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Method for extracting isobutane, isobutene and hydrogen rich gas from chemical tail gas
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A technology of isobutane isobutene, chemical tail gas, applied in chemical instruments and methods, hydrogen separation, organic chemistry, etc.
Inactive Publication Date: 2016-08-24
朱琳
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However, most of the isobutane in my country's catalytic cracking petroleum gas is used as civil liquefied petroleum gas fuel, while the amount
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Embodiment 1
[0024] Embodiment 1, extracting isobutane isobutene and hydrogen-rich gas from chemical tail gas
[0025] The main components of raw material gas are isobutane 41% (m%), isobutene 24% (m%), water 31% (m%), and also contain a small amount of CH4, C2H6, C3H8, H 2 and CO 2 . Such as figure 1 As shown, the method of the present embodiment is as follows:
[0026] 1) First-stage gas-liquid separation: After the raw material gas is compressed and cooled, the temperature is 40°C and the pressure is 0.5MPa, and it enters the first-stage gas-liquid separation tank for raw material gas, and the liquid phase and gas phase are obtained by gas-liquid separation. The water in the raw material gas The system is separated in a liquid state. After testing, the water does not contain isobutane and isobutene, and the water content in the gas phase is 1.5% (m%).
[0027] 2) Decarburization: Step 1) The gas phase generated by gas-liquid separation then enters the decarburization process, using ...
Embodiment 2
[0031] Example 2, Extracting isobutane isobutene and hydrogen-rich gas from chemical tail gas
[0032] The difference between embodiment 2 and embodiment 1 is:
[0033] The main components of the feed gas are isobutane 44% (m%), isobutene 17% (m%), water 37% (m%), and a small amount of H 2 , CO 2 . The raw material gas is cooled from 97°C to 40°C, and then enters the pre-separator (gas-liquid separator) for gas-liquid separation, reducing the water content to 4% (m%), and then enters the Raw gas primary separation tank. The schematic diagram of the process is as figure 2 shown.
[0034] In this embodiment, the main components of the liquid phase separated from the liquid phase obtained by the second-stage gas-liquid separation are isobutane and isobutene, while containing a small amount of water, and sent to the product storage tank.
[0035] In the third-stage gas-liquid separation tank, hydrogen-rich gas with a purity of 96% is obtained at the top of the tank, and a l...
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Abstract
The invention discloses a method for extracting isobutane, isobutene and hydrogen rich gas from chemical tail gas. The method comprises the steps of firstly carrying out pressure cooling on raw gas to separate most of water, carrying out decarburization to ensure that a product does not contain CO2, carrying out further pressure cooling to separate most of isobutene and isobutene in a liquid state manner, carrying out dehydration on unseparated gas, introducing gas meeting copious cooling liquidation separation into a main heat exchanger, carrying out copious cooling separation, extracting hydrogen rich gas from the top of a separator in a gas state manner to obtain liquid isobutene and liquid isobutene at the bottom, and respectively conveying liquid isobutene and liquid isobutene to product storage tanks. The method has the main advantages that CO2 is firstly separated by virtue of sequential pressure cooling, oil removal and decarburization, so that the liquid isobutene product and the liquid isobutene product do not contain CO2; separated water does not contain liquid isobutene and liquid isobutene, and the extraction rates of the products are high; the hydrogen content in hydrogen rich gas is 98% or above; and the flow is simple, the operation is easy, and the energy consumption is low.
Description
technical field [0001] The invention relates to the field of gas separation technology, in particular to a method for extracting isobutane, isobutene and hydrogen-rich gas by using chemical tail gas as raw material. Background technique [0002] Isobutane and isobutene mainly come from refinery catalytic cracking and ethylene by-product C4 fraction. There are four main ways for the chemical utilization of isobutane: alkylation for the production of alkylated gasoline; dehydrogenation to produce isobutene; steam cracking to produce ethylene propylene, etc.; isobutane and propylene co-oxidation to produce propylene oxide co-production tert-butanol. At present, most of the domestic isobutane is directly used as civil fuel, and the rest is used for alkylation to produce alkylated gasoline and as a refrigerant for refrigerators and freezers. The utilization of isobutane in my country is still in its infancy. Isobutene is an important organic chemical raw material, mainly used i...
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