CN-121988129-A - Safe and efficient treatment method and system for hydrogen peroxide oxidized tail gas

CN121988129ACN 121988129 ACN121988129 ACN 121988129ACN-121988129-A

Abstract

The invention relates to a hydrogen peroxide oxidation tail gas treatment method and system, which comprises the following steps of carrying out effective gas-liquid separation on ① hydrogen peroxide oxidation tail gas through a pretreatment system, then entering a primary adsorption concentration system, introducing partial air quantity from the front end of an inlet pipeline of an adsorption area of the adsorption concentration system as cooling and desorption gas ②, carrying out thermal desorption on cooling and desorption air subjected to deoxidation operation in a desorption area of the adsorption concentration system ③ to obtain concentrated gas of heavy aromatics, carrying out deep adsorption on non-condensed gas which is not condensed ④ through a secondary desorption system, carrying out effective adsorption and purification treatment on clean gas which is treated through an adsorption material of the secondary adsorption and desorption system as cooling/desorption air of the primary rotary zeolite adsorption concentration system, and carrying out steam desorption-condensation recovery of aromatic hydrocarbon solvent after adsorption and saturation of the secondary adsorption and desorption system ⑥. The invention has the advantages of outstanding safety and economy, maximum improvement of concentration ratio, protection of a concentration device, simplification of a secondary recovery system and the like.

Inventors

YANG XUDONG
JIANG YAN
YU XIAOLIANG
ZHOU FAN
YANG XIN
TU ZHIXIANG
WANG XIAOHUI
CAI WENJUAN
WANG DASHAN

Assignees

武汉旭日华环保科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20251128

Claims (8)

1. The hydrogen peroxide oxidizing tail gas treating process includes the following steps: ① The hydrogen peroxide oxidized tail gas is subjected to effective gas-liquid separation through a pretreatment system, then enters a primary adsorption concentration system, and effective adsorption is carried out on aromatic hydrocarbon in the hydrogen peroxide oxidized tail gas, and clean gas is discharged to a chimney through a fan; ② Introducing partial air quantity from the front end of an inlet pipeline of an adsorption area of an adsorption concentration system as cooling and desorption gas, and carrying out deoxidation operation on the gas through a deoxidation system to control the oxygen content in the cooling and desorption gas to be less than 3%; ③ The temperature reduction and desorption wind subjected to deoxidation operation passes through a fan and a heater, thermal desorption is carried out in a desorption area of an adsorption concentration system, so that concentrated gas of heavy aromatic hydrocarbon is obtained, the concentrated gas is condensed to 3 ℃ through a condensation system, most of heavy aromatic hydrocarbon organic solvent is obtained through condensation, after the condensate is layered through a solvent separation system, an organic phase is conveyed out through a pump, filtered through a filter and then enters a liquid storage device; ④ Non-condensed gas which is not condensed in the condensing system enters a secondary particle active carbon adsorption and desorption system through an adsorption fan to carry out deep adsorption purification and secondary solvent recovery; ⑤ The clean gas which is effectively adsorbed and purified by the adsorption material of the secondary granular active carbon adsorption and desorption system is used as cooling/desorption wind of the primary rotary zeolite adsorption and concentration system, is led back to the inlet of a fan of the front deoxidation system, and is used as desorption wind after being reheated, so that a closed circulation system is formed; ⑥ And (3) carrying out steam desorption-condensation to recover the aromatic hydrocarbon solvent after the adsorption material of the secondary granular activated carbon adsorption and desorption system is saturated, and carrying out closed circulation drying, cooling and regeneration treatment on the granular activated carbon adsorption material and the inside of the system through a drying fan, a drying condensation system and a drying heater.
2. The method for treating the hydrogen peroxide oxidized tail gas according to claim 1, wherein the hydrogen peroxide oxidized tail gas is treated by a hydrogen peroxide oxidized tail gas treatment system, the hydrogen peroxide oxidized tail gas treatment system comprises a pretreatment system (1), a deoxidization system (2), a primary adsorption concentration system (3), a secondary adsorption and desorption system (4), a condensation system (5) and a solvent separation system (6), an outlet of the pretreatment system (1) is connected with the primary adsorption concentration system (3), the primary adsorption concentration system (3) is connected with the condensation system (5), and the condensation system (5) is connected with the solvent separation system (6) and the secondary adsorption and desorption system (4).
3. The method for treating hydrogen peroxide oxidized tail gas according to claim 1, wherein the first-stage adsorption concentration system (3) is provided with an adsorption zone, a cooling zone and a desorption zone in sequence.
4. The method for treating hydrogen peroxide oxidized tail gas according to claim 1, wherein the secondary adsorption and desorption system (4) comprises an adsorber A, an adsorber B and an adsorber C.
5. The method for treating hydrogen peroxide oxidized tail gas according to claim 1, wherein the pretreatment system comprises a gas-liquid separation device, a buffer tank and a wind collecting box.
6. The method for treating hydrogen peroxide oxidized tail gas according to claim 1, wherein the method is characterized in that the method comprises the steps of deoxidization and catalytic deoxidization and physical pressure swing adsorption deoxidization.
7. The method for treating hydrogen peroxide oxidized tail gas according to claim 1, wherein the first-stage adsorption concentration system (3) comprises an adsorption concentration device, a fan and a heater, and the adsorption concentration device is a rotary zeolite adsorption concentration device.
8. The method for treating hydrogen peroxide oxidized tail gas according to claim 2, wherein the hydrogen peroxide oxidized tail gas treatment system is formed by connecting a coalescer (1.1) and a buffer tank (2.1) through a pipeline, the outlet of the buffer tank (2.1) is connected with the inlet of a first-stage rotary zeolite adsorption concentration system (3), the first-stage rotary zeolite adsorption concentration system (3) is provided with an adsorption zone, a cooling zone and a desorption zone, the outlet of the adsorption zone is connected with a treatment fan (4.1) and then discharged to a chimney (5.1), the outlet of the cooling zone of the first-stage rotary zeolite adsorption concentration system (3) is connected with a purifying fan (6.1) and a heater (7) through pipelines, the outlet of the desorption zone is connected with a condenser (8), a phase separator (9) and a cooler (10) through pipelines in sequence, the outlet of the cooler (10) is connected with a layering tank (16), one side of the layering tank (16) is connected with an oil layer tank (17), the oil layer tank (17) is connected with a liquid storage device (18) after passing through a precise filter, the outlet of the first-stage rotary zeolite adsorption concentration system (3) is connected with the inlet of the adsorption fan (12) through a precise filter, the outlet of the layering tank (16) is connected with the adsorption system (12) through the inlet of the adsorption fan (11) through the pipeline, the outlet of the adsorption and desorption system (12) is connected with a drying condensing system (15), a drying fan (13) and a drying heater (14) through pipelines in sequence.

Description

Safe and efficient treatment method and system for hydrogen peroxide oxidized tail gas Technical Field The invention relates to a method and a system for treating hydrogen peroxide oxidized tail gas, which can safely and efficiently solve the problem of recycling aromatic hydrocarbon in the hydrogen peroxide oxidized tail gas with ultra-large air quantity. Background The oxidation production process in the organic chemical industry generally introduces air to react with organic matters, and oxygen is consumed by the reaction, so that the nitrogen content in the oxidation tail gas is higher, and meanwhile, the oxidation tail gas generally has the characteristics of high back pressure and containing reaction byproducts with complex components. The hydrogen peroxide oxidizing tail gas is generated by an oxidizing tower. After the compressed air enters the oxidation tower, oxygen and the hydrogenated liquid are subjected to oxidation reaction to be consumed, and the rest of gas is discharged as tail gas. Through calculation, 1t of hydrogen peroxide (27.5%) is produced, the oxidation exhaust emission is about 1380-1538 m < 3 >, and the oxidation exhaust flow is in direct proportion to the hydrogen peroxide scale. The main composition (volume ratio) of the hydrogen peroxide oxidation tail gas inlet is that nitrogen-containing gas is about 92-95%, oxygen-containing gas is about 5-8%, and heavy aromatic hydrocarbon with a certain concentration. Along with the increase of the scale of hydrogen peroxide in production enterprises, the air quantity of oxidized tail gas is larger and larger, and the air quantity is up to hundreds of thousands of cubic meters per hour. If the existing granular activated carbon adsorption recovery method is adopted for effective treatment of the hydrogen peroxide oxidized tail gas with the ultra-large air volume, the granular activated carbon treatment device is larger and larger, the bearing requirement on the roof is high, the occupied area is wasted, the investment, the energy consumption and the operation cost are increased, and the treatment efficiency is reduced. The process method (shown in figure 1) combining the primary adsorption concentration and the secondary adsorption and desorption has the advantages of saving the occupied area to a certain extent, reducing the roof bearing requirement, reducing the solvent recovery ton consumption and the cost and improving the treatment efficiency. However, because the hydrogen peroxide oxidized tail gas contains about 5-8% of oxygen, heavy aromatic hydrocarbon in the hydrogen peroxide oxidized tail gas is a flammable and explosive component, the concentration of aromatic hydrocarbon is increased after concentration, and under the working condition that 5-8% of oxygen exists, although the limiting oxygen concentration LOC of the heavy aromatic hydrocarbon (such as trimethylbenzene) is usually about 7% -9%, the mixed gas after concentration still is likely to enter an explosion triangle range, and for safety, the concentration of the gas after concentration is required to be not more than 25% of the explosion lower limit, so that the concentration ratio of the hydrogen peroxide oxidized tail gas with ultra-large air quantity is limited. The process system device combines primary adsorption concentration and secondary adsorption and desorption, pre-deoxidizes cooling air or desorption air in the primary adsorption concentration system, controls the oxygen content in a cooling or desorption unit entering the primary adsorption concentration system and a subsequent system to be lower than 3%, creates an absolute safe desorption environment, eliminates explosion risks from the source, enables the primary adsorption concentration multiplying power to approach the theoretical limit, maximizes the efficiency, enables clean gas after the effective adsorption and purification treatment of an adsorption material of the secondary adsorption and desorption system to serve as cooling/desorption air of the primary adsorption concentration system, is led back to a fan inlet of the pre-deoxidization system, is reheated and is used as desorption air to form a closed circulation system, greatly reduces the operation cost, and realizes near zero emission of VOCs and efficient recycling of resources, thereby maximizing the safety, efficiency maximization, economic maximization and environmental protection maximization. The utility model has the advantages of high concentration ratio, safety, high efficiency, floor area saving, roof bearing requirement reduction, solvent recovery ton consumption and cost reduction, treatment efficiency improvement and the like. The method for recovering the hydrogen peroxide tail gas heavy aromatic hydrocarbon commonly adopted in the early period in China comprises the processes of an ice maker method, a turbine expansion method, an active carbon fiber adsorption method and the like. The ice machine method is to direct