Method for supplying reaction gases in catalytic vapor phase oxidation process

摘要

A method for supplying reaction gases in which at least a material to be oxidized and a gas containing molecular oxygen are mixed and the resultant mixture is supplied to a catalytic gas-phase oxidation reactor, characterized in that, a feed rate of the material to be oxidized and a feed rate of the gas containing molecular oxygen are adjusted so that when a composition of a gas at the inlet of the catalytic gas-phase oxidation reactor is changed from a composition A point [the concentration of the material to be oxidized: R(a), and the concentration of oxygen: O(a)] represented by plotting a concentration of the material to be oxidized and a concentration of oxygen in the gas at said inlet to a composition B point [R(b) and O(b)] [the composition A point and the composition B point are compositions outside an explosion range, and R(a)≠R(b) and O(a)≠O(b)], compositions on the way of the change from the composition A point to the composition B point fall outside the explosion range.

主权项

1. A method for supplying reaction gases in a catalytic gas-phase oxidation reaction in which at least a material to be oxidized and a gas containing molecular oxygen are mixed and the resultant mixture is supplied to a catalytic gas-phase oxidation reactor,
wherein a feed rate of the material to be oxidized and a feed rate of the gas containing molecular oxygen are adjusted, without shutting off a feed, so that when a composition of a gas at the inlet of the catalytic gas-phase oxidation reactor is changed from a reactive composition A point, which is the concentration of the material to be oxidized: R(a), and the concentration of oxygen: O(a) represented by plotting a concentration of the material to be oxidized and a concentration of oxygen in the gas at said inlet to a reactive composition B point, which is the concentration of the material to be oxidized: R(b), and the concentration of oxygen: O(b), with a proviso that the composition A point and the composition B point are compositions outside a range in which the material to be oxidized and oxygen possibly react to cause explosion, which range is an explosion range, and R(a)≠R(b) and O(a)≠O(b), compositions on the way of the change from the composition A point to the composition B point fall outside the explosion range, wherein the material to be oxidized is isobutylene, tertiary butyl alcohol or methacrolein, wherein one of the feed rates of the material to be oxidized and the gas containing molecular oxygen is adjusted in advance by increasing it or decreasing it to the direction away from the explosion range and then the other feed rate is adjusted by increasing it or decreasing it to reach to the composition B point so that the compositions on the way of the change from the composition A point to the composition B point fall outside the explosion range.