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A low energy consumption PTA oxidation tail gas catalytic combustion treatment method
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A technology of catalytic combustion and oxidation of tail gas, applied in the combustion method, combustion type, incinerator, etc., can solve the problems of high material requirements of the expander, large loss of recovered energy, large airflow wave resistance, etc. Large, the effect of easing operating conditions
Active Publication Date: 2017-10-17
NANJING POLYTECHNIC INSITUTE
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However, there are disadvantages in this catalytic combustion process: first, the energy consumption is relatively high, and it needs to consume more fuel methanol, about 13.5kg / tPTA
The second is that the inlet temperature of the exhaust expander is relatively high (450°C). The expander operates at a high temperature of 450°C, which requires high material requirements for the expander. Moreover, the airflow wave resistance encountered by the exhaust expander when it does work at high temperature is large. When recovering energy Greater loss
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Embodiment 1
[0025] The production capacity of a certain PTA plant is 600 kt / a, and the operating conditions of the PX oxidation reactor are reaction temperature 194-200 °C, pressure 1.4-1.6 MPa; the oxidation tail gas is washed by a high-pressure absorption tower, p-xylene and methyl acetate are recovered, and the gas After liquid separation, the tail gas enters the High Pressure Catalytic Combustion System (HPCCU). The oxidation tail gas composition (wt %) before catalytic combustion treatment is as follows:
[0026] N 2 (92.85%), O 2 (3.98%), CO 2 (2.16%), H 2 O(0.37%),CO(0.51%),CH 3 Br (0.0077 %), other organic matter (0.1 %); oxidation tail gas flow rate 2639 kg / tPTA.
[0027] The specific steps of the improved catalytic combustion process are as follows:
[0028] (1) The oxidized tail gas from the high-pressure absorption tower enters the catalytic combustion preheater, the first preheater uses low-pressure steam to heat it to 130°C, and the second preheater uses high-pressure ...
Embodiment 2
[0040] The production capacity of a certain PTA plant is 600 kt / a, and the operating conditions of the PX oxidation reactor are reaction temperature 194-200 °C, pressure 1.4-1.6 MPa; the oxidation tail gas is washed by a high-pressure absorption tower, p-xylene and methyl acetate are recovered, and the gas After liquid separation, the tail gas enters the High Pressure Catalytic Combustion System (HPCCU). The oxidation tail gas composition (wt %) before catalytic combustion treatment is as follows:
[0041] N 2 (92.9%), O 2 (3.96%), CO 2 (2.15%), H 2 O(0.37%),CO(0.51%),CH 3 Br (0.0078 %), the remaining organic matter (0.1 %); the flow rate of oxidation tail gas is 2598 kg / tPTA.
[0042] The specific steps of the improved catalytic combustion process are as follows:
[0043] (1) The oxidized tail gas from the high-pressure absorption tower enters the catalytic combustion preheater, the first preheater uses low-pressure steam to heat it to 130°C, and the second preheater us...
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Abstract
The invention discloses a PTA (purified terephthalio acid) oxidized tail gas catalytic combustion processing method with low energy consumption. Oxidized tail gas from a high-pressure absorbing tower enters a catalytic combustion pre-heater and is heated to 295-300 DEG C, and then is mixed fully with assistant fuel methanol and fed into a combustion reactor, wherein the addition of methanol is 6.5-7.0kg / t PTA, the operation pressure of the catalyst combustor is 1.0-1.2MPa, the gas inlet temperature is 295-300 DEG C, and the normal outlet temperature is 395-405 DEG C. Through catalytic combustion reaction, a small amount of organic matter and CO in the oxidized tail gas is combusted to generate CO2 and H2O, and methyl bromide is converted to bromide and hydrogen bromide. Most part of gas from the catalyst combustor enters into a tail gas expanding machine to act to recover energy. The gas inlet temperature of the tail gas expanding machine is 395-405 DEG C, the inlet pressure is 1.0-1.2MPa, the gas outlet temperature is 105-115 DEG C and the outlet pressure is 0.1MPa. The tail gas outputted from the expanding machine is washed with alkali by a tail gas washing tower to remove HBr and Br2, and then is exhausted into air after reaching an environmental protection emission standard. Compared with an existing HPCCU technology, the mechanical consumption amount is reduced by 6.5-7.0kg / tPTA, the methanol consumption amount is reduced by about 50%, the energy consumption of the catalytic combustion system is reduced significantly, the processed tail gas reaches the environment emission standard, and the economic benefits are significant.
Description
technical field [0001] The invention relates to a method for catalytic combustion of PTA oxidation tail gas with low energy consumption. The tail gas comes from the oxidation section of a purified terephthalic acid (PTA) production device, and belongs to the technical field of chemical production technology. Background technique [0002] Purified Terephthalic Acid (PTA) is a raw material for the production of polyester, mainly used in the production of ethylene terephthalate (PET). PTA is currently mainly produced by the air oxidation method of p-xylene (P-Xylene, referred to as PX). A typical production process consists of two parts: a PX oxidation unit and a TA hydrorefining unit. The raw material p-xylene (PX) is dissolved in acetic acid-water solvent, cobalt acetate / manganese acetate / hydrogen bromide is used as the catalyst, PX and oxygen in the air are oxidized in the oxidation reactor, and the reaction temperature is 191-201°C. The pressure is 1.25-1.65 MPa to generat...
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