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Methyl aromatic hydrocarbon liquid phase oxidation esterification tail gas absorption technology

A technology of methyl aromatic hydrocarbons and oxidative esterification, applied in chemical instruments and methods, dispersed particle separation, separation methods, etc., can solve the problems of expensive ionic liquids, difficult separation of ionic liquids and adsorbed organics, etc.

Inactive Publication Date: 2016-12-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, in Chinese patent CN 102091498 A, it provides a technology for absorbing oxidized tail gas with ionic liquid, but the ionic liquid is expensive, and the separation of ionic liquid and adsorbed organic matter is difficult

Method used

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  • Methyl aromatic hydrocarbon liquid phase oxidation esterification tail gas absorption technology
  • Methyl aromatic hydrocarbon liquid phase oxidation esterification tail gas absorption technology
  • Methyl aromatic hydrocarbon liquid phase oxidation esterification tail gas absorption technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1 The treatment technology of o-xylene oxidation reaction tail gas

[0021] Table 1: Components of o-xylene oxidation reaction tail gas before treatment

[0022]

[0023] Such as figure 1 As shown, the tail gas produced by the oxidation of o-xylene enters the spray tower through the inlet 1, the composition is shown in Table 1, and the intake flow rate is 7140Nm 3 / hr, the intake temperature of the exhaust gas is 125°C, the absorbent methyl o-toluate enters the spray tower through the spray pipe 3, and is sprayed by the spray head to carry out reverse contact with the exhaust gas, the methyl o-toluate The spraying flow rate is 2450L / h. After absorbing and treating the tail gas, it finally flows out from the outlet 4. The components of the absorbed tail gas are shown in Table 2. The organic components are greatly reduced, and the temperature of the tail gas is lowered. The main components are shown in Table 2.

[0024] Table 2: Components of tail gas afte...

Embodiment 2

[0026] Embodiment 2: the treatment technology of p-xylene oxidation tail gas

[0027] The main components of the tail gas from the oxidation of p-xylene are shown in Table 3.

[0028] Table 3: Components of p-xylene oxidation reaction tail gas before treatment

[0029]

[0030] Such as figure 1 As shown, the tail gas produced by the oxidation of p-xylene passes through the inlet 1 and enters the spray tower. The composition is shown in Table 3, and the intake flow rate is 11140Nm 3 / hr, the intake temperature of the tail gas is 156°C, the absorbent diethyl terephthalate enters the spray tower through the spray pipe 3, and is sprayed by the spray head to carry out reverse contact with the tail gas, the methyl o-toluate The spraying flow rate is 4450L / h. After the tail gas is absorbed and treated, it finally flows out from the outlet 4. The components of the absorbed tail gas are shown in Table 4. The organic components are greatly reduced, and the temperature of the tail g...

Embodiment 3

[0033] Example 3: Treatment technology for tail gas from oxidation reaction of 1,3,5-trimethylbenzene

[0034] The main components of the tail gas from the oxidative esterification of 1,3,5-trimethylbenzene are shown in Table 5.

[0035] Table 5: Composition of 1,3,5-trimethylbenzene oxidation tail gas before treatment

[0036]

[0037] Such as figure 2 As shown, the tail gas produced by the oxidative esterification of 1,3,5-trimethylbenzene enters the packed absorption tower equipped with Raschig ring packing through the inlet 1. The composition of the tail gas is shown in Table 5. The upper part of the tower is injected into 1,3 through the liquid distributor , the mixture (volume fraction 3:2) of 5-trimethylbenzene oxidation esterification product 3,5-dimethyl benzoate and 3-methyl phthalate dimethyl ester is used as absorbent, and the flow rate of absorbent is 1450L / h, after the tail gas is absorbed and treated, it finally flows out from the outlet 4. The components ...

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Abstract

The invention discloses a methyl aromatic hydrocarbon liquid phase oxidation reaction tail gas treatment technology, which is specifically suitable for tail gas absorption treatment of liquid phase oxidation esterification reactions of toluene, xylene, trimethyl benzene and other methyl aromatic hydrocarbons. According to the present invention, an aromatic hydrocarbon oxidation esterification product is adopted as an absorber, and a tail gas flow contacts the esterification product, such that the oxidation tail gas is cooled, and the organic matters in the tail gas are adsorbed, recovered and utilized so as to achieve the standard discharge of the tail gas; after the esterification product absorbs the organic matters in the tail gas, the obtained esterification product can directly enter the reaction tower to react again without the separation device so as to substantially simplify the process; and compared to the traditional aromatic hydrocarbon liquid phase oxidation tail gas technology, the tail gas absorption technology of the present invention has advantages of simple process, low running cost, high removal rate of organic matters in the tail gas, and the like.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and in particular relates to a treatment technology for tail gas of methyl aromatic hydrocarbon liquid phase oxidation reaction. Background technique [0002] In the oxidation process of methyl aromatic hydrocarbons, due to the high reaction temperature, there are usually a lot of unreacted substrates and partially oxidized products in the tail gas of the reaction. On the one hand, this part of organic matter pollutes the atmosphere, on the other hand, it will reduce the yield of the reaction and bring economic losses. The traditional tail gas treatment method is complex in process, and the process of re-reacting the separated products after post-treatment is cumbersome. [0003] Early processes for treating tail gas from oxidation reactions include catalytic combustion, solid adsorption, lye washing and so on. For example, in Chinese patent CN 103816764 A, it discloses a method of using c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
Inventor 徐杰高进孙颖苗虹石松黄义争
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI