초록 ▼

Disclosed is a process for producing an oxide catalyst comprising, as component elements, molybdenum (Mo), vanadium (V), at least one element selected from the group consisting of the two elements of antimony (Sb) and tellurium (Te), and niobium (Nb), wherein the process comprises providing an aqueo

Disclosed is a process for producing an oxide catalyst comprising, as component elements, molybdenum (Mo), vanadium (V), at least one element selected from the group consisting of the two elements of antimony (Sb) and tellurium (Te), and niobium (Nb), wherein the process comprises providing an aqueous raw material mixture containing compounds of the component elements of the oxide catalyst, and drying the aqueous raw material mixture, followed by calcination, and wherein, in the aqueous raw material mixture, at least a part of the niobium compound as one of the compounds of the component elements is present in the form of a complex thereof with a complexing agent comprising a compound having a hydroxyl group bonded to an oxygen atom or a carbon atom. Also disclosed is a process for producing (meth)acrylonitrile or (meth)acrylic acid, which comprises performing the ammoxidation or oxidation of propane or isobutane in the gaseous phase in the presence of the oxide catalyst.

대표청구항 ▼

Disclosed is a process for producing an oxide catalyst comprising, as component elements, molybdenum (Mo), vanadium (V), at least one element selected from the group consisting of the two elements of antimony (Sb) and tellurium (Te), and niobium (Nb), wherein the process comprises providing an aqueo

Disclosed is a process for producing an oxide catalyst comprising, as component elements, molybdenum (Mo), vanadium (V), at least one element selected from the group consisting of the two elements of antimony (Sb) and tellurium (Te), and niobium (Nb), wherein the process comprises providing an aqueous raw material mixture containing compounds of the component elements of the oxide catalyst, and drying the aqueous raw material mixture, followed by calcination, and wherein, in the aqueous raw material mixture, at least a part of the niobium compound as one of the compounds of the component elements is present in the form of a complex thereof with a complexing agent comprising a compound having a hydroxyl group bonded to an oxygen atom or a carbon atom. Also disclosed is a process for producing (meth)acrylonitrile or (meth)acrylic acid, which comprises performing the ammoxidation or oxidation of propane or isobutane in the gaseous phase in the presence of the oxide catalyst. f ink from said ink cartridge to said sub-tank when driven and interrupting the flow of ink when stopped, wherein said first ink channel supplies the ink of said sub-tank to said head unit, and said second ink channel feeds back the ink stored in said head unit to said sub-tank. 7. The ink jet printer according to claim 4, wherein said first pump is not driven during wiping operation of said wiper member. 8. The ink jet printer according to claim 4, further comprising a suction cap movable toward said head unit to hermetically seal said plurality of nozzles, wherein said pump unit further comprises a third pump fluidly connected to said suction cap, said third pump sucking ink in said plurality of ink chambers through said suction cap. 9. The ink jet printer according to claim 8, wherein said first pump is stopped when said third pump sucks ink in said plurality of ink chambers through said suction cap. 10. The ink jet printer according to claim 4, wherein any one of said first pump, said second pump and said third pump comprises a tube pump. 11. An ink jet printer, comprising: a printer body; a head unit detachably mounted on said printer body and having an ink head formed with a plurality of ink chambers, said ink head having a nozzle surface formed with a plurality of nozzles fluidly connected to respective ones of said plurality of ink chambers individually; a pump unit for adjusting an ink condition in said ink head, said pump unit including at least one pump; a wiper member for wiping said nozzle surface of said ink head; a motor; and a drive mechanism operatively connecting said motor to said wiper member and at least one pump included in said pump unit, said wiper member and the at least one pump connected to said motor being driven in phase-dependent on rotations of said motor, wherein said drive mechanism moves said wiper member relative to said nozzle surface, and said wiper member comprises: a blade made from a flexible material and having a tip portion in contact with said nozzle surface, said blade wiping the nozzle surface when said wiper member is moved; a blade holder for supporting said blade; and a storage mechanism