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The present invention is a microchannel mass exchanger having a first plurality of inner thin sheets and a second plurality of outer thin sheets. The inner thin sheets each have a solid margin around a circumference, the solid margin defining a slot through the inner thin sheet thickness. The outer

The present invention is a microchannel mass exchanger having a first plurality of inner thin sheets and a second plurality of outer thin sheets. The inner thin sheets each have a solid margin around a circumference, the solid margin defining a slot through the inner thin sheet thickness. The outer thin sheets each have at least two header holes on opposite ends and when sandwiching an inner thin sheet. The outer thin sheets further have a mass exchange medium. The assembly forms a closed flow channel assembly wherein fluid enters through one of the header holes into the slot and exits through another of the header holes after contacting the mass exchange medium.

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The present invention is a microchannel mass exchanger having a first plurality of inner thin sheets and a second plurality of outer thin sheets. The inner thin sheets each have a solid margin around a circumference, the solid margin defining a slot through the inner thin sheet thickness. The outer

The present invention is a microchannel mass exchanger having a first plurality of inner thin sheets and a second plurality of outer thin sheets. The inner thin sheets each have a solid margin around a circumference, the solid margin defining a slot through the inner thin sheet thickness. The outer thin sheets each have at least two header holes on opposite ends and when sandwiching an inner thin sheet. The outer thin sheets further have a mass exchange medium. The assembly forms a closed flow channel assembly wherein fluid enters through one of the header holes into the slot and exits through another of the header holes after contacting the mass exchange medium. radical chosen from: where Rband p are defined as above and Rcrepresents H or a C1-C3alkyl group; and (III) when na=4, Z represents a tetravalent radical of formula: where R3is a C1-C5alkylene radical or a divalent radical of formula: where Rband p are defined above. 2. Ophthalmic lens according to claim 1, characterized in that the bridged cyclic end groups are chosen from groups of formulae: in which Q represents a divalent radical chosen from --C(R')2-, --O--, --S--, --SO2-- and --NR'--, R' being a hydrogen atom or a C1-C3alkyl radical, and R represents a hydrogen atom or a C1-C3alkyl radical, n=0 to 5 and m=0 to 8. 3. Ophthalmic lens according to claim 1, wherein the monomer with a high Abbe number corresponds to the formula: where X is --O-- or --S--, B is --S-- or --C(CH3)2--, R is H or CH3,n' and n"=1 to 5 and m' and m" vary from 0 to 10. 4. An ophthalmic lens composed of a transparent organic polymer material with a high refractive index and a high Abbe number, resulting from the polymerization of a mixture of monomers comprising: at least one polythiol monomer; and at least one monomer with a high Abbe number, wherein the monomer with a high Abbe number is of formula: Z.paren open-st.A)na where A is a bridged cyclic group comprising an intracyclic ethylenic double bond or a linear or branched aliphatic residue comprising an ethylenic unsaturation and nais an integer from 2 to 4, and (I) when na=2, Z is a divalent radical of formulae: in which formulae X represents --O-- or --S--, G and G' are --(Cn'H2n'O)--m'groups, with n'=1 to 5, preferably n'=2, and m' varies from 0 to 10, or a C1-C5alkylene group, Z1is chosen from divalent radicals of formulae: in which formulae Q represents a divalent radical chosen from --C(R')2-, --O--, --S--, --SO2-- and --NR'--, R' being a hydrogen atom or a C1-C3alkyl radical, B1is a divalent radical chosen from --C(R2)2-, --S-- and --SO--2--, where R2is a C1-C3alkyl radical, x1=0 or 1, Y1independently represents Br, Cl or H, y1is an integer from 0 to 4, Rbis a --(CH2)--qgroup, q being an integer from 1 to 4, and p is an integer from 0 to 4, and Z2is a divalent radical chosen from radicals of formulae: where Q, Rband p are defined as above and Z3is a divalent radical chosen from: where Q and X1are defined as above; (II) when na=3, Z represents a trivalent radical chosen from: where Rband p are defined as above and Rcrepresents H or a C1-C3alkyl group; and (III) when na=4, Z represents a tetravalent radical of formula: where R3is a C1-C5alkylene radical or a divalent radical of formula: where Rband p are defined above. 5. Ophthalmic lens according to claim 1, wherein the monomer with a high Abbe number corresponds to the formula: where R and Rbare defined as above, p' is an integer from 1 to 3 and p" is an integer equal to 0 or 1. 6. Ophthalmic lens according to claim 5, wherein the monomer with a high Abbe number corresponds to the formula: 7. Ophthalmic lens according to claim 1, wherein the polythiol monomer has the formula R1(SH)n1,where n1is an integer at least equal to 2 and R1is an aliphatic, aromatic or heterocyclic radical. 8. Ophthalmic lens according to claim 7, wherein the polythiol monomer is a dithiol, a trithiol or