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PARTIAL DRYING UPSTREAM OF A HYDROGEN PURIFICATION UNIT

IP.com Disclosure Number: IPCOM000231912D
Publication Date: 2013-Oct-15
Document File: 2 page(s) / 33K

Publishing Venue

The IP.com Prior Art Database

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PARTIAL DRYING UPSTREAM OF A HYDROGEN PURIFICATION UNIT

 

It is proposed to dry synthesis gas partially, without using an adsorption unit, upstream of a PSA. It is not necessary to achieve such low water content as is possible using adsorption but it is sufficient to reduce the dewpoint of the residual gas so that it can be compressed without reaching the dew point of the residual gas, at least as far as a traditional drying step upstream of at least one of the compression stages.

One requirement is to keep the PSA entry temperature between 30 and 40°C so as to allow optimal H2 recovery.

Figure 1 : Partial drying upstream of  PSA

The partial drying upstream of the hydrogen PSA includes the following steps :

a) cooling of the syngas with partial condensation

b) separation off of the condensates produced giving a dry syngas and a condensate stream ; the drier can be integrated with the cooling exchanger

c) warming of the synga so that the gas enters the H2 PSA above the dew point and at a temperature chosen to optimise the hydrogen yield

d) separation of hydrogen by PSA

e) compression of PSA waste stream

f) drying of the PSA compressed waste stream

g) optional additional compression

h) CO2 separation or purification by partial condensation and/or distillation

The cooling of step a) and the warming of step c) can be carried out using the same water stream as shown in the figure.

The cooling of step a) produces gas in step d) at  a temperature of at least 2°C, preferably mo...