Patent GB-955724-A (GB)
Title: Improvements in the purification of reformer hydrogen
IPC: C10G61/06
Filed: 1960-11-28
Abstract: Water is removed from a reformer hydrogen stream by contact with a bed of crystalline zeolitic molecular sieve material of pore size not more than 4 <\>rA.  Suitable molecular sieves are mordenite, analcite, harmatone, phillipsite, gmelinite, chabazite and erionite, and synthetic zeolites A, D, R, S, T, F, M, J and H. When sulphur-containing compounds, e.g. H2S and mercaptans, are also present and it is desired to remove them the pore size should be 3.6-4 <\>rA, suitable sieves being chabazite, gmelinite, and mordenite and synthetic zeolites A, D, R, S and T.  The pressure during the contacting may be at least 14.5 atmosphere, and preferably 21-42 atmospheres, and the temperature may be 5-65 DEG  C., preferably 5-40 DEG  C.  The superficial linear gas velocity of the reformer hydrogen stream may be less than 46 cm. per second. Two or more beds of crystalline zeolitic molecular sieve material may be provided for alternate use in adsorption and desorption strokes.  The desorption may be effected by heating the loaded bed to 175-315 DEG C., preferably 232-288 DEG  C., passing a heated purge gas through it, and cooling by passing therethrough at least part of a moisture-depleted reformer hydrogen stream in a direction co-current to that in which the gas passed during adsorption.  The purge gas may be moisture-containing reformer hydrogen at a pressure below 5 atmospheres, and to effect desorption there may be passed at least 8 grammoles of heated, moisture-containing reformer hydrogen per 100 grams of zeolitic molecular sieve.  The purge gas may be passed in the opposite direction to that in which reformer hydrogen was passed during the adsorption stroke. Specifications 777,232, 777,233, 841,812, 847,057, 868,846, 896,783, 896,784, 908,762, 909,265 and 912,936 are referred to.ALSO:Water is removed from a reformer hydrogen stream by contact with a bed of crystalline zeolitic molecular sieve material of pore size not more than 4 .  Suitable molecular sieves are mordenite, analcite, harmatone, phillipsite, gmelinite, chabazite and erionite, and synthetic zeolites A, D, R, S, T, F, M, J and H. When sulphur-containing compounds, e.g. H2S and mercaptans, are also present and it is desired to remove them the pore size should be 3,6-4 , suitable sieves being chabazite, gmelinite, and mordenite and synthetic zeolites A, D, R, S and T. The pressure during the contacting may be at least 14,5 atmospheres, and preferably 21-42 atmospheres, and the temperature may be 5-65 DEG C., preferably 5-40  DEG C.  The superficial linear gas velocity of the reformer hydrogen stream may be less than 46 cm. per second. Two or more beds of crystalline zeolitic molecular sieve material may be provided for alternate use in adsorption and desorption strokes. The desorption may be effected by heating the loaded bed to 175-315 DEG C., preferably 232-288  DEG C., passing a heated purge gas through it, and cooling by passing therethrough at least part of a moisture-depleted reformer hydrogen stream in a direction co-current to that in which the gas passed during adsorption.  The purge gas may be moisture-containing reformer hydrogen at a pressure below 5 atmospheres, and to effect desorption there may be passed at least 8 gram-moles of heated, moisture-containing reformer hydrogen per 100 grams of zeolitic molecular sieve.  The purge gas may be passed in the opposite direction to that in which reformer hydrogen was passed during the adsorption stroke.  Specifications 777,232, 777,233, 841,212, 847,057, 868,846, 896,783, 896,784, 908,762, 908,265 and 912,936 are referred to.