Method for preparing hydrogen peroxide by using naphtha cracking tail gas

Abstract

The invention discloses a method for producing hydrogen peroxide with the naphtha cracking off-gas, which includes the following steps: 1.Light oil and liquid ammonia gasified are fed into a blender according to the weight ratio of 1:3-3.3, then the mixture is fed into a cracking furnace containing refinery coke catalyzer for scission reaction; 2. The deamination of the cracking outcome is carried out and then the the cracking outcome is absorbed by cold water and divided into liquid phase and gas phase, wherein, the liquid phase is resolved into finished product of hydrocyanic acid, the gas phase will be treated in the next step; 3. The gas phase generated in the step 2 is treated by alkaline washing and purified by membrane separation to collect the hydrogen gas; 4. The hydrogen gas collected in the step 3 is fed into a hydrogen peroxide production device as the hydrogen source, then the hydrogen peroxide can be obtained after the hydrogenation, oxygenation, extraction, purification and concentration. The invention can avoid waste of resources, reduce air pollution and can reduce the manufacturing cost of the product at the same time.

Description

technical field [0001] The invention relates to a method for preparing hydrogen peroxide, in particular to a method for preparing hydrogen peroxide by utilizing tail gas in a light oil cracking process. Background technique [0002] The preparation of hydrocyanic acid and its salts by light oil cracking is a production process often used by domestic enterprises. The raw materials used in this method are light oil, liquid ammonia and petroleum coke. The process flow is usually: liquid ammonia is gasified by a gasifier, mixed with light oil and petroleum coke, and then enters a cracking furnace. Petroleum coke is used as a catalytic carrier, and the raw material gas Cracking occurs under the action of high temperature and slight negative pressure to generate hydrocyanic acid and a large amount of tail gas. At present, the tail gas produced by light oil cracking method is usually discharged directly or used as boiler fuel. Because the tail gas produced by this method contains...

AI Technical Summary

Problems solved by technology

Because the tail gas produced by this method contains a large amount of hydrogen and a small amount of nitrogen and carbon powder, the above method not only causes serious waste of resources, but also causes environmental pollution

The existing hydrogen peroxide manufacturing process needs to consume a large amount of hydrogen

At present, industrial methods for large-scale production of hydrogen peroxide, such as anthraquinone method, heavy aromatic hydrocarbon method, and trioctyl phosphate method, all require pre-prepared working fluid, and the working fluid is then processed to obtain hydrogen through hydrogenation and other processes, so its manufacturing cost is high.

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