Abstract
With the increasing use of fossil fuels and the increasing concentration of carbon dioxide in the world. Carbon dioxide capture and storage (CCS) has been regarded as an important way to reduce carbon emissions. Although the considerable progress has been made in capturing, storage technology has been stagnant. So how to reduce carbon emissions and how to transform carbon dioxide into chemical and energy products has become a very important issue. In this study, GH-space idealized process analysis was used to analyze several carbon dioxide reusing processes. This ideal analysis was used to calculate the least energy-consuming and to minimize the carbon dioxide emissions from the process. The research is divided into two parts. Frist part is to study the carbon reduction ability of different H2/CO ratio of syngas produced by different reforming reactions. Second part is to find the best reaction path to synthesis DMC from CO2 and methanol. For the syngas synthesis research, we found Dry/Steam process has ability to reduce CO2 if H2/CO ratio less than 1.6. Dry/Steam/Partial process can reduce CO2 when H2/CO ratio less than 2.2. Dry+H2 process can reduce CO2 in any H2/CO ratio. In raw material cost research shows, only if H2 price lower than 1000 USD/Ton, Dry/H2 process can compete with the others. For the DMC synthesis research, we found it is possible to find the best reaction path by GH-space. In terms of carbon reduction ability. Transesterification method, direct synthesis method and direct synthesis method (with BO dehydration) all have very good carbon reduction ability, and methanol oxidation carbonylation method has the worst carbon reduction ability. If consider all carbon reduction ability, reaction conversion and product profits. Urea indirect alcoholysis via PC should be the best path.