through a layer of medium-porous adsorbent, characterized in that, in order to increase the degree of purification by lowering the dew point, the gas is preliminarily passed through a medium-porous layer adsorbent, and before passing the gas, the adsorbents are subjected to thermal activation with natural gas in the presence of water vapor and gasoline hydrocarbons. 2. The method according to π. 1, with the fact that the thermal activation of the adsorbents is carried out with natural gas taken in an amount of 10-50 m ³ per 1 kg of adsorbent.