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A continuous, cyclic, vapor-phase adsorption process for the separation of normal paraffins from a hydrocarbon feed mixture, providing improved efficiency of separation and continuity of product flows. For purposes of this process, a continuous flow of the feed mixture and a continuous flow of an el

A continuous, cyclic, vapor-phase adsorption process for the separation of normal paraffins from a hydrocarbon feed mixture, providing improved efficiency of separation and continuity of product flows. For purposes of this process, a continuous flow of the feed mixture and a continuous flow of an eluent are passed in repetitions of a particular sequence of six process steps to at least four adsorbent beds.

대표청구항 ▼

An improved process for using at least four molecular sieve adsorbent beds to effect the resolution of a continuous flow of a vapor-phase hydrocarbon feed mixture containing normal paraffins and non-normal-paraffin hydrocarbons into an adsorbate product fraction comprising normal paraffins and a raf

An improved process for using at least four molecular sieve adsorbent beds to effect the resolution of a continuous flow of a vapor-phase hydrocarbon feed mixture containing normal paraffins and non-normal-paraffin hydrocarbons into an adsorbate product fraction comprising normal paraffins and a raffinate product fraction comprising non-normal-paraffin hydrocarbons, which process comprises repeated sequential performance of the following steps: step one, in which the feed mixture is passed through a first adsorbent bed, effluent is withdrawn from the first bed and passed through a second adsorbent bed a major portion of a continuous flow of an eluent is passed through a third adsorbent bed, a minor portion of the continuous flow of the eluent is passed through a fourth adsorbent bed, adsorbate product is withdrawn as effluent from the third bed and from the fourth bed, and raffinate product is withdrawn as an effluent from the second bed; step two, in which the feed mixture is passed through the second bed, a major portion of the eluent flow is passed through the third bed, a minor portion of the eluent flow is passed through the first bed, effluent is withdrawn from the first bed and is passed through the fourth bed, adsorbate product is withdrawn as effluent from the third bed, and raffinate product is withdrawn as effluent from the second bed and from the fourth bed; step three, in which the feed mixture is passed through the second bed, effluent is withdrawn from the second bed and passed through the third bed, a major portion of the eluent flow is passed through the first bed, a minor portion of the eluent flow is passed through the fourth bed, adsorbate product is withdrawn as effluent from the first bed and from the fourth bed, raffinate product is withdrawn as an effluent from the third bed; step four, in which the feed mixture is passed through the third bed, a major portion of the eluent flow is passed through the first bed, a minor portion of the eluent flow is passed through the second bed, effluent is withdrawn from the second bed and is passed through the fourth bed, adsorbate product is withdrawn as effluent from the first bed, and raffinate product is withdrawn as effluent from the third bed and from the fourth bed; step five, in which the feed mixture is passed through the third bed, effluent is withdrawn from the third bed and passed through the first bed, a major portion of the eluent flow is passed through the second bed, a minor portion of the eluent flow is passed through the fourth bed, adsorbate product is withdrawn as an effluent from the second bed and from the fourth bed, raffinate product is withdrawn as an effluent from the first bed; and step six, in which the feed mixture is passed through the first bed, a major portion of the eluent flow is passed through the second bed, a minor portion of the eluent flow is passed through the third bed, effluent is withdrawn from the third bed and is passed through the fourth bed, adsorbate product is withdrawn as effluent from the second bed, and raffinate product is withdrawn as effluent from the first bed and from the fourth bed.