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Method for refining acetylene

An acetylene, first-line technology, applied in the field of removing high-grade alkynes, can solve the problems of solvent boiling point and flash point, low evaporation loss and entrainment loss, inability to realize industrialization, etc., and achieves easy operation and control of operating temperature and pressure, and high flash point. and the effect of mild boiling point, absorption and regeneration conditions

Active Publication Date: 2014-12-24
SINOPEC SICHUAN VINYLON FACTORY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the light components in the solvent are not cut, the boiling point and flash point of the solvent are low, and the evaporation loss and entrainment loss caused by the large flow rate of raw gas are serious, the loss of diesel oil for processing one ton of acetylene is as high as 19Kg, and industrialization cannot be realized.

Method used

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  • Method for refining acetylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Raw material air velocity 16h -1 , the pressure is 0MPa, the composition is 98.9603% of acetylene, 0.3105% of propadiene, 0.4515% of propyne, and 0.2726% of permanent gas; the absorption solvent is liquid paraffin with a boiling range of 185-250 °C, and the space velocity is 2.40 h -1 ; The absorption temperature of tower (3) is 15°C; the temperature of tower (7) is 25°C, the residence time is 3min; the temperature of tower (10) is 60°C, 5min; the temperature of tower (12) is 85°C, the residence time is 10min, the vacuum degree After the experimental device runs stably, analyzing the gas composition at the inlet and outlet of each tower shows that the product gas purity is 99.64%, the propadiene removal rate is 100%, the propyne removal rate is 99.96%, and the acetylene yield is 99.70%.

Embodiment 2

[0035] Raw material air velocity 20h -1, the pressure is 0.03MPa, the raw material composition is 98.8472% of acetylene, 0.3092% of propadiene, 0.4156% of propyne, and 0.4276% of permanent gas; the absorption solvent is reduced-line distillate oil with a boiling range of 320-400 ℃, and the space velocity is 2.25 h -1 ; The absorption temperature of tower 3 is 25°C; the temperature of tower 7 is 35°C and the residence time is 7min; the temperature of tower 10 is 80°C and the residence time is 10min; the temperature of tower 12 is 100°C and the residence time is 30min; After stable operation, analysis of the gas composition at the inlet and outlet of each tower shows that the purity of the product gas is 99.52%, the removal rate of propadiene is 99.8%, the removal rate of propyne is 99.94%, and the yield of acetylene is 99.98%.

Embodiment 3

[0037] Raw material air velocity 18h -1 , the pressure is 0.08MPa, the raw material composition is 98.7347% of acetylene, 0.3376% of propadiene, 0.4289% of propyne, and 0.4988% of permanent gas; the absorption solvent is ordinary second-line distillate oil with a boiling range of 200-260 °C, and the space velocity is 2.15 h -1 The absorption temperature of tower 3 is 18°C; the temperature of tower 7 is 28°C, the residence time is 5min, the temperature of tower 10 is 65°C, the residence time is 8min; the temperature of tower 12 is 88°C, the residence time is 15Min, and the vacuum degree is 35 KPa; After stable operation, analysis of the gas composition at the inlet and outlet of each tower shows that the purity of the product gas is 99.64%, the removal rate of propadiene is 100%, the removal rate of propyne is 100%, and the yield of acetylene is 99.92%.

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Abstract

The invention provides a method for refining acetylene, wherein a solvent is used for refining and removing impurities. The method is characterized in that the solvent is selected from one or more of liquid paraffin with the boiling range of 185-250 DEG C, distillate oil at vacuum side stream with the boiling range of 320-400 DEG C, distillate oil at second atmospheric side stream with the boiling range of 200-260 DEG C and distillate oil at first atmospheric side stream with the boiling range of 170-230 DEG C. The method provided by the invention is free from three-waste emission, and the DMY (dihydromyricetin) solvent in a solvent method can be recycled, so that the solvent is zero emission. The purity of recovered advanced alkyne is high and reaches over 99%, and the alkyne can be used as a fuel. The purity of acetylene purified is high, the content of impurities is lower than 0.05 %, and the loss of acetylene is low and is less than 0.5%.

Description

technical field [0001] The invention belongs to the field of chemical gas purification, in particular to a method for removing higher alkynes from natural gas acetylene. Background technique [0002] Natural gas acetylene refers to the acetylene gas produced by partial oxidation cracking of natural gas, and its purity is about 98.60%. Acetylene contains trace amounts of higher alkynes (AS) (mainly propadiene, propyne, butadiene, vinyl acetylene, diacetylene and C 6 + ) and CO 2 It needs to be removed, and the purity of acetylene reaches more than 99.50% to meet the requirements of organic synthesis products for raw materials. Among them, the higher alkynes (AS) and the saturated water contained in them are removed by absorption with 98% concentrated sulfuric acid, CO 2 Remove by alkaline washing. The spent sulfuric acid that has absorbed higher alkynes (AS) contains 8-15% organic matter and about 2% water, and has a brown or dark brown appearance and a strong pungent od...

Claims

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Application Information

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IPC IPC(8): C07C11/24C07C7/11
Inventor 胡建波唐晓东黎园李晶晶李小红
Owner SINOPEC SICHUAN VINYLON FACTORY
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