Enzymatic phase transfer solvent for CO2/H2S capture

A process for capturing CO2 and/or H2S from a source gas using a phase transfer solvent, the process comprising:

• preparing the phase transfer solvent;
• passing the source gas comprising CO2 and/or H2S through the phase transfer solvent;
• separating a CO2 and/or H2S rich stream and a CO2 and/or H2S lean stream;
• recycling the CO2 and/or H2S lean stream through an absorber;
• withdrawing the CO2 and/or H2S rich stream and passing into a stripper column for regeneration of the CO2 and/or H2S, wherein regeneration temperature ranges from 75° C. to 95° C.;
• and
• measuring CO2 and/or H2S loading in the phase transfer solvent by gravimetric method and pressure drop experiment to determine cyclic capacity;
• wherein preparing the phase transfer solvent comprises:
• preparing an amine solution by mixing one primary amine and one secondary amine for 1-2 hours;
• adding at least one tertiary amine with constant stirring;
• adding a phase splitting agent and mixing till formation of a homogeneous phase;
• preparing a modified hyperthermophilic enzyme;
• adding the modified hyperthermophilic enzyme to the homogeneous phase;
• adding a phase stabilizing agent and continuously stirring for 2 hours;
• and
• adding a thermo-conductive fluid to obtain the phase transfer solvent,
• wherein preparing the modified hyperthermophilic enzyme comprises:
• isolating a hyperthermophilic enzyme from a microbial strain;
• preparing a thermoregulatory enzyme stabilizer using a selective oligonucleotide metal complex, wherein the selective oligonucleotide metal complex comprises an oligonucleotide and a metal salt, wherein the oligonucleotide is a single stranded hexamer oligonucleotide with a minimum of two thiosine bases comprising TTACTA, TTAATC, TTGATA, TTGCTC or a combination thereof and the metal salt is a chloride salt of Fe, Co, Cu, Ni or a combination thereof and wherein the oligonucleotide is in a concentration of 5-10 pmol/μl, and the metal salt is in a concentration of 50-100 pmol/μl;
• and
• complexing the thermoregulatory enzyme stabilizer with the hyperthermophilic enzyme to obtain the modified hyperthermophilic enzyme, wherein complexation of the thermoregulatory enzyme stabilizer and the hyperthermophilic enzyme is due to hydrogen bonding and is carried out by mixing 2 ppm of the thermoregulatory enzyme stabilizer per 1000 U/mg of the hyperthermophilic enzyme in presence of a phosphate buffer (50 mM) of pH 6-6.5, wherein the modified hyperthermophilic enzyme is affective for a phase transformation solvent, or a homogeneous solvent used for CO2 capture.