Technique for producing acetylene gas by dry method

Abstract

A process for producing ethyne by dry method is carried out by: mixing water with calcium acetylide powder in proportion of 1.1-1.9:1, and spraying water on calcium acetylide powders in ethyne generator and hydrolyzing to generate ethyne. Calcium acetylide rate at outlet of residual slag machine is 99.5-99.85 wt%, ethyne recovery rate reaches to 98.5 wt%, water content of calcium acetylide slag is 4-12 wt%, reactive temperature is set between 87-93 deg.C and water content is 75%. It's safe, continuous, simplified and cheap.

Description

technical field [0001] The invention relates to a process for producing acetylene gas by a dry method, which belongs to the technical field of chemical industry. Background technique [0002] At present, the domestic PVC production industry generally uses wet-process acetylene generators. Wet-process acetylene production uses more than 17 times the theoretical amount of water to decompose calcium carbide to generate acetylene gas. The calcium carbide slurry produced by this method has a water content of 90%, and the heat of reaction is taken away by the slurry water, causing a dissolution loss of nearly 1%, and every feeding needs to be replaced, which will drain the acetylene in the bucket and cause additional loss. Every ton of PVC produced will produce 15 tons of sewage containing a lot of sulfur and phosphorus, only a small part of which can be recycled. The calcium carbide slurry becomes a filter cake with a water content of about 35% after pressure filtration, and th...

AI Technical Summary

Problems solved by technology

The calcium carbide slurry produced by this method has a water content of 90%, and the heat of reaction is taken away by the slurry water, resulting in a dissolution loss of nearly 1%, and every feeding needs to be replaced, which will drain the acetylene in the bucket and cause additional loss

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