Abstract: A method for producing a molded product consisting of a resin polymerized by a melt polycondensation reaction, comprising continuous feeding of a prepolymer in molten state from a prepolymer feeding port to a polymerization reactor, discharging from holes of a porous plate, followed by polymerization while dropping along a supporting substrate under reduced pressure, and molding by transferring to at least one molding machine in molten state without solidification, wherein transfer pressure to said molding machine is controlled so as to maintain at an arbitrary pressure from 0.1 to 100 MPa (absolute pressure).

Abstract: Disclosed is a method for recycling a recovered polycondensation polymer which comprises a process wherein a recovered polycondensation polymer is supplied in a molten state to a polymerizer having a porous plate, and then after ejecting the polycondensation polymer through pores of the porous plate, the polymerization degree of the polycondensation polymer is increased under a reduced pressure or in a reduced inert gas atmosphere while dropping the polycondensation polymer along a supporting body.

Abstract: Disclosed is a method for recycling a recovered polycondensation polymer which comprises a process wherein a recovered polycondensation polymer is supplied in a molten state to a polymerizer having a porous plate, and then after ejecting the polycondensation polymer through pores of the porous plate, the polymerization degree of the polycondensation polymer is increased under a reduced pressure or in a reduced inert gas atmosphere while dropping the polycondensation polymer along a supporting body.

Abstract: A method for producing a molded product consisting of a resin polymerized by a melt polycondensation reaction, comprising continuous feeding of a prepolymer in molten state from a prepolymer feeding port to a polymerization reactor, discharging from holes of a porous plate, followed by polymerization while dropping along a supporting substrate under reduced pressure, and molding by transferring to at least one molding machine in molten state without solidification, wherein transfer pressure to said molding machine is controlled so as to maintain at an arbitrary pressure from 0.1 to 100 MPa (absolute pressure).

Abstract: A process for producing an alkylene carbonate, which comprises reacting an alkylene oxide with carbon dioxide in the presence of a catalyst in a reactor to obtain a reaction mixture containing an alkylene carbonate, the reactor communicating with a process-side channel of a heat exchanger through a piping to form a circulation circuit, wherein the process is characterized in that it further comprises, during or after the reaction, flowing a process liquid through the circulation circuit including the reactor and the process-side channel of the heat exchanger while flowing a heat exchange medium having a temperature of from 140° C. to 200° C. through the heat exchange-side channel of the heat exchanger, thereby maintaining the inner temperature of the process-side channel at 135° C. to 200° C.

Abstract: A process for producing an alkylene carbonate, which comprises reacting an alkylene oxide with carbon dioxide in the presence of a catalyst in a reactor to obtain a reaction mixture containing an alkylene carbonate, the reactor communicating with a process-side channel of a heat exchanger through a piping to form a circulation circuit, wherein the process is characterized in that it further comprises, during or after the reaction, flowing a process liquid through the circulation circuit including the reactor and the process-side channel of the heat exchanger while flowing a heat exchange medium having a temperature of from 140° C. to 200° C. through the heat exchange-side channel of the heat exchanger, thereby maintaining the inner temperature of the process-side channel at 135° C. to 200 ° C.

Abstract: A process for producing acrylonitrile or methacrylonitrile, wherein a molybdenum compound, which is convertible to molybdenum oxide and not supported on a carrier is added to a fluidized bed reactor as an activator, in such a way that the ratio y of molybdenum atoms in the oxide catalyst represented by the formula:Mo.sub.y Bi.sub.p Fe.sub.q A.sub.a B.sub.b C.sub.c D.sub.d E.sub.e O.sub.fwill be maintained in the range of 1.02x to 1.12x (x=1.5p+q+a+c+1.5d+1.5e) during an ammoxydation reaction.

Abstract: The present invention is a process for producing an unsaturated nitrile such as acrylonitrile or methacrylonitrile by ammoxidation of an organic compound such as propylene, isobutene or tertiary butanol. The process comprises carrying out the ammoxidation such that the organic acid/unreacted ammonia ratio in an ammoxidation product gas is controlled to remain within the range from 0.8 to 3.0 inclusive in a reactor, introducing the ammoxidation product gas into a quench tower, and reacting in the tower the unreacted ammonia with the organic acid produced in a reactor, to fix the unreacted ammonia as an ammonium salt of the organic acid.

Abstract: Disclosed is an ammoxidation catalyst composition for use in producing acrylonitrile from propylene, or methacrylonitrile from isobutene or tert-butanol, by ammoxidation of the propylene or of the isobutene or tert-butanol, comprising an oxide catalyst composition represented by the formula:Mo.sub.12 (Bi.sub.1-a A.sub.a).sub.b Fe.sub.c Co.sub.d X.sub.e Y.sub.f O.sub.g,wherein A is at least one rare earth element, X is at least one element selected from the group consisting of nickel, magnesium, zinc and manganese, Y is at least one element selected from the group consisting of potassium, rubidium and cesium, a is a number of from 0.6 to 0.8, b is a number of from 0.5 to 2, c is a number of from 0.1 to 3, d is a number of from more than 0 to 10, e is a number of from 0 to 8, f is a number of from 0.01 to 2, and g is a number determined by the valence requirements of the other elements present.

Abstract: Disclosed is an ammoxidation catalyst composition for use in producing acrylonitrile from propylene, or methacrylonitrile from isobutene or tert-butanol, by ammoxidation of the propylene or of the isobutene or tert-butanol, comprising an oxide catalyst composition represented by the formula:Mo.sub.12 (Bi.sub.1-a A.sub.a).sub.b Fe.sub.c Ni.sub.d X.sub.e Y.sub.f O.sub.g,whereinA is at least one rare earth element,X is at least one element selected from magnesium and zinc,Y is at least one element selected from potassium, rubidium and cesium,a is a number of from 0.6 to 0.8,b is a number of from 0.5 to 2,c is a number of from 0.1 to 3,d is a number of from 4 to 10,e is a number of from 0 to 3,f is a number of from 0.01 to 2, andg is a number determined by the valence requirements of the other elements present.