초록 ▼

The invention relates to a catalyst composition comprising a mixed oxide of vanadium, titanium, and phosphorus. The titanium component is derived from a water-soluble, redox-active organo-titanium compound. The catalyst composition is highly effective at facilitating the vapor-phase condensation of

The invention relates to a catalyst composition comprising a mixed oxide of vanadium, titanium, and phosphorus. The titanium component is derived from a water-soluble, redox-active organo-titanium compound. The catalyst composition is highly effective at facilitating the vapor-phase condensation of formaldehyde with acetic acid to generate acrylic acid, particularly using an industrially relevant aqueous liquid feed. Additionally, the catalyst composition is catalytically active towards the formation of acrylic acid from methylene diacetate and methacrylic acid from methylene dipropionate; both reactions are carried out with high space time yields.

대표청구항 ▼

1. A process for preparing acrylic acid comprising: contacting methylene diacetate and a diluent gas with a condensation catalyst under vapor-phase condensation conditions to obtain the acrylic acid;wherein the condensation catalyst comprises a mixed oxide of vanadium (V), titanium (Ti), and phospho

1. A process for preparing acrylic acid comprising: contacting methylene diacetate and a diluent gas with a condensation catalyst under vapor-phase condensation conditions to obtain the acrylic acid;wherein the condensation catalyst comprises a mixed oxide of vanadium (V), titanium (Ti), and phosphorus (P);wherein the methylene diacetate has the general formula (I): and wherein R is hydrogen. 2. The process according to claim 1, wherein the condensation catalyst has the formula VTiaPbOc, wherein a is a number from 0.3 to 6.0, b is a number from 2.0 to 13.0, and c is the number of atoms required to satisfy the valences of the components other than oxygen. 3. The process according to claim 2, wherein the titanium component is the residue of a water-soluble, redox-active organo-titanium compound. 4. The process according to claim 1, wherein the organo-titanium compound comprises titanium(IV) bis(ammonium lactate)dihydroxide. 5. The process according to claim 1, wherein the contacting occurs with 1 mol % to 90 mole % diluent gases, based on the total moles of the methylene diacetate and the diluent gas. 6. The process according to claim 1, wherein the diluent gas comprises from about 0.5 mole % to about 20 mole % oxygen, based on the total moles of diluent gas. 7. The process according to claim 1, wherein the space time yield of the 2,3 unsaturated carboxylic acid is from about 0.1 to about 200 moles of 2,3 unsaturated carboxylic acid per kg catalyst per hour. 8. A process for preparing methacrylic acid comprising: contacting methylene dipropionate and a diluent gas with a condensation catalyst under vapor-phase condensation conditions to obtain the acrylic acid;wherein the condensation catalyst comprises a mixed oxide of vanadium (V), titanium (Ti), and phosphorus (P);wherein the methylene dipropionate has the general formula (I): and wherein R is a methyl group. 9. The process according to claim 8, wherein the condensation catalyst has the formula VTiaPbOc, wherein a is a number from 0.3 to 6.0, b is a number from 2.0 to 13.0, and c is the number of atoms required to satisfy the valences of the components other than oxygen. 10. The process according to claim 9, wherein the titanium component is the residue of a water-soluble, redox-active organo-titanium compound. 11. The process according to claim 8, wherein the organo-titanium compound comprises titanium(IV) bis(ammonium lactate)dihydroxide. 12. The process according to claim 8, wherein the contacting occurs with 1 mol % to 90 mole % diluent gases, based on the total moles of the methylene diacetate and the diluent gas. 13. The process according to claim 8, wherein the diluent gas comprises from about 0.5 mole % to about 20 mole % oxygen, based on the total moles of diluent gas. 14. The process according to claim 8, wherein the space time yield of the 2,3 unsaturated carboxylic acid is from about 0.1 to about 200 moles of 2,3 unsaturated carboxylic acid per kg catalyst per hour. 15. A process for preparing a 2,3-unsaturated carboxylic acid, comprising: contacting a methylene dialkanoate and a diluent gas with a condensation catalyst under vapor-phase condensation conditions to obtain the 2,3-unsaturated carboxylic acid,wherein the condensation catalyst comprises a mixed oxide of vanadium (V), titanium (Ti), and phosphorus (P);wherein the titanium component is the residue of a water-soluble, redox-active organo-titanium compound comprising titanium(IV) bis(ammonium lactate)dihydroxide;wherein the methylene dialkanoate has the general formula (I): and wherein R is selected from the group consisting of hydrogen, methyl, ethyl, propyl, and isopropyl. 16. The process according to claim 15, wherein the condensation catalyst has the formula VTiaPbOc, wherein a is a number from 0.3 to 6.0, b is a number from 2.0 to 13.0, and c is the number of atoms required to satisfy the valences of the components other than oxygen. 17. The process according to claim 15, wherein R is methyl, wherein the methylene dialkanoate is methylene dipropionate. 18. The process according to claim 15, wherein R is hydrogen, wherein the methylene dialkanoate is methylene diacetate. 19. The process according to claim 15, wherein the diluent gas comprises from about 0.5 mole % to about 20 mole % oxygen, based on the total moles of diluent gas. 20. The process according to claim 15, wherein the space time yield of the 2,3 unsaturated carboxylic acid is from about 0.1 to about 200 moles of 2,3 unsaturated carboxylic acid per kg catalyst per hour.