Solar hydrogen production and CO recycling - Solar Energy Sciences and Engineering Applications - page 280

Table 9.3.3 Distribution of energy requirements of methanol production.

H 2 production: equivalent thermal CCS: equivalent thermal energy requirement

energy requirement for 3 moles of H 2 for 1 mole of CO 2

Method kJ method kJ

Cu-Cl cycle 1759 Na 2 CO 3 -based 353.0

1759 K 2 CO 3 -based 363.8

1759 CaO-based 440.4

1759 MEA-based 412.0

Water electrolysis 2147 Na 2 CO 3 -based 353.0

2147 K 2 CO 3 -based 363.8

2147 CaO-based 440.4

2147 MEA-based 412.0

Figure 9.3.1 Percentage of CO 2 capture energy in the synthesis of methanol production.

by hydrogen preparation accounts for the majority of energy cost in the methanol
production process.
As Reaction 9.3.4 can be self-sustained and the solar reactors for hydrogen pro-
duction have been presented in the hydrogen production section of the chapter, this
section will focus on the reactors for CO 2 capture, particularly the extraction of solid
carbonates from the aqueous solution and the release of CO 2 from the carbonates or
sorbents. As the carbonation and calcination operations are very mature in industry,