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Separation method of Fischer-Tropsch synthesis gas by combining rectification and solvent absorption

A Fischer-Tropsch synthesis and solvent absorption technology, applied in separation methods, absorption purification/separation, distillation purification/separation, etc., to achieve the effects of low investment and operating costs, high material recovery rate, and improved use value

Active Publication Date: 2009-10-21
WISON ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is higher than the recovery rate of the low-carbon hydrocarbon components of each of the above-mentioned patents, wherein the recovery rate of ethylene is 85%, which is much higher than the 30 to 50% ethylene recovery rate of CN1944358 and the 70% ethylene recovery rate of US4401450, but The recovery rate of ethylene in conventional hydrocarbon cracking equipment for ethylene production can reach over 98%. Therefore, if the ethylene content in the Fischer-Tropsch synthesis tail gas is relatively high, it is meaningful to further increase the recovery rate of ethylene.

Method used

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  • Separation method of Fischer-Tropsch synthesis gas by combining rectification and solvent absorption
  • Separation method of Fischer-Tropsch synthesis gas by combining rectification and solvent absorption
  • Separation method of Fischer-Tropsch synthesis gas by combining rectification and solvent absorption

Examples

Experimental program
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Effect test

Embodiment 1

[0041] as attached figure 1 As shown, the pretreated Fischer-Tropsch synthesis tail gas is used as feed, and its composition is shown in stream 101. Stream 101 passes through material heat exchanger L304, cooler E301, material heat exchanger L303 and cooler E302 to reduce the temperature to about -75°C and then enters demethanizer T301 to remove methane and lighter components therein. The top discharge of the demethanizer T301 is sent to the absorption tower T302, and the absorbent (stream 114) is injected into the top of the tower to reduce the content of carbon 2 and heavier components therein. The composition of the bottom liquid of the demethanizer is shown in stream 102, so it can be seen that the concentration of light hydrocarbons in the feed is increased by 5 to 6 times. The cooling and condensation of the above-mentioned feed gas uses the cooling capacity provided by the propylene refrigeration compressor and the ethylene refrigeration compressor in addition to the h...

Embodiment 2

[0050] as attached figure 2 As shown, from the material inlet to the demethanizer, the absorption tower, the first and second gas-liquid separation tanks, and finally to the desorption tower, all the processes are the same as in Example 1, except that the absorbent used in this example is Propane, from the bottom material of the propylene rectification tower T403, is cooled by the coolers E401 and E402 and then enters the absorption tower T302 as an absorbent. See logistics table 2 for the material balance calculation results.

[0051] Embodiment 2 logistics table Mol%

[0052] tracking number

Embodiment 3

[0054] as attached image 3 As shown, from material import to demethanizer, absorption tower, first and second gas-liquid separation tank, finally to desorption tower, all flow processes are all the same as embodiment 1, and the difference is that the absorbent used in this embodiment is The bottom material from the depropanizer T501 is cooled by the coolers E401 and E402 and then enters the absorption tower T302 as an absorbent. See logistics table 3 for material balance calculation results.

[0055] Logistics Table 3 Mol%.

[0056] tracking number

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Abstract

The invention relates to a separation method of Fischer-Tropsch synthesis gas by combining rectification and solvent absorption. The separation method comprises the following steps: Fischer-Tropsch synthesis gas pretreated is conveyed to a demethanizer after being cooled; the top of the demethanizer separates hydrogen and other light gas, methane, part of C2 fraction and little amount of C3; the mixed gas enters an absorption tower and uses C3, C4 or C5 or hydrocarbon mixture as an absorbing agent to absorb C2 and heavier components; the products of the top of the absorption tower comprise hydrogen and other light gas, methane, the little balanced amount of C2 and the absorbing agent; the products of the bottom of the tower are components above C2 and little amount of hydrogen and methane; the materials are conveyed to the demethanizer for further absorbing C2 and heavier fraction and removing the methane and lighter components therein. The light hydrocarbon mixture of the bottom of the demethanizer can adopt conventional light hydrocarbon separation method to separate out various light hydrocarbon products with needed purity and recycling rate. Compared with the prior art, the invention has the advantages of simple process, low energy consumption and high recycling rate of various components and the like.

Description

Technical field: [0001] The invention belongs to the technical field of light hydrocarbon separation, in particular to a method for recovering H from Fischer-Tropsch synthesis tail gas 2 , CO and low carbon hydrocarbon components. Background technique [0002] Fischer-Tropsch synthesis refers to the conversion of synthesis gas on catalysts such as iron, cobalt, nickel or ruthenium to produce hydrocarbons (Fischer-Tropsch synthesis, referred to as FTS). Fischer-Tropsch synthesis products include low-carbon hydrocarbons (C1-C5 alkanes) , liquid hydrocarbons (C5-C20 hydrocarbons), solid products (C20+ hydrocarbons), water, carbon dioxide and oxygen-containing compounds (aldol ketoesters), etc. Fischer-Tropsch synthesis products are separated to form cryogenic condensate (liquid hydrocarbons), solid wax, waste water and a gas mixture containing unreacted H 2 , CO and CO 2 , low-carbon hydrocarbons (methane, ethane / ethylene, propane / propylene, butane / butene) and a small amount...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/72C07C1/04C07C7/04C07C7/11C07C11/04
CPCF25J3/0219F25J3/0233F25J3/0252F25J2200/78F25J2205/50F25J2210/12F25J2270/04Y02P30/40
Inventor 倪进方吕建宁丁干红
Owner WISON ENG
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