- Refining - Technical Questions and Answers - Technical Q & A Database

· Unlock · Lock 16 May
Chris Haslego
Ankur just published one of those blog entries that will be referenced around the internet for years to come. This is really great stuff! Perforated Pipe Distributor Sizing Calculations (otherwise know as "How to Size a Sparger") at http://www.cheresources.com/invision/blog/4/entry-353-perforated-pipe-distributor-sizing-calculations/
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· Unlock · Lock 15 May
PKS
"Its not the END, Its the end of beginning!!" Where one can get this quote? any answers?
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Submitted Chris Haslego, Nov 21 2011 11:21 AM | Last updated Nov 21 2011 01:29 PM

Category:	Refining
Question:	What is a feasible replacement for the CATACARB process for purifying hydrogen from a reforming plant?
Keywords:	catacarb,carbon,dioxide,removal,hydrogen,reformer
Answer:	BACKGROUNDThe purification process of the H₂ stream entails CO₂ removal, which is mainly produced in the CO shift step. The carbon dioxide separation has been carried out by chemical absorption using a CATACARB solution (18-20 %W). There is one packed absorption column, which works at 200-240 ⁰F and 250-280 psig. There is also one packed regenerator column where the carbon dioxide is stripped from the solvent by countercurrent flow with steam at 220-250 ⁰F and 5-10 psig.RESPONSEMany existing hydrogen and ammonia plants world-wide use MEA (monoethanolamine) or MDEA (methyl diethanolamine) solutions in their CO₂ removal porcesses. Others processes that have been used are Benfield and Seloxol. However, it seems that many, if not most, of the newer plants use the Polybed Pressure Swing Adsorption process (PSA). The PSA process does not use any solution or solvent. It uses multiple beds of a proprietary solid adsorbent.