Method of regenerating an enzymatic catalyst
A method of regenerating an enzymatic catalyst arranged in a reactor includes a mineral support based on metal oxide and at least one enzyme, wherein it contains at least one step of detachment of the spent enzymes by solvation by scavenging of the catalyst using at least one ionic surfactant, and at least one step of re-attachment of active enzymes by scavenging of the purified support with at least one solution of active enzymes, the two steps being performed in situ within the reactor.
1. A method of regenerating a catalyst arranged in a reactor having a mineral support based on silica and hemoglobin, wherein saturation of the mineral support with hemoglobin is at least 100 mg of hemoglobin per gram of silica, said method comprising at least one step of detachment of the hemoglobin by solvation by scavenging of the catalyst using at least one ionic surfactant, and at least one step of re-attachment of active hemoglobin by scavenging of the purified support with at least one solution of active hemoglobin, these two steps being performed in situ within the reactor.
2. The method according to claim 1 , wherein the step of detachment of the hemoglobin comprises scavenging of the catalyst with an aqueous solution of so-called amphiphilic ionic surfactant selected from the group including salts of alkyl sulphonates, salts of alkyl sulphates, salts of alkyl sulphosuccinates, salts of alkyl phosphate esters, salts of alkylbenzene sulphonates, and quaternary ammonium salts.
3. The method according to claim 1 , wherein the concentration of spent hemoglobin measured by absorbance at a wavelength characteristic of the hemoglobin in UV spectrometry decreases in the outgoing effluent over the entire duration of the scavenging.
4. The method according to claim 1 , wherein the end of the detachment step is reached when the differential measurement of the concentration of hemoglobin expressed by its absorbance between the outgoing effluent and the stream entering the reactor becomes zero.
5. The method according to claim 1 , wherein among the ionic surfactants, the alkali metal salts of alkyl sulphates are selected from salts of alkyl sulphates, each alkyl group comprising from 6 to 20 carbon atoms in a linear or branched paraffinic chain.
6. The method according to claim 5 , wherein the alkyl sulphate salt is a sodium salt of lauryl sulphate.
7. The method according to claim 1 , wherein the steps of detachment and attachment of the hemoglobin are carried out on amorphous or crystalline silica with specific surface area in the range from 200 to 1000 m 2 /g.
8. The method according to claim 1 , wherein the step of re-attachment of the hemoglobin is obtained by scavenging the purified support with a solution of hemoglobin until the concentration of hemoglobin, i.e. its absorbance at the characteristic wavelength, increases in the outgoing effluent.
9. The method according to claim 8 , wherein the step of re-attachment of the hemoglobin is stopped when the differential measurement of the concentration of hemoglobin, measured in the ingoing stream and in the effluent leaving the reactor, becomes zero.
10. The method according to claim 1 , further comprising, between the step of detachment of the spent hemoglobin and the step of attachment of the active hemoglobin, a step of washing the support in the reactor with water to remove the spent hemoglobin and especially the residual surfactant.
11. The method according to claim 10 , wherein the end of washing is obtained when the absorbance at the characteristic wavelength of the hemoglobin in the outgoing effluent of the reactor becomes zero.
12. The method according to claim 1 , further comprising regenerating all catalysts in which the hemoglobin is attached to the support by low-energy bonds.
13. The method according to claim 12 , wherein the low-energy bonds are at least one of: van der Waals bonds, electrostatic bonds, or hydrogen bonds.
14. A method of regenerating and using a catalyst arranged in a reactor having a mineral support based on silica and hemoglobin, wherein saturation of the mineral support with hemoglobin is at least 100 mg of hemoglobin per gram of silica, said method comprising at least one step of detachment of the hemoglobin by solvation by scavenging of the catalyst using at least one ionic surfactant, and at least one step of re-attachment of active hemoglobin by scavenging of the purified support, these two steps being performed in in situ within the reactor, and using the catalysts in catalysis.