METHOD FOR VARYING METHANOL CONTENT DURING REGENERATION OF ADSORBENT OF NATURAL GAS DRYING Russian patent published in 2022 - IPC B01D53/26 B01J20/34 B01J20/10 

FIELD: gas industry.

SUBSTANCE: invention relates to the field of gas purification by adsorbents, the regeneration of which is carried out by hot gas passing through the adsorbent; it can be used, for example, in the gas, oil, oil processing and petrochemical industries; it namely relates to a method for varying the methanol content during the regeneration of the adsorbent of natural gas drying. The proposed method includes primary regeneration of the adsorbent in units of complex gas purification, desorption and subsequent cooling with throttled regeneration gas, wherein cooling is carried out in a closed circuit. In the proposed method, silica gel is used as an adsorbent. To reduce the amount of methanol in a product mixture, the desorption of the used adsorbent is carried out by two-stage contact with regeneration gas supplied by direct flow with gas being purified. The primary regeneration temperature is 100-150°C, the volume of regeneration gas is 40-60% of the volume of gas of the main regeneration stage, the temperature of the main regeneration stage is 270-290°C. To increase the amount of methanol in the composition of the product mixture, the desorption of the used adsorbent is carried out by a counterflow with gas being purified, in one stage, at a temperature of 270-290°C. At the same time, in each of regeneration options, indicated technological parameters are changed within permissible and safe limits of equipment operation, during the process, based on chromatographic analysis of the composition of the water-methanol mixture at the outlet of the regenerator. For better separation of the aqueous and hydrocarbon phases, flows are switched between corresponding separators.

EFFECT: possibility of changing the methanol content in the composition of liquid products of adsorbent regeneration, within permissible operating modes of equipment, as well as reduction in specific energy costs for carrying out the process of regeneration of the adsorbent of drying and purification of natural gas during the implementation of the method.

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