US 11,745,157 B2
Off-gas incinerator control
Manoj Shrikant Shouche, Pearland, TX (US); Timothy Robert McDonel, Elburn, IL (US); and Jay Robert Couch, Naperville, IL (US)
Assigned to INEOS EUROPE AG, Rolle (CH)
Appl. No. 16/301,884
Filed by INEOS EUROPE AG, Rolle (CH)
PCT Filed May 4, 2017, PCT No. PCT/US2017/030954
§ 371(c)(1), (2) Date Nov. 15, 2018,
PCT Pub. No. WO2017/205019, PCT Pub. Date Nov. 30, 2017.
Claims priority of application No. 201610346931.6 (CN), filed on May 24, 2016.
Prior Publication US 2019/0282991 A1, Sep. 19, 2019
This patent is subject to a terminal disclaimer.
Int. Cl. C07C 253/26 (2006.01); C07C 255/08 (2006.01); B01J 19/00 (2006.01); C07C 253/28 (2006.01); C07C 253/24 (2006.01)
CPC B01J 19/002 (2013.01) [B01J 19/0006 (2013.01); B01J 19/0013 (2013.01); C07C 253/24 (2013.01); C07C 253/26 (2013.01); C07C 253/28 (2013.01); C07C 255/08 (2013.01); B01J 2219/00051 (2013.01); B01J 2219/00164 (2013.01); B01J 2219/00216 (2013.01); B01J 2219/00218 (2013.01); B01J 2219/00243 (2013.01)] 6 Claims
 
1. A process for operating an off-gas incinerator, the process comprising:
introducing a flow of reactant stream into an ammoxidation reactor, wherein the reactant stream includes ammonia, an oxygen containing gas, and a hydrocarbon selected from the group consisting of propane, propylene, or mixtures thereof;
determining amount of hydrocarbon in the reactant stream being introduced into the ammoxidation reactor and determining a feed rate of the reactant stream to the ammoxidation reactor, wherein a hydrocarbon conversion rate is about 95% to less than 100%;
conveying a gaseous reactor effluent from the ammoxidation to a quench vessel to provide a quenched stream;
conveying the quenched stream to an absorber wherein acrylonitrile is absorbed from the quenched stream with an aqueous solution;
supplying an absorber off-gas from the absorber to an absorber off-gas incinerator, wherein the absorber off-gas has about 5 weight % or less water;
supplying fuel gas and air to the absorber off-gas incinerator; and
using the amount of hydrocarbon in the reactant stream being introduced into the ammoxidation reactor and the feed rate of the reactant stream to the ammoxidation reactor in a model predictive control system to adjust the fuel gas flow to the absorber off-gas incinerator and the air flow to the absorber off-gas incinerator in an amount effective for maintaining a temperature in the absorber off-gas incinerator within about 10° F. of a temperature set point of the off-gas incinerator and for providing about 5 volume % or less oxygen in the absorber off-gas incinerator,
wherein the process maintains about 6 kg or less NOx in the absorber incinerator off-gas per ton of acrylonitrile produced.