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Technique for purifying acetylene gas with sulfuric acid and application thereof

A technology for acetylene gas and sulfuric acid, applied in absorption purification/separation, hydrogen halide addition preparation, organic chemistry, etc., can solve problems such as ignoring the water absorption of concentrated sulfuric acid, and achieve the effect of reducing equipment investment and operating costs

Active Publication Date: 2012-12-19
CHINA TIANCHEN ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] This process only utilizes the strong oxidizing property of concentrated sulfuric acid, while ignoring the water absorption of concentrated sulfuric acid

Method used

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  • Technique for purifying acetylene gas with sulfuric acid and application thereof
  • Technique for purifying acetylene gas with sulfuric acid and application thereof

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Embodiment Construction

[0023] Taking acetylene gas as an example in the vinyl chloride synthesis process, the technical solution of the present invention will be described in detail below.

[0024] The traditional process of cleaning acetylene gas with sulfuric acid such as figure 1 As shown, the acetylene gas compressed by the acetylene compressor at a temperature of 40°C and containing saturated water vapor first enters the second washing tower 11 and is cooled to 20°C, and then enters the two-stage sulfuric acid cleaning tower: the sulfuric acid washing tower 12 and the sulfuric acid cleaning tower 13 , after removing the sulfur and phosphorus therein, it enters the alkali washing tower 14 for alkali washing; after that, the acetylene gas is cooled to 15°C in the acetylene cooler 15 with 5°C water, and then enters the acetylene demister 16, and is sent to the conversion section after demisting. In the conversion section, after mixing with hydrogen chloride gas at a temperature of 15°C in the mixe...

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Abstract

The invention relates to a technique for purifying acetylene gas with sulfuric acid and application thereof. An alkali cleaning cooling tower and a sulfuric acid purification tower are connected sequentially; the alkali cleaning cooling tower is moved before the sulfuric acid purification tower; and the sulfuric acid purification tower is formed by connecting two towers in series, wherein the primary tower is a packing tower, and the secondary tower is a packing / bubbling hood combined tower. The technique for purifying acetylene gas with sulfuric acid is suitable for technical processes for purifying and drying acetylene, and especially synthesis techniques of vinyl chloride. In the acetylene gas purification process, the acetylene gas is dried, and the drying effect is better than that of mixed freeze drying, thereby reducing the occurrence of side reaction and being beneficial to the proceeding of the synthetic reaction; and meanwhile, the invention can reduce the equipment investment and the consumption of freezing water or freezing salt water, thereby lowering the operating cost.

Description

technical field [0001] The invention relates to a process for cleaning acetylene gas, in particular to a process for cleaning acetylene gas with sulfuric acid and its application. Background technique [0002] Because calcium carbide contains impurities, the crude acetylene produced after calcium carbide hydrolysis contains a small amount of sulfur and phosphorus impurities. If they are not removed and brought into the conversion section, the decline in catalyst activity will be accelerated. Therefore, it is necessary to select a suitable oxidant to remove sulfur and phosphorus. . [0003] In some chemical processes using acetylene, it is also required that the water content of acetylene gas should be as low as possible. For example, in the synthesis of vinyl chloride, the water content in acetylene gas and hydrogen chloride should be controlled as low as possible. There is water in the raw material gas, which is easy to dissolve and form hydrogen chloride. Hydrochloric aci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/24C07C7/11C07C21/06C07C17/08
Inventor 谢蕊严永华方凤岭李荣杨克俭程鹏许景洋梁军湘
Owner CHINA TIANCHEN ENG
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