초록 ▼

A molecular sieve adsorbent for the purification of gas streams containing water vapor and carbon dioxide and a process for its preparation. The adsorbent is a sodium form of a low-silica faujasite having a silica to alumina ratio of about 1.8:1 to about 2.2:1, a residual content of potassium ions l

A molecular sieve adsorbent for the purification of gas streams containing water vapor and carbon dioxide and a process for its preparation. The adsorbent is a sodium form of a low-silica faujasite having a silica to alumina ratio of about 1.8:1 to about 2.2:1, a residual content of potassium ions less than about 8.0 percent (equiv.), a low content of crystalline and amorphous admixtures and crystal sizes generally within the range of 1-4 .mu.m, blended with a binder.

대표청구항 ▼

[ We claim:] [1.] A molecular sieve adsorbent for gas purification which comprises a sodium form of low-silica faujasite, having a silica: alumina ratio of about 1.8-2.2 with a residual content of potassium ions less than about 8.0 percent (equiv.), and a binder, wherein at least about 80% of said l

[ We claim:] [1.] A molecular sieve adsorbent for gas purification which comprises a sodium form of low-silica faujasite, having a silica: alumina ratio of about 1.8-2.2 with a residual content of potassium ions less than about 8.0 percent (equiv.), and a binder, wherein at least about 80% of said low-silica faujasite, by weight, has a crystal size in the range of 1-4 .mu.m and wherein the adsorbent has a volume of macropores with a radius from about 1000 to 10,000 .ANG. of at least about 0.4 cm.sup.3 /g. [13.] A process for the adsorption of carbon dioxide and water from a gas stream comprisingpassing the gas stream containing carbon dioxide and water over the molecular sieve adsorbent of claim 1, whereby substantial quantities of the carbon dioxide and water are adsorbed by the molecular sieve adsorbent. A process for the production of a molecular sieve adsorbent comprisingpreparing a sodium form of a low-silica faujasite, wherein the low-silica faujasite has a silica: alumina ratio of about 1.8 to about 2.2 and a residual content of potassium ions less than about 8.0 percent (equiv.);blending the resultant product with a binder and a peptizer, where in the blended product has a volume of macropores with a radius from about 1000 to 10000 .ANG. of at least about 0.4 cm.sup.3 /g;forming the blended product into a shaped article; anddrying and calcining the article to produce the adsorbent product. The process of claim 14 wherein the low-silica faujasite is prepared by mixing sodium aluminate, sodium silicate and sodium and potassium hydroxide, wherein the ratio of the components expressed as mixtures of oxide are within the following ranges: