SU662114A1 - Method of regenerating ceolites in gas deep-drying process - Google Patents

Description

  ; ... ".; : i The invention relates to the field of chemical and petrochemical industry and can be used in the regeneration of zeolites, used as desiccants in the process of deep obuzi gases. In modern installations. The gaseous media used in the drying process will use various methods for the regeneration of adsorbents: increasing temperature and reducing pressure at the regeneration stage. The disadvantages of the known methods are the complexity of the design of heat generation: high energy costs and the need for an inert environment. The closest to the technical essence and the achieved result is the method of zeolite regeneration in the deep drying of gases, which consists in preheating the zeolite to 80-150 ° C and further regeneration in a current of an overheated mixture of inert gas with vapor, water at a pressure of 1-5 at temperature: 330-380 ° С 2. OD (however, the existing method does not allow to obtain a deep (dew point below) drying of gas flows during the sorbent cycle operation. This is due to insufficiently developed temperature conditions for the regeneration and the possibility of reducing the durability of zeolites during cycling. The aim of the invention is to develop a method for zeolite regeneration in the gRoCesso of the deep drying of gases, which allows to ensure the stability of zeolites without reducing their sorption capacity. -80 to-82 ° C, as well as to simplify the regeneration process. The goal is achieved by the described method of rbgenerination of zeolites in the processes of deep drying, including heating olites up to 380-400 ° C at a temperature rise rate of 1 ° C - / min, and purge air is carried out with atmospheric air with a concentration of water vapor from 2, B-10 to 50 g / m for 2-3 hours. According to the proposed method, the ascent rate temperature of 1-4 ° C / min allows you to create such a mode of regeneration of the adsorbent, which maintains the stability of the adsorption properties of zeolites in the processes of cycle work

zeolite (up to 10 cycles). Use as a heat carrier gas of atmospheric air / containing

s

water vapor 2.8-10 - 50 g / them significantly reduces energy consumption and simplifies the process of regeneration. Heating up to 380-400С and holding for 2-3 hours allows full-time restoration of the adsorption properties of zeolites during the cycle work. Example 1. Zeolites NaA, worked through in the process of deep drying of argon,: CaA, NaX and CaX, with a volume of 400 cm with a layer height of 26 cm, are heated to a lifting rate / min. Next, the zeolite layer is purged with atmospheric air with a water vapor concentration of 2.8-10 -50 g / nm for 2 hours; The effect of the psd effect of the concentration of water vapor in atmospheric air (C, g / nm on the stability of adsorption sabotage of zeolites (eg,%) is given in Table 1.

Table

3 hours. After 50 adsorption-desorption cycles, with an argon flow rate during the drying process of 2900 hours, the depth of drying corresponds to a dew point of -81 to -82 ° C.

Data on the study of the influence of the carrier gas humidity and the number of cycles on the dynamic adsorption capacity of zeolites are presented

in tab. 2.,. .-:. :; . , .

Table