RU94018874A - Cryogen cleaning process - Google Patents

Abstract

FIELD: cryogenic engineering, helium and air-separating cryogenic plants; natural gas refining plants. SUBSTANCE: process involves sequential cooling of cryogen, condensation of admixture, and separation of liquid fraction of admixture, heating of cryogen followed by adsorption of remaining admixture; cryostatic control of adsorption process is conducted by cooling down adsorbent of separated liquid fraction of admixture. For reducing admixture concentration in gas fracture, cryogen is cooled down prior to adsorbing to 1.02- 1.5 of admixture melting point and liquid fraction of admixture is separated once more or cooled down to temperature of 0.98 of admixture melting point; solid fraction of admixture is separated. To facilitate separation of liquid fracture of admixture, method using double separation of liquid fraction of admixture involves cryogen cooling down upon first separation of liquid fraction while reducing pressure by throttling, for example. EFFECT: stabilized operation of adsorber, extended time of its continuous operation, reduced size, provision for cryogen cleaning with separation of admixtures contained in it for their further use as output product. 4 cl, 4 dwg

Claims (1)

The invention relates to cryogenic technology, in particular to methods for cleaning cryoagents from impurities, and can be used in cryogenic helium and air separation plants, as well as in natural gas processing plants. The main objective of the invention is the stabilization of the adsorber, increasing the time of its continuous operation and reducing the size, as well as cleaning the cryoagent with the possibility of separating the impurities contained in it for their further use as an output product. To this end, in a method for purifying a cryoagent, which includes sequential cooling of the cryoagent, condensation of the impurity and separation of the liquid fraction of the impurity, heating of the cryoagent and subsequent adsorption of the remaining impurity in it, cryostatting of the adsorption process, is carried out by cooling the adsorbent with the separated liquid fraction of the impurity. In order to reduce the concentration of the impurity in the gas fraction, the cryoagent is cooled to 1.02-1.5 Tm (the melting point of the impurity) before the adsorber and the liquid fraction of the impurity is again separated or cooled to a temperature of 0.98 Tp of the impurity, while the solid fraction of the impurity is separated . To facilitate the separation of the liquid fraction of the impurity in the method with double separation of the liquid fraction of the impurity, the cooling of the cryoagent after the first separation of the liquid fraction is carried out with a decrease in pressure, for example, by throttling. 3 C.p. fs, 4 ill.