	US 11,806,702 B2
	Method for producing oxide catalyst and method for producing unsaturated nitrile
Eri Tateno, Tokyo (JP); and Minoru Kadowaki, Tokyo (JP)
Assigned to ASAHI KASEI KABUSHIKI KAISHA, Tokyo (JP)
Filed by ASAHI KASEI KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jul. 12, 2021, as Appl. No. 17/373,342.
Application 17/373,342 is a continuation of application No. 16/332,732, granted, now 11,141,722, previously published as PCT/JP2017/032564, filed on Sep. 8, 2017.
Claims priority of application No. 2016-178885 (JP), filed on Sep. 13, 2016.
Prior Publication US 2021/0339239 A1, Nov. 4, 2021
Int. Cl. B01J 37/08 (2006.01); B01J 23/30 (2006.01); B01J 37/04 (2006.01); C07C 253/24 (2006.01); C07C 255/08 (2006.01); B01J 23/00 (2006.01); C07C 51/215 (2006.01); B01J 37/00 (2006.01); B01J 37/03 (2006.01); C07B 61/00 (2006.01)

CPC B01J 37/08 (2013.01) [B01J 23/002 (2013.01); B01J 23/30 (2013.01); B01J 37/0027 (2013.01); B01J 37/031 (2013.01); B01J 37/04 (2013.01); C07C 51/215 (2013.01); C07C 253/24 (2013.01); C07C 255/08 (2013.01); B01J 2523/00 (2013.01); B01J 2523/3706 (2013.01); B01J 2523/3712 (2013.01); B01J 2523/3787 (2013.01); B01J 2523/44 (2013.01); B01J 2523/55 (2013.01); B01J 2523/56 (2013.01); B01J 2523/68 (2013.01); B01J 2523/69 (2013.01); C07B 61/00 (2013.01); Y02P 20/52 (2015.11)]

3 Claims

1. A method for producing an unsaturated nitrile, the method comprising the steps of:

producing an oxide catalyst by following steps of:

a raw material preparation step of obtaining an aqueous mixed liquid comprising Mo, V, Sb, and Nb;

an aging step of subjecting the aqueous mixed liquid to aging at more than 30° C.;

a drying step of drying the aqueous mixed liquid, thereby obtaining a dried powder; and

a calcination step of calcining the dried powder, thereby obtaining the oxide catalyst,

wherein, in the raw material preparation step and/or the aging step, precipitation of Nb is facilitated by performing at least one operation selected from the group consisting of the following (I) to (III):

(I) in the raw material preparation step, the aqueous mixed liquid is prepared by mixing a Nb raw material liquid comprising Nb with a MoVSb raw material liquid comprising Mo, V, and Sb, wherein ammonia is added to at least one of the MoVSb raw material liquid, the Nb raw material liquid, and the aqueous mixed liquid such that a molar ratio in terms of NH₃/Nb in the aqueous mixed liquid is adjusted to be 0.7 or more, and in the aging step, a temperature of the aqueous mixed liquid is adjusted to more than 60° C.;

(II) in the aging step, a temperature of the aqueous mixed liquid is adjusted to more than 65° C.; and

(III) in the raw material preparation step, the aqueous mixed liquid is prepared by mixing a Nb raw material liquid comprising Nb with a MoVSb raw material liquid comprising Mo, V, and Sb, wherein a molar ratio in terms of H₂O₂/Nb in the Nb raw material liquid is adjusted to less than 0.2, and in the aging step, a temperature of the aqueous mixed liquid is adjusted to more than 60° C.; and

further comprising a step of producing an unsaturated nitrile through a gas-phase catalytic ammoxidation reaction of propane or isobutane in a presence of the produced oxide catalyst.