Elimination of recycle compressor in dehydration and contaminant removal systems

A process implemented using an adsorption system, the process comprising:

• cycling four or more adsorbent bed containing vessels in a system from (a) through (d), wherein:
• (a) comprises a high pressure adsorbent bed containing vessel in adsorption mode having a pressure P1;
• (b) comprises a low pressure adsorbent bed containing vessel in adsorption mode having a pressure P3;
• (c) comprises an adsorbent bed containing vessel in regeneration mode on heating having a pressure P2h;
• and
• (d) comprises an adsorbent bed containing vessel in regeneration mode on cooling having a pressure P2c,
• wherein P2h and P2c are an intermediate pressure between P1 and P3 such that P1>P2h>P3 and P1>P2c>P3.

An adsorption system comprising:

• (a) a high pressure adsorbent bed containing vessel in adsorption mode having a pressure P1;
• (b) a low pressure adsorbent bed containing vessel in adsorption mode having a pressure P3;
• and
• at least one of:
• (c) an adsorbent bed containing vessel in regeneration mode on heating having a pressure P2h;
• and
• (d) an adsorbent bed containing vessel in regeneration mode on cooling having a pressure P2c,
• wherein P2h and P2c are an intermediate pressure between P1 and P3 such that P1>P2h>P3 and P1>P2c>P3;
• wherein the system is configured to:
• introduce a gas feed stream into (a) to generate a first product stream;
• subsequently, pass a slip stream of the first product stream into at least one of (c) or (d) such that the slip stream is used as a regeneration gas for at least one of (c) or (d);
• and
• subsequently, introduce the regeneration gas from an outlet stream of at least one of (c) or (d) into (b), without the regeneration gas passing through a compressor between an outlet of (c) or (d) and an inlet of (b), to generate a second product stream.